Contraction of Arterial Smooth Muscle of Normotensive and Spontaneously Hypertensive Rats by Manganese(III)tetrakis(1-methyl-4-pyridyl)porphyrin (MnTMPyP)

[摘要] References(15)Cited-By(3)Manganese(III)tetrakis(1-methyl-4-pyridyl)porphyrin (MnTMPyP), which has been known as a cell permeable superoxide dismutase mimetic, induced concentration-dependent contraction in rat carotid artery acting directly on smooth muscle. The contractile action was more prominent in the preparation from stroke-prone spontaneously hypertensive rats (SHRSP) compared with that from Wistar Kyoto rats (WKY). It was abolished by the removal of extracellular Ca2+ or the application of verapamil. These results suggest that the MnTMPyP-induced contraction is brought about by Ca2+ influx through voltage-dependent Ca2+ channels (VDCC) and that the difference in VDCC is the cause of the difference in MnTMPyP action between preparations from WKY and SHRSP.

[学科分类] 药学

[关键词] manganese(III)tetrakis(1-methyl-4-pyridyl)porphyrin (MnTMPyP);carotid artery;stroke-prone spontaneously hypertensive rats