CD28-mediated cytotoxicity by the human leukemic NK cell line YT involves tyrosine phosphorylation, activation of phosphatidylinositol 3-kinase, and protein kinase C.


The human leukemic cell line YT displays spontaneous cytotoxicity against CD80+ and/or CD86+ and ICAM-1+ target cells. In this work, we report that CD28-mediated cytotoxicity of YT involves tyrosine phosphorylation and activation of phosphatidylinositol (PI) 3-kinase, the Tec kinase Itk/Emt, and protein kinase C (PKC). YT mediates lysis of CD80+/CD86+ B… (More)


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