Related Experiment Videos
Nonesterified fatty acids and lipid peroxidation
K A Balasubramanian1, S Nalini, M Manohar
1Wellcome Research Unit, Christian Medical College & Hospital, Vellore, India.
Molecular and Cellular Biochemistry
|April 1, 1992
Summary
Nonesterified fatty acids (NEFA), particularly oleic acid, protect gastrointestinal membranes from lipid peroxidation. These fatty acids prevent iron-induced cell damage by chelating iron, thus inhibiting free radical formation.
Area of Science:
- Biochemistry
- Cell Biology
- Gastroenterology
Background:
- Oxygen free radicals cause cellular damage via lipid peroxidation.
- Gastrointestinal mucosal membranes exhibit resistance to in vitro lipid peroxidation.
Purpose of the Study:
- To identify the protective factor in gastrointestinal membranes against lipid peroxidation.
- To elucidate the mechanism by which this factor inhibits peroxidation.
Main Methods:
- Isolation and chemical characterization of the protective factor.
- In vitro testing of authentic fatty acids and albumin-bound fatty acids using liver microsomes.
- Assessment of lipid peroxidation markers like malonaldehyde and conjugated diene production.
Main Results:
- Nonesterified fatty acids (NEFA), specifically oleic acid, were identified as the protective factor.
- NEFA inhibited lipid peroxidation, likely through iron chelation, forming non-peroxidative iron-fatty acid complexes.
- Gastrointestinal membranes contain high levels of NEFA; albumin-bound NEFA also inhibited iron-induced peroxidation.
Conclusions:
- Nonesterified fatty acids, especially monounsaturated ones, are key in preventing iron-induced lipid peroxidation in gastrointestinal membranes.
- The presence of NEFA in mucosal membranes and circulation contributes to cellular protection against oxidative stress.