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© The Rockefeller University Press, 0022-1007/1997/5/1837/ $5.00
The Journal of Experimental Medicine, Volume 185, Number 10, May 19, 1997 1837-1849


Articles

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

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

From the * University of California, San Diego, La Jolla, California 92093; {ddagger} La Jolla Institute of Allergy and Immunology, San Diego, California 92121; § The Burnham Institute, La Jolla, California 92037; and || 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.


Address correspondence to Susan L. Swain, Trudeau Institute, PO Box 59, 100 Algonquin Ave., Saranac Lake, NY 12983. The present address of T. Sato is Columbia University, New York, NY 10027. The present address of L. Bradley and X. Zhang is Scripps Research Institute, La Jolla, CA 92032. The present address of P. Rogers is La Jolla Institute of Allergy and Immunology, San Diego, CA 92121.

The authors are thankful to S. Nagata and P. Golstein for providing valuable reagents.

This research was supported by National Institutes of Health grants AI37935 and AI26887 to S.L. Swain, GM52735 to D.R. Green, CA72994 and ACS IM414 to J.C. Reed, and a fellowship from the U.S. Army Breast Cancer Program to T. Sato. T. Brunner is a fellow of the Swiss Society for Med. Biol. Fellowships.

1Abbreviations used in this paper: AICD, activation-induced cell death; CFSE, 5- (and 6-) carboxyfluorescein diacetate succinimidyl ester; FasL, Fas ligand; ICAM, intracellular adhesion molecule; FAP-1, Fas-associated phosphatase 1; FL, fluorescein; mRNA, messenger RNA; PCCF, pigeon cytochrome c fragment 88-104; RPA, RNase protection assay; TdT, terminal deoxynucleotidyl transferase; Tg, transgenic.

X. Zhang and T. Brunner contributed equally to this work.


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