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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/05/1837/13 $2.00
Volume 185, Number 10, May 19, 1997 1837-1849

Unequal Death in T Helper Cell (Th)1 and Th2 Effectors: Th1, but not Th2, Effectors Undergo Rapid Fas/FasL-mediated Apoptosis

By Xiaohong Zhang,* Thomas Brunner,Dagger Laura Carter,* Richard W. Dutton,* Paul Rogers,* Linda Bradley,* Takaaki Sato,§ John C. Reed,§ Douglas Green,Dagger and Susan L. Swain*par

From the * University of California, San Diego, La Jolla, California 92093; Dagger  La Jolla Institute of Allergy and Immunology, San Diego, California 92121; § The Burnham Institute, La Jolla, California 92037; and par  Trudeau Institute, Saranac Lake, New York 12983

T helper cell (Th) 1, but not Th2, effectors undergo rapid Fas/Fas ligand (FasL)-mediated, activation-induced cell death upon restimulation with antigen. Unequal apoptosis is also observed without restimulation, after a longer lag period. Both effectors undergo delayed apoptosis induced by a non-Fas-mediated pathway. When Th1 and Th2 effectors are co-cultured, Th2 effectors survive preferentially, suggesting the responsible factor(s) is intrinsic to each population. Both Th1 and Th2 effectors express Fas and FasL, but only Th2 effectors express high levels of FAP-1, a Fas-associated phosphatase that may act to inhibit Fas signaling. The rapid death of Th1 effectors leading to selective Th2 survival provides a novel mechanism for differential regulation of the two subsets.


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