Endocrinology, Vol 133, 1753-1758, Copyright © 1993 by Endocrine Society

ARTICLES

Chronic intracerebroventricular neuropeptide-Y administration to normal rats mimics hormonal and metabolic changes of obesity

N Zarjevski, I Cusin, R Vettor, F Rohner-Jeanrenaud and B Jeanrenaud
Faculty of Medicine, Laboratoires de Recherches Metaboliques, Geneva, Switzerland.

Chronic intracerebroventricular (icv) administration of neuropeptide-Y (NPY; 10 micrograms/day) was performed in normal female rats to investigate its hormonal and metabolic consequences. Intracerebroventricular NPY produced hyperphagia, increased basal insulinemia, as well as liver and adipose tissue lipogenic activity. It also increased basal morning corticosteronemia. When NPY-induced hyperphagia was prevented by pair-feeding, the icv NPY treatment resulted in the same increases in basal insulinemia and corticosteronemia, and liver and white adipose tissue lipogenesis was still higher than that in respective controls. Under the ad libitum and pair-feeding conditions, icv NPY stimulated glucose uptake as well as total lipoprotein lipase activity in white adipose tissue; it resulted in an increase total activity of hepatic and white adipose tissue acetyl coenzyme-A-carboxylase. As all hormonal and metabolic changes elicited by icv NPY remained present (at the same or to a lesser extent depending upon the parameter considered) when hyperphagia was prevented by pair-feeding, it was, thus, shown that icv NPY per se induces peripheral hormonal and metabolic alterations via efferent routes, which remain to be determined. The effects of icv NPY reported in this study are similar to the defects observed in the early phase of genetic obesity in rodents, the hypothalamus of which has increased NPY levels. NPY could, thus, be of relevance in the occurrence of genetically induced obesity.

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