title: Effect of glucocorticoids pretreatment on steroidogenic capacity of adrenocortical cells isolated from Meishan piglets.
abstract: The present in vitro experiment was designed to test whether 48 h of pretreatment with glucocorticoids, cortisol, or dexamethasone (DEX), would affect basal and corticotrophin (ACTH) stimulated (24 h) cortisol secretion from primary cultures of pig adrenocortical cells. Cells were divided into six groups: control pretreatment with or without ACTH challenge, cortisol pretreatment with or without ACTH challenge, and DEX pretreatment with or without ACTH. The culture medium and cells were collected at the end of treatment. Cortisol concentration in medium was measured by radioimmunoassay, and protein content of glucocorticoid receptor (GR) and key regulatory factors for steroidogenesis, including melanocortin type 2 receptor (MC2R), steroidogenic acute regulatory protein (StAR) and cholesterol side-chain cleavage cytochrome P450 (P450scc), were detected by Western blot analysis. The results showed that glucocorticoid pretreatment did not affect cortisol secretion under basal condition without ACTH challenge, but significantly enhanced ACTH-stimulated cortisol secretion. Furthermore, the protein content of GR, MC2R, StAR, and P450scc was all increased in groups pretreated with glucocorticoids. These results indicate that adrenocortical cells pretreated with glucocorticoids display higher steroidogenic capacity under ACTH challenge, through the upregulation of GR and other steroidogenic regulatory factors.
authors.affiliation: Key Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing, People's Republic of China.
authors.forename: Liu-An
authors.initials: LA
authors.lastname: Li
authors.forename: Zhan-Wang
authors.initials: ZW
authors.lastname: Wu
authors.forename: Xiao-Jing
authors.initials: XJ
authors.lastname: Yang
authors.forename: Ying-Dong
authors.initials: YD
authors.lastname: Ni
authors.forename: Nahid
authors.initials: N
authors.lastname: Parvizi
authors.forename: Ru-Qian
authors.initials: RQ
authors.lastname: Zhao
mesh_terms: D000311:Adrenal Glands / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D000324:Adrenocorticotropic Hormone / Q000494:pharmacology*; D000818:Animals; D002478:Cells, Cultured; D002786:Cholesterol Side-Chain Cleavage Enzyme / Q000378:metabolism; D003907:Dexamethasone / Q000494:pharmacology*; D005938:Glucocorticoids / Q000494:pharmacology*; D006854:Hydrocortisone / Q000378:metabolism / Q000494:pharmacology*; D008297:Male; D010750:Phosphoproteins / Q000378:metabolism; D013552:Swine; D000098682:Steroidogenic Acute Regulatory Protein
chemical_list: D005938:Glucocorticoids; D010750:Phosphoproteins; D000098682:Steroidogenic Acute Regulatory Protein; D003907:Dexamethasone; D000324:Adrenocorticotropic Hormone; D002786:Cholesterol Side-Chain Cleavage Enzyme; D006854:Hydrocortisone