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Melatonin reduces protein and lipid oxidative damage induced by homocysteine in rat brain homogenates
Santiago Ortega-Gutiérrez1, Lorena Fuentes-Broto, Joaquín J García
1Department of Pharmacology and Physiology, University of Zaragoza, Zaragoza, Spain.
Insights
Melatonin, a potent antioxidant, protects against homocysteine-induced oxidative damage in rat brain homogenates. This suggests melatonin may help prevent cardiovascular and cerebrovascular diseases linked to high homocysteine levels.
Area of Science:
- Neuroscience
- Cardiovascular Science
- Biochemistry
Background:
- Hyperhomocysteinemia is a known risk factor for cardiovascular and cerebrovascular diseases.
- Homocysteine (HCY) impairs cerebrovascular function by generating free radicals, contributing to oxidative stress.
- Melatonin is recognized for its antioxidant properties and ability to reduce plasma HCY concentrations.
Purpose of the Study:
- To investigate the protective effects of melatonin against homocysteine-induced protein and lipid oxidation in rat brain homogenates.
- To determine if melatonin can mitigate oxidative damage caused by elevated homocysteine levels in neural tissue.
Main Methods:
- Rat brain homogenates were prepared from Sprague-Dawley rats.
- Homogenates were incubated with varying concentrations of homocysteine (HCY) and melatonin.
- Protein oxidation was assessed by measuring carbonyl content; lipid oxidation was measured by quantifying malondialdehyde (MDA) and 4-hydroxyalkenals (4-HDA).
Main Results:
- Homocysteine (0.01-5 mM) significantly increased protein carbonyl content and MDA+4-HDA formation in brain homogenates.
- Melatonin demonstrated a concentration-dependent reduction in HCY-induced protein and lipid oxidation.
- These findings indicate melatonin's efficacy in preventing oxidative damage in brain tissue.
Conclusions:
- Melatonin effectively prevents homocysteine-induced oxidative damage to proteins and lipids in rat brain homogenates.
- This antioxidant action represents a potential mechanism through which melatonin may reduce the risk of cardiovascular and cerebrovascular diseases associated with hyperhomocysteinemia.
- Further research into melatonin's therapeutic potential for managing hyperhomocysteinemia-related conditions is warranted.
Abstract:
Numerous data indicate that hyperhomocysteinemia is a risk factor for cardio- and cerebrovascular diseases. At least in part, homocysteine (HCY) impairs cerebrovascular function because it generates large numbers of free radicals. Since melatonin is a well-known antioxidant, which reduces oxidative stress and decreases HCY concentrations in plasma, the aim of this study was to investigate the effect of melatonin in preventing HCY-induced protein and lipid oxidation in rat brain homogenates. Brain homogenates were obtained from Sprague-Dawley rats and were incubated with or without HCY (0.01-5 mM) or melatonin (0.01-3 mM). Carbonyl content of proteins, and malondialdehyde (MDA) and 4-hydroxyalkenals (4-HDA) concentrations in the brain homogenates were used as an index of protein and lipid oxidation, respectively. Under the experimental conditions used, the addition of HCY (0.01-5 mM) to the homogenates enhanced carbonyl protein and MDA+4-HDA formation. Melatonin reduced, in a concentration-dependent manner, protein and lipid oxidation due to HCY in the brain homogenates. These data suggest that preserving proteins from oxidative insults is an additional mechanism by which melatonin may act as an agent in potentially decreasing cardiovascular and cerebrovascular diseases related to hyperhomocysteinemia.