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Molecular Medicine |
From the Department of Internal Medicine II (N.M., B.K., K.K., M.G., W.K., V.H.), Cardiology, University of Ulm, Ulm, Germany, and the Leducq Center for Cardiovascular Research (P.L., J.P.), Cardiovascular Division, Department of Medicine, Brigham and Womens Hospital and Harvard Medical School, Boston, Mass.
Correspondence to Nikolaus Marx, MD, Department of Internal Medicine II, Cardiology, University of Ulm, Robert-Koch-Str. 8, D-89081 Ulm, Germany. E-mail nikolaus.marx{at}medizin.uni-ulm.de
Activation of T lymphocytes and their ensuing elaboration of proinflammatory cytokines, such as interferon (IFN)-
, represent a critical step in atherogenesis and arteriosclerosis. IFN
pathways also appear integral to the development of transplantation-associated arteriosclerosis (Tx-AA), limiting long-term cardiac allograft survival. Although disruption of these IFN
signaling pathways limits atherosclerosis and Tx-AA in animals, little is known about inhibitory regulation of proinflammatory cytokine production in humans. The present study investigated whether activators of peroxisome proliferator-activated receptor (PPAR)
and PPAR
, with their known antiinflammatory effects, might regulate the expression of proinflammatory cytokines in human CD4-positive T cells. Isolated human CD4-positive T cells express PPAR
and PPAR
mRNA and protein. Activation of CD4-positive T cells by anti-CD3 monoclonal antibodies significantly increased IFN
protein secretion from 0 to 504±168 pg/mL, as determined by ELISA. Pretreatment of cells with well-established PPAR
(WY14643 or fenofibrate) or PPAR
(BRL49653/rosiglitazone or pioglitazone) activators reduced anti-CD3-induced IFN
secretion in a concentration-dependent manner. PPAR activators also inhibited TNF
and interleukin-2 protein expression. In addition, PPAR activators markedly reduced cytokine mRNA expression in these cells. Such antiinflammatory actions were also evident in cell-cell interactions with medium conditioned by PPAR activator-treated T cells attenuating human monocyte CD64 expression and human endothelial cell major histocompatibility complex class II induction. Thus, activation of PPAR
and PPAR
in human CD4-positive T cells limits the expression of proinflammatory cytokines, such as IFN
, yielding potential therapeutic benefits in pathological processes, such as atherosclerosis and Tx-AA.
Key Words: atherosclerosis fibrates thiazolidinediones peroxisome proliferator-activated receptors T cells
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