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12-O-Tetradecanoylphorbol 13-acetate (TPA) potentiated the action of cAMP in DNA cleavage in thymocytes induced by a low concentration of adenosine receptor-site agonists such as adenosine, 2-chloroadenosine and forskolin. The enhancement of DNA cleavage by TPA was also observed in dibutyryl cAMP-treated thymocytes. On the other hand, TPA suppressed accumulation of cAMP by the adenosine receptor-site agonists. These results suggest that activation of protein kinase C inhibits cAMP production, but stimulates cAMP-triggered process to induce DNA cleavage and death of thymocytes.
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