Costimulation by CD137/4-1BB inhibits T cell apoptosis and induces Bcl-xL and c-FLIPshort via phosphatidylinositol 3-kinase and AKT/protein kinase B

Item Type:	Article
Title:	Costimulation by CD137/4-1BB inhibits T cell apoptosis and induces Bcl-xL and c-FLIPshort via phosphatidylinositol 3-kinase and AKT/protein kinase B
Creators Name:	Staerck, L. and Scholz, C. and Doerken, B. and Daniel, P.T.
Abstract:	Costimulation is essential for induction of T lymphocyte proliferation and inhibition of activation-induced cell death. While signaling pathways activated following the ligation of the costimulatory molecule CD28 are well defined, less is known about the molecular events induced by alternative costimulators. CD137/4-1BB, a costimulatory member of the tumor necrosis factor receptor family, plays an important role during late primary T cell stimulation. Here, we demonstrate for the first time that inhibition of activation-induced cell death by exposure to the CD137/4-1BB ligand involves up-regulation of the anti-apoptotic protein c-FLIP(short). Inhibition of T cell death by 4-1BB ligation and up-regulation of c-FLIP(short) and Bcl-x(L) were abolished by blocking the phosphatidylinositol 3-kinase or the AKT/protein kinase B, which also mediate CD28-induced inhibition of activation-induced cell death. Our findings, therefore, demonstrate that costimulatory molecules, although belonging to different protein families and participating in distinct upstream signaling pathways, employ common downstream signaling pathways.
Keywords:	4-1BB, T cell, c-FLIP short, PI3 kinase, Animals, Mice
Source:	European Journal of Immunology
ISSN:	0014-2980
Publisher:	Wiley
Volume:	35
Page Range:	1257-1266
Date:	1 January 2005
Official Publication:	https://doi.org/10.1002/eji.200425686
PubMed:	View item in PubMed

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