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Diabetes, Vol 44, Issue 2 147-151, Copyright © 1995 by American Diabetes Association

ARTICLES

Effect of intracerebroventricular insulin infusion on diabetic hyperphagia and hypothalamic neuropeptide gene expression

AJ Sipols, DG Baskin and MW Schwartz
Division of Endocrinology/Metabolism, Seattle Veterans Affairs Medical Center, Washington 98108-1532.

To test the hypothesis that diabetic hyperphagia results from insulin deficiency in the brain, diabetic rats (streptozotocin-induced) were given an intracerebroventricular (ICV) infusion of saline or insulin (at a dose that did not affect plasma glucose levels) for 6 days. Food and water intake were significantly increased in diabetic rats, but only food intake was affected by ICV insulin. Diabetic hyperphagia was reduced 58% by ICV insulin compared with ICV saline (P < 0.05) and was accompanied by a 69% increase in diabetes-induced weight loss (P < 0.05). To evaluate whether central nervous system (CNS) insulin deficiency affects expression of neuropeptides involved in food intake, in situ hybridization was done for neuropeptide Y (NPY), which stimulates feeding, in the hypothalamic arcuate nucleus and for cholecystokinin (CCK) and corticotropin-releasing hormone (CRH), which inhibit feeding, in the hypothalamic paraventricular nucleus. In diabetic rats, NPY mRNA hybridization increased 280% (P < 0.05), an effect reduced 40% by ICV insulin (P < 0.05). CCK mRNA hybridization increased 50% in diabetic rats (P < 0.05), a response reduced slightly by ICV insulin (P < 0.05), whereas CRH mRNA hybridization decreased 33% in diabetic rats (P < 0.05) and was unchanged by ICV insulin. The results demonstrate that CNS infusion of insulin to diabetic rats reduces both hyperphagia and overexpression of hypothalamic NPY mRNA. This observation supports the hypothesis that a deficiency of insulin in the brain is an important cause of diabetic hyperphagia and that increased hypothalamic NPY gene expression contributes to this phenomenon.
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Copyright © 1995 by the American Diabetes Association.