Linked Life Data

8106089

Source:http://linkedlifedata.com/resource/pubmed/id/8106089

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pubmed-article:8106089pubmed:abstractTextGanglioside (GM1) modulation of CD4 off the surface of T lymphocytes defined functions of the CD4 molecule during signal transduction through the T cell receptor (TCR)/CD3 complex. Antibody cross-linking of CD3 alone (3 x 3) stimulated phospholipase C (PLC) activity, rapid Ca2+ flux, and protein phosphorylations in freshly isolated human T lymphocytes. Antibody cross-linking of CD4 and CD3 (3 x 4) stimulated greater signaling than that caused by 3 x 3. Cross-linking CD4 alone did not stimulate these signaling processes. GM1-modulation of CD4 from the cell surface blocked all aspects of the augmented signaling imparted by CD4 co-modulation with CD3. In comparison, pretreatment with the protein tyrosine kinase inhibitor genistein inhibited 3 x 4-stimulated PLC activity and protein phosphorylation but not Ca2+ flux. Antibody cross-linking of the tyrosine phosphatase CD45 with 3 x 4 (3 x 4 x 45) also inhibited CD4-augmented phosphorylations and like genistein did not reduce Ca2+ levels. In conclusion, these data demonstrate that CD4 can augment signal transduction through the TCR/CD3 complex by its physical proximity to CD3. TCR/CD3-signaling augmentation by CD4 stimulated protein tyrosine kinases and PLC activities but stimulated intracellular Ca2+ flux through an independent mechanism(s).lld:pubmed
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pubmed-article:8106089pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:8106089pubmed:articleTitleGanglioside (GM1) distinguishes the effects of CD4 on signal transduction through the TCR/CD3 complex in human lymphocytes.lld:pubmed
pubmed-article:8106089pubmed:affiliationNeuroimmunology Research Laboratory, Veterans Administration Medical Center, Portland, OR 97207.lld:pubmed
pubmed-article:8106089pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8106089pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
pubmed-article:8106089pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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