Nitric oxide-dependent vasodilation induced by minoxidil in isolated rat aorta. 2021

Soo Hee Lee, and Seong-Ho Ok, and Dawon Kang, and Hyun-Jin Kim, and Seung Hyun Ahn, and Sung Il Bae, and Ji-Yoon Kim, and Eun-Jin Kim, and Sunmin Kim, and Yeran Hwag, and Ju-Tae Sohn
Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea.

We examined the effect of endothelium and lipid emulsion on vasodilation induced by minoxidil at a toxic dose and determined the underlying mechanism. The effects of endothelial denudation, NW-nitro-L-arginine methyl ester (L-NAME), methylene blue, 1H-[1,2,4]oxadiazolo[4,3-a] quinoxalin-1-one (ODQ), and glibenclamide, alone or in combination, on minoxidil-induced vasodilation in endothelium-intact rat aorta were examined. Additionally, the effects of lipid emulsion on minoxidil-induced membrane hyperpolarization and minoxidil concentration were examined. The vasodilatory effects of minoxidil at the toxic dose were higher in endothelium-intact aorta than in endothelium-denuded aorta. L-NAME, methylene blue, ODQ, and glibenclamide attenuated minoxidil-induced vasodilation of endothelium-intact rat aorta. Combined treatment with L-NAME and glibenclamide almost eliminated minoxidil-induced vasodilation. However, lipid emulsion pretreatment did not significantly alter minoxidil-induced vasodilation. Lipid emulsion did not significantly alter minoxidil-induced membrane hyperpolarization and minoxidil concentration. Overall, minoxidil-induced vasodilation is mediated by ATP-sensitive potassium channels and pathways involving nitric oxide and guanylate cyclase.

UI MeSH Term Description Entries
D008914 Minoxidil A potent direct-acting peripheral vasodilator (VASODILATOR AGENTS) that reduces peripheral resistance and produces a fall in BLOOD PRESSURE. (From Martindale, The Extra Pharmacopoeia, 30th ed, p371) Loniten,Regaine,Rogaine,U 10858
D009569 Nitric Oxide A free radical gas produced endogenously by a variety of mammalian cells, synthesized from ARGININE by NITRIC OXIDE SYNTHASE. Nitric oxide is one of the ENDOTHELIUM-DEPENDENT RELAXING FACTORS released by the vascular endothelium and mediates VASODILATION. It also inhibits platelet aggregation, induces disaggregation of aggregated platelets, and inhibits platelet adhesion to the vascular endothelium. Nitric oxide activates cytosolic GUANYLATE CYCLASE and thus elevates intracellular levels of CYCLIC GMP. Endogenous Nitrate Vasodilator,Mononitrogen Monoxide,Nitric Oxide, Endothelium-Derived,Nitrogen Monoxide,Endothelium-Derived Nitric Oxide,Monoxide, Mononitrogen,Monoxide, Nitrogen,Nitrate Vasodilator, Endogenous,Nitric Oxide, Endothelium Derived,Oxide, Nitric,Vasodilator, Endogenous Nitrate
D004730 Endothelium, Vascular Single pavement layer of cells which line the luminal surface of the entire vascular system and regulate the transport of macromolecules and blood components. Capillary Endothelium,Vascular Endothelium,Capillary Endotheliums,Endothelium, Capillary,Endotheliums, Capillary,Endotheliums, Vascular,Vascular Endotheliums
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001011 Aorta The main trunk of the systemic arteries. Aortas
D014664 Vasodilation The physiological widening of BLOOD VESSELS by relaxing the underlying VASCULAR SMOOTH MUSCLE. Vasodilatation,Vasorelaxation,Vascular Endothelium-Dependent Relaxation,Endothelium-Dependent Relaxation, Vascular,Relaxation, Vascular Endothelium-Dependent,Vascular Endothelium Dependent Relaxation
D051381 Rats The common name for the genus Rattus. Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus
D052250 Nitric Oxide Synthase Type III A CALCIUM-dependent, constitutively-expressed form of nitric oxide synthase found primarily in ENDOTHELIAL CELLS. ECNOS Enzyme,ENOS Enzyme,Endothelial Constitutive Nitric Oxide Synthase,Endothelial Nitric Oxide Synthase,Nitric Oxide Synthase, Type III
D019331 NG-Nitroarginine Methyl Ester A non-selective inhibitor of nitric oxide synthase. It has been used experimentally to induce hypertension. L-NAME,N omega-Nitro-L-arginine Methyl Ester,NG-Nitro-L-Arginine Methyl Ester,N(G)-Nitro-L-arginine Methyl Ester,N(G)-Nitroarginine Methyl Ester,N(omega)-Nitro-L-arginine Methyl Ester,NG-Nitroarginine Methyl Ester, D-Orn-Isomer,NG-Nitroarginine Methyl Ester, L-Orn-Isomer, Monohydrochloride,Methyl Ester, NG-Nitro-L-Arginine,Methyl Ester, NG-Nitroarginine,N omega Nitro L arginine Methyl Ester,NG Nitro L Arginine Methyl Ester,NG Nitroarginine Methyl Ester,NG Nitroarginine Methyl Ester, D Orn Isomer

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