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Catecholamine modulation of magnesium plasma levels in the rat
1Department of Pharmacology, New York Medical College, Valhalla 10595.
Archives Internationales De Pharmacodynamie Et De Therapie
|November 1, 1992
Summary
Catecholamines like epinephrine and isoproterenol do not significantly control plasma magnesium levels in rats. Blocking alpha- or beta-adrenoceptors did not alter magnesium, indicating no major role for these pathways.
Area of Science:
- Physiology
- Endocrinology
- Pharmacology
Background:
- Catecholamines are vital hormones and neurotransmitters.
- Their role in short-term plasma magnesium regulation is not fully understood.
Purpose of the Study:
- To investigate the role of catecholamines in short-term plasma magnesium control in rats.
- To determine if alpha- or beta-adrenoceptor blockade affects plasma magnesium levels during catecholamine infusion.
Main Methods:
- Rats were infused with epinephrine or isoproterenol.
- Alpha-adrenoceptors were blocked with phentolamine.
- Beta-adrenoceptors were blocked with propranolol.
- Plasma magnesium and potassium levels, and hemodynamic parameters were measured.
Main Results:
- Epinephrine infusion increased blood pressure and heart rate, decreased plasma potassium, but did not change plasma magnesium.
- Phentolamine administration led to dose-dependent increases in plasma magnesium.
- Propranolol blocked the hemodynamic and hypokalemic effects of catecholamines without altering plasma magnesium.
Conclusions:
- Catecholamines do not appear to play a major role in the short-term regulation of plasma magnesium in rats.
- Alpha-adrenoceptor blockade may influence plasma magnesium levels through mechanisms independent of direct catecholamine action.