Effects of tropic hormones on ultrastructure and synthesis of androgens in adrenals of male pseudohermaphrodite rats

Abstract

Ultrastructural and biochemical study of the adrenals in the pseudohermaphrodite (tfm) rat reveals hypertrophic adrenocortical cells. The cytoplasm of the cells in the zonae fasciculata and reticularis contains an exceptionally well developed smooth endoplasmic reticulum closely applied to mitochondria and lipid droplets. Mitochondria are more numerous than in normals and have especially abundant tubular cristae. More lipid droplets (appearing as empty vacuoles) are surrounded by pleomorphic mitochondria. The incubation study indicates that the capacity of rat adrenal cortex of producing androgens is greater in tfm than in normal animals. Hypophysectomy and castration result in a significant decrease in androgen biosynthesis by tfm rat adrenals and cause a reduced concentration of plasma testosterone. Administration of tropic hormones to hypophysectomized-castrated rats appears to stimulate their adrenal androgenesis. It is suggested that in tfm rats the higher than normal luteinizing hormone (LH) together with adrenocorticotropic hormone (ACTH) stimulates the hypertrophy of cellular organelles in the adrenal cortex and causes an accompanying increase in androgenic steroids which may be responsible, at least in part, for the increased level of plasma androgens.