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Glycolysis gatekeeper PDK1 reprograms breast cancer stem cells under hypoxia.

Abstract：

:Glycolysis is critical for cancer stem cell reprogramming; however, the underlying regulatory mechanisms remain elusive. Here, we show that pyruvate dehydrogenase kinase 1 (PDK1) is enriched in breast cancer stem cells (BCSCs), whereas depletion of PDK1 remarkably diminishes ALDH+ subpopulations, decreases stemness-related transcriptional factor expression, and inhibits sphere-formation ability and tumor growth. Conversely, high levels of PDK1 enhance BCSC properties and are correlated with poor overall survival. In mouse xenograft tumor, PDK1 is accumulated in hypoxic regions and activates glycolysis to promote stem-like traits. Moreover, through screening hypoxia-related long non-coding RNAs (lncRNAs) in PDK1-positive tissue, we find that lncRNA H19 is responsible for glycolysis and BCSC maintenance. Furthermore, H19 knockdown decreases PDK1 expression in hypoxia, and ablation of PDK1 counteracts H19-mediated glycolysis and self-renewal ability in vitro and in vivo. Accordingly, H19 and PDK1 expression exhibits strong correlations in primary breast carcinomas. H19 acting as a competitive endogenous RNA sequesters miRNA let-7 to release Hypoxia-inducible factor 1α, leading to an increase in PDK1 expression. Lastly, aspirin markedly attenuates glycolysis and cancer stem-like characteristics by suppressing both H19 and PDK1. Thus, these novel findings demonstrate that the glycolysis gatekeeper PDK1 has a critical role in BCSC reprogramming and provides a potential therapeutic strategy for breast malignancy.

journal_name

Oncogene

journal_title

Oncogene

authors

Peng F,Wang JH,Fan WJ,Meng YT,Li MM,Li TT,Cui B,Wang HF,Zhao Y,An F,Guo T,Liu XF,Zhang L,Lv L,Lv DK,Xu LZ,Xie JJ,Lin WX,Lam EW,Xu J,Liu Q

doi

10.1038/onc.2017.368

subject

Has Abstract

pub_date

2018-02-22 00:00:00

pages

1062-1074

issue

8

eissn

0950-9232

issn

1476-5594

pii

onc2017368

journal_volume

37

pub_type

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