Related Experiment Videos
Melatonin protects against oxidative stress induced by the kidney carcinogen KBrO(3)
1Department of Zoology, Faculty of Science, Assiut University, Assiut, 71516 Egypt. EL-SOKKARY@USA.NET
Abstract:
OBJECTIVES: Free radical scavengers can protect against the genotoxicity induced by chemical carcinogens by decreasing oxidative stress. The protective effect of the antioxidant melatonin was studied in the kidney and liver of rats treated with the kidney-specific carcinogen potassium bromate (KBrO(3)). The major endpoint of oxidative damage measured in this report was lipid peroxidation. METHODS: Four groups of male rats (controls, melatonin-injected [10 mg/kg x4], KBrO(3)-injected [100 mg/kg], and melatonin+-KBrO(3)) were used in the current study. The concentrations of malondialdehyde (MDA) were assayed as an index of oxidatively damaged lipid in the kidney and liver. RESULTS: Twenty-four hours after KBrO(3) administration, MDA levels were significantly increased in the kidney while the increase in the liver was not statistically significant compared to levels in control rats. The percentage increases in lipid peroxidation products were 32.8% and 12.6% for the kidney and liver, respectively. In rats given melatonin 30 minutes before KBrO(3), and three more times after KBrO(3) (i.e., every 6 hours), the increase in MDA levels was reduced in the kidney. Histopathological examination demonstrated marked changes in the structure of the kidney and slight changes in the liver. In the kidney, microscopic examination revealed atypical tubules, atypical hyperplasia, hyaline droplet degeneration, necrotic changes and stratified squamous cell metaplasia. Again, melatonin treatment inhibited the tissue damage associated with KBrO(3) administration. CONCLUSION: These results show that melatonin as an antioxidant and free radical scavenger can prevent oxidative stress induced by the carcinogen KBrO(3).
Insights
Melatonin, an antioxidant, protects against kidney and liver damage caused by the carcinogen potassium bromate by reducing oxidative stress and lipid peroxidation.
Area of Science:
- Toxicology
- Biochemistry
- Pharmacology
Background:
- Chemical carcinogens can induce genotoxicity through oxidative stress.
- Antioxidants like melatonin may mitigate damage from carcinogens.
- Potassium bromate (KBrO(3)) is a kidney-specific carcinogen that causes oxidative damage.
Purpose of the Study:
- To investigate the protective effects of melatonin against potassium bromate-induced oxidative stress and genotoxicity in rat kidneys and livers.
- To measure lipid peroxidation as a key indicator of oxidative damage.
Main Methods:
- Male rats were divided into four groups: control, melatonin-injected, KBrO(3)-injected, and melatonin + KBrO(3).
- Malondialdehyde (MDA) levels were measured in kidney and liver tissues as a marker of lipid peroxidation.
- Histopathological examinations were performed to assess tissue damage.
Main Results:
- KBrO(3) significantly increased MDA levels in the kidney (32.8%) but not in the liver (12.6%).
- Melatonin administration prior to and after KBrO(3) treatment reduced MDA levels in the kidney.
- Histopathology revealed significant kidney damage (atypical tubules, hyperplasia, necrosis) and minor liver changes, which were attenuated by melatonin.
Conclusions:
- Melatonin acts as an effective antioxidant and free radical scavenger.
- Melatonin can prevent oxidative stress and inhibit tissue damage induced by the carcinogen KBrO(3).
- These findings highlight melatonin's potential protective role against carcinogen-induced organ damage.