title: Steroidogenesis and extracellular cAMP accumulation in adrenal tumor cell cultures.
abstract: ACTH stimulated steroidogenesis and cAMP (adenosine 3',5'-monophosphate) accumulation in an adrenocortical mouse tumor cell line (clone Y1) with Kd values which differed by more than one order of magnitude (5.2 X 10(-11) M and 7 X 10(-10) M, respectively). All of the cAMP formed in response to added ACTH appeared extracellularly in 5- or 30-min incubations. ACTH, at 5 and 10 muU/ml, stimulated steroidogenesis to 25% and 40% of maximum activity; and increased the extracellular accumulation of cAMP 1.4-fold and 2.3-fold, respectively. The effects of ACTH appeared to be via an action on intracellular ATP, specific for cAMP and dependent on an ACTH-sensitive adenylate cyclase system. These observations indicate that ACTH increases cAMP accumulation in Y1 cells at virtually all steroidogenic concentrations and suggest that cAMP is an essential component of ACTH-stimulated steroidogenesis.
mesh_terms: D000244:Adenosine Diphosphate / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000306:Adrenal Cortex Neoplasms / Q000378:metabolism*; D000310:Adrenal Gland Neoplasms / Q000378:metabolism*; D000324:Adrenocorticotropic Hormone / Q000494:pharmacology*; D002460:Cell Line; D000242:Cyclic AMP / Q000378:metabolism*; D009374:Neoplasms, Experimental / Q000378:metabolism; D013256:Steroids / Q000096:biosynthesis*; D013806:Theophylline / Q000494:pharmacology
chemical_list: D013256:Steroids; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D000324:Adrenocorticotropic Hormone; D013806:Theophylline; D000242:Cyclic AMP