title: Co-localization of P2Y1 receptor and NTPDase1/CD39 within caveolae in human placenta.
abstract: Nucleoside triphosphate diphosphohydrolase-1 (NTPDase1/CD39) is the dominant ecto-nucleotidase of vascular and placental trophoblastic tissues and appears to modulate the functional expression of type-2 purinergic (P2) G-protein coupled receptors (GPCRs). Hence, this ectoenzyme could regulate nucleotide-mediated signalling events in placental tissue. This immunohistochemical and immuno-electron microscopic study demonstrates the expression of NTPDase1/CD39, P2Y1 and P2Y2 receptors in different cell types of human placenta. Specifically P2Y1 has an exclusive vascular distribution whereas P2Y2 is localized on trophoblastic villi. Co-localization of P2Y1 and NTPDase1/CD39 are observed in caveolae, membrane microdomains of endothelial cells. The differential localization of these P2 receptors might indicate their unique roles in the regulation of extracellular nucleotide concentrations in human placental tissues and consequent effects on vascular tone and blood fluidity.
authors.affiliation: Department of Pharmacology, Institute of Experimental Medicine, Hungarian Academy of Sciences, P.O. Box 67, Budapest, Hungary. kittel@koki.hu
authors.forename: A
authors.initials: A
authors.lastname: Kittel
authors.forename: Z S
authors.initials: ZS
authors.lastname: Csapó
authors.forename: E
authors.initials: E
authors.lastname: Csizmadia
authors.forename: S W
authors.initials: SW
authors.lastname: Jackson
authors.forename: S C
authors.initials: SC
authors.lastname: Robson
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D001081:Apyrase; D021941:Caveolae / Q000201:enzymology* / Q000648:ultrastructure; D051242:Caveolin 1; D022461:Caveolins / Q000235:genetics / Q000378:metabolism / Q000648:ultrastructure; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D007150:Immunohistochemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D010920:Placenta / Q000201:enzymology* / Q000648:ultrastructure; D018048:Receptors, Purinergic P2 / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D058472:Receptors, Purinergic P2Y1; D058473:Receptors, Purinergic P2Y2
chemical_list: D015703:Antigens, CD; D051242:Caveolin 1; D022461:Caveolins; C546382:P2RY1 protein, human; C546385:P2RY2 protein, human; D018048:Receptors, Purinergic P2; D058472:Receptors, Purinergic P2Y1; D058473:Receptors, Purinergic P2Y2; D000251:Adenosine Triphosphatases; D001081:Apyrase; C067869:CD39 antigen