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Studies on the effect of 4-methylpyrazole on methanol poisoning using the monkey as an animal model: with particular
Abstract:
Young cynomolgus monkeys (Macaca fascicularis) were chosen as a model to investigate the ocular toxicity in animals poisoned with methanol and treated with 4-methylpyrazole (4-MP). The metabolism of methanol in the monkey was investigated after administration of 4-MP. Plasma levels of methanol, formic acid, 4-MP and 4-hydroxy-MP (4-OH-MP) were determined. After intramuscular injection, 4-MP was rapidly absorbed and depressed the elimination rate of methanol as well as the accumulation of formate in the blood. The results show the same great individual variations in monkeys as in humans regarding the susceptibility to methanol poisoning. Administration of a single dose of 5 g/kg induces a serious intoxication in most monkeys, causing death to some of them. Two monkeys receiving a single dose of 6 g/kg of methanol developed a serious initial inebriation and were treated with 4-MP. These monkeys survived and showed no signs of toxicity on ocular examinations which included ophtalmoscopy and electroretinogram (ERG) recordings.
Insights
Young monkeys treated with 4-methylpyrazole (4-MP) survived methanol poisoning. 4-MP reduced methanol elimination and formate accumulation, preventing ocular toxicity in this animal model.
Area of Science:
- Toxicology
- Pharmacology
- Primate Models
Background:
- Methanol poisoning can cause severe toxicity, including ocular damage.
- 4-methylpyrazole (4-MP) is an alcohol dehydrogenase inhibitor used to treat methanol poisoning.
- Cynomolgus monkeys serve as a relevant model for studying methanol toxicity due to physiological similarities with humans.
Purpose of the Study:
- To investigate the efficacy of 4-methylpyrazole (4-MP) in preventing methanol-induced ocular toxicity in cynomolgus monkeys.
- To examine the metabolic effects of 4-MP on methanol poisoning in a primate model.
- To assess individual variations in susceptibility to methanol toxicity.
Main Methods:
- Administration of methanol (5-6 g/kg) to young cynomolgus monkeys.
- Treatment with 4-methylpyrazole (4-MP) in methanol-intoxicated monkeys.
- Monitoring of plasma levels of methanol, formic acid, 4-MP, and 4-hydroxy-MP (4-OH-MP).
- Ocular examinations including ophthalmoscopy and electroretinogram (ERG) recordings.
Main Results:
- 4-MP was rapidly absorbed and significantly slowed methanol elimination and formate accumulation in plasma.
- Monkeys receiving a high dose of methanol (6 g/kg) and treated with 4-MP survived without observable ocular toxicity.
- Significant individual variations in susceptibility to methanol poisoning were observed, mirroring human responses.
Conclusions:
- 4-methylpyrazole (4-MP) effectively mitigates methanol toxicity and prevents ocular damage in cynomolgus monkeys.
- The primate model demonstrates the protective role of 4-MP in methanol poisoning by altering methanol metabolism.
- Individual variability in response highlights the complexity of methanol poisoning management.