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The addition of monoclonal antibodies to the antigen receptor complex on the malignant human T-cell line Jurkat generates increases in inositol trisphosphate and in the concentration of cytoplasmic free calcium. Exposure of Jurkat cells to cholera toxin for 3 hr inhibited these receptor-mediated events and led to a selective, partial loss of the antigen receptor complex from the cellular surface. None of the effects of cholera toxin on the antigen receptor complex were mimicked by the B subunit of cholera toxin or by increasing intracellular cAMP levels with either forskolin or 8-bromo cAMP. These results suggest that a cholera toxin substrate can regulate signal transduction by the T-cell antigen receptor.

Cholera toxin inhibits the T-cell antigen receptor-mediated increases in inositol trisphosphate and cytoplasmic free calcium.