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Selective activation of central NPY Y1 vs. Y5 receptor elicits hyperinsulinemia via distinct mechanisms.

Abstract
Central administration of neuropeptide Y (NPY) stimulates hyperphagia and hyperinsulinemia. Recent evidence has suggested that the Y1 and Y5 receptor subtypes may both mediate NPY-stimulated feeding. The present study attempts to further characterize the role of central NPY receptor subtypes involved in hyperinsulinemia. NPY and peptide analogs of NPY that selectively activated the NPY Y1 or Y5 receptor subtype induced feeding and hyperinsulinemia in satiated Long Evans rats, whereas NPY analogs that selectively activated the NPY Y2 or Y4 receptor subtype did not. To determine whether NPY-induced hyperinsulinemia is secondary to its hyperphagic effect, we compared the plasma insulin levels in the presence and absence of food after a 1-min central infusion of NPY and its analogs at 15, 60, and 120 min postinfusion. Our data suggest that selective activation of central NPY Y1 receptor subtype induced hyperinsulinemia independent of food ingestion, whereas the NPY Y5 receptor-induced hyperinsulinemia was dependent on food ingestion. Central administration of the selective Y1 receptor agonist D-Arg25 NPY eventually decreased plasma glucose levels 2 h postinfusion in Long Evans rats.
AuthorsJun Gao, Lorraine Ghibaudi, Joyce J Hwa
JournalAmerican journal of physiology. Endocrinology and metabolism (Am J Physiol Endocrinol Metab) Vol. 287 Issue 4 Pg. E706-11 (Oct 2004) ISSN: 0193-1849 [Print] United States
PMID15187000 (Publication Type: Journal Article)
Chemical References
  • Blood Glucose
  • Insulin
  • Neuropeptide Y
  • Receptors, Neuropeptide Y
  • neuropeptide Y-Y1 receptor
  • neuropeptide Y2 receptor
  • neuropeptide Y4 receptor
  • neuropeptide Y5 receptor
  • Glucagon
Topics
  • Animals
  • Biotransformation (physiology)
  • Blood Glucose (metabolism)
  • Eating (physiology)
  • Glucagon (blood)
  • Hyperinsulinism (metabolism)
  • Injections, Intraventricular
  • Insulin (blood)
  • Male
  • Neuropeptide Y (administration & dosage, analogs & derivatives, pharmacology)
  • Rats
  • Rats, Long-Evans
  • Receptors, Neuropeptide Y (agonists, metabolism)

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