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The Journal of Neuroscience, October 1, 2000, 20(19):7353-7361

Mechanisms Mediating Pituitary Adenylate Cyclase-Activating Polypeptide Depolarization of Rat Sympathetic Neurons

Matthew M. Beaudet, Rodney L. Parsons, Karen M. Braas, and Victor May

Department of Anatomy and Neurobiology, University of Vermont College of Medicine, Given Health Science Building, Burlington, Vermont 05405

The direct effects of pituitary adenylate cyclase-activating polypeptides (PACAP) on sympathetic neurons were investigated using rat superior cervical ganglion neurons. Electrophysiological and pharmacological analyses were used to evaluate PACAP modulation of sympathetic neuron membrane potentials and to investigate potential ionic and intracellular signaling mechanisms mediating the responses. More than 90% of the sympathetic neurons were depolarized by the PACAP peptides even when stimulated release was blocked, indicating that the PACAP peptides elicited primary responses in the postganglionic neurons. The response profile was consistent for activation of PACAP-selective PAC₁ receptors: nanomolar concentrations of PACAP27 and PACAP38 were required to stimulate depolarization, whereas vasoactive intestinal peptide failed to evoke any response. Furthermore, depolarizations elicited by PACAP27 were reduced by the PAC₁ receptor antagonist PACAP(6-38). Both sodium influx and inhibition of a potassium current contributed to the peptide-induced depolarizations. Activation of neither pertussis toxin- nor cholera toxin-sensitive G-proteins was required for generation of the depolarizations. cAMP and diacylglycerol production and activation of protein kinase A or protein kinase C also were not requisite for the responses. By contrast, phospholipase C (PLC)-dependent inositol 1,4,5-triphosphate (IP₃) synthesis was crucial to the PACAP-mediated depolarizations. Although calcium release from IP₃-sensitive stores was not required for the PACAP-induced responses, inhibition of IP₃ receptors reduced the depolarizations. Thus, among the many signal transduction pathways coupled to the PAC₁ receptor, the PACAP-induced depolarization of sympathetic neurons appears to require activation of PLC and subsequent generation of IP₃.

Key words: sympathetic; superior cervical ganglion; autonomic; pituitary adenylate cyclase-activating polypeptide; PACAP; Trp channel; IP₃

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Copyright © 2000 Society for Neuroscience  0270-6474/00/20197353-09$05.00/0

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