Recruitment of SHP-1 protein tyrosine phosphatase and signalling by a chimeric T-cell receptor-killer inhibitory receptor.

M D Christensen, C Geisler

Scandinavian journal of immunology 2000 Jun

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Receptors expressing the immunoreceptor tyrosine-based inhibitory motif (ITIM) in their cytoplasmic tail play an important role in the negative regulation of natural killer and B-cell activation. A subpopulation of T cells expresses the ITIM containing killer cell inhibitory receptor (KIR), which recognize MHC class I molecules. Following coligation of KIR with an activating receptor, the tyrosine in the ITIM is phosphorylated and the cytoplasmic protein tyrosine phosphatase SHP-1 is recruited to the ITIM via its SH2 domains. It is still not clear how SHP-1 affects T-cell receptor (TCR) signalling. In this study, we constructed a chimeric TCR-KIR receptor. We demonstrated that SHP-1 is recruited to the chimeric TCR-KIR receptor following T-cell stimulation with either anti-TCR monoclonal antibody (MoAb) or superantigen. However, in spite of this we could not detect any effect of SHP-1 on TCR signalling regarding total protein tyrosine phosphorylation, TCR down-regulation, mobilization of intracellular free calcium, or induction of the activation markers CD69 and CD25.

Citation

M D Christensen, C Geisler. Recruitment of SHP-1 protein tyrosine phosphatase and signalling by a chimeric T-cell receptor-killer inhibitory receptor. Scandinavian journal of immunology. 2000 Jun;51(6):557-64