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Enhancement of gentamicin nephrotoxicity by magnesium depletion in the rat
Abstract:
This study examined the possible enhancement of gentamicin-induced nephrotoxicity by coexisting magnesium depletion. The effect of concurrent magnesium depletion on enhancing gentamicin-induced nephrotoxicity was measured by azotemia and mortality contrasted to magnesium repleted control rats also receiving gentamicin. After 28 days of dietary preparation, magnesium depleted rats and their magnesium repleted controls were each subdivided into 3 groups: (1) saline injection (NS); (2) gentamicin 80 mg/kg/day, and (3) gentamicin 120 mg/kg/day. Injections were continued for 14 days. All rats receiving gentamicin had proteinuria, increased mortality and significant renal morphological abnormalities. However, those rats which were concurrently magnesium depleted had statistically significant increments in BUN levels, more apparent renal tubular damage, and earlier mortality than the magnesium repleted controls. These observations support the view that concurrent magnesium deficiency in the rat enhanced gentamicin nephrotoxicity.
Insights
Magnesium depletion worsens gentamicin-induced kidney damage in rats. This study found that magnesium deficiency significantly increased azotemia, renal tubular damage, and mortality in rats treated with gentamicin.
Area of Science:
- Nephrology
- Toxicology
- Biochemistry
Background:
- Gentamicin is a widely used antibiotic with known nephrotoxic potential.
- Magnesium is an essential mineral that plays a crucial role in cellular functions and kidney health.
- The interaction between magnesium levels and gentamicin nephrotoxicity is not fully understood.
Purpose of the Study:
- To investigate whether concurrent magnesium depletion enhances gentamicin-induced nephrotoxicity in a rat model.
- To quantify the effects of magnesium deficiency on markers of kidney injury and survival in rats receiving gentamicin.
Main Methods:
- Rats were subjected to either magnesium depletion or magnesium repletion diets for 28 days.
- Following dietary preparation, rats were divided into groups and administered saline, or gentamicin at 80 mg/kg/day or 120 mg/kg/day for 14 days.
- Nephrotoxicity was assessed by measuring blood urea nitrogen (BUN) levels, proteinuria, mortality rates, and renal morphological abnormalities.
Main Results:
- All rats receiving gentamicin exhibited proteinuria, increased mortality, and renal abnormalities.
- Magnesium-depleted rats demonstrated statistically significant increases in BUN levels compared to magnesium-repleted controls.
- Magnesium-depleted rats showed more pronounced renal tubular damage and experienced earlier mortality.
Conclusions:
- Concurrent magnesium deficiency significantly enhances gentamicin-induced nephrotoxicity in rats.
- Magnesium plays a protective role against gentamicin-induced kidney injury.
- Maintaining adequate magnesium levels may be important for mitigating gentamicin's adverse renal effects.