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The ability of prostaglandin I2 (PGI2) to stimulate cyclic AMP production by granulosa cells, isolated from intact immature rats, has been demonstrated in vitro. The minimal effective dose was 15 ng/ml, which was comparable to the minimal effective dose for PGE2. However, a concentration of 15 microgram/ml PGI2 was required to stimulate cyclic AMP production maximally, compared to a concentration of 1 microgram/ml PGE2, which produced the maximum response. It therefore appears that PGI2 is not more effective than PGE2 in stimulating cyclic AMP production in granulosa cells, and is possibly less effective. Submaximal concentrations of PGI2 appeared to be able to modify the stimulation of cyclic AMP production by follicle-stimulating hormone (FSH), but whether or not PGI2 plays any role in follicular function remains to be established.
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