Oxidative Stress Mechanisms in Animal Models of Bipolar Disorder

Bipolar disorder is marked by alternating manic and depressive episodes thought to arise in part from imbalances between pro-oxidant and antioxidant systems in the brain. In animal models, pharmacological or genetic manipulations provoke mood-like behaviours accompanied by excessive formation of reactive oxygen species, impaired mitochondrial energy production and accumulation of oxidative modifications to lipids, proteins and nucleic acids. Common paradigms include intracerebroventricular administration of ouabain to inhibit the Na⁺/K⁺-ATPase, transgenic disruption of glial or neuronal antioxidant defences, and dietary or environmental challenges that deplete endogenous thiol reserves. In these systems, elevated reactive oxygen species provoke lipid peroxidation, trigger inflammatory cascades and compromise mitochondrial electron transport chain activity. Markers such as nitrotyrosine and protein carbonyls accumulate in hippocampal and cortical regions, correlating with hyperlocomotion, anhedonia or behavioural despair. Restoration of redox balance through genetic upregulation of sirtuin-1 signalling, pharmacological antioxidants or inhibition of matrix metalloproteinases mitigates both oxidative damage and behavioural abnormalities. These findings underscore the interplay between ionic pump dysfunction, mitochondrial impairment and oxidative stress in driving mood-related phenotypes, offering routes to novel interventions that bolster antioxidant defences in bipolar disorder.

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Oxidative Stress Mechanisms in Animal Models of Bipolar Disorder publication trend

The graph below shows the total number of articles in oxidative stress mechanisms in animal models of bipolar disorder across all publications each year (not limited to Nature Index journals).

Technical terms

Reactive oxygen species (ROS): Highly reactive molecules derived from oxygen that can damage cellular components.

Lipid peroxidation: Oxidative degradation of lipids leading to cell membrane dysfunction.

Nitrotyrosine: A marker of protein oxidation formed by peroxynitrite-mediated nitration of tyrosine residues.

Ouabain: A cardiac glycoside that inhibits Na⁺/K⁺-ATPase, used experimentally to induce mood-related phenotypes.

Sirtuin-1 (SIRT-1): A NAD⁺-dependent deacetylase involved in mitochondrial function, stress resistance and cellular longevity.

References

1. Inhibition of MMP8 effectively alleviates manic-like behavior and reduces neuroinflammation by modulating astrocytic CEBPD. Journal of Neuroinflammation (2024).
2. Validation of the animal model of bipolar disorder induced by Ouabain: face, construct and predictive perspectives. Translational Psychiatry (2019).
3. Activating SIRT-1 Signalling with the Mitochondrial-CoQ10 Activator Solanesol Improves Neurobehavioral and Neurochemical Defects in Ouabain-Induced Experimental Model of Bipolar Disorder. Pharmaceuticals (2022).