PPAR Research

PPAR Research / 2016 / Article

Research Article | Open Access

Volume 2016 |Article ID 2756781 | https://doi.org/10.1155/2016/2756781

G. Chinetti-Gbaguidi, C. Copin, B. Derudas, N. Marx, J. Eechkoute, B. Staels, "Peroxisome Proliferator-Activated Receptor γ Induces the Expression of Tissue Factor Pathway Inhibitor-1 (TFPI-1) in Human Macrophages", PPAR Research, vol. 2016, Article ID 2756781, 9 pages, 2016. https://doi.org/10.1155/2016/2756781

Peroxisome Proliferator-Activated Receptor γ Induces the Expression of Tissue Factor Pathway Inhibitor-1 (TFPI-1) in Human Macrophages

Academic Editor: Nanping Wang
Received14 Sep 2016
Accepted28 Nov 2016
Published27 Dec 2016

Abstract

Tissue factor (TF) is the initiator of the blood coagulation cascade after interaction with the activated factor VII (FVIIa). Moreover, the TF/FVIIa complex also activates intracellular signalling pathways leading to the production of inflammatory cytokines. The TF/FVIIa complex is inhibited by the tissue factor pathway inhibitor-1 (TFPI-1). Peroxisome proliferator-activated receptor gamma (PPARγ) is a transcription factor that, together with PPARα and PPARβ/δ, controls macrophage functions. However, whether PPARγ activation modulates the expression of TFP1-1 in human macrophages is not known. Here we report that PPARγ activation increases the expression of TFPI-1 in human macrophages in vitro as well as in vivo in circulating peripheral blood mononuclear cells. The induction of TFPI-1 expression by PPARγ ligands, an effect shared by the activation of PPARα and PPARβ/δ, occurs also in proinflammatory M1 and in anti-inflammatory M2 polarized macrophages. As a functional consequence, treatment with PPARγ ligands significantly reduces the inflammatory response induced by FVIIa, as measured by variations in the IL-8, MMP-2, and MCP-1 expression. These data identify a novel role for PPARγ in the control of TF the pathway.

1. Introduction

Macrophages are heterogeneous cells displaying a spectrum of functional phenotypes ranging from M1 proinflammatory to M2 anti-inflammatory, depending on their microenvironment [1]. Macrophages play crucial roles in the pathogenesis of atherosclerosis. Indeed, within the atherosclerotic plaque, macrophages control the inflammatory response, lipid handling (cholesterol accumulation, trafficking, and efflux) and efferocytosis [24]. Moreover, macrophages are also involved in atherosclerotic plaque thrombogenicity by their ability to produce both tissue factor (TF) and its natural inhibitor TFPI-1 [5, 6].

TF is a transmembrane glycoprotein member of the cytokine receptor superfamily acting as the key factor in the initiation of the blood coagulation cascade [7]. TF is expressed by endothelial cells and monocytes/macrophages after stimulation with oxidized low-density lipoproteins, lipopolysaccharide (LPS), or tumor necrosis factor (TNF)α [8]. Inappropriate expression of TF within the vasculature upon atherosclerotic plaque rupture leads to interaction with circulating FVIIa resulting in the formation of the TF/FVIIa complex that initiates the extrinsic coagulation pathway through a cascade of enzymatic reactions driving the conversion of FX to FXa and the production of thrombin, ultimately leading to thrombosis [9].

Beside its functions in haemostasis, the TF/FVIIa complex also plays a major role in cell migration, metastasis, and angiogenesis, probably through intracellular signalling events [10, 11]. Indeed, the TF/FVIIa complex leads to the generation of proinflammatory cytokines, such as IL-6 and IL-8 [12, 13]. The TF/FVIIa-mediated extrinsic coagulation pathway is inhibited by the tissue factor pathway inhibitor-1 (TFPI-1), a Kunitz-type inhibitor which prevents generation of FXa [8]. TFPI-1 is mainly synthesized by vascular endothelium and macrophages and is also present in plasma as free form or associated with lipoproteins or platelets [8]. The imbalance between TF and TFPI-1 ratio will thus impact both the TF/FVIIa-mediated coagulation and inflammation.

The peroxisome proliferator-activated receptor gamma (PPARγ), together with PPARα and PPARβ/δ, belongs to a family of transcription factors expressed in macrophages where they control the inflammatory response, cholesterol metabolism, and phagocytosis [14, 15]. PPARs also regulate macrophage thrombogenicity; indeed, PPARα ligands reduce LPS-induced expression of TF [16, 17] whereas the role of PPARγ in the control of TF expression is less clear; in some reports PPARγ is described as having no effect [17] while others showed PPARγ to decrease TF expression [18]. However, no data are available regarding the regulation of TFPI-1 expression by PPARγ in human macrophages.

2. Materials and Methods

2.1. Cell Culture

Monocytes were isolated by density gradient centrifugation from healthy volunteers and differentiated into macrophages by 7 days of culture in RPMI1640 medium (Invitrogen, France) supplemented with gentamicin (40 μg/mL), L-glutamine (2 mM) (Sigma-Aldrich, France), and 10% human serum (Abcys, France) [19]. M2 macrophages were obtained by differentiating monocytes in the presence of human IL-4 (15 ng/mL, Promocell, Germany), while M1 macrophages were obtained by activating differentiated macrophages with LPS (100 ng/mL, 4 h) [20]. Where indicated, synthetic ligands for PPARγ (GW1929, 600 nM or rosiglitazone, 100 nM), for PPARα (GW647, 600 nM), and for PPARβ/δ (GW1516, 100 nM) were added for 24 h to differentiated macrophages. Some experiments were performed on differentiated macrophages which were activated for 24 h with GW1929 (600 nM), washed, and subsequently treated in the absence or in the presence of activated FVII (FVIIa, 10 nM, Cryoprep) for further 24 h.

2.2. RNA Extraction and Analysis

Total cellular RNA was extracted using Trizol (Life Technologies, France). RNA was reverse transcribed and cDNAs were quantified by Q-PCR on a MX3000 apparatus (Stratagene) using specific primers (Table 1). mRNA levels were normalized to those of cyclophilin. The relative expression of each gene was calculated by the ΔΔCt method, where ΔCt is the value obtained by subtracting the Ct (cycle threshold) value of cyclophilin from the Ct value of the target gene. The amount of target relative to the cyclophilin mRNA was expressed as .


GeneForwardReverse

TFPI-1AGA TGG TCC GAA TGG TTT CCATC CTC TGT CTG CTG GAG TGA G
IL-8CCA CCC CAA ATT TAT CAA AGA ACAG ACA GAG CTC TCT TCC ATC A
MCP-1TCA TAG CAG CCA CCT TCA TTC CGGA CAC TTG CTG CTG GTG ATT C
MMP-2TAT TTG ATG GCA TCG CTC AGGCC TCG TAT ACC GCA TCA AT
TFATG TGA AGC AGA CGT ACT TGG CAC G
ATT GTT GGC TGT CCG AGG TTT GTC
CyclophilinGCA TAC GGG TCC TGG CAT CTT GTC CATG GTG ATC TTC TTG CTG GTC TTG C

2.3. In Vivo Study

Forty nondiabetic patients after coronary stent implantation were treated with pioglitazone (30 mg daily for 8 weeks) (Supplemental Table  1 available online at http://dx.doi.org/10.1155/2016/2756781) [21]. RNA was extracted from peripheral blood mononuclear cells (PBMC) using the Paxgene Blood RNA system at both the beginning of the study and at eight-week follow-up.

2.4. Protein Extraction and Western Blot Analysis

After washing in cold PBS, cells were harvested in cold lysis buffer (RIPA). Cell homogenates were collected by centrifugation and protein concentrations determined using the BCA assay (Pierce Interchim). Protein lysate (20 μg) was resolved by 10% SDS-PAGE, transferred to nitrocellulose membranes (Amersham), and then revealed with rabbit monoclonal antibody against TFPI-1 (Abcam) or goat polyclonal antibody against β-actin (Santa Cruz Biotechnology). After incubation with a secondary peroxidase-conjugated antibody (Santa Cruz Biotechnology), immunoreactive bands were revealed by chemiluminescence ECL detection kit (Amersham) and band intensity was quantified using the Quantity One software.

2.5. Measurement of TFPI-1 and MCP-1 Secretion by ELISA

Amounts of TFPI-1 protein were measured in culture media of macrophages treated for 24 h with GW1929 (600 nM) in the absence or in the presence of unfractionated heparin (1 U/mL, Sanofi Aventis, added 1 h before medium collection) [22], using the human TFPI Quantikine ELISA kit (R&D systems). MCP-1 secretion was measured by ELISA (Peprotech, France) according to the manufacturer’s instructions.

2.6. Measurement of TFPI-1 Specific Activity

TFPI-1 specific activity was measured using the Actichrome TFPI activity assay (American Diagnostica) following the manufacturer’s instructions in culture medium of cells treated or not for 24 h with GW1929 (600 nM).

2.7. Short-Interfering (si)RNA Transfection and Adenoviral Infection

Differentiated RM macrophages were transfected with siRNA specific for human PPARγ and nonsilencing control scrambled siRNA (Ambion), using the transfection reagent DharmaFECT4 (Dharmacon). After 16 h, cells were incubated with GW1929 (600 nM) or vehicle (DMSO) and harvested 24 h later. For adenoviral infection, macrophages were infected with recombinant adenovirus coding for GFP (Green Fluorescent Protein, Ad-GFP) or for PPARγ (Ad-PPARγ) as described [23, 24]. After 16 h of infection, cells were incubated for further 24 h in the absence or in the presence of rosiglitazone (Rosi, 100 nM).

2.8. ChIP-seq Data Processing and Analysis

Chromatin immunoprecipitation followed by high-throughput sequencing (ChIP-seq) was performed to monitor H3K9ac levels in M2 macrophages using an antibody against H3K9ac (Millipore (17-658)) [25]. ChIP-seq data were mapped to Hg18 and signals were normalized to the total number of tags before visualization using the Integrated Genome Browser (IGB) [26]. PPARγ ChIP-seq data from human primary adipocytes were obtained from [27] and PPARγ response elements (PPRE) were searched using Dragon PPAR Response Element (PPRE) Spotter v.2.0 (http://www.cbrc.kaust.edu.sa/ppre/).

2.9. Statistical Analysis

Statistical differences between groups were analyzed by Student’s -test and considered significant when .

3. Results

3.1. PPARγ Activation Increases the Expression and Secretion of TFPI-1 in Primary Human Macrophages

To investigate whether PPARγ activation regulates TFPI-1 expression, peripheral blood mononuclear cells (PBMC), a cell population including circulating monocytes, were isolated from patients before and after pioglitazone administration. Interestingly, pioglitazone treatment significantly increased the expression of TFPI-1 mRNA in PBMC (Figure 1).

Moreover, activation of human primary differentiated macrophages with the synthetic PPARγ ligands GW1929 and rosiglitazone (Rosi) resulted in the induction of TFPI-1 gene expression in a time and dose-dependent manner (Figures 2(a) and 2(b)). This regulation also occurred at the protein level in macrophages treated for 24 h or 48 h with GW1929 (600 nM) (Figure 2(c)). Induction of TFPI-1 gene expression was also observed upon PPARβ/δ and PPARα activation by GW1516 and GW647 ligands, respectively (Supplemental Figure 1). Moreover, culture media TFPI-1 concentration was increased by PPARγ activation with GW1929 both in the absence as well as in the presence of heparin, a factor known to enhance TFPI-1 release [22] (Figure 2(d)). However, TFPI-1 specific activity was not modified by PPARγ activation in human macrophages (Supplemental Figure 2). Taken together these data indicate that PPARγ activation in human macrophages increases expression and release of TFPI-1 without modifying its activity.

3.2. PPARγ Activation Induces TFPI-1 Gene Expression Both in M1 and M2 Human Macrophages

Since macrophages can present different functional phenotypes related to the microenvironment [1], the effects of PPARγ activation by GW1929 were studied in nonpolarized macrophages (RM) as well as in M1 proinflammatory and in M2 anti-inflammatory macrophages. The basal expression level of TFPI-1 was significantly higher in M2 macrophages compared to both RM and M1 macrophages (Figure 3). Moreover, PPARγ activation significantly induced TFPI-1 gene and protein expression in all the three different macrophage subtypes (Figure 3).

3.3. PPARγ Ligands Regulate the TFPI-1 Expression in a PPARγ-Dependent Manner

In support of a direct regulation of TFPI-1 gene expression by PPARγ, we found that active regulatory regions encompassing or localized near the promoter of this gene, identified through enrichment for histone H3 lysine 9 acetylation (H3K9ac) in M2 macrophages, comprise putative PPARγ-response elements (PPRE) and recruit PPARγ in human adipocytes, a cell-type where it is highly expressed (Figure 4(a)). In order to confirm that TFPI-1 regulation induced by GW1929 treatment is due to PPARγ, experiments were performed in macrophages after modulation of PPARγ expression levels. The induction of TFPI-1 gene expression by GW1929 treatment was significantly reduced in the presence of the PPARγ siRNA (Figure 4(b)). Complementary gain of function experiments using an adenovirus coding for PPARγ (Ad-PPARγ) showed that the induction of TFPI-1 gene expression by the PPARγ ligand rosiglitazone was significantly enhanced in Ad-PPARγ-infected macrophages, compared to Ad-GFP infected cells used as control (Figure 4(c)). These results indicate that both GW1929 and rosiglitazone activate TFPI-1 expression in a PPARγ-dependent manner.

3.4. PPARγ Activation Blocks the FVIIa-Induced Inflammatory Response in Human Macrophages

To determine the potential biological significance of TFPI-1 induction by PPARγ and given that TF/FVIIa complex can enhance an inflammatory response [12, 13], experiments were performed in macrophages treated with GW1929 (600 nM for 24 h), washed, and subsequently stimulated with FVIIa (10 nM). FVIIa induced gene expression of MMP-2, IL-8, and MCP-1, all proinflammatory molecules (Figures 5(a)5(c)). Interestingly, treatment of macrophages with GW1929 (600 nM) significantly blocked the proinflammatory response mediated by FVIIa (Figures 5(a)5(c)). Incubation with GW1929 also decreased FVIIa-induced secretion of MCP-1 (Figure 5(d)). These data suggest that PPARγ activation can counteract the proinflammatory effects mediated by TF/FVIIa complex, the TF being expressed by macrophages [5], likely through the increase of TFPI-1 expression. Indeed, the TF/TFPI-1 ratio was significantly reduced in the presence of the PPARγ agonist (Supplemental Figure 3), thus corroborating that PPARγ activation blocks the FVIIa-induced inflammatory response.

4. Discussion

TF and FVIIa are key components of the coagulation cascade that lead to the formation of a fibrin clot. Within atherosclerotic plaque rupture this provokes thrombus generation, one of the major causes of acute ischemic syndromes such as myocardial infarction [28]. The TF/FVIIa complex has however other potential roles, since it is involved in mediating cell migration and metastasis as well as angiogenesis [29]. Indeed, TF/FVIIa can induce the production of proinflammatory cytokines and factors in keratinocytes and cancer cells [12, 13, 30].

The TF/FVIIa actions are blocked by the natural inhibitor TFPI-1. The presence of TFPI-1 has been reported in human atherosclerotic lesions where it is expressed by macrophages in areas physically close to those expressing TF and FVIIa [6]. This suggests that also in vivo, in human atherosclerotic plaques, TFPI-1 controls the TF-driven coagulation pathways as well as the thrombogenicity and can prevent complications associated with plaque rupture. However, an imbalanced expression of TF and TFPI-1 in atherosclerotic plaques can have consequences in thrombus formation as well as in inflammation.

Whether the transcription factor PPARγ controls the TF-activated pathway as well as the expression of its inhibitor TFPI-1 has been matter of different studies leading to contradictory results. While it has been first reported that PPARγ activation has no effect on LPS-induced TF expression in macrophages [17], other studies have shown an inhibitory effect by a mechanism involving the interference with the AP1 signalling pathway [18]. Moreover, expression of TFPI-1 has been shown to be induced by rosiglitazone in smooth muscle cells but not in THP1 macrophage cell line [18]. Here, we provide evidence that PPARγ activation enhances gene, protein expression and release of TFPI-1 in human primary differentiated macrophages without affecting its specific activity. Interestingly, PPARγ activation by pioglitazone treatment significantly increased the expression of TFPI-1 in PBMC, a heterogeneous cell population including circulating monocytes, thus suggesting that PPARγ activation regulates TFPI-1 expression also in vivo. We have also demonstrated that the induction of TFPI-1 expression upon PPARγ activation occurs in M1 proinflammatory as well as in M2 anti-inflammatory polarized macrophages. Moreover, we found that the basal expression level of TFPI-1 is higher in M2 macrophages compared to both unpolarized and M1 macrophages, suggesting that these M2 macrophages can play a major role in the control of plaque thrombosis and fibrin deposition. These data, generated in monocyte-derived macrophages isolated from healthy volunteers, are in agreement with those obtained in M2 macrophages isolated from atherosclerotic patients, in which the gene expression level of TFPI-1 is also higher in M2 compared to M1 macrophages [31]. The higher expression of TFPI-1 in M2 macrophages could thus contribute to their suggested beneficial role in plaque stabilization [32, 33].

Interestingly, in a rat carotid balloon injury model in vivo, characterized by increased neointima formation and TF overexpression, rosiglitazone injection enhances the expression of TFPI-1 protein in the injured arteries [18]. However, in vitro treatment of human atheroma specimens with rosiglitazone results in a reduced expression of TFPI-1 protein while treatment with pioglitazone led to an increased TFPI-1 expression [34]. These discrepant effects can be explained by the action of PPARγ on other cellular components of the atherosclerotic plaques. Moreover, they have been obtained using high concentrations of the ligands (10 μM for rosiglitazone and 5 μM for pioglitazone, resp.) [34] that cannot guarantee a specificity of action over PPARγ activation [35]. The induction of TFPI-1 expression upon stimulation by rosiglitazone and the GW1929 compounds in human macrophages are dependent on PPARγ as demonstrated here in PPARγ silencing or overexpression experiments.

Finally, we report that PPARγ preactivation of macrophages significantly reduced the FVIIa-driven inflammatory response, an effect that can be mediated at least partially by the induced TFPI-1 production by PPARγ.

5. Conclusions

In conclusion, we describe a novel function for PPARγ in human macrophages in the control of the TF pathway via the induction of TFPI-1 expression, a regulation that can impact both the thrombogenicity of the atherosclerotic plaques as well as the inflammatory status induced by the TF/FVIIa complex.

Disclosure

B. Staels is a member of the Institut Universitaire de France.

Competing Interests

The authors declare that they have no competing interests.

Acknowledgments

This work was supported by grants from the Fondation de France, the Fondation pour la Recherche Médicale (DPC2011122981), the Agence Nationale de la Recherche (AlMHA project), and the “European Genomic Institute for Diabetes” (EGID, ANR-10-LABX-46).

Supplementary Materials

Supplemental Table 1. Baseline parameters of patients. Data are mean ± SD, n or median (interquartile range).

Supplemental Figure 1. PPARα and PPRβ/δ activation induces the expression of TFPI-1 in human primary macrophages. Expression of TFPI-1 was measured by Q-PCR in differentiated macrophages treated in the absence or in the presence of GW1516 (100 nM), GW647 (600 nM) or GW1929 (600 nM), for 24 h. Results are representative of those obtained from 3 independent macrophage preparations and are expressed relative to the levels in untreated cells set as 1. Each bar is the mean value ± SD of triplicate determinations. Statistically significant differences between treatments and controls are indicated (*p < 0.05; **p < 0.01).

Supplemental Figure 2. PPARγ activation does not modify TFPI-1 activity in human primary macrophages. TFPI-1 specific activity was measured in differentiated macrophages treated or not with GW1929 (600 nM) for 24 h.

Supplemental Figure 3. PPARγ activation reduces the TF/TFPI-1 ratio. Differentiated macrophages were treated with GW1929 (24 h, 600 nM), washed and then incubated in the presence of FVIIa (10 nM) for a further 24 h. TF and TFPI-1 mRNA levels were measured by Q-PCR and normalized to those of cyclophilin, and their ratio calculated and expressed as the mean value ± SD of triplicate determinations. Statistically significant differences are indicated (*p < 0.05).

  1. Supplementary Material

References

  1. G. Chinetti-Gbaguidi, S. Colin, and B. Staels, “Macrophage subsets in atherosclerosis,” Nature Reviews Cardiology, vol. 12, no. 1, pp. 10–17, 2015. View at: Publisher Site | Google Scholar
  2. P. Libby, “Inflammation in atherosclerosis,” Nature, vol. 420, no. 6917, pp. 868–874, 2002. View at: Publisher Site | Google Scholar
  3. P. Libby, M. Aikawa, and U. Schönbeck, “Cholesterol and atherosclerosis,” Biochimica et Biophysica Acta—Molecular and Cell Biology of Lipids, vol. 1529, no. 1–3, pp. 299–309, 2000. View at: Publisher Site | Google Scholar
  4. I. Tabas, “Macrophage death and defective inflammation resolution in atherosclerosis,” Nature Reviews Immunology, vol. 10, no. 1, pp. 36–46, 2010. View at: Publisher Site | Google Scholar
  5. L. Petit, P. Lesnik, C. Dachet, M. Moreau, and M. J. Chapman, “Tissue factor pathway inhibitor is expressed by human monocyte—derived macrophages: relationship to tissue factor induction by cholesterol and oxidized LDL,” Arteriosclerosis, Thrombosis, and Vascular Biology, vol. 19, no. 2, pp. 309–315, 1999. View at: Publisher Site | Google Scholar
  6. J. Crawley, F. Lupu, A. D. Westmuckett, N. J. Severs, V. V. Kakkar, and C. Lupu, “Expression, localization, and activity of tissue factor pathway inhibitor in normal and atherosclerotic human vessels,” Arteriosclerosis, Thrombosis, and Vascular Biology, vol. 20, no. 5, pp. 1362–1373, 2000. View at: Publisher Site | Google Scholar
  7. K. G. Mann, C. Van't Veer, K. Cawthern, and S. Butenas, “The role of the tissue factor pathway in initiation of coagulation,” Blood Coagulation and Fibrinolysis, vol. 9, no. 1, pp. S3–S7, 1998. View at: Google Scholar
  8. B. A. Lwaleed and P. S. Bass, “Tissue factor pathway inhibitor: structure, biology and involvement in disease,” Journal of Pathology, vol. 208, no. 3, pp. 327–339, 2006. View at: Publisher Site | Google Scholar
  9. N. Mackman, “Role of tissue factor in hemostasis, thrombosis, and vascular development,” Arteriosclerosis, Thrombosis, and Vascular Biology, vol. 24, no. 6, pp. 1015–1022, 2004. View at: Publisher Site | Google Scholar
  10. B. M. Mueller, R. A. Reisfeld, T. S. Edgington, and W. Ruf, “Expression of tissue factor by melanoma cells promotes efficient hematogenous metastasis,” Proceedings of the National Academy of Sciences of the United States of America, vol. 89, no. 24, pp. 11832–11836, 1992. View at: Publisher Site | Google Scholar
  11. J. L. Yu, L. May, V. Lhotak et al., “Oncogenic events regulate tissue factor expression in colorectal cancer cells: implications for tumor progression and angiogenesis,” Blood, vol. 105, no. 4, pp. 1734–1741, 2005. View at: Publisher Site | Google Scholar
  12. X. Wang, E. Gjernes, and H. Prydz, “Factor VIIa induces tissue factor-dependent up-regulation of interleukin-8 in a human keratinocyte line,” Journal of Biological Chemistry, vol. 277, no. 26, pp. 23620–23626, 2002. View at: Publisher Site | Google Scholar
  13. G. Demetz, I. Seitz, A. Stein et al., “Tissue Factor-Factor VIIa complex induces cytokine expression in coronary artery smooth muscle cells,” Atherosclerosis, vol. 212, no. 2, pp. 466–471, 2010. View at: Publisher Site | Google Scholar
  14. E. Rigamonti, G. Chinetti-Gbaguidi, and B. Staels, “Regulation of macrophage functions by PPAR-α, PPAR-γ, and LXRs in mice and men,” Arteriosclerosis, Thrombosis, and Vascular Biology, vol. 28, no. 6, pp. 1050–1059, 2008. View at: Publisher Site | Google Scholar
  15. G. Chinetti-Gbaguidi, M. Baron, M. A. Bouhlel et al., “Human atherosclerotic plaque alternative macrophages display low cholesterol handling but high phagocytosis because of distinct activities of the PPARγ and LXRα pathways,” Circulation Research, vol. 108, no. 8, pp. 985–995, 2011. View at: Publisher Site | Google Scholar
  16. B. P. Neve, D. Corseaux, G. Chinetti et al., “PPARα agonists inhibit tissue factor expression in human monocytes and macrophages,” Circulation, vol. 103, no. 2, pp. 207–212, 2001. View at: Publisher Site | Google Scholar
  17. N. Marx, N. Mackman, U. Schönbeck et al., “PPARα activators inhibit tissue factor expression and activity in human monocytes,” Circulation, vol. 103, no. 2, pp. 213–219, 2001. View at: Publisher Site | Google Scholar
  18. J.-B. Park, B.-K. Kim, Y.-W. Kwon et al., “Peroxisome proliferator-activated receptor-gamma agonists suppress tissue factor overexpression in rat balloon injury model with paclitaxel infusion,” PLoS ONE, vol. 6, no. 11, Article ID e28327, 2011. View at: Publisher Site | Google Scholar
  19. G. Chinetti, S. Lestavel, V. Bocher et al., “PPAR-α and PPAR-γ activators induce cholesterol removal from human macrophage foam cells through stimulation of the ABCA1 pathway,” Nature Medicine, vol. 7, no. 1, pp. 53–58, 2001. View at: Publisher Site | Google Scholar
  20. G. Bories, S. Colin, J. Vanhoutte et al., “Liver X receptor activation stimulates iron export in human alternative macrophages,” Circulation Research, vol. 113, no. 11, pp. 1196–1205, 2013. View at: Publisher Site | Google Scholar
  21. A. J. Balmforth, P. J. Grant, E. M. Scott et al., “Inter-subject differences in constitutive expression levels of the clock gene in man,” Diabetes and Vascular Disease Research, vol. 4, no. 1, pp. 39–43, 2007. View at: Publisher Site | Google Scholar
  22. C. Lupu, E. Poulsen, S. Roquefeuil, A. D. Westmuckett, V. V. Kakkar, and F. Lupu, “Cellular effects of heparin on the production and release of tissue factor pathway inhibitor in human endothelial cells in culture,” Arteriosclerosis, Thrombosis, and Vascular Biology, vol. 19, no. 9, pp. 2251–2262, 1999. View at: Publisher Site | Google Scholar
  23. E. Rigamonti, C. Fontaine, B. Lefebvre et al., “Induction of CXCR2 receptor by peroxisome proliferator-activated receptor γ in human macrophages,” Arteriosclerosis, Thrombosis, and Vascular Biology, vol. 28, no. 5, pp. 932–939, 2008. View at: Publisher Site | Google Scholar
  24. G. Chinetti-Gbaguidi, C. Copin, B. Derudas et al., “The coronary artery disease-associated gene C6ORF105 is expressed in human macrophages under the transcriptional control of PPARγ,” FEBS Letters, vol. 589, no. 4, pp. 461–466, 2015. View at: Publisher Site | Google Scholar
  25. G. Chinetti-Gbaguidi, M. A. Bouhlel, C. Copin et al., “Peroxisome proliferator-activated receptor-γ activation induces 11β-hydroxysteroid dehydrogenase type 1 activity in human alternative macrophages,” Arteriosclerosis, Thrombosis, and Vascular Biology, vol. 32, no. 3, pp. 677–685, 2012. View at: Publisher Site | Google Scholar
  26. J. W. Nicol, G. A. Helt, S. G. Blanchard Jr., A. Raja, and A. E. Loraine, “The Integrated Genome Browser: free software for distribution and exploration of genome-scale datasets,” Bioinformatics, vol. 25, no. 20, pp. 2730–2731, 2009. View at: Publisher Site | Google Scholar
  27. T. S. Mikkelsen, Z. Xu, X. Zhang et al., “Comparative epigenomic analysis of murine and human adipogenesis,” Cell, vol. 143, no. 1, pp. 156–169, 2010. View at: Publisher Site | Google Scholar
  28. M. J. Davies and A. Thomas, “Thrombosis and acute coronary-artery lesions in sudden cardiac ischemic death,” The New England Journal of Medicine, vol. 310, no. 18, pp. 1137–1140, 1984. View at: Publisher Site | Google Scholar
  29. H. H. Versteeg, M. P. Peppelenbosch, and C. A. Spek, “The pleiotropic effects of tissue factor: a possible role for factor VIIa-induced intracellular signalling?” Thrombosis and Haemostasis, vol. 86, no. 6, pp. 1353–1359, 2001. View at: Google Scholar
  30. Z.-C. Jia, Y.-L. Wan, J.-Q. Tang et al., “Tissue factor/activated factor VIIa induces matrix metalloproteinase-7 expression through activation of c-Fos via ERK1/2 and p38 MAPK signaling pathways in human colon cancer cell,” International Journal of Colorectal Disease, vol. 27, no. 4, pp. 437–445, 2012. View at: Publisher Site | Google Scholar
  31. C. Roma-Lavisse, M. Tagzirt, C. Zawadzki et al., “M1 and M2 macrophage proteolytic and angiogenic profile analysis in atherosclerotic patients reveals a distinctive profile in type 2 diabetes,” Diabetes and Vascular Disease Research, vol. 12, no. 4, pp. 279–289, 2015. View at: Publisher Site | Google Scholar
  32. K. Y. Cho, H. Miyoshi, S. Kuroda et al., “The phenotype of infiltrating macrophages influences arteriosclerotic plaque vulnerability in the carotid artery,” Journal of Stroke and Cerebrovascular Diseases, vol. 22, no. 7, pp. 910–918, 2013. View at: Publisher Site | Google Scholar
  33. S. Shaikh, J. Brittenden, R. Lahiri, P. A. J. Brown, F. Thies, and H. M. Wilson, “Macrophage subtypes in symptomatic carotid artery and femoral artery plaques,” European Journal of Vascular and Endovascular Surgery, vol. 44, no. 5, pp. 491–497, 2012. View at: Publisher Site | Google Scholar
  34. J. Golledge, S. Mangan, and P. Clancy, “Effects of peroxisome proliferator-activated receptor ligands in modulating tissue factor and tissue factor pathway inhibitor in acutely symptomatic carotid atheromas,” Stroke, vol. 38, no. 5, pp. 1501–1508, 2007. View at: Publisher Site | Google Scholar
  35. G. Orasanu, O. Ziouzenkova, P. R. Devchand et al., “The peroxisome proliferator-activated receptor-γ agonist pioglitazone represses inflammation in a peroxisome proliferator-activated receptor-α-dependent manner in vitro and in vivo in mice,” Journal of the American College of Cardiology, vol. 52, no. 10, pp. 869–881, 2008. View at: Publisher Site | Google Scholar

Copyright © 2016 G. Chinetti-Gbaguidi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


More related articles

 PDF Download Citation Citation
 Download other formatsMore
 Order printed copiesOrder
Views816
Downloads574
Citations

Related articles

Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.