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The activities of 3-phosphoglycerate dehydrogenase and serine hydroxymethyltransferase increased markedly during the transition of hepatoma cells from a resting non-proliferating culture into the proliferating growth phase. Activities declined as cells reached confluency and entered the plateau growth phase. This pattern was paralleled by changes in [14C]serine incorporation into nucleic acids. The experiments support the hypothesis that the biosynthesis of serine is metabolically coupled to its utilization for nucleotide precursor formation in cancer cells.

The modulation of serine metabolism in hepatoma 3924A during different phases of cellular proliferation in culture