SAICAR stimulates pyruvate kinase isoform M2 and promotes cancer cell survival in glucose-limited conditions.
SAICAR stimulates pyruvate kinase isoform M2 and promotes cancer cell survival in glucose-limited conditions.
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SAICAR刺激丙酮酸激酶同工型M2,并在葡萄糖有限的条件下促进癌细胞的存活。
DOI:
10.1126/science.1224409
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发表时间:
2012-11-23
期刊:
影响因子:
--
通讯作者:
Lee YS
中科院分区:
文献类型:
--
作者:
Keller KE;Tan IS;Lee YS
Pyruvate kinase isoform M2 (PKM2) plays an important role in the growth and metabolic reprogramming of cancer cells in stress conditions. Here, we report that SAICAR (succinylaminoimidazolecarboxamide ribose-5′-phosphate, an intermediate of the de novo purine nucleotide synthesis pathway) specifically stimulates PKM2. Upon glucose starvation, cellular SAICAR concentration increases in an oscillatory manner and stimulates PKM2 activity in cancer cells. Changes in SAICAR levels in cancer cells alter cellular energy level, glucose uptake, and lactate production. The SAICAR-PKM2 interaction also promotes cancer cell survival in glucose-limited conditions. SAICAR accumulation is not observed in normal adult epithelial cells or lung fibroblasts regardless of glucose conditions. This allosteric regulation may explain how cancer cells coordinate different metabolic pathways to optimize their growth in the nutrient-limited conditions commonly observed in the tumor microenvironment.
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