PMID: 9636198Jun 24, 1998Paper

Expression of the peroxisome proliferator-activated receptor gamma (PPARgamma) in human atherosclerosis and regulation in macrophages by colony stimulating factors and oxidized low density lipoprotein

Proceedings of the National Academy of Sciences of the United States of America
M RicoteC K Glass

Abstract

The peroxisome proliferator-activated receptor gamma (PPARgamma) is a ligand-dependent transcription factor that has been demonstrated to regulate fat cell development and glucose homeostasis. PPARgamma is also expressed in a subset of macrophages and negatively regulates the expression of several proinflammatory genes in response to natural and synthetic ligands. We here demonstrate that PPARgamma is expressed in macrophage foam cells of human atherosclerotic lesions, in a pattern that is highly correlated with that of oxidation-specific epitopes. Oxidized low density lipoprotein (oxLDL) and macrophage colony-stimulating factor, which are known to be present in atherosclerotic lesions, stimulated PPARgamma expression in primary macrophages and monocytic cell lines. PPARgamma mRNA expression was also induced in primary macrophages and THP-1 monocytic leukemia cells by the phorbol ester 12-O-tetradecanoylphorbol 13-acetate (TPA). Inhibition of protein kinase C blocked the induction of PPARgamma expression by TPA, but not by oxLDL, suggesting that more than one signaling pathway regulates PPARgamma expression in macrophages. TPA induced the expression of PPARgamma in RAW 264.7 macrophages by increasing transcription from the PPAR...Continue Reading

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