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Adult hamsters did not increase their food intake in response to subcutaneous injection of 2-deoxy-D-glucose (2DG) at doses of 50, 200, 350, 500, 750, 1,000, or 1,500 mg/kg. The failure to feed in response to 2DG was apparent regardless of time of testing and length of test. Hamsters did display marked hyperglycemia after 2DG treatment. Therefore, hamsters do detect and form neural responses to 2DG. In contrast to 2DG, injection of regular insulin, 2, 4, or 8 U/animal, caused hamsters to significantly increase their food intake over a 5-h test period. Furthermore, injection of 4 U of protamine zinc insulin twice daily also caused pronounced increases in food intake and weight gain by hamsters. Because hamsters do not seem to posses a feeding response to 2DG-induced glucoprivation, it seems unlikely that insulin elicits feeding via the glucoprivic control in this species. The results suggest that 1) hamsters lack the glucoprivic control of feeding behavior as exercised by 2DG, 2) 2DG and insulin treatments are not equivalent ingestive challenges, and 3) insulin-induced feeding may result in part from activation of a nonglucoprivic control of food intake.
AJP - Endocrinology and Metabolism – The American Physiological Society
Published: Jan 1, 1978
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