Abstract
Adenosine, 2-chloroadenosine and prostaglandin E 1 which are known to increase cyclic AMP in neuroblastoma cells potentiated the acetylcholine-induced muscarinic hyperpolarization of the cells without changing the resting membrane potential. The potentiation caused by 2-chloroadenosine was further augmented by Ro 20-1724, a phosphodiesterase inhibitor. A direct intracellular pressure application of cyclic AMP potentiated the muscarinic hyperpolarization without changing the resting membrane potential. Morphine which inhibits adenylate cyclase antagonized 2-chloroadenosine-induced potentiation of the muscarinic hyperpolarization. These results suggest that changes in cyclic AMP level modulate the muscarinic response of neuroblastoma cells.
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