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Toxic models of upper motor neuron disease
1Department of Neurology, Humboldt University, Berlin, Germany.
Journal of the Neurological Sciences
|August 1, 1996
Summary
Neurotoxic plant products cause spastic paraparesis. Lathyrism from Lathyrus sativus and konzo from Manihot esculenta share similar symptoms, but their exact mechanisms and targeting of Betz cells remain unclear.
Area of Science:
- Neuroscience
- Toxicology
- Neurology
Background:
- Neurotoxic disorders like lathyrism and konzo cause spastic paraparesis.
- These conditions result from consuming neurotoxic plant products, Lathyrus sativus and Manihot esculenta.
- Both disorders predominantly affect Betz cells, leading to similar clinical presentations.
Purpose of the Study:
- To investigate the mechanisms behind lathyrism and konzo.
- To understand why these neurotoxic disorders target Betz cells.
- To explore the latency and similar clinical outcomes of these distinct conditions.
Main Methods:
- Review of existing literature on lathyrism and konzo.
- Analysis of causative agents: beta-N-oxalylamino-1-alanine (BOAA) for lathyrism and linamarin for konzo.
- Examination of macaque models fed Lathyrus sativus or BOAA.
Main Results:
- Macaques fed Lathyrus sativus or BOAA developed central motor deficits.
- These deficits involved corticospinal tract damage, mimicking human neurotoxic disorders.
- Dosages required to induce lathyrism in primates were significantly higher than human exposure levels.
Conclusions:
- Lathyrism and konzo offer insights into self-limiting neurotoxic disorders.
- Unexplained factors include toxin targeting of Betz cells, disease latency, and shared clinical features.
- Further research is needed to elucidate the precise mechanisms of these neurotoxic effects.