NPY Inhibition of Catecholamine Release

Catecholamine synthesis and release are two separate but related processes that influence the level of catecholaminergic neurotransmission. Neuropeptide Y (NPY) is a 36 amino acid peptide that is highly homologous to peptide YY (PYY). NPY exerts its various biological effects through at least six classes of receptors, designated Y₁, Y₂, Y₃, Y₄, Y₅, and Y₆. It has been demonstrated that NPY inhibits catecholamine synthesis via the Y₃ receptor subtype, in contrast to the Y₂ subtype that mediates inhibition of catecholamine release. Although inhibition of both synthesis and release by these receptor subtypes is via inhibition of Ca²⁺ entry, the two processes are associated with actions on distinct Ca²⁺ channel subtypes. Inhibition of L-type Ca²⁺ channels mediates inhibition of catecholamine synthesis, while inhibition of N-type Ca²⁺ channels inhibits catecholamine release.

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References:

McCullough, L.A., et al., Neuropeptide Y receptors involved in calcium channel regulation in PC12 cells. Regul. Pept., 75-76, 101-107 (1998).

Cavadas, C., et al., NPY regulates catecholamine secretion from human adrenal chromaffin cells. J. Clin. Endocrinol Metab., 86, 5956-5963 (2001).