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Isovaleric and -methylbutyric acidemias induced by hypoglycin A: mechanism of Jamaican vomiting sickness
Abstract:
Hypoglycin A, the causative agent of the Jamaican vomiting sickness, produced a marked increase in concentration of isovaleric acid in the plasma of rats, when administered in a single dose. alpha-Methylbutyric acid, a position isomer, also accumulated. The use of hypoglycin A reproduced some features of human isovaleric acidemia. Accumulation of these branched pentanoic acids may be another factor contributing to the pathogenesis of the Jamaican vomiting sickness.
Insights
Hypoglycin A, a toxin causing Jamaican vomiting sickness, significantly increased isovaleric acid levels in rats. This study suggests these accumulated acids contribute to the disease's pathology.
Area of Science:
- Biochemistry
- Toxicology
- Metabolic Disorders
Background:
- Jamaican vomiting sickness is a severe illness linked to Hypoglycin A consumption.
- The exact mechanisms of Hypoglycin A toxicity are not fully understood.
- Isovaleric acidemia is a human metabolic disorder characterized by isovaleric acid accumulation.
Purpose of the Study:
- To investigate the metabolic effects of Hypoglycin A administration in a rat model.
- To determine if Hypoglycin A causes the accumulation of specific branched-chain fatty acids.
- To explore the potential role of these acids in the pathogenesis of Jamaican vomiting sickness.
Main Methods:
- Administration of a single dose of Hypoglycin A to rats.
- Measurement of plasma concentrations of isovaleric acid and related compounds.
- Comparison of observed effects with features of human isovaleric acidemia.
Main Results:
- Hypoglycin A administration led to a significant increase in plasma isovaleric acid concentrations in rats.
- A position isomer, alpha-methylbutyric acid, also accumulated in the plasma.
- The observed acid accumulation mimicked aspects of human isovaleric acidemia.
Conclusions:
- Hypoglycin A induces the accumulation of branched pentanoic acids, specifically isovaleric acid and alpha-methylbutyric acid.
- These accumulated acids may play a significant role in the development of Jamaican vomiting sickness.
- The findings provide insights into the biochemical basis of this toxic illness.