Abstract
SUMMARY Progesterone in vitro decreases the rates of glucose uptake and of acetate uptake and oxidation, of lipogenesis from acetate and of oxygen consumption, and reduces the intracellular concentrations of ATP and citrate in slices of luteinized rat ovary incubated in a bicarbonate-buffered medium. The effect on glucose uptake was shown to be due to inhibition by progesterone of the membrane transport of glucose. In view of the steroid concentrations used to elicit these effects in vitro and the known actions of steroids such as progesterone on biological membranes, these observations are thought to be due to non-physiological lytic effects.
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