Effects of dexamethasone and gonadotropins on the testis of the adrenalectomized lizard Mabuya carinata (Schn.)
The effects of gonadotropins (LH + FSH) and dexamethasone on the spermatogenic and steroidogenic activity in the adrenalectomized Mabuya carinata have been studied. Secondary spermatocytes, spermatids, and spermatozoa were absent, and there was a significant decrease in the activity levels of delta 5-3 beta-hydroxysteroid dehydrogenase (delta 5-3 beta-HSDH) and glucose-6-phosphate dehydrogenase in the adrenalectomized lizards compared with those of controls. Administration of either dexamethasone or LH + FSH to adrenalectomized lizards resulted in restoration of testicular activity as revealed by the appearance of secondary spermatocytes, spermatids, and spermatozoa and a significant increase in the activity level of delta 5-3 beta-HSDH compared to that of adrenalectomized lizards. The results indicate that impairment in gonadotropin secretion might be a major factor in inducing testicular regression following adrenalectomy in M. carinata.
Yajurvedi
H N
HN
Department of Zoology, University of Mysore, Manasagangotri, India.
Chandramohan
K
K
D015096:3-Hydroxysteroid Dehydrogenases / Q000378:metabolism; D000315:Adrenalectomy; D000818:Animals; D003907:Dexamethasone / Q000494:pharmacology*; D005260:Female; D005640:Follicle Stimulating Hormone / Q000494:pharmacology*; D008116:Lizards / Q000502:physiology*; D007986:Luteinizing Hormone / Q000494:pharmacology*; D008297:Male; D013091:Spermatogenesis / Q000187:drug effects; D013737:Testis / Q000187:drug effects* / Q000502:physiology
D003907:Dexamethasone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D015096:3-Hydroxysteroid Dehydrogenases