Oxidative Medicine and Cellular Longevity

Oxidative Medicine and Cellular Longevity / 2021 / Article
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Molecular Mechanisms of Dietary Bioactive Compounds in Redox Balance and Metabolic Disorders

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Volume 2021 |Article ID 8852759 | https://doi.org/10.1155/2021/8852759

Liling Deng, Chenzhen Du, Peiyang Song, Tianyi Chen, Shunli Rui, David G. Armstrong, Wuquan Deng, "The Role of Oxidative Stress and Antioxidants in Diabetic Wound Healing", Oxidative Medicine and Cellular Longevity, vol. 2021, Article ID 8852759, 11 pages, 2021. https://doi.org/10.1155/2021/8852759

The Role of Oxidative Stress and Antioxidants in Diabetic Wound Healing

Academic Editor: Alin Ciobica
Received12 Oct 2020
Accepted29 Dec 2020
Published08 Feb 2021

Abstract

Foot ulcers are one of the most common and severe complication of diabetes mellitus with significant resultant morbidity and mortality. Multiple factors impair wound healing include skin injury, diabetic neuropathy, ischemia, infection, inadequate glycemic control, poor nutritional status, and severe morbidity. It is currently believed that oxidative stress plays a vital role in diabetic wound healing. An imbalance of free radicals and antioxidants in the body results in overproduction of reactive oxygen species which lead to cell, tissue damage, and delayed wound healing. Therefore, decreasing ROS levels through antioxidative systems may reduce oxidative stress-induced damage to improve healing. In this context, we provide an update on the role of oxidative stress and antioxidants in diabetic wound healing through following four perspectives. We then discuss several therapeutic strategies especially dietary bioactive compounds by targeting oxidative stress to improve wounds healing.

1. Introduction

Diabetes mellitus (DM) and its complications are increasingly prevalent worldwide with a serious burden on patients and health care systems [1] Diabetic foot ulcers have a substantial impact on disability, morbidity, and mortality. The mechanism of diabetic wound chronicity has not been well understood. It is currently believed that oxidative stress plays a vital role in the occurrence and development of diabetic wound [2, 3]. Oxidative stress is caused by overproduction of reactive oxygen species and insufficient antioxidant systems. However, the process of oxidative stress in wound development and healing remains unclear. This review will further develop the discussion on how oxidative stress may affect diabetic wound healing in terms of skin injury, neuropathy, arterial disease, and infection. Furthermore, the plausible role of antioxidants including plant bioactive compounds on promoting wound healing will be addressed in order to explore novel approaches and strategies for promotion of diabetic wound healing.

2. Oxidative Stress State in the Development and Healing of Diabetic Wound

Reactive oxygen species (ROS) are crucial regulators of several phases of wound healing. Indeed, low levels of ROS are required for the fight against external damage [4]. However, excessive oxidative stress on tissues and the decrease of antioxidant ability results in redox imbalance, which is a major cause of nonhealing diabetic wounds [5]. Clinical studies investigated that nonhealing diabetic wounds are infiltrated by the highly oxidizing environment, which is associated with hyperglycemia and tissue hypoxia, that leads to delayed wound repair. People with long-term type 2 diabetes have significant reductions in the antioxidant enzyme activity [6]. Oxidative stress may influence diabetic wound healing through skin injury, neuropathy, ischemic lesion, and topical infection (Figure 1).

2.1. Diabetic Skin Injury

The repair process of diabetic skin injury includes the temporally overlapping stages of coagulation, inflammation, migration-proliferation, and remodeling [7].While the molecular mechanisms underlying such defects have not yet been clarified, some have reported that a hyperglycemic state directly affects the keratinocyte and fibroblast activity inducing changes in protein synthesis, proliferation, and migration, reduced antimicrobial peptide expression, and increased oxidative stress. These myriad changes may result in the injury of the skin barrier function making the skin susceptible to damage and infection [811]. A balanced redox state is likely critical for prompt healing. Diabetic skin appears to be infiltrated with more inflammatory cells, edema, and less granulation tissue formation than the normal skin, suggesting a deterioration in diabetic ulcer healing reserve [2, 7].Additionally, the periwound and central wound tissue in people with diabetes appears to also be more likely to be prone to excessive oxidative stress and damage, which results in poor healing [12, 13]. Kim et al. suggested that both high oxidative stress levels and bacteria set the wound up for chronic wound development [14].

Experiments that have evaluated hypoxia and oxidative stress suggest that they may lead to the downregulation of miRNA biogenesis genes in cultured fibroblasts [15]. Recent efforts have indicated the levels of serum advanced glycation end product (AGE), and its epidermal receptors were elevated in diabetes [9, 16]. AGEs bind to receptors on the endothelial cell surface inducing the overproduction of ROS [17]. AGE in the diabetic wound microenvironment appears to impair wound contraction and prolongs the inflammatory response and appears to deleteriously damage extracellular matrix (ECM) proliferation [18]. Nrf2 is a key transcription factor involved in wound healing by regulating angiogenesis and antioxidant gene expression, which is impaired in diabetes [19, 20]. A recent study indicates that activation of Nrf2 signaling significantly increased TGF-β1 and reduced MMP9 in keratinocytes in diabetic wound healing [12]. Another study reported that SIRT1 (silent mating information regulation 2 homolog) activation could protect vascular endothelial cells from oxidative stress damage to improve angiogenesis in wounds to accelerate wound healing in diabetic mice, and this effect may be through the AKT-Nrf2 pathway [21]. Sirtuins are class III histone deacetylase enzymes which are evolutionarily conserved and possess NAD + dependent deacetylase activity. Sirtuin 3 (SIRT3) is a protein deacetylase located in the mitochondria. It serves to regulate the mitochondrial function, which is involved in regulating cellular redox status, mitochondrial energetics, biogenesis, dynamics, and apoptosis. Recent work has demonstrated that the lack of SIRT3 reduced blood supply, inhibited vascular endothelial growth factor (VEGF) expression, promoted superoxide production, impaired total antioxidant capacity, and consequently resulted in delayed skin wound healing in diabetic mice [22]. Therefore, sirtuins may be a new therapeutic target to improve diabetic wound healing.

2.2. Diabetic Neuropathy

At least half of the people with diabetes will develop clinically significant peripheral neuropathy [2325]. Sensory nerve dysfunction leads to the loss or weakening of skin protection. Motor neuropathy, which increases plantar pressure that directly destroys the tissue, causes plantar capillary occlusion, local tissue ischemia, and destruction [26]. The autonomic neuropathy of sweat glands in people with diabetes leads to reduced skin sweating, abnormal temperature regulation, and dry and chapped skin, which in turn damages the integrity of the skin, leading to a reduced barrier to infection. It also leads to perturbations in the skin blood flow and microcirculatory disorders such as loss of peripheral sympathetic nerve innervation and tension, leading to vasomotor dysfunction and abnormal arteriovenous shunting. As a result, the abnormal blood flow distribution and nutritional capillary ischemia could occur.

It has been well demonstrated that hyperglycemia is a critical mechanism in the induction of oxidative stress. Increased oxidative stress appears to deleteriously affect blood supply, structure, and metabolism of the peripheral nerve [26] that leads to extensive deterioration to the all aspects of the peripheral nervous system including Schwann cells, myelinated axons, and sensory neurons located in the dorsal root ganglia [27]. Meanwhile, insufficient ATP supplies could lose the ability to transport axons, as axons were rich in mitochondria, providing direct nerve energy supply, thereby further promoting axonal injury, causing diabetic neuropathy. The loss of ability of detoxify the excess oxidative stress with insufficient ATP supplies led the axons oxidative stress damage in hyperglycemia, which precipitated axonal degeneration or apoptosis [28]. Studies have suggested that multiple biochemical pathways are deleteriously affected by oxidative stress (Figure 2).


DrugsObservationMechanismReference

Antimetabolism imbalanceMetforminImproved angiogenic functions of ECs and EPCsNO, AMPK/mTOR pathway[72, 73]
SGLT2iImprove inflammation and endothelial functionLower mRNA expression of TNF-α, IL-6, and MCP-1[7476]
DDP-4iAntioxidative stressNrf2 pathway[77, 78]
FenofibratesImprove skin barrierWnt/β-catenin pathway[79, 80]
StatinsPromote angiogenesis and lymphangiogenesisPI3-kinase/Akt pathway[8183]

Therapy for diabetic neuropathyALAAntioxidative stressInhibition of NF-κB[64, 84, 85]
Aldose reductase inhibitorsAntioxidative stressPolyol pathway[31]
Coenzyme Q10Ameliorates oxidant stress and apoptosisIncreasing energy generation of ATP[86, 87]

Therapy for diabetic angiopathiesCilostazolAntiatherosclerosis[88]
Low molecular-weight heparinIncrease microcirculationAnticoagulation[8991]
IloprostImprove limb perfusion/[92]

Therapy for the diabetic skinEGFAntioxidative stress/[94]
Biogenic AgNPsAccelerate wound healingInhibit overexpression of MMP-2 and MMP-9, antimicrobial[95]
NaBAccelerate wound healingAntimicrobial activity and improve proliferation[96]

Therapy for infectionAntibioticsFight against for infection/[97, 98]

Plant ingredients for OSFerulic acidAntioxidative stressReduce MMP (2, 8, 9) and increase TIMP-1 and 2[99, 100]
Chlorogenic acidAntioxidative stressElevate the level of reduced glutathione[102]

Potential antioxidantsThe drug-loaded ROS-scavenging hydrogelAccelerate wound healingDecrease ROS level and upregulate M2 phenotype macrophages[103]
DeferoxaminePromote neovascularization and regenerationSuppress OS and activate hypoxia-inducible factor-1 alpha ion[104]
Propolis/Increase GSH/GSSG) ratio[108]
N-Acetyl cysteine (NAC)Accelerate wound healingAccelerate wound healing[109, 110]

2.2.1. Activated Polyol Pathway

The polyol pathway mainly includes the conversion of glucose to sorbitol by aldose reductase (AR) and the conversion of sorbitol to fructose by sorbitol dehydrogenase. In patients with diabetes, elevated intracellular levels of glucose cause the affinity of AR for glucose to also increase. This then leads to the increased production of sorbitol. Subsequent accumulation of sorbitol reduces the activity of Na+K+-ATPase which reduces the physiological reserve of nerve cells and commensurate reduction of nerve conduction velocity. It is also understood that the hyperglycemia-induced polyol pathway leads to increased oxidative stress because of depletion of NADPH, which is derived from the pentose phosphate pathway that generates GSH from glutathione. Meanwhile, excess fructose, as a product in metabolism, accelerates glycation and further consumption of NADPH to aggravate intracellular oxidative stress [29]. It has been confirmed in diabetic mice with high expression of aldose reductase. Diabetic mouse models indicate that sorbitol accumulates significantly in the sciatic nerve of diabetic AR+/+ mice. Traces of oxidative stress and DNA damage in the sciatic nerve were additionally observed [30]. Until now, aldose reductase inhibitors have been used to inhibit oxidative stress through the polyol pathway [31]. This may be beneficial for improving diabetic ulcer with concomitant neuropathy.

2.2.2. Activated Hexosamine Pathway

In an environment characterized by hyperglycemia, fructose-6 phosphate, a metabolic intermediate of glycolysis, is shifted from the glycolytic pathway to the hexosamine pathway and then converted to uridine diphosphate N-acetylglucosamine (UDPGlcNAc). Subsequently, UDPGlcNAc attaches to the serine and threonine residues of transcription factors [32].

Studies have reported activation of the hexosamine pathway leading to the impaired nerve function. In addition, the hexosamine pathway can promote the expression of cytokines such as TGF-α and TGF-β1 [33, 34].

Hyperglycemia activates the hexosamine pathway that eventually results in increasing of transcription factor Sp1, which is promoting the overexpression of TGF-β1 and plasminogen activator inhibitor-1(PAI-1) in arterial endothelial cells [35, 36]. In addition, hyperglycemia induces the hexosamine pathway, and NF-κB signaling increases the expression of thrombospondin 2 (TSP2). TSP2 is a critical matricellular protein in injury responses. This appears to delay diabetic wound healing [37].

2.2.3. Activated AGE Pathway

In DM, nonenzymatic glycosylation of glucose can chemically interact with amino acids, lipids, and nucleic acids, which lead to the formation of reversible early glycosylation products. After chemical reconstitution irreversible AGEs subsequently form, AGE receptors exist in a variety of cell types such as vascular endothelial, vascular smooth cells, and others. As AGEs combine with their receptors, ultimately, extracellular and intracellular structure and function are altered [38].

The formation of AGEs on ECM molecules can increase ECM production and tissue stiffness directly or indirectly through activation of TGF-β receptors to stimulate cell growth. A signaling cascade triggered by the binding of AGEs to its receptor on the endothelial cell surface leads to activation of NADPH oxidase and overproduction of ROS, p21, RAS, and MAPKs. NF-κB is a key target of AGE-RAGE signaling. Excess oxidative stress derived from the AGE-RAGE axis activates NF-κB and affects transcriptional activation of numerous cytokines and adhesion molecules including endothelin-1, ICAM-1, E-selectin, and tissue factor, many of which are closely linked to inflammation and diabetic angiopathy [17].

AGEs also reduce the bioavailability of endothelium NO and cause the overproduction of ROS [39, 40]. It has been suggested that the AGEs-RAGE axis contributes to microvascular and macrovascular complications of diabetes [41].Thus, the process of the AGE pathway might induce neuropathy via impairing vasodilation, thickening capillary basement membrane, and endothelial hyperplasia.

In addition to the aforementioned effects, AGEs negatively impact diabetic ulcer healing by increasing apoptosis, decreasing the proliferation of fibroblasts, and reducing the activity of growth factors such as fibroblast growth factor [42]. Moreover, AGE-induced autophagy is associated with delayed cutaneous ulcer healing through stimulation of M1 polarized macrophage [43, 44].

2.2.4. Activated PKC Pathway

PKC is comprised of a group of serine/threonine protein kinases with important physiological functions affecting many cellular signaling transduction pathways [45]. There are several isoforms of PKC, which play a critical role in multiple biological systems. PKCα, βI, βII, and δ are main components of the peripheral nerve [46]. In the environment of hyperglycemia, overproduction of oxygen free radicals inhibits the activity of glyceraldehyde phosphate dehydrogenase (GAPD). This leads to increased conversion of dihydroxyacetone phosphate (DHAP) to diacylglycerol (DAG), which in turn activates the PKC pathway [47]. Activated PKC can mediate the production of oxygen free radicals, inhibiting the activity of NO, thus leading to damage of the endothelial function.

A diabetic mouse study paradoxically reported decreased PKC activity. The difference from the previously stated results was likely due to the reduced expression of membrane PKC-α translocated to the cytoplasm, while the expression of membrane PKCβII increased [48]. Recent studies have reported improved neural function of diabetic rats with the administration of nonselective PKC isoform inhibitors or selective PKC β inhibitors. In addition, the sustained increasing PKCδ of human fibroblasts of DM hindered wound healing and insulin signaling was observed, thereby PKCδ inhibition may be a novel approach for treating diabetic wounds [49]. In summary, the mechanism of the PKC pathway in diabetic complications remains unclear.

Recent experiments have suggested that benfotiamine, a lipid-soluble analogue of vitamin B1, might improve diabetic wound healing via preventing the activation of the hexosamine pathway and the AGE and PKC pathway [50]. Preclinical studies showed that stimulating Nrf2-mediated antioxidant in the local regenerative environment of diabetic wounds significantly improved the molecular and cellular composition of wound beds [51].

The process of OS is irreversible and exerts a memory effect on metabolism with the correction of hyperglycemia [52, 53]. It was well demonstrated that the duration and severity of hyperglycemia were associated with the occurrence and progression of diabetic neuropathy, and enhanced glucose control delayed the process of developing clinical neuropathy in type 1 diabetes mellitus [3, 54]. However, conclusions in type 2 diabetes mellitus remain elusive [3, 55]. Indeed, strict glucose control does appear to impair nerve conduction velocity and vibration threshold in type 2 diabetes mellitus. This might be because neurons are more prone to severe hypoglycemic episodes. With acute glucose fluctuations, the PKC pathway is activated while inflammatory factors and adhesion molecules were secreted [56, 57], which further results in endothelial dysfunction and oxidative stress of the peripheral nerve.

2.3. Diabetic Peripheral Artery Disease

The role of diabetic angiopathy is well described in diabetic wounds. Diabetic microangiopathy and macroangiopathy are the combined result of irreversible complex nonenzymatic glycation, elevated oxidative stress and inflammation, and endothelial dysfunction and hypercoagulability state [58].

Oxidative stress caused by activated biochemical pathways, such as the AGE/RAGE pathway, the polyol pathway, PKC activation, and the hexosamine pathway, results in production of inflammatory mediators, pericyte degeneration, thickening basement membrane, endothelial hyperplasia, NO reduction, impaired vasodilation, and increasing procoagulant biomarkers, such as IL-6, TNF-α, D-dimer, and PAI-1. All of these are in one way or another involved in the development of diabetic microangiopathy [5962]. The alteration of the capillary or arteriolar vessel structure prevented the delivery of nutrients and activated white blood cells to specific tissues, increases the susceptibility and severity of infections, and accelerates the occurrence and progression of diabetic ulcer. In addition, microthromboembolism might be more prone to occur in terminal vessels of smaller diameter, which aggravates ischemia and hypoxia of the local tissue in diabetic wounds. SKQ1 as a mitochondria-targeted antioxidant increased the number of myofibroblasts, lowered the levels of neutrophils, and elevated macrophage infiltration; moreover, SKQ1 decreased lipid peroxidation levels without alteration of circulatory IL-6 and TNF levels. SKQ1 treatment also improved cell migration, thereby improving dermal wound healing of genetically diabetic mice [63].

The biochemical pathways participated in the development of diabetic macroangiopathy were as follows: AGEs-RAGE axis, polyol pathway, hexosamine pathway, PKC activation, overproduction of ROS, and chronic inflammation [64, 65]. In turn, atherosclerosis induced endothelial dysfunction and inflammation, and these processes are worsened in diabetes [59]. Moreover, recent evidences investigated that hypoglycemia may also play an vital role in vascular complications of diabetes [66]. Hyperglycemia or short-term glucose fluctuations induced OS and proatherogenic gene expression alteration which will be long-lasting later even in normal glycemic conditions [67]. As a result, the lumen of large vessels in diabetes narrow or abstract, and tissue ischemia deteriorated, which lead to a delay in diabetic wound closure.

2.4. Topical Infection

Patients with uncontrolled DM are more prone to skin infections such as fungal and bacterial infections. In turn, infections make the wound difficult to heal. The microbiome in diabetic wounds is closely related to the skin microbiome showing complex time-dependent features as well as individual differences. Diabetic wounds display disease-related changes. Staphylococcal species dominate [6871].

3. Antioxidants in Diabetic Wound Healing

3.1. Antioxidant Effects of Antimetabolism Imbalance Drugs on Wound Healing

Metformin is a classic therapy for DM. Recent literatures have reported that metformin improved angiogenic functions of endothelial and endothelial progenitor cells by activating the NOS pathway, and it is effective in the treatment of skin wounds in diabetic mice [72, 73].

SGLT2 inhibitors, as a novel glucose-lowering approach, grow evidence suggesting that it can lower the mRNA expression of TNF-α, IL-6 and MCP-1, and infiltration of inflammatory cells in the plaque and adipose tissue to improve inflammation and endothelial function, which seem to be involved in the alleviation of atherosclerosis by empagliflozin [74, 75]. Furthermore, with SGLT2 inhibitor therapy, the proinflammatory phenotype and glucotoxicity in experimental diabetic animals were reversed [75]. In addition, hyperglycemia-induced mitochondrial dysfunction was relieved by SGLT2i in hyperglycemic mouse aorta vascular cultures [76]. Therefore, SGLT2i may be beneficial to diabetic wounds for healing.

Dipeptidyl peptidase-4 (DPP-4) inhibitors can lower blood glucose and reduce cardiovascular risk in patients with type 2 diabetes mellitus. Previous studies indicated that DPP-4 exerts a preventive effect on oxidative stress via Nrf2 or other pathways. Therefore, DDP-4 may be a treatment option for patients with diabetic chronic wounds [77, 78].

Fenofibrates, along with a proper diet to fight against high cholesterol and triglyceride levels, has been indicated to simulate keratinocyte differentiation and improve the skin barrier in vivo [79]. It also ameliorated oxidative stress and blockade of Wnt/β-catenin signaling [80]. These findings provide insights into treatment for diabetic ulcers. Systemically, use of statins exerts a reduction on cholesterol and can stimulate angiogenesis. Recent researches have revealed that stains can improve wound healing process in diabetic mice [8183]. These may be a considerable therapy for patients with diabetic chronic wounds in clinic.

3.2. Antioxidant Effects of Drugs for Diabetic Neuropathy on Wound Healing

α-Lipoic acids (ALA) have been demonstrated to inhibit the progression of diabetic neuropathy by scavenging ROS, regeneration of endogenous and exogenous antioxidants, renovation of oxidized proteins, inhibition of NF-Kb, and regulation of gene transcription. Nowadays, it is widely used in the clinic for diabetic microangiopathy [64, 84, 85].

Coenzyme Q10, an endogenous synthesized lipid and a vitamin-like substance primarily present in the mitochondria, ameliorates oxidant stress and apoptosis [86]. CoQ10 is an electron transport in the mitochondrial respiratory chain, consequently increasing energy generation of ATP and enhancing the mitochondrial antioxidant activity [87]. Aldose reductase inhibitors are used to inhibit oxidative stress by the polyol pathway [31], and it may be beneficial for improving diabetic ulcer with neuropathy.

3.3. Antioxidant Effects of Drugs for Diabetic Angiopathies on Wound Healing

Cilostazol, a phosphodiesterase type 3 inhibitor, has been suggested to be involved in the procedure of antiatherosclerosis with antiplatelet and vasodilatory effects. A study on diabetic mice indicated that cilostazol significantly reduced RAGE, ROS, NF-κB signaling, downstream gene expressions, and cell functions induced by hyperglycemia in VSMCs [88]. Low molecular-weight heparin ameliorates chronic diabetic wound healing, possibly by increasing microcirculation of wound margin [89, 90], but it is still controversy [91]. Iloprost improved limb perfusion and may be an important therapy for diabetic ulcerative lesions with severe ischemia [92]. However, there are only sparse data and lack of high-quality randomized controlled studies to show efficacy in any of these three agents [93].

3.4. Antioxidant Effects of Drugs for Diabetic Skin on Wound Healing

The epidermal growth factor (EGF) administration was beneficial for the alleviation of oxidative stress to improve wound repair [94]. Biogenic AgNPs synthesized from Brevibacillus brevis KN8 could inhibit the overexpression of MMP-2 and MMP-9 in granulation tissues and accelerated wound healing in diabetic mice beyond the antimicrobial activity [95]. Sodium pentaborate pentahydrate (NaB) displayed great antimicrobial properties and improved proliferation, migration, and the expression of growth factor and gene expression in dermis, and studies on diabetic rats proved that NaB improve diabetic wound healing rate [96].

3.5. Antioxidant Effects of Drugs for Diabetic Infection on Wound Healing

Strict antimicrobial dressing should be performed in diabetic ulcers with infection [97]. The microbiome in wound is associated to the skin microbiome showing complex and time-dependent features, as well as individual differences [68]. The microbial culture can be used to guide antimicrobial therapy.

Efficient antimicrobial treatment with daptomycin [98] exerted positive effects on wound healing at the molecular level, such as reducing the level of local IL-6 and MMP-9 and increasing TIMP-1 in the MRSA-infected diabetic wound.

3.6. Antioxidant Effects of Plant Ingredients on Wound Healing

Ferulic acid (FA) is a natural antioxidant derived from fruits and vegetables that inhibited lipid peroxidation and increased the expression of catalase, superoxide dismutase, glutathione, nitric oxide, and serum zinc and copper, probably improving the healing process in diabetic ulcer [99]. Besides, syringic acid treatment also promotes migration and proliferation to improve wound healing [100].

The fusion protein decreased serum proinflammatory cytokines such as IL-6, TNF-α, expression of cyclooxygenase-2, and increased activities of antioxidant enzyme including superoxide dismutase, glutathione peroxidase, and catalase, and it also increased proangiogenic cytokines levels including VEGF, intercellular adhesion molecule, and expression of VEGF, FGF-2, p-ERK, and p-Akt protein in granulation in diabetic rats, which significantly accelerated the diabetic wound healing [101].

Animal study has indicated chlorogenic acid, a dietary antioxidant, that could accelerate wound healing, enhance hydroxyproline content, decrease malondialdehyde/nitric oxide, and elevate the level of reduced glutathione in wound bed [102]. However, a number of researches are needed to furtherly confirm these data.

3.7. Antioxidant Effects of Potential Antioxidants on Wound Healing

The drug-loaded ROS-scavenging hydrogel promotes wound closure by decreasing the ROS level and upregulating M2 phenotype macrophages around the wound. Moreover, such hydrogels formed in wound also increased the release of granulocyte macrophage colony-stimulating factor to fight against external bacteria and improve the wound closure [103].

The experiment has indicated that deferoxamine (DFO) could reduce oxidative stress and promote hypoxia-inducible factor-1 alpha activation to facilitate neovascularization and regeneration in chronic diabetic wounds. Dominik Duscher has demonstrated the treatment of DFO and the enhanced concept drug delivery system treatment eTDDS that markedly increased wound vascularity, dermal thickness, collagen deposition, and tensile strength, thereby accelerating wound healing. Therefore, DFO eTDDS may have the potential in treatment of diabetic wounds [104].

In addition, vitamins A, C, and E are antioxidants [105]; however, some literature has reported that high doses of vitamins possibly increase the mortality of cardiovascular events and risk of tumors such as lung and skin tumors [106, 107]. Propolis could increase the glutathione (GSH) and GSH/glutathione disulfide (GSSG) ratio, deplete TNF, and increased interleukin10 levels to reduce the wound area [108]. Antioxidant with N-acetyl cysteine (NAC) is known to improve endothelial cell function and angiogenesis, and Mohamed et.al reported that daily NAC use improved postamputation stump healing, perfusion, neovascularization, and reduced muscle fiber damage [109, 110] (Table 1).

Further research is needed to confirm or refute whether these therapies are beneficial to diabetic wound healing. In addition, melatonin, taurine, and acetyl L-carnitine have been reported to improve oxidative stress in diabetic wounds in the recent literatures. However, a number of randomized controlled studies are needed to confirm.

4. Conclusion

Wound healing is a complex, dynamic process. However, most diabetic wounds are difficult to heal. Multiple factors such as hyperglycemia, neuropathy, blood supply, matrix turnover, wound contraction, and the microbiome play a role in the complex symphony of diabetic wound healing. Oxidative stress regulates wound healing through several related signal pathways. It therefore stands to reason that active control of ROS levels through antioxidants and antioxidative enzyme systems may reduce oxidative stress-induced damage to improve wound healing. Traditional systemic and topical medications could be beneficial for wound healing. Clinicians and scientists would do well to focus on development and testing of antioxidants to facilitate diabetic wound healing, thereby reducing the unnecessary burden of amputation, morbidity, and mortality in this population.

Conflicts of Interest

The authors declare no conflicts of interest.

Authors’ Contributions

WD conceived of and designed the study and revised the manuscript for important intellectual content. LD, PS, and TC performed the literature search. CD generated the figures and tables. WD and LD performed the background research. WD and DGA edited the manuscript. LD and WD drafted the manuscript. All authors have read and approved the content of the manuscript.

Acknowledgments

This research was funded by the Natural Science Foundation of Chongqing Municipal Science and Technology Bureau (cstc2018jcyjAX0335; cstc2020jcyj-msxmX0298), the Fundamental Research Funds of Central Universities at Chongqing University (2019CDYGYB020) awarded to Dr. Wuquan Deng, and also partially supported by the National Institutes of Health, National Institute of Diabetes and Digestive and Kidney Diseases (1R01124789-01A1) awarded to Dr. Armstrong DG.

References

  1. D. G. Armstrong, M. A. Swerdlow, A. A. Armstrong, M. S. Conte, W. V. Padula, and S. A. Bus, “Five year mortality and direct costs of care for people with diabetic foot complications are comparable to cancer,” Journal of Foot and Ankle Research, vol. 13, no. 1, p. 16, 2020. View at: Publisher Site | Google Scholar
  2. A. J. M. Boulton, D. G. Armstrong, M. J. Hardman et al., Diagnosis and management of diabetic foot infections, American Diabetes Association, Arlington, (VA), 2020. View at: Publisher Site
  3. B. C. Callaghan, A. A. Little, E. L. Feldman, and R. A. C. Hughes, “Enhanced glucose control for preventing and treating diabetic neuropathy,” Cochrane Database of Systematic Reviews, vol. 6, article Cd007543, 2012. View at: Publisher Site | Google Scholar
  4. C. Dunnill, T. Patton, J. Brennan et al., “Reactive oxygen species (ROS) and wound healing: the functional role of ROS and emerging ROS-modulating technologies for augmentation of the healing process,” International Wound Journal, vol. 14, no. 1, pp. 89–96, 2017. View at: Publisher Site | Google Scholar
  5. M. C. Sanchez, S. Lancel, E. Boulanger, and R. Neviere, “Targeting oxidative stress and mitochondrial dysfunction in the treatment of impaired wound healing: a systematic review,” Antioxidants, vol. 7, no. 8, p. 98, 2018. View at: Publisher Site | Google Scholar
  6. J. Dworzanski, M. Strycharz-Dudziak, E. Kliszczewska et al., “Glutathione peroxidase (GPx) and superoxide dismutase (SOD) activity in patients with diabetes mellitus type 2 infected with Epstein-Barr virus,” PLoS One, vol. 15, no. 3, article e0230374, 2020. View at: Publisher Site | Google Scholar
  7. D. G. Armstrong and G. C. Gurtner, “A histologically hostile environment made more hospitable?” Nature Reviews Endocrinology, vol. 14, no. 9, pp. 511-512, 2018. View at: Publisher Site | Google Scholar
  8. A. L. Lima, T. Illing, S. Schliemann, and P. Elsner, “Cutaneous manifestations of diabetes mellitus: a review,” American Journal of Clinical Dermatology, vol. 18, no. 4, pp. 541–553, 2017. View at: Publisher Site | Google Scholar
  9. J. H. Kim, N. Y. Yoon, D. H. Kim et al., “Impaired permeability and antimicrobial barriers in type 2 diabetes skin are linked to increased serum levels of advanced glycation end-product,” Experimental Dermatology, vol. 27, no. 8, pp. 815–823, 2018. View at: Publisher Site | Google Scholar
  10. H.-Y. Park, J.-H. Kim, M. Jung et al., “A long-standing hyperglycaemic condition impairs skin barrier by accelerating skin ageing process,” Experimental Dermatology, vol. 20, no. 12, pp. 969–974, 2011. View at: Publisher Site | Google Scholar
  11. T. A. M. Andrade, D. S. Masson-Meyers, G. F. Caetano et al., “Skin changes in streptozotocin-induced diabetic rats,” Biochemical and Biophysical Research Communications, vol. 490, no. 4, pp. 1154–1161, 2017. View at: Publisher Site | Google Scholar
  12. M. Long, M. R. de la Vega, Q. Wen et al., “An essential role of NRF2 in diabetic wound healing,” Diabetes, vol. 65, no. 3, pp. 780–793, 2016. View at: Publisher Site | Google Scholar
  13. C.-C. E. Lan, C.-S. Wu, S.-M. Huang, I.-H. Wu, and G.-S. Chen, “High-glucose environment enhanced oxidative stress and increased interleukin-8 secretion from keratinocytes: new insights into impaired diabetic wound healing,” Diabetes, vol. 62, no. 7, pp. 2530–2538, 2013. View at: Publisher Site | Google Scholar
  14. J. H. Kim, B. Yang, A. Tedesco et al., “High levels of oxidative stress and skin microbiome are critical for initiation and development of chronic wounds in diabetic mice,” Scientific Reports, vol. 9, no. 1, p. 19318, 2019. View at: Publisher Site | Google Scholar
  15. E. Baldini, E. Testa, C. Voellenkle et al., “Dysregulation of microRNA expression in diabetic skin,” Journal of Dermatological Science, vol. 98, no. 3, pp. 186–194, 2020. View at: Publisher Site | Google Scholar
  16. Y. W. Niu, M. Y. Miao, W. Dong, J. Y. Dong, X. Z. Cao, and S. L. Lu, “Effects of advanced glycation end products and its receptor on oxidative stress in diabetic wounds,” Zhonghua Shao Shang Za Zhi, vol. 28, pp. 32–35, 2012. View at: Google Scholar
  17. A. Goldin, J. A. Beckman, A. M. Schmidt, and M. A. Creager, “Advanced glycation end products: sparking the development of diabetic vascular injury,” Circulation, vol. 114, no. 6, pp. 597–605, 2006. View at: Publisher Site | Google Scholar
  18. J. A. David, W. J. Rifkin, P. S. Rabbani, and D. J. Ceradini, “The Nrf2/Keap1/ARE pathway and oxidative stress as a therapeutic target in type II diabetes mellitus,” Journal Diabetes Research, vol. 2017, article 4826724, 15 pages, 2017. View at: Publisher Site | Google Scholar
  19. M. A. Soares, O. D. Cohen, Y. C. Low et al., “Restoration of Nrf2 signaling normalizes the regenerative niche,” Diabetes, vol. 65, no. 3, pp. 633–646, 2016. View at: Publisher Site | Google Scholar
  20. R. Teena, U. Dhamodharan, D. Ali, K. Rajesh, and K. M. Ramkumar, “Genetic polymorphism of the Nrf2 promoter region (rs35652124) is associated with the risk of diabetic foot ulcers,” Oxidative Medicine and Cellular Longevity, vol. 2020, Article ID 9825028, 9 pages, 2020. View at: Publisher Site | Google Scholar
  21. X. Li, G. Wu, F. Han et al., “SIRT1 activation promotes angiogenesis in diabetic wounds by protecting endothelial cells against oxidative stress,” Archives of biochemistry and biophysics, vol. 661, pp. 117–124, 2019. View at: Publisher Site | Google Scholar
  22. S. Yang, M. Xu, G. Meng, and Y. Lu, “SIRT3 deficiency delays diabetic skin wound healing via oxidative stress and necroptosis enhancement,” Journal of Cellular and Molecular Medicine, vol. 24, no. 8, pp. 4415–4427, 2020. View at: Publisher Site | Google Scholar
  23. D. G. Armstrong, A. J. M. Boulton, and S. A. Bus, “Diabetic foot ulcers and their recurrence,” The New England Journal of Medicine, vol. 376, no. 24, pp. 2367–2375, 2017. View at: Publisher Site | Google Scholar
  24. D. G. Armstrong, “The 10-g monofilament: the diagnostic divining rod for the diabetic foot?” Diabetes Care, vol. 23, no. 7, p. 887, 2000. View at: Publisher Site | Google Scholar
  25. D. G. Armstrong, L. A. Lavery, and L. B. Harkless, “Who is at risk for diabetic foot ulceration?” Clinics in Podiatric Medicine and Surgery, vol. 15, no. 1, pp. 11–19, 1998. View at: Google Scholar
  26. I. G. Obrosova, “Update on the pathogenesis of diabetic neuropathy,” Current Diabetes Reports, vol. 3, no. 6, pp. 439–445, 2003. View at: Publisher Site | Google Scholar
  27. D. C. Rosenberger, V. Blechschmidt, H. Timmerman, A. Wolff, and R.-D. Treede, “Challenges of neuropathic pain: focus on diabetic neuropathy,” Journal of Neural Transmission, vol. 127, pp. 589–624, 2020. View at: Publisher Site | Google Scholar
  28. P. Fernyhough and J. McGavock, “Mechanisms of disease,” Handbook of clinical neurology, vol. 126, pp. 353–377, 2014. View at: Publisher Site | Google Scholar
  29. L. Pang, X. Lian, H. Liu et al., “Understanding diabetic neuropathy: focus on oxidative stress,” Oxidative Medicine and Cellular Longevity, vol. 2020, Article ID 9524635, 13 pages, 2020. View at: Publisher Site | Google Scholar
  30. E. C. M. Ho, K. S. L. Lam, Y. S. Chen et al., “Aldose reductase-deficient mice are protected from delayed motor nerve conduction velocity, increased c-Jun NH2-terminal kinase activation, depletion of reduced glutathione, increased superoxide accumulation, and DNA damage,” Diabetes, vol. 55, no. 7, pp. 1946–1953, 2006. View at: Publisher Site | Google Scholar
  31. S. K. Srivastava, U. C. S. Yadav, A. B. M. Reddy et al., “Aldose reductase inhibition suppresses oxidative stress-induced inflammatory disorders,” Chemico-Biological Interactions, vol. 191, pp. 330–338, 2011. View at: Publisher Site | Google Scholar
  32. A. Hosseini and M. Abdollahi, “Diabetic neuropathy and oxidative stress: therapeutic perspectives,” Oxidative Medicine and Cellular Longevity, vol. 2013, Article ID 168039, 15 pages, 2013. View at: Publisher Site | Google Scholar
  33. P. P. Sayeski and J. E. Kudlow, “Glucose metabolism to glucosamine is necessary for glucose stimulation of transforming growth Factor-α gene transcription,” The Journal of Biological Chemistry, vol. 271, no. 25, pp. 15237–15243, 1996. View at: Publisher Site | Google Scholar
  34. V. Kolm-Litty, U. Sauer, A. Nerlich, R. Lehmann, and E. D. Schleicher, “High glucose-induced transforming growth factor beta1 production is mediated by the hexosamine pathway in porcine glomerular mesangial cells,” The Journal of Clinical Investigation, vol. 101, no. 1, pp. 160–169, 1998. View at: Publisher Site | Google Scholar
  35. X. L. Du, D. Edelstein, L. Rossetti et al., “Hyperglycemia-induced mitochondrial superoxide overproduction activates the hexosamine pathway and induces plasminogen activator inhibitor-1 expression by increasing Sp1 glycosylation,” Proceedings of the National Academy of Sciences of the United States of America, vol. 97, no. 22, pp. 12222–12226, 2000. View at: Publisher Site | Google Scholar
  36. Y.-Q. Chen, M. Su, R. R. Walia, Q. Hao, J. W. Covington, and D. E. Vaughan, “Sp1 sites mediate activation of the plasminogen activator inhibitor-1 promoter by glucose in vascular smooth muscle cells,” Journal of Biological Chemistry, vol. 273, pp. 8225–8231, 1998. View at: Publisher Site | Google Scholar
  37. B. Kunkemoeller, T. Bancroft, H. Xing et al., “Elevated thrombospondin 2 contributes to delayed wound healing in diabetes,” Diabetes, vol. 68, no. 10, pp. 2016–2023, 2019. View at: Publisher Site | Google Scholar
  38. C. Y. Chen, A. M. Abell, Y. S. Moon, and K. H. Kim, “An advanced glycation end product (AGE)-receptor for AGEs (RAGE) axis restores adipogenic potential of senescent preadipocytes through modulation of p53 protein function,” The Journal of biological chemistry, vol. 287, no. 53, pp. 44498–44507, 2012. View at: Publisher Site | Google Scholar
  39. G. D. Frank, S. Eguchi, and E. D. Motley, “The role of reactive oxygen species in insulin signaling in the vasculature,” Antioxidants & redox signaling, vol. 7, no. 7-8, pp. 1053–1061, 2005. View at: Publisher Site | Google Scholar
  40. R. Bucala, K. J. Tracey, and A. Cerami, “Advanced glycosylation products quench nitric oxide and mediate defective endothelium-dependent vasodilatation in experimental diabetes,” The Journal of clinical investigation, vol. 87, no. 2, pp. 432–438, 1991. View at: Publisher Site | Google Scholar
  41. M. Brownlee, H. Vlassara, and A. Cerami, “Nonenzymatic glycosylation and the pathogenesis of diabetic complications,” Annals of internal medicine, vol. 101, no. 4, pp. 527–537, 1984. View at: Publisher Site | Google Scholar
  42. Y. Duraisamy, M. Slevin, N. Smith et al., “Effect of glycation on basic fibroblast growth factor induced angiogenesis and activation of associated signal transduction pathways in vascular endothelial cells: possible relevance to wound healing in diabetes,” Angiogenesis, vol. 4, no. 4, pp. 277–288, 2001. View at: Publisher Site | Google Scholar
  43. R. Kang, D. Tang, M. T. Lotze, and H. J. Zeh 3rd., “RAGE regulates autophagy and apoptosis following oxidative injury,” Autophagy, vol. 7, pp. 442–444, 2014. View at: Publisher Site | Google Scholar
  44. Y. Guo, C. Lin, P. Xu et al., “AGEs induced autophagy impairs cutaneous wound healing via stimulating macrophage polarization to M1 in diabetes,” Scientific Reports, vol. 6, no. 1, article 36416, 2016. View at: Publisher Site | Google Scholar
  45. M. Freeley, D. Kelleher, and A. Long, “Regulation of protein kinase C function by phosphorylation on conserved and non-conserved sites,” Cellular signalling, vol. 23, no. 5, pp. 753–762, 2011. View at: Publisher Site | Google Scholar
  46. C. P. Tseng and A. K. Verma, “Functional expression and characterization of the mouse epitope tag-protein kinase C isoforms, alpha, beta I, beta II, gamma, delta and epsilon,” Gene, vol. 169, no. 2, pp. 287-288, 1996. View at: Publisher Site | Google Scholar
  47. M. Brownlee, “Biochemistry and molecular cell biology of diabetic complications,” Nature, vol. 414, no. 6865, pp. 813–820, 2001. View at: Publisher Site | Google Scholar
  48. K. Uehara, S.-I. Yamagishi, S. Otsuki, S. Chin, and S. Yagihashi, “Effects of polyol pathway hyperactivity on protein kinase C activity, nociceptive peptide expression, and neuronal structure in dorsal root ganglia in diabetic mice,” Diabetes, vol. 53, no. 12, pp. 3239–3247, 2004. View at: Publisher Site | Google Scholar
  49. M. Khamaisi, S. Katagiri, H. Keenan et al., “PKCδ inhibition normalizes the wound-healing capacity of diabetic human fibroblasts,” The Journal of clinical investigation, vol. 126, no. 3, pp. 837–853, 2016. View at: Publisher Site | Google Scholar
  50. A. Stirban, M. Negrean, B. Stratmann et al., “Benfotiamine prevents macro- and microvascular endothelial dysfunction and oxidative stress following a meal rich in advanced glycation end products in individuals with type 2 diabetes,” Diabetes Care, vol. 29, no. 9, pp. 2064–2071, 2006. View at: Publisher Site | Google Scholar
  51. P. S. Rabbani, T. Ellison, B. Waqas et al., “Targeted Nrf2 activation therapy with RTA 408 enhances regenerative capacity of diabetic wounds,” Diabetes Research and Clinical Practice, vol. 139, pp. 11–23, 2018. View at: Publisher Site | Google Scholar
  52. A. Ceriello, S. Kumar, L. Piconi, K. Esposito, and D. Giugliano, “Simultaneous control of hyperglycemia and oxidative stress normalizes endothelial function in type 1 diabetes,” Diabetes Care, vol. 30, no. 3, pp. 649–654, 2007. View at: Publisher Site | Google Scholar
  53. A. Ceriello, M. A. Ihnat, and J. E. Thorpe, “Clinical review 2: the "metabolic memory": is more than just tight glucose control necessary to prevent diabetic complications?” The Journal of Clinical Endocrinology and Metabolism, vol. 94, no. 2, pp. 410–415, 2009. View at: Publisher Site | Google Scholar
  54. B. Fullerton, K. Jeitler, M. Seitz, K. Horvath, A. Berghold, and A. Siebenhofer, “Intensive glucose control versus conventional glucose control for type 1 diabetes mellitus,” Cochrane Database of Systematic Reviews, vol. 2014, article Cd009122, 2014. View at: Publisher Site | Google Scholar
  55. K. M. Pantalone, A. D. Misra-Hebert, T. M. Hobbs et al., “Effect of glycemic control on the diabetes complications severity index score and development of complications in people with newly diagnosed type 2 diabetes,” Journal of Diabetes, vol. 10, no. 3, pp. 192–199, 2018. View at: Publisher Site | Google Scholar
  56. L. Monnier, E. Mas, C. Ginet et al., “Activation of oxidative stress by acute glucose fluctuations compared with sustained chronic hyperglycemia in patients with type 2 diabetes,” Journal of the American Medical Association, vol. 295, no. 14, pp. 1681–1687, 2006. View at: Publisher Site | Google Scholar
  57. A. Ceriello, K. Esposito, L. Piconi et al., “Oscillating glucose is more deleterious to endothelial function and oxidative stress than mean glucose in normal and type 2 diabetic patients,” Diabetes, vol. 57, no. 5, pp. 1349–1354, 2008. View at: Publisher Site | Google Scholar
  58. R. B. Goldberg, “Cytokine and cytokine-like inflammation markers, endothelial dysfunction, and imbalanced coagulation in development of diabetes and its complications,” The Journal of Clinical Endocrinology and Metabolism, vol. 94, no. 9, pp. 3171–3182, 2009. View at: Publisher Site | Google Scholar
  59. G. Balasubramanian, P. Vas, N. Chockalingam, and R. Naemi, “A Synoptic Overview of Neurovascular Interactions in the Foot,” Frontiers in Endocrinology, vol. 11, 2020. View at: Publisher Site | Google Scholar
  60. B. T. Ngo, K. D. Hayes, D. J. DiMiao, S. K. Srinivasan, C. J. Huerter, and M. S. Rendell, “Manifestations of cutaneous diabetic microangiopathy,” American Journal of Clinical Dermatology, vol. 6, no. 4, pp. 225–237, 2005. View at: Publisher Site | Google Scholar
  61. C. P. Domingueti, L. M. Sant'Ana Dusse, M. das Graças Carvalho, L. P. de Sousa, K. B. Gomes, and A. P. Fernandes, “Diabetes mellitus: the linkage between oxidative stress, inflammation, hypercoagulability and vascular complications,” Journal of Diabetes and its Complications, vol. 30, no. 4, pp. 738–745, 2016. View at: Publisher Site | Google Scholar
  62. F. Semeraro, F. Morescalchi, A. Cancarini, A. Russo, S. Rezzola, and C. Costagliola, “Diabetic retinopathy, a vascular and inflammatory disease: therapeutic implications,” Diabetes & Metabolism, vol. 45, no. 6, pp. 517–527, 2019. View at: Publisher Site | Google Scholar
  63. I. A. Demyanenko, V. V. Zakharova, O. P. Ilyinskaya et al., “Mitochondria-targeted antioxidant SkQ1 improves dermal wound healing in genetically diabetic mice,” Oxidative Medicine and Cellular Longevity, vol. 2017, Article ID 6408278, 10 pages, 2017. View at: Publisher Site | Google Scholar
  64. K. G. Park, M. J. Kim, H. S. Kim, S. J. Lee, D. K. Song, and I. K. Lee, “Prevention and treatment of macroangiopathy: focusing on oxidative stress,” Diabetes Research and Clinical Practice, vol. 66, Suppl 1, pp. S57–S62, 2004. View at: Publisher Site | Google Scholar
  65. N. Katakami, “Mechanism of development of atherosclerosis and cardiovascular disease in diabetes mellitus,” Journal of Atherosclerosis and Thrombosis, vol. 25, no. 1, pp. 27–39, 2018. View at: Publisher Site | Google Scholar
  66. M. Hanefeld, E. Duetting, and P. Bramlage, “Cardiac implications of hypoglycaemia in patients with diabetes - a systematic review,” Cardiovascular Diabetology, vol. 12, no. 1, p. 135, 2013. View at: Publisher Site | Google Scholar
  67. A. El-Osta, D. Brasacchio, D. Yao et al., “Transient high glucose causes persistent epigenetic changes and altered gene expression during subsequent normoglycemia,” The Journal of Experimental Medicine, vol. 205, no. 10, pp. 2409–2417, 2008. View at: Publisher Site | Google Scholar
  68. G. Daeschlein, P. Hinz, T. Kiefer, and M. Jünger, “Role of the microbiome in chronic wounds,” Der Hautarzt, vol. 70, pp. 422–431, 2019. View at: Publisher Site | Google Scholar
  69. A. Spichler, B. L. Hurwitz, D. G. Armstrong, and B. A. Lipsky, “Microbiology of diabetic foot infections: from Louis Pasteur to 'crime scene investigation',” BMC Medicine, vol. 13, no. 1, p. 2, 2015. View at: Publisher Site | Google Scholar
  70. A. S. Moffarah, M. Al Mohajer, B. L. Hurwitz, and D. G. Armstrong, “Skin and soft tissue infections,” in Diagnostic Microbiology of the Immunocompromised Host, pp. 51–68, Wiley, 2016. View at: Publisher Site | Google Scholar
  71. G. S. Watts, J. E. Thornton, K. Youens-Clark et al., “Identification and quantitation of clinically relevant microbes in patient samples: comparison of three k-mer based classifiers for speed, accuracy, and sensitivity,” PLoS Computational Biology, vol. 15, no. 11, article e1006863, 2019. View at: Publisher Site | Google Scholar
  72. L. M. Shawky, E. A. El Bana, and A. A. Morsi, “Stem cells and metformin synergistically promote healing in experimentally induced cutaneous wound injury in diabetic rats,” Folia Histochemica et Cytobiologica, vol. 57, no. 3, pp. 127–138, 2019. View at: Publisher Site | Google Scholar
  73. X. Han, Y. Tao, Y. Deng, J. Yu, Y. Sun, and G. Jiang, “Metformin accelerates wound healing in type 2 diabetic db/db mice,” Molecular Medicine Reports, vol. 16, no. 6, pp. 8691–8698, 2017. View at: Publisher Site | Google Scholar
  74. J. H. Han, T. J. Oh, G. Lee et al., “The beneficial effects of empagliflozin, an SGLT2 inhibitor, on atherosclerosis in ApoE (-/-) mice fed a western diet,” Diabetologia, vol. 60, no. 2, pp. 364–376, 2017. View at: Publisher Site | Google Scholar
  75. M. Oelze, S. Kröller-Schön, P. Welschof et al., “The sodium-glucose co-transporter 2 inhibitor empagliflozin improves diabetes-induced vascular dysfunction in the streptozotocin diabetes rat model by interfering with oxidative stress and glucotoxicity,” PLoS One, vol. 9, article e112394, 2014. View at: Publisher Site | Google Scholar
  76. V. K. Pulakazhi Venu, M. El-Daly, M. Saifeddine et al., “Minimizing hyperglycemia-induced vascular endothelial dysfunction by inhibiting endothelial sodium-glucose cotransporter 2 and attenuating oxidative stress: implications for treating individuals with type 2 diabetes,” Canadian Journal of Diabetes, vol. 43, no. 7, pp. 510–514, 2019. View at: Publisher Site | Google Scholar
  77. S. H. Choi, S. Park, C. J. Oh, J. Leem, K. G. Park, and I. K. Lee, “Dipeptidyl peptidase-4 inhibition by gemigliptin prevents abnormal vascular remodeling via NF-E2-related factor 2 activation,” Vascular Pharmacology, vol. 73, pp. 11–19, 2015. View at: Publisher Site | Google Scholar
  78. A. Avogaro and G. P. Fadini, “The effects of dipeptidyl peptidase-4 inhibition on microvascular diabetes complications,” Diabetes Care, vol. 37, pp. 2884–2894, 2014. View at: Publisher Site | Google Scholar
  79. L. G. Kömüves, K. Hanley, A. M. Lefebvre et al., “Stimulation of PPARα promotes epidermal keratinocyte differentiation in vivo,” The Journal of Investigative Dermatology, vol. 115, no. 3, pp. 353–360, 2000. View at: Publisher Site | Google Scholar
  80. Q. Liu, X. Zhang, R. Cheng, J. X. Ma, J. Yi, and J. Li, “Salutary effect of fenofibrate on type 1 diabetic retinopathy via inhibiting oxidative stress-mediated Wnt/β-catenin pathway activation,” Cell and Tissue Research, vol. 376, no. 2, pp. 165–177, 2019. View at: Publisher Site | Google Scholar
  81. J. Asai, H. Takenaka, S. Hirakawa et al., “Topical simvastatin accelerates wound healing in diabetes by enhancing angiogenesis and lymphangiogenesis,” The American journal of pathology, vol. 181, no. 6, pp. 2217–2224, 2012. View at: Publisher Site | Google Scholar
  82. A. P. Sawaya, I. Jozic, R. C. Stone et al., “Mevastatin promotes healing by targeting caveolin-1 to restore EGFR signaling,” JCI insight, vol. 4, no. 23, 2019. View at: Publisher Site | Google Scholar
  83. A. Bitto, L. Minutoli, D. Altavilla et al., “Simvastatin enhances VEGF production and ameliorates impaired wound healing in experimental diabetes,” Pharmacological Research, vol. 57, no. 2, pp. 159–169, 2008. View at: Publisher Site | Google Scholar
  84. G.-D. Xiang, H.-L. Sun, L.-S. Zhao, J. Hou, L. Yue, and L. Xu, “The antioxidant alpha-lipoic acid improves endothelial dysfunction induced by acute hyperglycaemia during OGTT in impaired glucose tolerance,” Clinical Endocrinology, vol. 68, pp. 716–723, 2008. View at: Publisher Site | Google Scholar
  85. A. S. Ametov, A. Barinov, P. J. Dyck et al., “The sensory symptoms of diabetic polyneuropathy are improved with alpha-lipoic acid: the SYDNEY trial,” Diabetes Care, vol. 26, no. 3, pp. 770–776, 2003. View at: Publisher Site | Google Scholar
  86. N. Sadeghiyan Galeshkalami, M. Abdollahi, R. Najafi et al., “Alpha-lipoic acid and coenzyme Q10 combination ameliorates experimental diabetic neuropathy by modulating oxidative stress and apoptosis,” Life Sciences, vol. 216, pp. 101–110, 2019. View at: Publisher Site | Google Scholar
  87. N. Bhadri, T. Sanji, H. M. Guggilla, and R. Razdan, “Amelioration of behavioural, biochemical, and neurophysiological deficits by combination of monosodium glutamate with resveratrol/alpha-lipoic acid/coenzyme Q10 in rat model of cisplatin-induced peripheral neuropathy,” ScientificWorldJournal, vol. 2013, article 565813, 8 pages, 2013. View at: Publisher Site | Google Scholar
  88. S.-C. Su, Y.-J. Hung, C.-L. Huang et al., “Cilostazol inhibits hyperglucose-induced vascular smooth muscle cell dysfunction by modulating the RAGE/ERK/NF-κB signaling pathways,” Journal of Biomedical Science, vol. 26, p. 68, 2019. View at: Publisher Site | Google Scholar
  89. G. Jörneskog, K. Brismar, and B. Fagrell, “Low molecular weight heparin seems to improve local capillary circulation and healing of chronic foot ulcers in diabetic patients,” VASA Zeitschrift fur Gefasskrankheiten, vol. 22, pp. 137–142, 1993. View at: Google Scholar
  90. M. Kalani, J. Apelqvist, M. Blombäck et al., “Effect of dalteparin on healing of chronic foot ulcers in diabetic patients with peripheral arterial occlusive disease: a prospective, randomized, double-blind, placebo-controlled study,” Diabetes Care, vol. 26, no. 9, pp. 2575–2580, 2003. View at: Publisher Site | Google Scholar
  91. J. Aragón-Sánchez and J. L. Lázaro-Martínez, “Comments on the use of bemiparin in diabetic foot ulcers,” Diabetic Medicine, vol. 26, no. 1, p. 110, 2009. View at: Publisher Site | Google Scholar
  92. F. Mirenda, M. La Spada, D. Baccellieri, F. Stilo, F. Benedetto, and F. Spinelli, “Iloprost infusion in diabetic patients with peripheral arterial occlusive disease and foot ulcers,” Chirurgia italiana, vol. 57, pp. 731–735, 2005. View at: Google Scholar
  93. T. Elraiyah, A. Tsapas, G. Prutsky et al., “A systematic review and meta-analysis of adjunctive therapies in diabetic foot ulcers,” Journal of Vascular Surgery, vol. 63, 2016. View at: Publisher Site | Google Scholar
  94. A. G. Ojalvo, J. B. Acosta, Y. M. Mari et al., “Healing enhancement of diabetic wounds by locally infiltrated epidermal growth factor is associated with systemic oxidative stress reduction,” International Wound Journal, vol. 14, no. 1, pp. 214–225, 2017. View at: Publisher Site | Google Scholar
  95. N. Krishnan, B. Velramar, B. Ramatchandirin et al., “Effect of biogenic silver nanocubes on matrix metalloproteinases 2 and 9 expressions in hyperglycemic skin injury and its impact in early wound healing in streptozotocin-induced diabetic mice,” Materials Science and Engineering: C, vol. 91, pp. 146–152, 2018. View at: Publisher Site | Google Scholar
  96. S. Demirci, A. Doğan, S. Aydın, E. Ç. Dülger, and F. Şahin, “Boron promotes streptozotocin-induced diabetic wound healing: roles in cell proliferation and migration, growth factor expression, and inflammation,” Molecular and Cellular Biochemistry, vol. 417, no. 1-2, pp. 119–133, 2016. View at: Publisher Site | Google Scholar
  97. J. C. Dumville, B. A. Lipsky, C. Hoey, M. Cruciani, M. Fiscon, and J. Xia, “Topical antimicrobial agents for treating foot ulcers in people with diabetes,” Cochrane Database of Systematic Review, vol. 6, article Cd011038, 2017. View at: Publisher Site | Google Scholar
  98. A. Ambrosch, D. Halevy, B. Fwity, T. Brin, and R. Lobmann, “Effect of daptomycin on local interleukin-6, matrix metalloproteinase-9, and metallopeptidase inhibitor 1 in patients with MRSA-infected diabetic foot,” The international journal of lower extremity wounds, vol. 13, no. 1, pp. 12–16, 2014. View at: Publisher Site | Google Scholar
  99. M. M. Ghaisas, S. B. Kshirsagar, and R. S. Sahane, “Evaluation of wound healing activity of ferulic acid in diabetic rats,” International Wound Journal, vol. 11, no. 5, pp. 523–532, 2014. View at: Publisher Site | Google Scholar
  100. J. Ren, M. Yang, F. Xu, J. Chen, and S. Ma, “Acceleration of wound healing activity with syringic acid in streptozotocin induced diabetic rats,” Life Sciences, vol. 233, p. 116728, 2019. View at: Publisher Site | Google Scholar
  101. Q. Chen, W. Li, J. Wang, X. Qu, and G. Wang, “Lysozyme-antimicrobial peptide fusion protein promotes the diabetic wound size reduction in streptozotocin (STZ)-induced diabetic rats,” Medical science monitor : international medical journal of experimental and clinical research, vol. 24, pp. 8449–8458, 2018. View at: Publisher Site | Google Scholar
  102. D. Bagdas, B. C. Etoz, Z. Gul et al., “In vivo systemic chlorogenic acid therapy under diabetic conditions: wound healing effects and cytotoxicity/genotoxicity profile,” Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, vol. 81, pp. 54–61, 2015. View at: Publisher Site | Google Scholar
  103. H. Zhao, J. Huang, Y. Li et al., “ROS-scavenging hydrogel to promote healing of bacteria infected diabetic wounds,” Biomaterials, vol. 258, p. 120286, 2020. View at: Publisher Site | Google Scholar
  104. D. Duscher, A. A. Trotsyuk, Z. N. Maan et al., “Optimization of transdermal deferoxamine leads to enhanced efficacy in healing skin wounds,” Journal of Controlled Release, vol. 308, pp. 232–239, 2019. View at: Publisher Site | Google Scholar
  105. A. F. M. Pessoa, J. C. Florim, H. G. Rodrigues et al., “Oral administration of antioxidants improves skin wound healing in diabetic mice,” Wound Repair and Regeneration, vol. 24, pp. 981–993, 2016. View at: Publisher Site | Google Scholar
  106. G. S. Omenn, G. E. Goodman, M. D. Thornquist et al., “Risk factors for lung cancer and for intervention effects in CARET, the Beta-carotene and retinol efficacy trial,” JNCI: Journal of the National Cancer Institute, vol. 88, no. 21, pp. 1550–1559, 1996. View at: Publisher Site | Google Scholar
  107. J. J. Challem, “Re: risk factors for lung cancer and for intervention effects in CARET, the Beta-carotene and retinol efficacy trial,” Journal of the National Cancer Institute, vol. 89, no. 4, pp. 325-326, 1997. View at: Publisher Site | Google Scholar
  108. V. Mujica, R. Orrego, R. Fuentealba, E. Leiva, and J. Zúñiga-Hernández, “Propolis as an adjuvant in the healing of human diabetic foot wounds receiving care in the diagnostic and treatment centre from the regional hospital of Talca,” Journal Diabetes Research, vol. 2019, article 2507578, 10 pages, 2019. View at: Publisher Site | Google Scholar
  109. M. A. Babizhayev, I. A. Strokov, V. V. Nosikov et al., “The role of oxidative stress in diabetic neuropathy: generation of free radical species in the glycation reaction and gene polymorphisms encoding antioxidant enzymes to genetic susceptibility to diabetic neuropathy in population of type I diabetic patients,” Cell Biochemistry and Biophysics, vol. 71, no. 3, pp. 1425–1443, 2015. View at: Publisher Site | Google Scholar
  110. M. A. Zayed, X. Wei, K. M. Park et al., “N-Acetylcysteine accelerates amputation stump healing in the setting of diabetes,” FASEB Journal, vol. 31, no. 6, pp. 2686–2695, 2017. View at: Publisher Site | Google Scholar

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