Norepinephrine evokes a marked Mg2+ efflux from liver cells |
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Authors: | A Romani A Scarpa |
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Institution: | Department of Physiology and Biophysics, Case Western Reserve University, School of Medicine, Cleveland, OH 44106. |
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Abstract: | The addition of norepinephrine to perfused rat livers and to collagenase isolated hepatocytes induced a marked and dose-dependent magnesium efflux. The addition of beta-adrenergic receptor antagonists, but not alpha-antagonists, completely blocked the Mg2+ efflux. The Mg2+ efflux could also be induced by forskolin and by permeable cAMP analogues. By contrast, the addition of carbachol or vasopressin induced a Mg2+ influx into isolated hepatocytes. These results indicate that a significant Mg2+ efflux from liver cells can be induced through the beta-adrenergic receptors and that it is mediated through the cytosolic cAMP levels. |
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