Augmented Pentose Phosphate Pathway Plays Critical Roles in Colorectal Carcinomas

作者：Shibuya Norisuke; Inoue Ken ichi; Tanaka Genki; Akimoto Kazumi; Kubota Keiichi^*

来源：Oncology, 2015, 88(5): 309-319.

DOI：10.1159/000369905

• Pentose phosphate pathway
• Mammalian target of rapamycin
• Aerobic glycolysis
• Avemar
• Reactive oxygen species
• Colorectal carcinoma

Glycolysis and the pentose phosphate pathway (PPP) are preferentially activated in cancer cells. Accumulating evidence indicated the significance of the altered glucose metabolism in cancer, but the implication for oncotherapy remains unclear. Here we report that the synthesis of glycolytic and PPP enzymes is almost ubiquitously augmented in colorectal carcinoma (CRC) specimens. The mammalian target of rapamycin (mTOR) inhibitor INK128 (300 nM) and phytochemical Avemar (1 mg/ml) inhibited the synthesis of PPP enzymes in CRC cell lines. INK128 (150-600 nM) and resveratrol (75-300 mu M) inhibited aerobic glycolysis in the cell lines. INK128 (300 nM) and Avemar (1 mg/ml) decreased the NADPH/NADP(+) ratio as well as the GSH/GSSG ratio in the cell lines. Finally, per os administration of INK128 (0.8 mg/kg) or Avemar (1 g/kg) suppressed tumor growth and delayed tumor formation by transplantable CRC specimens derived from patients. Taken together, pharmacological inhibition of the mTOR-PPP axis is a promising therapeutic strategy against CRCs.

• 出版日期2015