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MicroRNA-98 Suppress Warburg Effect by Targeting HK2 in Colon Cancer Cells

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Abstract

Background

Warburg effect is a hallmark of cancer cells. Accumulating evidence suggests that microRNAs (miRs) could regulate such metabolic reprograming. Aberrant expression of miR-98 has been observed in many types of cancers. However, its functions and significance in colon cancer remain largely elusive.

Aims

To investigate miR-98 expression and the biological functions in colon cancer progression.

Methods

miR-98 expression levels were determined by quantitative RT-PCR in 215 cases of colon cancer samples. miR-98 mimic or inhibitor was used to test the biological functions in SW480 and HCT116 cells, followed by cell proliferation assay, lactate production, glucose uptake, and cellular ATP levels assay and extracellular acidification rates measurement. Western blot and luciferase assay were used to identify the target of miR-98.

Results

miR-98 was significantly down-regulated in colon cancer tissues compared to adjacent colon tissues and acted as a suppressor for Warburg effect in cancer cells. miR-98 inhibited glycolysis by directly targeting hexokinase 2, or HK2, illustrating a novel pathway to mediate Warburg effect of cancer cells. In vitro experiments further indicated that HK2 was involved in miR-98-mediated suppression of glucose uptake, lactate production, and cell proliferation. In addition, we detected HK2 expression in colon cancer tissues and found that the expressions of miR-98 and HK2 were negatively correlated.

Conclusion

miR-98 acts as tumor suppressor gene and inhibits Warburg effect in colon cancer cells, which provided potential targets for clinical treatments.

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Authors and Affiliations

  1. Department of Oncology, Binhu Traditional Chinese Medicine Hospital, 390#, Xinchengdao Road, Binhu District, Wuxi, 214121, Jiangsu Province, People’s Republic of China

    Weimin Zhu, Yijiao Huang, Qi Pan, Pei Xiang, Nanlan Xie & Hao Yu

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  1. Weimin Zhu
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  2. Yijiao Huang
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  3. Qi Pan
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  4. Pei Xiang
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  5. Nanlan Xie
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  6. Hao Yu
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Correspondence to Hao Yu.

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Zhu, W., Huang, Y., Pan, Q. et al. MicroRNA-98 Suppress Warburg Effect by Targeting HK2 in Colon Cancer Cells. Dig Dis Sci 62, 660–668 (2017). https://doi.org/10.1007/s10620-016-4418-5

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  • DOI: https://doi.org/10.1007/s10620-016-4418-5

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