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Formate metabolism in young swine
A B Makar1, T R Tephly, G Sahin
1University of Osteopathic Medicine and Health Sciences, Des Moines, Iowa 50312.
Toxicology and Applied Pharmacology
|September 1, 1990
Summary
Pigs exhibit extremely low folate levels and impaired formate metabolism, suggesting they may be a suitable animal model for studying methanol toxicity. This contrasts with rats and monkeys, highlighting species-specific differences in folate metabolism.
Area of Science:
- Toxicology
- Biochemistry
- Animal Models
Background:
- Methanol metabolism produces formate, which causes toxicity in monkeys due to folate deficiency and impaired formate disposal.
- Rats efficiently metabolize formate due to a robust folate system, thus not exhibiting methanol toxicity.
- Understanding species-specific differences in folate metabolism is crucial for studying methanol toxicity.
Purpose of the Study:
- To evaluate hepatic folate content and formate handling capacity in pigs.
- To determine the suitability of pigs as an animal model for formate metabolism and methanol toxicity research.
Main Methods:
- Assessed hepatic folate levels in pigs.
- Measured the activity of 10-formyl tetrahydrofolate dehydrogenase, a key folate pathway enzyme.
- Evaluated the pigs' ability to metabolize an administered formate load.
Main Results:
- Pigs demonstrated extremely low hepatic folate levels compared to other species studied.
- Pigs exhibited very low levels of 10-formyl tetrahydrofolate dehydrogenase activity.
- The pigs' capacity for formate disposal was severely limited and slower than in rats or monkeys.
Conclusions:
- Pigs possess a deficient folate system and limited formate metabolism, similar to folate-deficient monkeys.
- The pig's metabolic profile suggests it could serve as a valuable animal model for investigating formate metabolism.
- This study indicates the potential of the pig model for advancing research into methanol toxicity mechanisms.