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Influence of Ca2+ on microsomal lipid peroxidation
1Free Radical Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India.
Indian Journal of Experimental Biology
|May 1, 1995
Summary
Calcium ions (Ca2+) significantly influence lipid peroxidation in mouse liver microsomes, with effects varying based on the initiation system and cofactor concentrations. These findings suggest potential in vivo relevance for calcium
Area of Science:
- Biochemistry
- Cell Biology
- Oxidative Stress Research
Background:
- Lipid peroxidation is a key indicator of oxidative stress.
- Microsomes are critical cellular components involved in metabolic processes.
- Calcium ions (Ca2+) play diverse roles in cellular signaling and function.
Purpose of the Study:
- To investigate the modulatory effects of Ca2+ on lipid peroxidation.
- To determine how Ca2+ influences lipid peroxidation initiated by different systems (NADPH, ascorbic acid, ferrous ions).
- To explore the potential in vivo implications of observed in vitro effects.
Main Methods:
- Preparation of liver microsomes from mice.
- Initiation of lipid peroxidation using NADPH, ascorbic acid, and ferrous ions.
- Assessment of Ca2+ effects on peroxidation rates at varying cofactor concentrations.
- Use of EGTA and ionophore A23187 to further probe Ca2+ mechanisms.
Main Results:
- Ca2+ demonstrated concentration-dependent modulation of lipid peroxidation across all tested systems.
- In the ascorbate system, Ca2+ initially enhanced then inhibited peroxidation.
- Ca2+ consistently increased NADPH-dependent peroxidation and showed variable effects on ferrous ion-initiated peroxidation.
- Ca2+ enhanced peroxidation in the absence of cofactors, an effect inhibited by EGTA but potentiated by ionophore A23187.
Conclusions:
- Ca2+ significantly modulates lipid peroxidation in a manner dependent on the initiation system and cofactor concentrations.
- The observed in vitro effects of Ca2+ on lipid peroxidation suggest potential relevance for animal systems.
- Ca2+ likely exerts its influence through indirect biochemical pathways or membrane interactions rather than direct participation in the peroxidation process.