Review Article | Open Access
Shilong You, Ying Zhang, Jiaqi Xu, Hao Qian, Shaojun Wu, Boquan Wu, Saien Lu, Yingxian Sun, Naijin Zhang, "The Role of BRG1 in Antioxidant and Redox Signaling", Oxidative Medicine and Cellular Longevity, vol. 2020, Article ID 6095673, 12 pages, 2020. https://doi.org/10.1155/2020/6095673
The Role of BRG1 in Antioxidant and Redox Signaling
Redox homeostasis is regulated by critical molecules that modulate antioxidant and redox signaling (ARS) within the cell. Imbalances among these molecules can lead to oxidative stress and damage to cell functions, causing a variety of diseases. Brahma-related gene 1 (BRG1), also known as SMARCA4, is the central ATPase catalytic subunit of the switch/sucrose nonfermentable (SWI/SNF) chromatin remodeling complex, which plays a core role in DNA replication, repair, recombination, and transcriptional regulation. Numerous recent studies show that BRG1 is involved in the regulation of various cellular processes associated with ARS. BRG1, as a major factor in chromatin remodeling, is essential for the repair of oxidative stress-induced DNA damage and the activation of antioxidant genes under oxidative stress. Consequently, a comprehensive understanding of the roles of BRG1 in redox homeostasis is crucial to understand the normal functioning as well as pathological mechanisms. In this review, we summarized and discussed the role of BRG1 in the regulation of ARS.
Brahma-related gene 1 (BRG1), also known as SMARCA4, is the central catalytic ATPase of the switch/sucrose nonfermentable (SWI/SNF) chromatin remodeling complex, which alters the structure of reconstituted chromatin particles in an ATP-dependent manner and makes genomic regions more accessible to transcription factors and the transcription machinery . As a major factor in chromatin remodeling, BRG1 plays a pivotal role in DNA replication, repair, recombination, and transcriptional regulation by interacting with various nuclear proteins, including nuclear receptors, transcription factors, and chromatin modifying enzymes [2, 3]. Consequently, BRG1 is involved in a range of cellular processes, including cell proliferation, apoptosis, and differentiation [4–6], and is involved in a diversity of diseases, such as cancer , liver fibrosis  and heart disease . Accumulating evidence indicates that BRG1-mediated chromatin remodeling is essential for the repair of oxidative stress-induced DNA damage and the activation of antioxidant genes under oxidative stress [10–13]. In view of the importance of BRG1 in oxidative stress, in this review, we critically discuss the potential role of BRG1 in redox regulation, oxidative stress, and reactive oxygen species- (ROS-) induced disease.
The BRG1 gene is located in chromosomal region 19p13.2 . A gene enrichment analysis of the regions of the genome occupied by BRG1 showed that BRG1 occupied the promoter regions of the hypoxia-inducible factor (HIF)2α transcription factor and of metabolic regulators in several key pathways including the glycolytic pathway . Interestingly, this study also found that oxidative stress-induced BRG1 could bind to the promoter of the antioxidant defense gene and induce its transcription, thus protecting cells from oxidative damage. Sena et al. further reported that BRG1 can promote the expression of HIF1α and HIF2α genes and promote hypoxic induction of a subset of HIF1 and HIF2 target genes to regulate the hypoxia response . HIF1α, HIF2α, and many other key metabolic regulators are major regulators of survival pathways activated by various cellular stresses (such as hypoxia) [17, 18]; therefore, it is reasonable to assume that BRG1 also plays a key role in regulating oxidative stress. Moreover, recent studies showed that BRG1 overexpression mitigated hypoxia-induced cell damage, while BRG1 suppression contributed to hypoxia-induced cell damage . Taken together, these studies suggest that BRG1 is involved in oxidative stress and may have an antioxidant effect.
3. BRG1 and Oxidative Stress
Redox species, the primary forms of which include ROS and reactive nitrogen species (RNS), have dual roles in living systems, having beneficial or deleterious effects . Normal levels of redox species are essential to trigger many important reactions and signaling cascades . However, when produced in excess or combined with other redox species, they can have serious deleterious effects on cellular function (reviewed in references [22, 23]), which can be counteracted by enzymatic and nonenzymatic antioxidant systems. The delicate balance between the beneficial and deleterious effects of redox species, known as redox homeostasis, is achieved through a series of regulatory mechanisms and is an important aspect of healthy organisms . Imbalanced redox homeostasis caused by inappropriate biochemical reactions in cells and/or external factors may result in oxidative stress , which is a pivotal cause of many diseases, such as cancer , cardiovascular disease , neurodegenerative diseases , and diabetes .
Numerous studies show that oxidative stress can induce DNA damage, leading to single- or double-strand breaks, which can be fatal to cells if not repaired . The most common lesion generated by intracellular oxidative stress is 8-hydroxydeoxy guanosine (8-oxodG) . During oxidative stress, the processing and repair of 8-oxodG in nucleosomes requires ATP-dependent chromatin remodeling . BRG1, as a major factor in chromatin remodeling, takes part in protecting against DNA damage induced by oxidative stress and regulating redox homeostasis. Moreover, the formation of BRG1-promoter complexes in response to oxidative stress is essential to protect antioxidant gene promoters from oxidative damage . The specific mechanisms by which BRG1 chromatin remodeling complexes mediate these redox and antioxidant signals are a current focus of research. Therefore, below, we discuss the diverse ways that BRG1 and ARS molecules associate and how this knowledge can be applied to the treatment of related diseases.
4. BRG1 in Oxidative Stress Signaling
Accumulating evidence associates ARS events with the BRG1 chromatin remodeling complex. The relationship between ARS events and BRG1 is complex and multifaceted, involving multiple mechanisms that regulate antioxidant and redox signaling pathways and that affect redox homeostasis. Below, we categorically describe the regulation of BRG1 in redox signaling and its role in oxidative stress-mediated diseases.
4.1. BRG1 in Keap1/Nrf2 Signaling
One of the most studied transcription factors activated by oxidative stress is nuclear factor E2-related factor 2 (Nrf2), which is responsible for inducing the expression of several antioxidant defense genes and is the main regulator of cellular defense against oxidative stress . In response to oxidative stress, Nrf2 is activated by dissociation from the inhibitor Kelch-like ECH-associated protein-1 (Keap1) and transferred into the nucleus, where it binds to the antioxidant reaction element (ARE), thereby promoting the expression of antioxidant genes, such as heme oxygenase-1 (HO-1) and signal transducer and activator of transcription 3 (STAT3) .
4.1.1. BRG1 in Keap1/Nrf2/HO-1 Signaling
Early studies showed that Nrf2 binding to AREs requires BRG1 recruitment to induce HO-1 gene activation. Hyperphosphorylation of BRG1 prevents HO1-induced oxidative damage and is considered to be a key mechanism of darinaparsin-induced apoptosis . Upon oxidative stress, BRG1 interacts with Nrf2 to activate HO-1 gene expression by promoting the formation of Z-DNA and subsequently recruiting RNA polymerase II to the promoter of HO-1 [34, 35]. Therefore, activation of HO-1 by the interaction between BRG1 and Nrf2 may be a key regulatory checkpoint in the regulation of disease states caused by oxidative stress.
BRG1-mediated Nrf2/HO-1 signaling has been reported in diverse pathological processes. The expression of BRG1 was significantly decreased in the myocardium of diabetic rats, which was at least partly related to the decreased expression of HO-1 and impaired diastolic function . Similarly, the depletion of BRG1 caused by high blood sugar significantly blocked the cardioprotective effects of sevoflurane postconditioning, or emulsified isoflurane postconditioning, because of impaired Nrf2/HO-1 signaling [37, 38]. Furthermore, adiponectin promotes HO-1 expression by simultaneously activating Nrf2 and BRG1, thereby inhibiting hyperglycemic-induced oxidative stress, myocardial cell apoptosis, cardiac hypertrophy, and cardiac dysfunction . These studies may provide a new way to treat diabetic cardiomyopathy.
BRG1-mediated Nrf2/HO-1 transcriptional activation is important for oxidative stress injury induced by ischemia/reperfusion (I/R) or hypoxia/reoxygenation (H/R). Propofol alleviates oxidative stress in anoxia/reoxygenated hepatocytes through the lncRNA-TUG1/BRG1 pathway . Knockdown of BRG1 inhibited HO-1 expression, thereby weakening the protective effect of propofol postconditioning on hepatic ischemia/reperfusion injury (HIRI) . Consistent with these results, overexpression of BRG1 alleviates hepatic I/R injury by activating the Nrf2/HO-1 signaling pathway . Furthermore, under BRG1 overexpression, the upregulation and nuclear translocation of Nrf2 alleviates acute lung injury caused by hepatic I/R via activation of the antioxidant enzyme system, including NAD (P) H quinone dehydrogenase 1 (NQO1), superoxide dismutase (SOD), glutamate-cysteine ligase catalytic subunit (GCLC), and glutathione S-transferase alpha 1 (GSTα1) . This suggests that BRG1 may also play a key role in promoting the activation and expression of antioxidant enzymes.
Deng et al. found that under oxidative stress, the number of damaged and dead neurons in BRG1 knockout (KO) mice increased significantly, which may be related to the regulation of NR2B-NR2A by BRG1 . Overexpression of BRG1 increases the activity of neurons, weakens apoptosis, and reduces the production of ROS, thus producing a protective effect on oxygen-glucose deprivation/reoxygenation- (OGD/R-) induced injury . Additionally, further evidence indicates that inhibition of miR-144-3p or miR-199a-5p can alleviate OGD/R-induced neuronal injury by upregulating BRG1 to activate Nrf2/HO-1 signaling [46, 47].
From the above studies, it can be inferred that BRG1 can protect tissues from I/R-, H/R-, or OGD/R-induced oxidative injury through Keap1/Nrf2/HO-1 signal transduction (Figure 1). BRG1 is therefore a potential target for the treatment of I/R-, H/R-, or OGD/R-induced injury. Paradoxically, Naito et al. suggested that BRG1, in ischemic stress, induces tumor necrosis factor-α (TNF-α) expression (TNF-α promotes the production of ROS, reviewed in reference ) in renal epithelial cells, exacerbating renal injury . Furthermore, Liu et al. reported that BRG1 regulated endodermal IL-33, which aggravated renal injury and fibrosis induced by ischemia-reperfusion in mice . Therefore, the role of BRG1 in ischemia-reperfusion is controversial and deserves further study.
4.1.2. BRG1 in Keap1/Nrf2/STAT3 Signaling
Myocardial STAT3 is a crucial transcription factor in the SAFE pathway (i.e., Janus kinase (JAK)2/STAT3 signaling cascade), especially during myocardial ischemia reperfusion injury . STAT3 restores the expression of endothelial nitric oxide synthase (eNOS) and maintains the transcription of eNOS in endothelial cells to cope with hypoxia injury . Upon exposure to oxidative stress, BRG1 interacts with Nrf2 and subsequently participates in Nrf2-mediated STAT3 gene activation . BRG1 also provides protection against ROS-induced cardiomyopathy by activating STAT3 . Furthermore, a study by Wang et al. showed that the cardiac protective effect of emulsified isoflurane postconditioning was lost in diabetic rats because of impaired Nrf2/STAT3 signal transduction . These results indicate that BRG1 plays a vital role in antioxidant damage through Keap1/Nrf2/STAT3 signaling (Figure 1).
4.2. BRG1 in Other ROS-Mediated Signaling Pathways
In addition to the Keap1/Nrf2 signaling pathway, BRG1 is involved in a number of other ROS-mediated pathways that are closely related to oxidative stress.
4.2.1. BRG1 in NF-κB and p65 Signaling
There is a strong mutual relationship between ROS and nuclear factor kappa B (NF-κB) signaling. ROS affects activation of NF-κB signaling mainly by inhibiting the phosphorylation of IκBα. In turn, NF-κB signaling can also affect ROS levels by upregulating the expression of antioxidant proteins, such as SOD and glutathione peroxidase (GPX) [54, 55]. Moreover, p65 exacerbates hypoxia stress-mediated endothelial cells . Under hypoxia, p65 at least partially induces endothelial dysfunction by activating a series of cell adhesion molecule (CAM) genes . Fang et al. showed that BRG1 and Brahma (BRM) interact with NF-κB/p65 and fine-tune the binding of p65 to target promoters, which indicates a strong correlation between BRG1 and oxidative stress signals related to ROS  (Figure 2).
4.2.2. BRG1 in p53 and PTEN/PI3K-AKT Signaling
p53 is the main modulator of a cell’s response to various stresses, including oxidative stress. Under physiological conditions or exposure to transient and mild oxidative stress, p53 has an antioxidant function and contributes to maintaining low levels of ROS (reviewed in reference ). Phosphatase and tensin homolog (PTEN)/phosphatidylinositol 3-kinase (PI3K)-AKT signaling also mediates ROS damage to cells [60, 61]. Notably, BRG1 has a direct effect on p53  and may inhibit the expression of PTEN at mRNA and protein levels, thereby upregulating the PI3K-AKT signaling pathway [63, 64] (Figure 2). These results further support the important role of BRG1 in the regulation of oxidative stress.
4.2.3. BRG1 in SHH Signaling
The Sonic hedgehog (SHH) signaling pathway protects cell homeostasis by regulating antioxidant defense mechanisms and maintaining mitochondrial dynamics to resist oxidative stress . BRG1 is required for the transcriptional activation of Gli in the SHH pathway . Moreover, SHH, activated by BRG1-recruited NF-κB, can in turn activate BRG1 expression through Gli to sustain a positive feedback loop  (Figure 2). The relationship between BRG1 and SHH signaling may be an important basis for BRG1 to participate in the regulation of redox homeostasis.
4.2.4. BRG1 in TGF-β and WNT Signaling
The level of ROS is closely related to the transforming growth factor beta (TGF-β)  and WNT signaling pathways . Importantly, BRG1 not only enhances TGF-β signaling as a cofactor of SMADs , but also participates in the WNT pathway by controlling the bioavailability of signaling molecules (such as ligands, receptors, and signal adapters) and by directly activating the target gene, β-catenin [71, 72] (Figure 2). Therefore, BRG1 may be involved in the management of redox signals by regulating TGF-β signaling and WNT signaling.
In short, BRG1 can affect intracellular ROS levels by participating in a number of ROS-related signaling pathways. However, the specific mechanism by which BRG1 influences the redox signal through these pathways needs to be clarified. Further investigation is expected to reveal many new roles of BRG1 in redox homeostasis.
4.3. BRG1 and Mitochondrial Function
It has been established that more than 90% of ROS are generated by mitochondria in eukaryotic cells . Mitochondrial dysfunction is one of the main reasons for the accumulation of ROS and oxidative-damaged proteins in cells . BRG1 takes part in mitochondrial oxidative pathways and therefore affects the production of ROS. During the heat shock response, BRG1 recruited by heat shock factor 1 (HSF1) helps to maintain mitochondrial membrane potential and cell survival by activating transcription of the gene encoding mitochondrial chaperone, such as heat-shock protein (HSP) 60, HSP10, and mtHSP70 . BRG1 and BRM can maintain cardiomyocyte homeostasis in vivo by regulating mitochondrial dynamics and mitotic phagocytosis. In the BRG1-BRM double-knockout mouse heart, mitochondria were small and fragmented, with a decrease in both number and size .
Increased mitochondrial respiration was observed in BRG1-deficient tumor cells. This was because the expression of several important genes in the oxidative phosphorylation (OXPHOS) pathway increased, including the master mitochondrial biogenesis coactivator, PGC1-α, mitochondrial ATP synthase F0 complex subunit (ATP5L), and oxidative stress response genes, such as glutathione S-transferase omega 7 (GSTO7) and GSTO1. The level of several metabolites that play a key role in the pentose-phosphate pathway (PPP) was also elevated . It is worth noting that, under hypoxic conditions, mitochondrial complex I (CI) dysfunction causes high levels of ROS, triggering a signal transduction pathway involving BRG1 downregulation . Furthermore, deletion of BRG1 caused a significant upregulation in the expression of genes related to mitochondrial degradation, which may lead to an imbalance in redox homeostasis .
In general, these studies indicate that BRG1 plays an active role in protecting mitochondrial function and that BRG1 may protect organisms from metabolic damage through mechanisms that depend on oxidative stress (Figure 1).
4.4. BRG1 and ER Stress
Accumulation of unfolded and misfolded proteins or excessive protein transport in the endoplasmic reticulum (ER) can cause ER stress and trigger the unfolded protein response (UPR). UPR is modulated by the ER and the redox system in the ER . In the presence of ER stress, the UPR uses evolutionarily conserved signaling pathways to restore normal cell function and inhibit apoptosis, which are necessary and sufficient to alleviate protein aggregation and ER stress . BRG1 maintains the basal level of inositol-requiring enzyme 1 (Ire1) activity by reducing oxidative stress in the ER network, which promotes UPR regulation and the clearance of cytoplasmic protein aggregates to maintain ER homeostasis . These data indicate that BRG1 plays a critical role in oxidative stress by maintaining ER homeostasis (Figure 1).
4.5. BRG1 and Autophagy
Autophagy, a lysosomal degradation pathway, is responsible for the removal of aggregation-prone proteins, the disposal of excessive or damaged organelles, and the renewal of long-lived proteins, to achieve the metabolic needs of the cell and the turnover of certain organelles . Autophagy is believed to be the main mechanism for removing oxidized proteins from cells , and impaired autophagy causes oxidative stress . The transcription of central autophagy regulatory genes, such as Atg16l1, Ambra1, Atg7, and Wipi2, was directly modulated by BRG1. Autophagy defects in BRG1-deficient intestinal epithelial cells (IECs) lead to overproduction of ROS, resulting in a defect of barrier integrity . Therefore, it is reasonable to believe that BRG1 participates in redox signaling by regulating autophagy (Figure 3).
4.6. BRG1 and NOX
ROS play a wide range of physiological and pathophysiological roles in various processes. The production of ROS is catalyzed by a group of specialized enzyme families, of which the NADPH oxidase (NOX) family is the most studied [87, 88]. Since its discovery in the late 1970s , NOX—as a main source of ROS production—has been demonstrated to be involved in a variety of ROS-mediated physiological and pathophysiological processes .
NOX4-catalyzed ROS generation in endothelial cells promotes tissue fibrosis by directing endothelial cells toward a myofibroblast-like phenotype in a process known as endothelial-mesenchymal transition . A very recent study by Li et al. showed that BRG1 interacts with KDM3A to activate NOX (1, 2, 4) transcription in endothelial cells. Endothelial-derived ROS, generated by increased NOX expression, may promote cardiac ischemia-reperfusion injury . Similarly, Liu et al. reported that BRG1 relied on lysine acetyltransferase 8 (KAT8) to activate the transcription of NOX genes (NOX1, NOX2, and NOX4), to promote intracellular ROS production in a mouse model of nonalcoholic steatohepatitis . Moreover, according to Li et al., BRG1 interacts with SMAD3 and AP-1 to upregulate histone demethylase JMJD2B, histone acetyltransferase p300, and ASH2 (a key regulatory subunit of the H3K4 methyltransferase complex), which mediates TGF-β-induced transcription of NOX4 in endothelial cells and stimulates the production of ROS, to promote endothelial-mesenchymal transition and liver fibrosis .
In general, BRG1 regulates NOX transcription to promote ROS production and aggravate oxidative stress-induced damage. However, these observations are contradictory to a series of findings that suggest BRG1 protects against oxidative damage. It is of high interest to explain the dual role of BRG1 in oxidative stress.
4.7. BRG1 and eNOS
Under normal physiological conditions, eNOS is the main source of nitric oxide (NO) in the vascular system . However, instead of producing NO, dysfunctional eNOS can produce a superoxide anion radical (O2−), resulting in decreased NO bioavailability and increased oxidative stress, causing and exacerbating endothelial dysfunction [96, 97]. Fish et al. reported that BRG1 helped to restore eNOS expression during the anoxia/reoxygenation cycle by preventing the ejection of acetylated H3 and H4 histones on eNOS promoters in endothelial cells . It can be inferred that BRG1 protected endothelial function under oxidative stress by restoring eNOS expression. In contrast, Shao et al. found that endothelial BRG1 limited eNOS activity and NO bioavailability by activating caveolin-1 (CAV1) transcription, contributing to thioacetamide-induced liver fibrosis in mice  (Figure 3). Hence, the exact effect of BRG1 on eNOS expression and activity needs further study.
4.8. BRG1 and MTs
Metallothioneins (MTs), encoded by MT genes, are a group of low molecular weight, cysteine-rich metal-binding proteins that act as antioxidants to prevent DNA damage and apoptosis by maintaining intracellular metal homeostasis and redox balance [99, 100]. Through a chromatin immunoprecipitation assay, Datta et al. revealed that ATP-dependent chromatin remodeling of BRG1 produced a significant inhibitory effect on MT-1 promoter activity in mouse lymphosarcoma cells . Therefore, BRG1 may play a key role in the regulation of antioxidant molecules, even if not by direct regulation of BRG1 itself.
BRG1 plays an important role in redox regulation and regulating cellular homeostasis by establishing specific gene expression patterns and maintaining the transcriptional state. The maintenance of redox homeostasis is required for various feedback mechanisms, mainly related to transcriptional modulation, to function at different levels. As discussed above and summarized in Figure 4, BRG1 regulates many of the pivotal genes and molecules related to redox homeostasis and oxidative stress. The majority of studies show that BRG1 protects cells from oxidative stress damage by promoting the formation of antioxidants, or suppressing the production of ROS, or both. However, a minority of studies show that BRG1 aggravates oxidative stress damage by inducing ROS generation. Overall, the obvious protective effects of BRG1 against oxidative stress damage support the theory that BRG1 synergistically maintains cellular homeostasis via distinct mechanisms. This may provide the mechanistic basis for the development and discovery of antioxidants and BRG1 regulators for the management of oxidative stress-related diseases. Tables 1 and 2 summarize BRG1 regulators and their known actions. Further in-depth studies are required to identify and clarify the exact roles and the dual function of BRG1 in regulating redox homeostasis. Further research addressing these issues, with focus on BRG1 as a drug target, may provide therapeutic strategies for the treatment of cancer, ischemia-reperfusion injury, and other redox-related diseases.
Conflicts of Interest
The authors declare that there is no conflict of interest regarding the publication of this paper.
This work was supported by the National Natural Science Foundation of China (Grant nos. 81670231, 81900355, 81900372, and 81970211) and “China Postdoctoral Science Foundation” (Grant nos. 2019M661159 and 2018M641730).
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