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A decrease in serum folate levels of rats receiving diphenylhydantoin was partly due to a reflexion of a decreased level of N5-methyltetrahydrofolate in the liver of these rats. The decreased levels of Nb-methyltetrahydrofolate in the liver was resulted from an elevation of the N5-methyltetrahydrofolate-homocysteine transmethylase activity. The elevation of the enzyme activity was resulted from (a) an increased production of the N5-methyltetrahydrofolate-homocysteine transmethylase apoenzyme by induction following diphenylhydantoin administration, and (b) a probably increased supply with vitamin B12 to the liver which was mediated by an increased level of the serum transcobalamin II due to diphenylhydantoin administration.

Mechanism of Decrease in Serum Folate Levels of Rats Receiving Diphenylhydantion