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The effects of progesterone on isolated rat adipocytes were studied in vitro during various steps of glucose metabolism, transport, lipogenesis and lipolysis. Progesterone decreased the phosphorylation of glucose into glucose-6-phosphate as assessed by measuring the uptake of 2-deoxyglucose but it had no effect on transmembrane transport of glucose as determined by measuring the entry of 3-0-methylglucose into the cell. As glucose phosphorylation is a rate-limiting step of the pentose-phosphate pathway, these data could explain the inhibition of lipogenesis and the enhancement of lipolysis observed when progesterone is present in incubation medium. Progesterone might thus modulate a regulatory step of glucose metabolism and antagonize insulin action in the fat cell.
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C. Darimont, R. Delansorne, J. Paris, G. Ailhaud, and R. Negrel Influence of Estrogenic Status on the Lipolytic Activity of Parametrial Adipose Tissue in Vivo: an in Situ Microdialysis Study Endocrinology, March 1, 1997; 138(3): 1092 - 1096. [Abstract] [Full Text] [PDF] |
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