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Lipid peroxidation in liver and colon of methylazoxymethanol treated rats
Abstract:
Weanling male Sprague-Dawley rats were injected via the tail vein with methylazoxymethanol (MAM) acetate at a dose of 70 mg/kg body weight. Measurements of lipid peroxidation were carried out on mitochondrial and microsomal fractions of liver and colonic mucosa at various intervals over the first 24 h following delivery of the carcinogen. Significantly increased levels of peroxidation were observed 3-6 h after treatment in microsomal and mitochondrial fractions of both these tissues. A return to control levels was seen by the end of the first day. These results are discussed in relation to the role of lipid peroxidation in carcinogenesis and the proposed mechanism of tumor prevention by selenium.
Insights
Methylazoxymethanol acetate (MAM) induced significant lipid peroxidation in rat liver and colon microsomes within hours. This early oxidative damage is relevant to carcinogenesis and potential selenium-mediated tumor prevention.
Area of Science:
- Biochemistry
- Toxicology
- Carcinogenesis
Background:
- Lipid peroxidation is implicated in the mechanism of chemical carcinogenesis.
- Selenium compounds are known to possess chemopreventive properties against certain cancers.
Purpose of the Study:
- To investigate the early effects of methylazoxymethanol acetate (MAM) on lipid peroxidation in rat liver and colonic mucosa.
- To explore the relationship between MAM-induced oxidative stress and potential selenium-mediated tumor prevention.
Main Methods:
- Weanling male Sprague-Dawley rats were administered MAM acetate (70 mg/kg) via tail vein injection.
- Lipid peroxidation levels were measured in mitochondrial and microsomal fractions of liver and colonic mucosa at 24-hour intervals.
- Assays were conducted at various time points post-MAM administration.
Main Results:
- Significantly elevated lipid peroxidation was observed in both liver and colonic microsomal and mitochondrial fractions 3-6 hours after MAM acetate treatment.
- Lipid peroxidation levels returned to control values by the end of the first 24-hour period.
- The findings highlight the rapid induction of oxidative stress by MAM acetate.
Conclusions:
- MAM acetate induces acute lipid peroxidation in rat liver and colonic tissues.
- These early oxidative changes are relevant to the initiation phase of carcinogenesis.
- The study provides a basis for understanding the role of selenium in preventing MAM-induced carcinogenesis.