Parallel signaling pathways of pituitary adenylate cyclase activating polypeptide (PACAP) regulate several intrinsic ion channels. Issue 1 (4th June 2019)

• Record Type: Journal Article
• Authors: Johnson, Gregory C.; May, Victor; Parsons, Rodney L.; Hammack, Sayamwong E.
• Editors: Eiden, Lee E.; Zhang, Limei
• Is Part Of: Annals of the New York Academy of Sciences. Volume 1455:Issue 1(2019)
• Page Start: 105
• Page End: 112
• Publication Date: 2019-06-04
• Subjects: currents -- PAC1 -- ERK -- HCN -- Kv -- endosome; Medical sciences -- Periodicals; Medicine -- Periodicals; Science -- Periodicals; 610
• DOI: 10.1111/nyas.14116
• Languages: English
• ISSNs: 0077-8923

Abstract

Abstract: Pituitary adenylate cyclase activating polypeptide (PACAP), acting through its cognate receptors PAC1, VPAC1, and VPAC2, is a pleiotropic signaling neuropeptide of the vasoactive intestinal peptide/secretin/glucagon family. PACAP has known functions in neuronal growth, development, and repair, and central PACAP signaling has acute behavioral consequences. One of the ways in which PACAP may affect neuronal function is through the modulation of intrinsic membrane currents to control neuronal excitability. Here, we review the evidence of PACAP‐dependent modulation of calcium‐ and voltage‐gated potassium currents, hyperpolarization‐activated cation currents, calcium currents, and voltage‐gated sodium currents. Interestingly, PACAP signaling pathways diverge into parallel pathways to target different ionic currents for modulation, though single pathways are not limited to modulating just one target ionic current. Despite the various targets of modulation, the weight of the evidence suggests that PACAP signaling most commonly leads to a net increase in neuronal excitability. We discuss possible mechanisms by which PACAP signaling leads to the modulation of intrinsic membrane currents that may contribute to changes in behavior. Abstract : Pituitary adenylate cyclase activating polypeptide (PACAP) is a signaling neuropeptide with functions in neuronal growth, development, and repair, and central PACAP signaling has acute behavioral consequences. PACAP may affect neuronal function through the modulation of intrinsic membrane currents to control neuronal excitability. This review discusses possible mechanisms by which PACAP signaling leads to the modulation of intrinsic membrane currents that may contribute to changes in behavior.