Abstract
The tritium release assay for the demonstration of thymidylate synthetase activity has been applied to the measurement of enzyme activity in the bone marrow of four patients with pernicious anemia and nine normal subjects. On the average, an approximately ninefold increase in enzyme activity was observed in patients with pernicious anemia. In the absence of 5, 10-methylene-tetrahydrofolate, enzyme activity was reduced in both normal and in pernicious anemia cells. Addition of 5, 10-methylene-tetrahydrofolate to the assay medium resulted in a far greater activation of thymidylate synthetase activity in megaloblastic bone marrow cells than in the cells of control subjects.
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