Abstract
We have investigated the level of lipid peroxidation (LPO) in rat brain homogenates in the presence of nitric oxide (NO) which was released by the addition of sodium nitroprusside (SNP) and compared it with that induced by H 2O 2. We also examined the effect of melatonin and vitamin E on the NO-induced LPO. The concentration of malonaldehyde (MDA) plus 4-hydroxyalkenals (4-HDA) was used as an index of LPO. While both H 2O 2 and SNP increased MDA+4-HDA production in brain homogenates in a concentration-dependent manner, SNP was more potent than H 2O 2 at all concentrations tested. Both melatonin or vitamin E reduced NO-induced LPO in a dose-dependent manner in concentrations ranging from 10 μM to 10 mM. Under the in vitro conditions of this experiment, vitamin E was more efficient than melatonin in limiting NO-induced LPO in rat brain homogenates.
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