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Brain acetylcholinesterase after parathion poisoning: a comparative quantitative histochemical analysis post-mortem
Y Finkelstein1, M Wolff, A Biegon
1Israeli Poison Control Center, Rambam Medical Center, Haifa, Israel.
Toxicology
|April 1, 1988
Summary
Parathion poisoning selectively inhibits acetylcholinesterase (AChE) in specific human brain regions. The cerebellum, thalamus, and cortex showed the most significant AChE activity decreases.
Area of Science:
- Neurotoxicology
- Histochemistry
- Organophosphate Pesticides
Background:
- Organophosphate pesticides, like parathion, are known neurotoxins.
- Acetylcholinesterase (AChE) is a critical enzyme in neurotransmission.
- Understanding regional brain vulnerability to parathion is crucial for diagnosing and treating poisoning.
Observation:
- A comparative quantitative histochemical study was performed on human brain tissue.
- Brains from two lethal parathion intoxication victims were analyzed alongside two age- and sex-matched controls.
- AChE activity was measured in discrete brain regions using 40-micron cryostat sections.
Findings:
- Parathion-induced AChE inhibition demonstrates significant regional selectivity within the human brain.
- The most pronounced AChE activity decreases were observed in the cerebellum, thalamic nuclei, and cerebral cortex.
- Substantia nigra and basal ganglia showed moderate AChE inhibition (10-30%), while white matter regions were unaffected.
Implications:
- The regional distribution of AChE inhibition provides insights into the neurotoxic effects of parathion.
- This detailed regional data may help explain the clinical symptoms observed in organophosphate poisoning.
- Findings contribute to understanding the neuropathology of pesticide-induced neurotoxicity.