Furthermore, high blood levels of insulin can act by increasing androgenous hormonal
stimulation of the ovarian theca cells as well as potentiating gonadotropin - stimulated ovarian
androgen steroidogenesis — although recent data has suggested that the insulin - induced increase in ovarian
hormone secretion is not accompanied by increased steroid metabolism.74 Hyperinsulinaemia may also affect the central actions of
androgen by impairing progesterone inhibition of the gonadotropin - releasing
hormone pulse generator.75 Insulin has also been shown to increase expression of adrenal steroidogenic enzyme mRNA47 as well as adrenal responsiveness to adrenocorticotropic
hormone.76