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Updated: Aug 23, 2026
Modeling Posthemorrhagic Hydrocephalus of Prematurity in Rats
Published on: March 28, 2025
Acute hydrocephalus upregulates monoamine oxidase mRNA in neonatal rat brain
Meng-Fai Kuo1, Kwan-Dun Wu, Ruei-Meei Wu
1Department of Neurosurgery, National Taiwan University Hospital and National Taiwan University College of Medicine, 7, Chang-Shan South Road, Taipei, Taiwan.
Abstract:
Metabolic derangement of the dopamine system in hydrocephalic brain has been observed, but the change of monoamine oxidase (MAO), the major enzyme to metabolize dopamine, is not known. The metabolic changes of dopamine and MAO mRNA in the striatum were examined in acute hydrocephalic rats whose ventricular size and intracranial pressure were controlled to a similar degree. The tissue levels of dopamine and its metabolites as well as MAO-A and MAO-B mRNA elevated significantly in hydrocephalus. Cerebrospinal fluid (CSF) diversion reversed these changes and induced an initial decline, followed by an elevation of these substances in extracellular fluid. In summary, the metabolism of dopamine system in the striatum was up-regulated in acute hydrocephalus and CSF diversion reversed this metabolic derangement.
Insights
Acute hydrocephalus up-regulates dopamine metabolism in the brain. Cerebrospinal fluid diversion reverses this metabolic derangement, offering insights into dopamine system regulation in neurological conditions.
Area of Science:
- Neuroscience
- Biochemistry
Background:
- Metabolic alterations in the dopamine system are noted in hydrocephalus.
- The role of monoamine oxidase (MAO) in dopamine metabolism during hydrocephalus remains unclear.
Purpose of the Study:
- To investigate the changes in dopamine and MAO mRNA levels in the striatum of rats with acute hydrocephalus.
- To determine the effect of cerebrospinal fluid (CSF) diversion on these metabolic changes.
Main Methods:
- Acute hydrocephalus was induced in rats with controlled ventricular size and intracranial pressure.
- Dopamine levels, its metabolites, and MAO-A and MAO-B mRNA were quantified in the striatum.
- The impact of CSF diversion on these parameters in tissue and extracellular fluid was analyzed.
Main Results:
- Hydrocephalus led to significant increases in striatal dopamine, its metabolites, and MAO-A/B mRNA.
- CSF diversion initially decreased these substances, followed by a subsequent elevation in extracellular fluid.
- These findings indicate an up-regulation of dopamine metabolism in the hydrocephalic striatum.
Conclusions:
- Dopamine metabolism is significantly up-regulated in the striatum during acute hydrocephalus.
- Cerebrospinal fluid diversion effectively reverses this metabolic derangement, suggesting a therapeutic potential.
