title: Testosterone regulation of platelet and vascular thromboxane A2 receptors.
abstract: Testosterone has been implicated as a risk factor for cardiovascular diseases and thromboxane A2 (TXA2) plays a role in these diseases. We tested the notion that testosterone regulates the expression of TXA2 receptors in platelets and vascular smooth muscle. Testosterone significantly increased the density of TXA2 receptors in cultured rat aortic smooth muscle and human erythroleukemia cells, a megakaryocyte-like cell. Treatment of rats with testosterone resulted in a significant increase in platelet and aortic TXA2 receptor density and increased responsiveness to TXA2 mimetics. We conclude that testosterone regulates the expression of TXA2 receptors.
authors.affiliation: Department of Pharmacology, Medical University of South Carolina, Charleston 29425.
authors.forename: P V
authors.initials: PV
authors.lastname: Halushka
authors.forename: K
authors.initials: K
authors.lastname: Matsuda
authors.forename: A
authors.initials: A
authors.lastname: Masuda
authors.forename: A
authors.initials: A
authors.lastname: Ruff
authors.forename: T A
authors.initials: TA
authors.lastname: Morinelli
authors.forename: R S
authors.initials: RS
authors.lastname: Mathur
mesh_terms: D000818:Animals; D001011:Aorta; D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism; D002369:Castration; D002478:Cells, Cultured; D008297:Male; D008533:Megakaryocytes / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects; D009131:Muscle, Smooth, Vascular / Q000187:drug effects*; D011863:Radioimmunoassay; D011869:Radioligand Assay; D051381:Rats; D017482:Receptors, Thromboxane / Q000187:drug effects* / Q000378:metabolism; D013739:Testosterone / Q000494:pharmacology*
chemical_list: D017482:Receptors, Thromboxane; D013739:Testosterone