Decreased purine synthesis during amino acid starvation of human lymphoblasts.

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Decreased Purine Synthesis during Amino Acid Starvation

Normal human lymphoblasts starved for each of several essential, but not nonessential, amino acids had decreased DNA and RNA synthesis but no change in free intracellular purine nucleotides. The rates of purine nucleotide synthesis via the de novo and salvage pathways were measured by incorporating [14C]formate and [“C]hypoxanthine labels, respectively, into lymphoblasts starved for an amino ac...

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Plasma concentration, splanchnic and renal exchange, and urinary excretion of 20 amino acids were studied in obese subjects during prolonged (5-6 wk) starvation. Splanchnic amino acid uptake was also investigated in postabsorptive and briefly (36-48 hr) fasted subjects.A transient increase in plasma valine, leucine, isoleucine, methionine, and alpha-aminobutyrate was noted during the 1st wk of ...

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The megaloblastic anemia of cobalamin deficiency appears secondary to decreased methionine synthetase activity. Decreased activity of this enzyme should cause 5-methyltetrahydrofolate to accumulate intracellularly, and consequently, decrease purine and DNA synthesis; this is the basis of the "methylfolate trap" hypothesis of cobalamin deficiency. However, only some of the clinical and biochemic...

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ژورنال

عنوان ژورنال: Journal of Biological Chemistry

سال: 1982

ISSN: 0021-9258

DOI: 10.1016/s0021-9258(18)34712-4