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Article

Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma

  • Authors:
    • Chao Yu
    • Sheng‑Li Yang
    • Xiefan Fang
    • Jian‑Xin Jiang
    • Cheng‑Yi Sun
    • Tao Huang
  • View Affiliations / Copyright

    Affiliations: Department of Hepatobiliary Surgery, Affiliated Hospital of Guiyang Medical College, Guiyang, Guizhou 550001, P.R. China, Department of General Surgery, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430077, P.R. China, Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL 32610, USA, Department of Pediatrics, Tianyou Hospital, Wuhan University of Science and Technology, Wuhan, Hubei 430064, P.R. China
  • Pages: 4002-4008
    |
    Published online on: January 14, 2015
       https://doi.org/10.3892/mmr.2015.3199
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Abstract

Disturbance in the expression of circadian rhythm genes is a common feature in certain types of cancer, however the mechanisms mediating this disturbance remain to be elucidated. The present study aimed to investigate the effect of hypoxia on the expression of circadian rhythm genes in liver cancer cells and to identify the mechanisms underlying this effect in hepatocellular carcinoma (HCC). The HCC cell line, PLC/PRF/5. was treated with either a vehicle control or CoCl2 at 50, 100 or 200 µΜ for 24 h. Following treatment, the protein expression levels of hypoxia‑inducible factor (HIF)‑1α and HIF‑2α were detected by western blotting and the mRNA expression levels of circadian rhythm genes, including circadian locomotor output cycles kaput (Clock), brain and muscle Arnt‑like 1 (Bmal1), period (Per)1, Per2, Per3, cryptochrome (Cry)1, Cry2 and casein kinase Iε (CKIε), were detected by reverse transcription quantitative polymerase chain reaction (RT‑qPCR). Expression plasmids containing HIF‑1α or HIF‑2α were transfected into the PLC/PRF/5 cells using liposomes and RT‑qPCR was used to determine the effects of the transfections on the expression levels of circadian rhythm genes. Following treatment with CoCl2, the protein expression levels of HIF‑1α and HIF‑2α were upregulated in a CoCl2 concentration‑dependent manner. The mRNA expression levels of Clock, Bmal1 and Cry2 were increased, and the mRNA expression levels of Per1, Per2, Per3, Cry1 and CKIε were decreased following CoCl2 treatment (P<0.05). In the PLC/PRF/5 cells transfected with the plasmid containing HIF‑1α, the mRNA expression levels of Clock, Bmal1 and Cry2 were increased, and the mRNA expression levels of Per1, Per2, Per3, Cry1 and CKIε were decreased. In the PLC/PRF/5 cells transfected with the plasmid containing HIF‑2α, the mRNA expression levels of Clock, Bmal1, Per1, Cry1, Cry2 and CKIε were upregulated, and the mRNA expression levels of Per2 and Per3 were downregulated (P<0.05). A hypoxic microenvironment may contribute to the disturbance in the expression of circadian genes in HCC. HIF‑1α and HIF‑2α are involved in this process and have redundant, but not identical effects.
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Copy and paste a formatted citation
Spandidos Publications style
Yu C, Yang SL, Fang X, Jiang JX, Sun CY and Huang T: Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma. Mol Med Rep 11: 4002-4008, 2015.
APA
Yu, C., Yang, S., Fang, X., Jiang, J., Sun, C., & Huang, T. (2015). Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma. Molecular Medicine Reports, 11, 4002-4008. https://doi.org/10.3892/mmr.2015.3199
MLA
Yu, C., Yang, S., Fang, X., Jiang, J., Sun, C., Huang, T."Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma". Molecular Medicine Reports 11.5 (2015): 4002-4008.
Chicago
Yu, C., Yang, S., Fang, X., Jiang, J., Sun, C., Huang, T."Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma". Molecular Medicine Reports 11, no. 5 (2015): 4002-4008. https://doi.org/10.3892/mmr.2015.3199
Copy and paste a formatted citation
x
Spandidos Publications style
Yu C, Yang SL, Fang X, Jiang JX, Sun CY and Huang T: Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma. Mol Med Rep 11: 4002-4008, 2015.
APA
Yu, C., Yang, S., Fang, X., Jiang, J., Sun, C., & Huang, T. (2015). Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma. Molecular Medicine Reports, 11, 4002-4008. https://doi.org/10.3892/mmr.2015.3199
MLA
Yu, C., Yang, S., Fang, X., Jiang, J., Sun, C., Huang, T."Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma". Molecular Medicine Reports 11.5 (2015): 4002-4008.
Chicago
Yu, C., Yang, S., Fang, X., Jiang, J., Sun, C., Huang, T."Hypoxia disrupts the expression levels of circadian rhythm genes in hepatocellular carcinoma". Molecular Medicine Reports 11, no. 5 (2015): 4002-4008. https://doi.org/10.3892/mmr.2015.3199
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