| Peroxisome proliferator-activated receptor gamma induces apoptosis and inhibits autophagy of human monocyte-derived macrophages via induction of cathepsin L: potential role in atherosclerosis. | |
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MedLine Citation:
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PMID: 21700710 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Macrophages play a pivotal role in the pathophysiology of atherosclerosis. These cells express cathepsin L (CatL), a cysteine protease that has been implicated in atherogenesis and the associated arterial remodeling. In addition, macrophages highly express peroxisome proliferator-activated receptor (PPAR) γ, a transcription factor that regulates numerous genes important for lipid and lipoprotein metabolism, for glucose homeostasis, and inflammation. Hence, PPARγ might affect macrophage function in the context of chronic inflammation such as atherogenesis. In the present study, we examined the effect of PPARγ activation on the expression of CatL in human monocyte-derived macrophages (HMDM). Activation of PPARγ by the specific agonist GW929 concentration-dependently increased the levels of CatL mRNA and protein in HMDM. By promoter analysis, we identified a functional PPAR response element-like sequence that positively regulates CatL expression. In addition, we found that PPARγ-induced CatL promotes the degradation of Bcl2 without affecting Bax protein levels. Consistently, degradation of Bcl2 could be prevented by a specific CatL inhibitor, confirming the causative role of CatL. PPARγ-induced CatL was found to decrease autophagy through reduction of beclin 1 and LC3 protein levels. The reduction of these proteins involved in autophagic cell death was antagonized either by the CatL inhibitor or by CatL knockdown. In conclusion, our data show that PPARγ can specifically induce CatL, a proatherogenic protease, in HMDM. In turn, CatL inhibits autophagy and induces apoptosis. Thus, the proatherogenic effect of CatL could be neutralized by apoptosis, a beneficial phenomenon, at least in the early stages of atherosclerosis. |
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Authors:
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Dler Faieeq Darweesh Mahmood; Imene Jguirim-Souissi; El-Hadri Khadija; Nicolas Blondeau; Vimala Diderot; Souliman Amrani; Mohamed-Naceur Slimane; Tatiana Syrovets; Thomas Simmet; Mustapha Rouis |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2011-06-23 |
Journal Detail:
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Title: The Journal of biological chemistry Volume: 286 ISSN: 1083-351X ISO Abbreviation: J. Biol. Chem. Publication Date: 2011 Aug |
Date Detail:
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Created Date: 2011-08-15 Completed Date: 2011-10-19 Revised Date: 2011-10-19 |
Medline Journal Info:
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Nlm Unique ID: 2985121R Medline TA: J Biol Chem Country: United States |
Other Details:
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Languages: eng Pagination: 28858-66 Citation Subset: IM |
Affiliation:
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Unité de Recherche, Vieillissement, Stress et Inflammation, Université Pierre et Marie Curie, 75252 Paris, Cedex 5, France. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Apoptosis* Atherosclerosis / genetics, metabolism*, pathology Autophagy* Cathepsin L / genetics, metabolism* Humans Macrophages / metabolism*, pathology Monocytes / metabolism*, pathology PPAR gamma / genetics, metabolism* Proto-Oncogene Proteins c-bcl-2 / genetics, metabolism Response Elements / genetics bcl-2-Associated X Protein / genetics, metabolism |
| Chemical | |
Reg. No./Substance:
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0/BAX protein, human; 0/PPAR gamma; 0/Proto-Oncogene Proteins c-bcl-2; 0/bcl-2-Associated X Protein; EC 3.4.22.15/CTSL1 protein, human; EC 3.4.22.15/Cathepsin L |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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