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(American Journal of Pathology. 1998;153:17-23.)
© 1998 American Society for Investigative Pathology


Short Communication

Macrophages in Human Atheroma Contain PPAR{gamma}

Differentiation-Dependent Peroxisomal Proliferator-ActivatedReceptor {gamma} (PPAR{gamma}) Expression and Reduction of MMP-9 Activitythrough PPAR{gamma} Activation in Mononuclear Phagocytes inVitro

Nikolaus Marx, Galina Sukhova, Curran Murphy, Peter Libby and Jorge Plutzky

From the Vascular Medicine and Atherosclerosis Unit, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts

Mononuclear phagocytes play an important role in atherosclerosis and its sequela plaque rupture in part by their secretion of matrix metalloproteinases (MMPs), including MMP-9. Peroxisomal proliferator-activated receptor {gamma} (PPAR{gamma}), a transcription factor in the nuclear receptor superfamily, regulates gene expression in response to various activators, including 15-deoxy-{Delta}12,14-prostaglandin J2 and the antidiabetic agent troglitazone. The role of PPAR{gamma} in human atherosclerosis is unexplored. We report here that monocytes/macrophages in human atherosclerotic lesions (n = 12) express immunostainable PPAR{gamma}. Normal artery specimens (n = 6) reveal minimal immunoreactive PPAR{gamma}. Human monocytes and monocyte-derived macrophages cultured for 6 days in 5% human serum expressed PPAR{gamma} mRNA and protein by reverse transcription-polymerase chain reaction and Western blotting, respectively. In addition, PPAR{gamma} mRNA expression in U937 cells increased during phorbol 12-myristate 13 acetate-induced differentiation. Stimulation of PPAR{gamma} with troglitazone or 15-deoxy-{Delta}12,14-prostaglandin J2 in human monocyte-derived macrophages inhibited MMP-9 gelatinolytic activity in a concentration-dependent fashion as revealed by zymography. This inhibition correlates with decreased MMP-9 secretion as determined by Western blotting. Thus, PPAR{gamma} is present in macrophages in human atherosclerotic lesions and may regulate expression and activity of MMP-9, an enzyme implicated in plaque rupture. PPAR{gamma} is likely to be an important regulator of monocyte/macrophage function with relevance for human atherosclerotic disease.





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