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Nitric oxide mediates brain mitochondrial damage during perinatal anoxia
J P Bolaños1, A Almeida, J M Medina
1Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universidad de Salamanca, Edificio Departamental, Campus Miguel de Unamuno, 37007 Salamanca, Spain. jbolanos@gugu.usal.es
Brain Research
|June 6, 1998
Summary
Nitric oxide (NO) contributes to brain energy deficits during perinatal asphyxia. Inhibiting NO synthesis protected neonatal rat brains from anoxia-induced mitochondrial damage and ATP depletion.
Area of Science:
- Neuroscience
- Biochemistry
- Perinatal Medicine
Background:
- Perinatal asphyxia can cause significant brain energy metabolism disruption.
- Nitric oxide (NO) is implicated in various physiological and pathological processes in the brain.
Purpose of the Study:
- To investigate the role of nitric oxide (NO) in brain energy metabolism during perinatal asphyxia in neonatal rats.
- To determine if NO mediates mitochondrial dysfunction and energy deficiency following anoxic insult.
Main Methods:
- Neonatal rats were exposed to 5 minutes of anoxia.
- Brain mitochondrial complex II-III activity, citrate synthase, complex I, and complex IV were measured.
- Adenosine triphosphate (ATP) levels, and nitrite/nitrate concentrations were assessed.
- Mothers were treated with N-omega-nitro-L-arginine methyl ester (L-NAME) to inhibit NO synthase.
Main Results:
- Anoxia significantly inhibited brain mitochondrial complex II-III activity (25%) and depleted ATP (54%).
- Anoxic insult increased nitrite and nitrate levels, indicating enhanced NO synthesis.
- L-NAME treatment reduced neonatal brain NO synthase activity and cyclic GMP levels.
- L-NAME-treated neonates were protected against anoxia-induced mitochondrial damage.
Conclusions:
- Brain mitochondrial dysfunction and energy deficiency during perinatal asphyxia are mediated by nitric oxide (NO).
- Inhibition of NO synthesis offers neuroprotection against anoxic brain injury.