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Neurochemical findings in Huntington's chorea.
Essays in Neurochemistry and Neuropharmacology
|January 1, 1977
Summary
Huntington's chorea involves brain cell loss, particularly in the caudate nucleus and putamen. Decreased GABA neurotransmitter levels may explain uncontrolled movements, suggesting GABA-mimetic drugs as a potential treatment.
Area of Science:
- Neuroscience
- Genetics
- Biochemistry
Background:
- Huntington's chorea is a dominant inherited neurological disorder causing involuntary movements.
- Pathological examination shows atrophy in the caudate nucleus and putamen, with widespread cell loss, sparing the hippocampus.
- Previous biochemical defect studies in chorea patients have yielded limited results.
Purpose of the Study:
- To investigate the biochemical underpinnings of Huntington's chorea.
- To explore neurotransmitter system abnormalities, specifically dopamine and GABA, in affected brains.
- To identify potential therapeutic targets for Huntington's chorea.
Main Methods:
- Analysis of post-mortem brain tissue from Huntington's chorea patients.
- Measurement of neurotransmitter levels (dopamine, GABA) and enzyme activities (GAD, choline acetyltransferase).
- Examination of cerebrospinal fluid (CSF) for dopamine metabolites (HVA).
Main Results:
- Dopamine levels were normal or decreased; tyrosine hydroxylase activity was normal.
- Significant reductions in GABA and its synthesizing enzyme GAD were observed in post-mortem choreic brains.
- Decreased choline acetyltransferase activity was noted in some choreic brains.
- GABA receptors were found to be intact.
Conclusions:
- Reduced GABAergic neurotransmission offers a biochemical explanation for the motor symptoms of Huntington's chorea.
- Intact GABA receptors suggest potential efficacy of GABA-mimetic drugs.
- Further research is needed to identify the primary defect for early detection and potential eradication of the disorder.