The effect of magnesium deficiency and excess on bovine coronary artery tone and responses to agonists

Kalsner, Stanley

doi:10.1111/j.1476-5381.1983.tb09413.x

British J Pharmacology

1983

DOI: 10.1111/j.1476-5381.1983.tb09413.x

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The effect of magnesium deficiency and excess on bovine coronary artery tone and responses to agonists

Stanley Kalsner

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1985

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Magnesium ions and oxytocin sensitivity of the male mouse anococcygeus

Gibson

1985

Journal of Pharmacy and Pharmacology

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The sensitivity of the mouse anococcygeus to contraction by oxytocin was shown to be Mg2+-dependent. Decreasing [Mg2+]0 from the optimal concentration of 1 to 0 mM caused a 20-fold parallel rightward displacement of the oxytocin dose-response curve. Contractions to oxytocin-related peptides (Arg-vasotocin, Arg-vasopressin and Lys-vasopressin) were also Mg2+-dependent, but those to other drugs (carbachol, methoxamine and thyrotrophin releasing hormone) were not. The onset of the potentiating effect of Mg2+ was rapid, full potentiation occurring within 70 s. 1-Deaminopenicillamine 8-ornithine-vasotocin produced competitive antagonism of responses to oxytocin, but was more potent in the absence (pA2 = 8.01) than in the presence of Mg2+ (1 mM; pA2 = 7.52). Thus, physiological concentrations of [Mg2+]0 enhanced oxytocin agonist potency but decreased oxytocin antagonist potency; possible mechanisms are discussed.

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Magnesium ions and oxytocin sensitivity of the male mouse anococcygeus

Gibson

1985

Journal of Pharmacy and Pharmacology

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The effect of magnesium deficiency and excess on bovine coronary artery tone and responses to agonists

Cited by 1 publication

References 25 publications

Magnesium ions and oxytocin sensitivity of the male mouse anococcygeus

Magnesium ions and oxytocin sensitivity of the male mouse anococcygeus

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