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Magnesium deficiency increases ketamine sensitivity in rats
B Orser1, D Smith, S Henderson
1Department of Anaesthesia, Sunnybrook Health Science Centre, University of Toronto. beverley.orscr@utoronto.ca
Summary
Magnesium deficiency increases sensitivity to ketamine, a drug affecting the NMDA receptor. Restoring magnesium levels reversed this heightened ketamine sensitivity in rats, indicating a crucial role for magnesium in modulating drug response.
Area of Science:
- Neuroscience
- Pharmacology
- Nutritional Science
Background:
- Ketamine's neurodepressive effects are linked to NMDA receptor inhibition.
- Magnesium also inhibits the NMDA receptor, potentially blocking ketamine binding.
Purpose of the Study:
- To investigate if magnesium deficiency enhances sensitivity to ketamine in vivo.
- To explore the interaction between magnesium levels and ketamine's effects on the NMDA receptor.
Main Methods:
- Rats were fed magnesium-deficient or control diets for 14 days.
- Ketamine potency was evaluated in hypomagnesemic rats.
- Ketamine sensitivity was re-assessed after magnesium repletion.
Main Results:
- Magnesium-deficient rats showed increased sensitivity to ketamine, including shorter time to loss of righting reflex and higher mortality.
- This heightened sensitivity was reversed upon magnesium repletion.
- Brain and plasma magnesium levels confirmed hypomagnesemia in deficient rats.
Conclusions:
- Hypomagnesemia is associated with increased sensitivity to ketamine.
- Magnesium status is a critical factor influencing ketamine's neurodepressive effects.