Abstract
The effect of the triazine antifolate NSC 127755 on serine hydroxymethyltransferase activity in mouse myeloma X63 cells in culture was determined. The enzyme was inhibited, apparently irreversibly, with IC 50 ≈ 5 × 10 −8 M. A similar concentration-dependency for inhibition of [6- 3H]deoxyuridine incorporation into DNA was observed in these cells in culture. Long-term culture of myeloma cells with NSC 127755 resulted in a progressive decrease in the number of viable cells. The study emphasises the significance of serine hydroxymethyltransferase as a target for anticancer chermotherapy.
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