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Antagonistic effects of phorbol esters on lymphocyte activation. Evidence that protein kinase C provides an early signal associated with lytic function
Authors:J H Russell  D E McCulley  A S Taylor
Abstract:There is increasing evidence that protein kinase C plays a role in the transduction of an activation signal in lymphocytes. The bulk of this evidence is based on pharmacological experiments involving the tumor promoter phorbol myristate acetate (PMA) as a protein kinase C agonist. However, in cytotoxic T lymphocytes, PMA has been shown to both stimulate and inhibit lytic function. By examining the effects of a series of phorbol esters on protein kinase C activity in lymphocytes, we will demonstrate that these antagonistic effects of PMA on cytotoxic T lymphocyte function are related to multiple effects of PMA on protein kinase C activity.
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