Neuropeptide Y and calcitonin gene-related peptide: effects on glucagon and insulin secretion in the mouse.

Abstract:

:Neuropeptide Y (NPY) and calcitonin gene-related peptide (CGRP) are both intrapancreatic neuropeptides that are known to inhibit stimulated insulin secretion. In the present study, we examined their influences on basal and stimulated glucagon and insulin secretion in the mouse. Either NPY or CGRP was injected intravenously at two dose levels (0.85 or 4.25 nmol/kg). When injected alone, neither of them did affect basal plasma glucagon levels but CGRP reduced basal plasma insulin levels. Glucagon secretion stimulated by the cholinergic agonist carbachol was modestly inhibited by NPY at 4.25 nmol/kg (P less than 0.01) but not affected by CGRP. In contrast, glucagon secretion stimulated by the beta 2-adrenoceptor agonist terbutaline was markedly inhibited by NPY already at the lower dose level (P less than 0.01) and potentiated by CGRP (P less than 0.01). Insulin secretion stimulated by carbachol was inhibited by CGRP (P less than 0.01) but not affected by NPY, whereas terbutaline-induced insulin secretion was inhibited by both NPY (P less than 0.05) and CGRP (P less than 0.01). We conclude that the two intrapancreatic neuropeptides NPY and CGRP have opposite actions on stimulated glucagon secretion in the mouse: NPY in an inhibitory and CGRP in a potentiatory direction. Both peptides, however, inhibit insulin secretion stimulated by terbutaline.

journal_name

Endocr Res

journal_title

Endocrine research

authors

Pettersson M,Lundquist I,Ahrén B

doi

10.3109/07435808709035466

subject

Has Abstract

pub_date

1987-01-01 00:00:00

pages

407-17

issue

4

eissn

0743-5800

issn

1532-4206

journal_volume

13

pub_type

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