PMID- 17055754 OWN - NLM STAT- MEDLINE DCOM- 20061222 LR - 20220224 IS - 1074-7613 (Print) IS - 1097-4180 (Electronic) IS - 1074-7613 (Linking) VI - 25 IP - 5 DP - 2006 Nov TI - The adaptor molecule MyD88 activates PI-3 kinase signaling in CD4+ T cells and enables CpG oligodeoxynucleotide-mediated costimulation. PG - 783-93 AB - While T cells respond directly to toll-like receptor (TLR) agonists, TLR-signaling pathways in T cells are poorly characterized. Here we demonstrate in CD4(+) T cells that CpG DNA directly enhances proliferation, prevents anergy, and augments humoral responses to a T cell-dependent antigen by a Myeloid differentiation primary-response protein 88 (MyD88) and Phosphatidylinositol 3-kinase (PI-3 kinase)-dependent pathway. PI-3 kinase activation required a putative Src-homology domain (SH2) binding motif in the MyD88 Toll-Like or IL-1 Receptor (TIR) domain. Reconstitution of MyD88-deficient primary T cells with a MyD88 transgene mutated in this motif abrogated association of PI-3 kinase with MyD88, phosphorylation of protein kinase B (Akt) and Glycogen Synthetase Kinase-3 (GSK-3), and interleukin-2 (IL-2) production. The MyD88 death domain, on the other hand, was required for NF-kB activation and survival. These studies identify a MyD88-dependent PI-3 kinase-signaling pathway in T cells that differentiates CpG DNA-mediated proliferation from survival and is required for an in vivo T cell-dependent immune response. FAU - Gelman, Andrew E AU - Gelman AE AD - Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19010, USA. FAU - LaRosa, David F AU - LaRosa DF FAU - Zhang, Jidong AU - Zhang J FAU - Walsh, Patrick T AU - Walsh PT FAU - Choi, Yongwon AU - Choi Y FAU - Sunyer, J Oriol AU - Sunyer JO FAU - Turka, Laurence A AU - Turka LA LA - eng GR - R01 AI062789-01A1/AI/NIAID NIH HHS/United States GR - P01 AI041521/AI/NIAID NIH HHS/United States GR - AI-41521/AI/NIAID NIH HHS/United States GR - R01 AI062789/AI/NIAID NIH HHS/United States GR - AI-62789/AI/NIAID NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural DEP - 20061019 PL - United States TA - Immunity JT - Immunity JID - 9432918 RN - 0 (Interleukin-2) RN - 0 (Myd88 protein, mouse) RN - 0 (Myeloid Differentiation Factor 88) RN - EC 2.7.1.- (Phosphatidylinositol 3-Kinases) SB - IM MH - Animals MH - Apoptosis/physiology MH - CD4-Positive T-Lymphocytes/*immunology/metabolism MH - Cell Proliferation MH - CpG Islands/*immunology MH - Flow Cytometry MH - Immunoblotting MH - Immunoprecipitation MH - Interleukin-2/immunology/metabolism MH - Lymphocyte Activation/immunology MH - Mice MH - Mice, Inbred C57BL MH - Mice, Transgenic MH - Myeloid Differentiation Factor 88/immunology/*metabolism MH - Phosphatidylinositol 3-Kinases/immunology/*metabolism MH - Signal Transduction/*immunology PMC - PMC2840381 MID - NIHMS181519 EDAT- 2006/10/24 09:00 MHDA- 2006/12/23 09:00 PMCR- 2010/03/17 CRDT- 2006/10/24 09:00 PHST- 2006/02/15 00:00 [received] PHST- 2006/07/11 00:00 [revised] PHST- 2006/08/28 00:00 [accepted] PHST- 2006/10/24 09:00 [pubmed] PHST- 2006/12/23 09:00 [medline] PHST- 2006/10/24 09:00 [entrez] PHST- 2010/03/17 00:00 [pmc-release] AID - S1074-7613(06)00442-0 [pii] AID - 10.1016/j.immuni.2006.08.023 [doi] PST - ppublish SO - Immunity. 2006 Nov;25(5):783-93. doi: 10.1016/j.immuni.2006.08.023. Epub 2006 Oct 19.