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Am J Physiol Endocrinol Metab 262: E627-E630, 1992;
0193-1849/92 $5.00
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AJP - Endocrinology and Metabolism, Vol 262, Issue 5 E627-E630, Copyright © 1992 by American Physiological Society

ARTICLES

Effect of prolactin on 2-deoxyglucose uptake in mouse mammary gland explants

B. J. Peters and J. A. Rillema
Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan 48201.

These studies were carried out to explore the possible effect of prolactin (PRL) on glucose uptake into culture mammary gland explants derived from 12- to 14-day pregnant mice. PRL was found to stimulate an increased rate of uptake of a nonmetabolized glucose analogue, 2-[3H]deoxyglucose, into cultured mammary tissues. The onset of this response was 16 h after the addition of PRL, and the response persisted for at least 24 h. A similar temporal response was observed when the PRL stimulation of [14C]glucose oxidation to 14CO2 was determined. The lowest PRL concentration that elicited a stimulation of 2-deoxyglucose uptake was 20 ng/ml, and a maximum response occurred with PRL at a concentration of 250 ng/ml. Ongoing protein synthesis appears to be essential for PRL to express its effect on 2-deoxyglucose transport since cyclohexamide, puromycin, and actinomycin D abolished the PRL response. It is also apparent that the PRL stimulation of 2-deoxyglucose involves activation of a specific carrier-mediated uptake transport system, since the rate of uptake of L-glucose into mouse mammary gland explants was unaffected by PRL.


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