The Journal of Experimental Medicine
VeriKine-HS Human Interferon-Beta Serum
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Published online 28 May 2002 doi:10.1084/jem.20012076
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© Rockefeller University Press, 0022-1007/2002/6/1499/ $5.00
The Journal of Experimental Medicine, Volume 195, Number 11, June 3, 2002 1499-1505


Brief Definitive Report

Mechanism of Transforming Growth Factor ß–induced Inhibition of T Helper Type 1 Differentiation

Leonid Gorelik1,2, Stephanie Constant1 and Richard A. Flavell1,2

1 Yale University School of Medicine, New Haven, CT 06520
2 Howard Hughes Medical Institute, New Haven, CT 06520

Address correspondence to Richard A. Flavell, FRS Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06520. Phone: 203-737-2216; Fax: 203-737-2958; E-mail: fran.manzo{at}yale.edu

Regulation by transforming growth factor (TGF)-ß plays an important role in immune homeostasis. TGF-ß inhibits T cell functions by blocking both proliferation and differentiation. Here we show that TGF-ß blocks Th1 differentiation by inhibiting the expression of T-bet, the apparent masterregulator of T helper (Th)1 differentiation. Restoration of T-bet expression through retroviral transduction of T-bet into developing Th1 cells abrogated the inhibitory effect of TGF-ß. In addition, we show that, contrary to prior suggestions, downregulation of interleukin 12 receptor ß2 chain is not key to the TGF-ß–mediated effect. Furthermore, we show that the direct inhibitory effect of TGF-ß on T cells is responsible, at least in part, for the inability of BALB/c mice to mount a Leishmania-specific Th1 response and to clear Leishmanial infection.

Key Words: T cell • differentiation • TGF-ß • T-bet • Leishmania


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