Vasoactive intestinal peptide and pituitary adenylate cyclase‐activating polypeptide promote in vivo generation of memory Th2 cells
- 21 August 2002
- journal article
- Published by Wiley in The FASEB Journal
- Vol. 16 (13), 1-19
- https://doi.org/10.1096/fj.02-0248fje
Abstract
Functionally active effector T cells are generated through clonal expansion. Most effector T cells are later eliminated, whereas a small number survive and differentiate into memory T cells. The mechanisms by which some effector T cells escape apoptosis and become memory T cells are not understood. Neuropeptides such as the vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) inhibit antigen-induced apoptosis of CD4 T cells. By using an in vivo long-term experimental model, in which CD4 T cells from TRC-transgenic mice were transferred into hosts, we demonstrate that VIP and PACAP induce the survival and/or generation of antigen-specific CD4 T cells with a memory Th2 phenotype. This was confirmed by the fact that transgenic CD4 T cells were recovered only from mice that received Th2, but not Th1 effector cells, in the presence of VIP or PACAP. In vitro, VIP/PACAP support the survival of Th2, but not Th1, cell lines through an inhibition of antigen-induced apoptosis. The role of neuropeptides in the biased development of Th2 memory cells is particularly relevant in view of the immune deviation existing in immune-privileged sites such as the brain and eye, where Th2, but not Th1, responses occur in nonpathological conditions.Keywords
Funding Information
- Presbyterian Historical Society (AI 041786-03, AI 47325-01, PM98-0081)
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