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Lipid peroxidation in hepatic microsomal membranes isolated from mice in health and in experimental leishmaniasis
M Bagchi1, S Mukherjee, M K Basu
1Biomembrane Division, Indian Institute of Chemical Biology, Calcutta.
Abstract:
Normal hepatic microsomal membranes when exposed in vitro to different free radicals, cause membrane damage by lipid peroxidation which could be monitored by the analysis of malonaldehyde formation and measurement of membrane microviscosity. Lipid peroxidation in vivo, when examined in hepatic microsomal membranes in experimental Leishmaniasis, reveals a direct relationship between membrane microviscosity and the extent of lipid peroxidation. Scavengers of free radicals and peroxides such as superoxide dismutase (SOD) for O2.-, mannitol for (OH.) and catalase for H2O2 in modest amounts were used for preventing the membrane damage caused by lipid peroxidation.
Insights
Free radicals damage liver membranes via lipid peroxidation, increasing microviscosity. Antioxidants like superoxide dismutase (SOD) and catalase protect against this damage in Leishmaniasis.
Area of Science:
- Biochemistry
- Cell Biology
- Parasitology
Background:
- Hepatic microsomal membranes are susceptible to free radical-induced damage.
- Lipid peroxidation is a key mechanism of membrane damage.
- This damage can be quantified by malonaldehyde formation and changes in membrane microviscosity.
Purpose of the Study:
- To investigate the relationship between lipid peroxidation and membrane microviscosity in hepatic microsomal membranes.
- To examine the effects of free radicals on liver membranes in experimental Leishmaniasis.
- To evaluate the protective role of free radical scavengers against membrane damage.
Main Methods:
- In vitro exposure of hepatic microsomal membranes to free radicals.
- Monitoring lipid peroxidation via malonaldehyde analysis and membrane microviscosity measurements.
- In vivo examination of hepatic microsomal membranes in experimental Leishmaniasis models.
- Administration of free radical scavengers: superoxide dismutase (SOD), mannitol, and catalase.
Main Results:
- In vitro studies demonstrated that free radicals induce lipid peroxidation and alter membrane microviscosity.
- In vivo studies in experimental Leishmaniasis showed a direct correlation between increased membrane microviscosity and lipid peroxidation.
- Free radical scavengers effectively prevented membrane damage caused by lipid peroxidation.
Conclusions:
- Lipid peroxidation is a significant contributor to hepatic microsomal membrane damage.
- Membrane microviscosity serves as a reliable indicator of lipid peroxidation extent.
- Antioxidant therapies hold potential for mitigating free radical-induced liver damage, particularly in parasitic infections like Leishmaniasis.