Abstract
Myomodulin A (MM A) application or stimulation of neuron B16, which releases MM A, increases cAMP levels in the accessory radula closer (ARC) muscle of Aplysia. MM A application also increases cAMP-dependent protein kinase (cAPK) activity in one subcellular compartment of the muscle. These results suggest that at least part of MM A's effects in this system are mediated via the cAPK signal transduction pathway. Since the effects of the small cardioactive peptides (SCPs) on ARC muscle contraction are similar to those of MM A, our results suggest that the convergent physiological effects of MM A and SCP B in this system may be due, in part, to the two peptide neuromodulators utilizing the same signal transduction pathway.
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