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Y2 receptor deletion attenuates the type 2 diabetic syndrome of ob/ob mice

Abstract

Hypothalamic neuropeptide Y (NPY) is implicated in the regulation of a variety of physiological functions, notably energy homeostasis and reproduction. Chronically elevated NPY levels in the hypothalamus, as in genetically obese ob/ob mice, are associated with obesity, a syndrome of type 2 diabetes, and infertility. However, it is not known which of the five cloned Y receptors mediate these effects. Here, we show that crossing the Y2 receptor knockout mouse (Y2(-/-)) onto the ob/ob background attenuates the increased adiposity, hyperinsulinemia, hyperglycemia, and increased hypothalamo-pituitary-adrenal (HPA) axis activity of ob/ob mice. Compared with lean controls, ob/ob mice had elevated expression of NPY and agouti-related protein (AgRP) mRNA in the arcuate nucleus and decreased expression of proopiomelanocortin (POMC) and cocaine- and amphetamine-regulated transcript (CART) mRNA. Y2 deletion in ob/ob mice significantly increased the hypothalamic POMC mRNA expression, with no effect on NPY, AgRP, or CART expression. [Y2(-/-)ob/ob] mice were no different from ob/ob littermates with respect to food intake and body weight, and Y2 receptor deficiency had no beneficial effect on the infertility or the reduced hypothalamo-pituitary-gonadotropic function of ob/ob mice. These data demonstrate that Y2 receptors mediate the obese type 2 diabetes phenotype of ob/ob mice, possibly via alterations in melanocortin tonus in the arcuate nucleus and/or effects on the HPA axis.

Type Journal
ISBN 0012-1797 (Print)
Authors Sainsbury, A.;Schwarzer, C.;Couzens, M.;Herzog, H. :
Garvan Authors Prof Herbert Herzog
Publisher Name DIABETES
Published Date 2002-01-01 00:00:00
Published Volume 51
Published Issue 12
Published Pages 3420-7
URL http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=12453895
Status Published In-print