Dietary Mg(2+) supplementation restores impaired vasoactive responses in isolated rat aorta induced by chronic ethanol consumption.


Chronic ethanol consumption contributes to cardiovascular dysfunction possibly related to loss of Mg(2+). This study was designed to examine the role of dietary Mg(2+) supplementation on chronic ethanol ingestion-induced vascular alteration. Rats were fed an ethanol liquid diet supplemented with or without Mg(2+) for 12 weeks. The force-generating capacity was examined in thoracic aortic rings. Ethanol-consuming animals exhibited significantly elevated blood pressure. In aorta with intact endothelium, the contractile responses to norepinephrine and KCl were greatly attenuated and potentiated, respectively. Interestingly, the ethanol-induced alterations in blood pressure and vasoconstrictive response were restored by Mg(2+) supplementation. Pretreatment with the beta(1)-adrenoceptor antagonist atenolol in intact aortic rings abolished the difference in response to norepinephrine between the control and ethanol groups, which implies the involvement of a weakened beta(1)-adrenoceptor component in vessels from the ethanol-fed rats. The norepinephrine-induced vasoconstriction in intact aorta rings was completely abolished by the alpha(1)-adrenoceptor antagonist prazosin. In endothelium-denuded aorta, the contractile response to norepinephrine or KCl was not significantly different between the ethanol and Mg(2+) groups. Endothelium-dependent vasorelaxation to carbamylcholine chloride was not altered by either ethanol or Mg(2+) supplementation. Sodium nitroprusside-induced vasorelaxation was depressed by ethanol, and restored by Mg(2+), in aorta with or without endothelium. These data suggest that chronic ethanol consumption contributes to alterations of endothelium-dependent and -independent vascular response. These alterations can be compensated by dietary Mg(2+) supplementation.

6 Figures and Tables


Citations per Year

213 Citations

Semantic Scholar estimates that this publication has 213 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Brown2002DietaryMS, title={Dietary Mg(2+) supplementation restores impaired vasoactive responses in isolated rat aorta induced by chronic ethanol consumption.}, author={Ricardo A. Brown and Karl J Ilg and Alex F. Chen and Jun Ren}, journal={European journal of pharmacology}, year={2002}, volume={442 3}, pages={241-50} }