title: Dopamine D3 receptors in rat juxtaglomerular cells.
abstract: D2-like receptors in the kidney have been suggested to be important in the regulation of renin release but the D2-like subtype(s) expressed in juxtaglomerular (JG) cells is not known. Therefore, we determined which of the D2-like family of dopamine receptors is located in primary cultures of rat juxtaglomerular (JG) cells. Reverse transcriptase-polymerase chain reaction (RT-PCR) identified D3 and D4 but not D2Long mRNA in JG cells (n = 3). D3 receptor function was demonstrated by a concentration-dependent inhibition of forskolin-stimulated cAMP production by LY-171555 (a non-selective D2-like receptor agonist) and PD-128593 (a partially selective D3 agonist) (n = 3-7/group). The stimulatory action of LY-171555 and PD-128593 we blocked by the non-selective D2-like antagonist YM-09151. We conclude that D3 and D4 dopamine receptor subtypes are expressed in JG cells; the receptor subtype linked to the inhibition of cAMP in JG cells remains to be established.
authors.affiliation: Department of Pathology, University of Virginia Center for the Health Sciences, Charlottesville 22908, USA.
authors.forename: H
authors.initials: H
authors.lastname: Sanada
authors.forename: L
authors.initials: L
authors.lastname: Yao
authors.forename: P A
authors.initials: PA
authors.lastname: Jose
authors.forename: R M
authors.initials: RM
authors.lastname: Carey
authors.forename: R A
authors.initials: RA
authors.lastname: Felder
mesh_terms: D000818:Animals; D001549:Benzamides / Q000494:pharmacology; D002478:Cells, Cultured; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D018491:Dopamine Agonists / Q000494:pharmacology; D018492:Dopamine Antagonists / Q000494:pharmacology; D007150:Immunohistochemistry; D007606:Juxtaglomerular Apparatus / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D016133:Polymerase Chain Reaction; D019257:Quinpirole / Q000494:pharmacology; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D017448:Receptors, Dopamine D2 / Q000235:genetics / Q000378:metabolism*; D050637:Receptors, Dopamine D3
chemical_list: D001549:Benzamides; D018491:Dopamine Agonists; D018492:Dopamine Antagonists; C493595:Drd3 protein, rat; D012333:RNA, Messenger; D017448:Receptors, Dopamine D2; D050637:Receptors, Dopamine D3; D005576:Colforsin; D019257:Quinpirole; D000242:Cyclic AMP; C030265:nemonapride