title: Endocrine regulation of rat organic anion transporters.
abstract: Messenger RNA levels of rat organic anion transporter 1 (Oat1; Slc22a6) and Oat2 (Slc22a7) in kidney and Oat3 (Slc22a8) in liver are gender-predominant. Oat1 and Oat3 are male-predominant, whereas Oat2 is female-predominant. Gonadectomized and hypophysectomized (HX) rats were studied to determine whether sex steroids and/or growth hormone (GH) are responsible for these gender-divergent patterns. GH was administered to HX rats by two daily injections (simulating male secretion) or continuous infusion (simulating female secretion). Oat1 mRNA levels, normally higher in male than female kidney, were lowered by gonadectomy and HX in male rats, but not in females. Additionally, GH injections or infusion did not alter Oat1 levels in HX rats. Oat2 mRNA levels, typically much higher in female than in male kidney, were unaffected by gonadectomy. However, HX dramatically decreased Oat2 in female kidney without altering male levels. GH administered by continuous infusion increased Oat2 in kidneys of both HX male and female rats, whereas injections had no affect. Gonadectomy reduced Oat3 mRNA levels in male livers without affecting levels in female livers. In contrast, HX decreased male and elevated female Oat3 mRNA. GH injections did not significantly change Oat3 mRNA levels in HX rats, but infusion decreased Oat3 mRNA in liver. In conclusion, androgens, but not GH, are responsible for the Oat1 mRNA gender difference in kidney; the female GH secretion pattern is responsible for the Oat2 mRNA gender difference in kidney; and both androgens and the female GH secretion pattern are responsible for the Oat3 mRNA gender difference in liver.
authors.affiliation: Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, Kansas 66160, USA.
authors.forename: Susan C N
authors.initials: SC
authors.lastname: Buist
authors.forename: Nathan J
authors.initials: NJ
authors.lastname: Cherrington
authors.forename: Curtis D
authors.initials: CD
authors.lastname: Klaassen
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000378:metabolism; D000072467:Cytochrome P450 Family 2; D004703:Endocrine System / Q000502:physiology*; D005260:Female; D013006:Growth Hormone / Q000494:pharmacology; D007668:Kidney / Q000254:growth & development / Q000378:metabolism; D008099:Liver / Q000254:growth & development / Q000378:metabolism; D008297:Male; D009919:Orchiectomy; D027362:Organic Anion Transport Protein 1 / Q000096:biosynthesis*; D029362:Organic Anion Transporters, Sodium-Independent / Q000096:biosynthesis*; D010052:Ovariectomy; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D017207:Rats, Sprague-Dawley; D012737:Sex Factors; D039181:Steroid 16-alpha-Hydroxylase / Q000378:metabolism; D013250:Steroid Hydroxylases / Q000378:metabolism
chemical_list: D027362:Organic Anion Transport Protein 1; D029362:Organic Anion Transporters, Sodium-Independent; D012333:RNA, Messenger; C088800:Slc22a7 protein, rat; C114338:organic anion transport protein 3; D013006:Growth Hormone; D013250:Steroid Hydroxylases; D001189:Aryl Hydrocarbon Hydroxylases; C450279:CYP2C11 protein, rat; D000072467:Cytochrome P450 Family 2; D039181:Steroid 16-alpha-Hydroxylase; C034694:steroid 15-beta-hydroxylase