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. 1987 Mar;84(5):1384–1388. doi: 10.1073/pnas.84.5.1384

Crosslinking of surface antigens causes mobilization of intracellular ionized calcium in T lymphocytes.

J A Ledbetter, C H June, L S Grosmaire, P S Rabinovitch
PMCID: PMC304434  PMID: 3103134

Abstract

Antibodies binding to a large subset of T-cell differentiation antigens, including CD2, CD4, CD5, CD6, CD7, CD8, Tp44, and CDw18, cause an increase in the cytoplasmic calcium concentration [( Ca2+]i) after the antigens are crosslinked on the cell surface. Similar crosslinking-induced signals were seen for a subset of mouse thymocyte differentiation antigens. The various antigens on human T cells differed in the extent of crosslinking required for generating the calcium signal, as evidenced by comparisons with monoclonal versus polyclonal second-step antibody. The [Ca2+]i increase that occurs after crosslinking represents mobilization of cytoplasmic calcium since the initial component of the signal is resistant to depletion of extracellular calcium by chelation with EGTA. The [Ca2+]i increase is completely inhibited by pretreatment of cells with pertussis toxin, indicating that a substrate for pertussis toxin regulates the signal transduction. Crosslinking of antigens other than the CD3/T-cell receptor complex did not result in T-cell proliferation. Crosslinking of CD2 and Tp44, but not other antigens, resulted in expression of functional interleukin 2 receptors. Comparisons of three different anti-CD3 antibodies showed that a second calcium signal was generated by crosslinking, even when the anti-CD3 antibodies were used at optimal concentrations.

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Selected References

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