title: Pituitary corticotrophs proliferate temporarily after adrenalectomy.
abstract: Relationship of corticotroph proliferation answer and survival time after adrenalectomy was examined. Corticotroph proliferation rates were detected by short-term 3H-thymidine radiolabeling, then ACTH immunostaining and autoradiography. Effect of adrenalectomy on corticotroph proliferation rate was examined in vivo and an elevation was demonstrated first on the second postoperative day, increasing on the third-fourth day postoperatively and then decreasing. Effects of different secretagogues on corticotroph proliferation were examined in short-term pituitary monolayer cultures taken from ADX rats. CRF and Forskolin treatment potentiated corticotroph proliferation in cultures taken from adrenalectomized rats, but not in the controls. We suggest that croticotroph proliferation is stimulated via the cAMP-proteinkinase A pathway, while adrenalectomy plays a permissive role.
authors.affiliation: Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest.
authors.forename: M
authors.initials: M
authors.lastname: Gulyás
authors.forename: L
authors.initials: L
authors.lastname: Pusztai
authors.forename: G
authors.initials: G
authors.lastname: Rappay
authors.forename: G B
authors.initials: GB
authors.lastname: Makara
mesh_terms: D000315:Adrenalectomy; D000324:Adrenocorticotropic Hormone / Q000378:metabolism; D000818:Animals; D000001:Calcimycin / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured / Q000187:drug effects; D005576:Colforsin / Q000494:pharmacology; D003346:Corticotropin-Releasing Hormone / Q000494:pharmacology; D008297:Male; D010903:Pituitary Gland, Anterior / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D005576:Colforsin; D000001:Calcimycin; D000324:Adrenocorticotropic Hormone; D003346:Corticotropin-Releasing Hormone