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Am J Physiol Regul Integr Comp Physiol 253: R121-R127, 1987;
0363-6119/87 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 253, Issue 1 121-R127, Copyright © 1987 by American Physiological Society

ARTICLES

Development of postglucoprivic insulin-induced suckling and feeding in rats

C. L. Williams and E. M. Blass

Increased food or milk intake in response to insulin-induced hypoglycemia cannot be demonstrated in the rat until pups reach weaning age. However, when food and suckling are withheld from insulin-treated 5- to 25-day-old rats until their altered blood glucose levels return to normal, their rate of milk intake via suckling from their anesthetized dam is increased over saline-treated control pups. This postglucoprivic action of insulin could not be demonstrated in rats consuming wet mash until pups reached 25-30 days of age. Nonnutritive oral stimulation from dry suckling during the glucoprivic episode is sufficient to disrupt postglucoprivic suckling in 20-day-old rats. In contrast consuming a small quantity of wet mash became an effective inhibitor of postglucoprivic suckling only when pups reached 25 days of age. These data demonstrate the existence of an insulin-sensitive neural system for suckling and feeding in infant rats and point to the involvement of multiple and changing oral factors during development in insulin-induced postglucoprivic feeding.


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Am J Physiol Regulatory Integrative Comp Physiol, November 1, 1997; 273(5): R1649 - R1656.
[Abstract] [Full Text] [PDF]


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