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“We conclude that FSH and IGF-I can augment absolute rates of progestin biosynthesis by granulosa cells by activating dual mechanisms: stimulation of functional cholesterol side chain cleavage activity and enhancement of effective cellular uptake and utilization of low-density lipoprotein-borne sterol substrate.”
“Granulosa cells were cultured in a serum-free medium for 48 h in the presence of follicle-stimulating hormone (FSH), with or without SM C/IGF I. FSH dose-dependently increased both estrogen and progestin production.”