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From the * University of California, San Diego, La Jolla, California 92093; 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.
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
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