Linked Life Data

1706380

Source:http://linkedlifedata.com/resource/pubmed/id/1706380

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pubmed-article:1706380pubmed:abstractTextAlthough cortical (CD4+CD8+) thymocytes mobilize intracellular calcium poorly when CD3/TCR is ligated, we have found that murine cortical thymocytes can transduce strong biochemical signals in response to ligation of the CD3/Ti TCR complex (CD3/TCR) and that the signals are regulated by CD4 and CD8 interactions with CD3/TCR. Striking increases in intracellular calcium were observed in cortical thymocytes from transgenic mice containing productively rearranged alpha and beta TCR genes, when CD3 or TCR was cross-linked with CD4 or CD8 using heteroconjugated mAb. However, in mature T cells derived from lymph nodes of these mice, identical stimuli elicited calcium responses that were significantly smaller in magnitude. A thymocyte cell line that expresses a low level of the transgenic TCR and has a phenotype characteristic of cortical thymocytes (CD4+CD8+J11d+Thy-1+) was established from a female alpha beta TCR transgenic mouse. Cross-linking of CD4 or CD8 molecules to CD3/TCR induced strong calcium responses in these cells. Responses were weak or absent when CD3 or TCR were aggregated alone. Heteroconjugates of Thy-1xCD3 did not increase the intracellular calcium concentration in transgenic thymocytes or in the thymocyte cell line, although Thy-1 is highly expressed on immature cells. Enhanced tyrosine phosphorylation was observed when CD3 or TCR was cross-linked with CD4 or CD8 on transgenic thymocytes or on the thymocyte cell line, in comparison with aggregation of CD3/TCR alone. Taken together, these data show that CD4 and CD8 molecules allow the weakly expressed CD3/TCR of cortical thymocytes to transduce strong intracellular signals upon receptor ligation. These signals may be involved in selection processes at the CD4+CD8+ stage of differentiation.lld:pubmed
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pubmed-article:1706380pubmed:articleTitleCD4 and CD8 are positive regulators of T cell receptor signal transduction in early T cell differentiation.lld:pubmed
pubmed-article:1706380pubmed:affiliationOncogen/Bristol-Myers Squibb, Seattle, WA 98121.lld:pubmed
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