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 Blood, 21 May 2009, Vol. 113, No. 21, pp. 5202-5205.
Prepublished online as a Blood First Edition Paper on March 26, 2009; DOI 10.1182/blood-2008-09-181255.

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IMMUNOBIOLOGY

Brief report

Reduction of T cell–derived ghrelin enhances proinflammatory cytokine expression: implications for age-associated increases in inflammation

Vishwa D. Dixit1, Hyunwon Yang1, Anthony Cooper-Jenkins1, Banabihari B. Giri1, Kalpesh Patel1, and Dennis D. Taub1

1 Laboratory of Immunology, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, MD

Ghrelin (Grln) is a peptide hormone that is predominantly produced in the stomach and stimulates appetite and induces growth hormone (GH) release. We have previously reported that ghrelin is also expressed in T cells and exerts prothymic and anti-inflammatory effects. However, the biologic relevance of T cell–derived ghrelin remains to be determined. Here, we report that acylated-bioactive ghrelin is expressed in human T cells and preferentially segregates within the lipid raft domains upon TCR ligation. The RNA interference (RNAi)–mediated down-regulation of ghrelin in primary human T cells activates IkB, and increases Th1 cytokines and IL-17 secretion. Ghrelin expression declines with increasing age in spleen and T cells and exogenous ghrelin administration in old mice reduces proinflammatory cytokines. These findings demonstrate that ghrelin functions in an autocrine and paracrine capacity to regulate proinflammatory cytokine expression in human and murine T cells and may contribute in regulating "inflamm-aging."


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H. Yang, Y.-H. Youm, B. Vandanmagsar, J. Rood, K. G. Kumar, A. A. Butler, and V. D. Dixit
Obesity accelerates thymic aging
Blood, October 29, 2009; 114(18): 3803 - 3812.
[Abstract] [Full Text] [PDF]


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