Metabolic reprogramming of metastatic breast cancer and melanoma by Let-7a microRNA

  • Serguienko A
  • Grad I
  • Wennerstrøm A
 et al. 
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Let-7 microRNAs (miRNAs) are highly conserved well-established promoters of terminal differentiation that are expressed in healthy adult tissues and frequently repressed in cancer cells. The tumor suppressive role of let-7 in a variety of cancers in vitro and in vivo has been widely documented and prompted these miRNAs to be candidate genes for miRNA replacement therapy. In this study we described a new role of let-7a in reprogramming cancer metabolism, recently identified as a new hallmark of cancer. We show that let-7a down-regulates key anabolic enzymes and increases both oxidative phosphorylation and glycolysis in triple-negative breast cancer and metastatic melanoma cell lines. Strikingly, the accelerated glycolysis coexists with drastically reduced cancer features. Moreover, let-7a causes mitochondrial ROS production concomitant with the up-regulation of oxidative stress responsive genes. To exploit these increased ROS levels for therapeutic purposes, we combined let-7a transfection with the chemotherapeutic drug doxorubicin. In both cancer types let-7a increased cell sensitivity to doxorubicin. Pre-treatment with N-acetyl cysteine (NAC) totally abolished this effect, indicating that the increased doxorubicin sensitivity of let-7a cells depends on the redox pathway. We thus have demonstrated that let-7a plays a prominent role in regulating energy metabolism in cancer cells, further expanding its therapeutic potential.

Author-supplied keywords

  • Glycolysis
  • HMOX1
  • Mitochondria
  • ROS

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  • A. Serguienko

  • I. Grad

  • A.B. Wennerstrøm

  • L.A. Meza-Zepeda

  • B. Thiede

  • E.W. Stratford

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