title: Testosterone acts as a coronary vasodilator by a calcium antagonistic action.
abstract: T acts as a vasodilator in vitro and in vivo. Supplemental T therapy in humans with angina improves symptoms and reduces objective measures of ischemia. In left anterior descending coronary arteries taken from adult male Wistar rats, T abolishes 100+/-4.2% of calcium-dependent contraction induced by potassium chloride, 82.3+/-6.1% of the mostly calcium-dependent contraction induced by prostaglandin-F-2-alpha, but only 45.3+/-3.4% of the contraction induced by phorbol-12,13-dibutyrate (PDBu) in the presence of extracellular calcium, and 54.5+/-4.5% of the contraction induced by PDBu in the absence of extracellular calcium. These findings suggest that T is primarily inhibiting the calcium-dependent elements of vascular contraction.
authors.affiliation: Department of Cardiology, Royal Hallamshire Hospital, Sheffield, UK.
authors.forename: K M
authors.initials: KM
authors.lastname: English
authors.forename: R D
authors.initials: RD
authors.lastname: Jones
authors.forename: T H
authors.initials: TH
authors.lastname: Jones
authors.forename: A H
authors.initials: AH
authors.lastname: Morice
authors.forename: K S
authors.initials: KS
authors.lastname: Channer
mesh_terms: D000818:Animals; D002121:Calcium Channel Blockers / Q000494:pharmacology*; D003326:Coronary Circulation / Q000187:drug effects* / Q000502:physiology*; D015237:Dinoprost / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D015240:Phorbol 12,13-Dibutyrate / Q000494:pharmacology; D011189:Potassium Chloride / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D013739:Testosterone / Q000494:pharmacology*; D014664:Vasodilation; D014665:Vasodilator Agents / Q000494:pharmacology*; D014666:Vasomotor System / Q000187:drug effects
chemical_list: D002121:Calcium Channel Blockers; D014665:Vasodilator Agents; D015240:Phorbol 12,13-Dibutyrate; D013739:Testosterone; D011189:Potassium Chloride; D015237:Dinoprost