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[Magnesium and N-type calcium channel]
Tatsuo Shimosawa1, Toshiro Fujita
1University of Tokyo, Faculty of Medicine.
Clinical Calcium
|February 5, 2005
Summary
Magnesium inhibits norepinephrine release from sympathetic nerves by blocking N-type calcium channels, potentially explaining its protective effects in heart attacks and offering new hypertension treatments.
Area of Science:
- Cardiovascular Physiology
- Neuropharmacology
Context:
- Magnesium is known to affect vascular smooth muscle cells by inhibiting L-type calcium channels, leading to vasodilation and hypotension.
- Existing research suggests magnesium modulates baroreceptor function, hinting at its influence on autonomic regulation.
Purpose:
- To investigate the inhibitory effect of magnesium on sympathetic tone.
- To elucidate the specific calcium channel involved in magnesium's modulation of norepinephrine release.
Summary:
- Magnesium was demonstrated to inhibit norepinephrine release from peripheral sympathetic nerve endings.
- This inhibitory effect is mediated by the blockade of calcium influx through N-type calcium channels.
Impact:
- The findings may explain the organ-protective effects of magnesium observed in acute myocardial infarction.
- Magnesium's mechanism of action presents a potential new therapeutic target for managing hypertension.