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Gossypol is an antifertility agent which inhibits steroidogenesis in both sexes. The present study investigated the binding of gossypol in organelles of cultured bovine luteal cell to elucidate its inhibitory site of action in steroid biosynthesis. Cultured bovine luteal cells were incubated with 3H-gossypol (4.3 or 2.15 microM) for 3 hours. At the end of treatment, cultured bovine luteal cells were harvested, homogenized and centrifuged for organelle preparation. The radioactivity of gossypol was measured in each subcellular fraction. The cell membrane fraction has the highest binding capacity for gossypol, and the majority of gossypol was located in the particulate fractions. Results of the present study provide information in understanding the regulatory mechanism of gossypol on antisteroidogenic and/or toxic effects in cultured bovine luteal cells.
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