PMID: 9178821May 16, 1997Paper

Adhesion of HT-29 colon carcinoma cells to E-selectin results in increased tyrosine phosphorylation and decreased activity of c-src

International Journal of Cancer. Journal International Du Cancer
S A SolteszC Fisher

Abstract

Adhesion of metastatic cancer cells at secondary sites is known to be regulated by several families of adhesion proteins, including selectins and integrins. Colon carcinoma cells have been shown to tether to and roll on both stimulated endothelial cells and purified E-selectin. We have demonstrated that HT-29 human colon carcinoma cells adhere specifically to an E-selectin-IgG chimera. Upon adhesion to E-selectin, the amount of tyrosine phosphorylation of several proteins in HT-29 cell lysates increases compared with cells in bovine serum albumin-coated wells on phosphotyrosine Western blots; this increase is statistically significant. This effect is specific for adhesion to E-selectin, since addition of an E-selectin blocking monoclonal antibody (MAb), E3, to the wells causes a statistically significant decrease in tyrosine phosphorylation relative to E-selectin alone on phosphotyrosine Western blots. One protein that is affected this way has been identified as c-src. Kinase assays show a dose-dependent and statistically significant decrease in c-src activity upon adhesion to E-selectin, which correlates with an increase in phosphorylation of Tyr 527, the negative regulatory tyrosine. CnBr digestion of 32P-labeled c-src shows ...Continue Reading

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