PMID: 8614246Mar 3, 1995Paper

The role of p56lck in CD4-mediated suppression of CD3-induced early signaling events in T lymphocytes

Life Sciences
G Baier-BitterlichA Altman

Abstract

Crosslinking of the CD4 coreceptor can inhibit subsequent T-cell activation via the T-cell antigen receptor (TCR)/CD3 complex. The ability of the human immunodeficiency virus (HIV) envelope protein, gp 120, to cause similar inhibition has implicated this inhibitory signal in the induction of T-cell anergy and apoptosis observed in the acquired immunodeficiency syndrome (AIDS). In order to clarify the biochemical basis of this inhibition, we analyzed the effect of CD4 ligation on early signaling events induced by subsequent CD3xCD4 co-crosslinking. By comparison with CD3 crosslinking alone, CD3xCD4 co-crosslinking of a CD3+CD4+ human T-cell leukemia line (SupT1) resulted in an enhanced increase in free intracellular calcium concentration and tyrosine phosphorylation of several cellular substrates, including the prominent phosphorylation of an unidentified 120-kDa protein (p120). Prior CD4 ligation inhibited these responses. Similar results were obtained with A3.01, another CD3+CD4+ T leukemic line. However, P120 was only minor phosphorylated on tyrosine upon receptor crosslinking in A2.01/CD4(-cyt401), a derivative line expressing a truncated CD4 coreceptor lacking its cytoplasmic domain which binds the p56lck protein tyrosine k...Continue Reading

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Citations

Sep 5, 2009·The Journal of Clinical Investigation·Jinping ZhangDeyu Fang
Jun 8, 2012·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Alice M NyakerigaAnjali Joshi
Mar 21, 1997·Biochemical Pharmacology·G Baier-BitterlichH Wachter

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