An Endogenous Ovarian Growth Factor Which Stimulates BALB/3T3 and Granulosa Cell Proliferation

Abstract
Extracts of whole porcine ovary stimulate mouse BALB/3T3 [3H]DNA synthesis. Biochemical characterization indicates the growth factor is associated with a soluble cationic protein that is labile to heat, stable to dithiothreitol treatment and elutes from Sephadex G-100 between chymotrypsin (25,000 MW) and cytochrome c (12,700 MW). Extracts of thecal tissue have growth-promoting activity in both granulosa and 3T3 cells. Conditioned medium from thecal but not granulosa cell cultures stimulated [3]DNA synthesis in quiescent 3T3 and granulosa cells. The presence of an endogenous protein ovarian growth factor found in the theca that stimulates granulosa cell proliferation in vitro is implicated.

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