The tec family kinase, inducible T cell tyrosine kinase (Itk), is critical for both development and activation of T lymphocytes. We have found that Itk regulates TCR/CD3-induced actin-dependent cytoskeletal events. Expression of Src homology (SH) 2 domain mutant Itk transgenes into Jurkat T cells inhibits these events. Furthermore, Itk(-/-) murine T cells display significant defects in TCR/CD3-induced actin polymerization. In addition, Jurkat cells deficient in linker for activation of T cells expression, an adaptor critical for Itk activation, display impaired cytoskeletal events and expression of SH3 mutant Itk transgenes reconstitutes this impairment. Interestingly, expression of an Itk kinase-dead mutant transgene into Jurkat cells has no effect on cytoskeletal events. Collectively, these data suggest that Itk regulates TCR/CD3-induced actin-dependent cytoskeletal events, possibly in a kinase-independent fashion.
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