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Effect of lipoic acid administration on gentamicin-induced lipid peroxidation in rats
1Department of Medical Biochemistry, Post Graduate Institute of Basic Medical Sciences, University of Madras, Taramani Campus, India.
Abstract:
The intraperitoneal administration of gentamicin (100 mg kg[-1] day[-1]) to rats is associated with an increased production of malondialdehyde (MDA), which is an end product of lipid peroxidation in the kidney. The level of glutathione (GSH) and the activity of three antioxidant systems--superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx)--were also decreased in the kidney. The liver, however, did not show any such alterations. Gentamicin (100 mg kg[-1] day[-1]) plus lipoic acid administration (25 mg kg[-1] day[-1]) by gastric intubation brought about a decrease in the degree of lipid peroxidation. An increase in the GSH level and in the activity of SOD, CAT and GPx was also observed. From these observations it can be concluded that administration of DL-alpha-lipoic acid prevents lipid peroxidation, which may, at least partly, play an important role in the injury cascade of gentamicin-induced nephrotoxicity.
Insights
Gentamicin causes kidney damage by increasing lipid peroxidation and decreasing antioxidants. Lipoic acid administration prevented these harmful effects, suggesting a protective role against gentamicin-induced nephrotoxicity.
Area of Science:
- Nephrology
- Toxicology
- Biochemistry
Background:
- Gentamicin administration in rats increases malondialdehyde (MDA), a marker of lipid peroxidation, in the kidney.
- Kidney levels of glutathione (GSH) and antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase) are decreased by gentamicin.
- Liver tissues do not exhibit these gentamicin-induced alterations.
Purpose of the Study:
- To investigate the protective effects of DL-alpha-lipoic acid against gentamicin-induced nephrotoxicity in rats.
- To determine if lipoic acid can mitigate oxidative stress markers in the kidney.
Main Methods:
- Rats were administered gentamicin intraperitoneally (100 mg kg[-1] day[-1]).
- A separate group received gentamicin plus DL-alpha-lipoic acid (25 mg kg[-1] day[-1]) via gastric intubation.
- Kidney tissue was analyzed for malondialdehyde (MDA) levels, glutathione (GSH) content, and the activity of antioxidant enzymes (SOD, CAT, GPx).
Main Results:
- Gentamicin treatment significantly increased MDA production and decreased GSH levels and antioxidant enzyme activities in rat kidneys.
- Co-administration of DL-alpha-lipoic acid with gentamicin reduced MDA levels.
- Lipoic acid administration also led to an increase in GSH levels and the activity of SOD, CAT, and GPx in the kidneys.
Conclusions:
- DL-alpha-lipoic acid administration effectively prevents lipid peroxidation in the kidney.
- These findings suggest that lipoic acid may play a significant role in preventing gentamicin-induced nephrotoxicity by combating oxidative stress.