Down-regulation of miR-200b-3p by low p73 contributes to the androgen-independence of prostate cancer cells

Authors

  • Minyi He,

    1. Department of Organ Transplantation, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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  • Yun Liu,

    1. Key Laboratory of Transctriptome and Proteome of Human Diseases Supported by the Ministry of Education of China, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
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  • Xinjun Deng,

    1. Department of Organ Transplantation, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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  • Songtao Qi,

    1. Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
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  • Xuegang Sun,

    1. School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, China
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  • Gang Liu,

    1. Department of Organ Transplantation, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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  • Yongguang Liu,

    1. Department of Organ Transplantation, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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  • Dr. Yawei Liu,

    Corresponding author
    1. Key Laboratory of Transctriptome and Proteome of Human Diseases Supported by the Ministry of Education of China, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
    2. Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
    • Department of Neurosurgery, Nangfang Hospital; Key Laboratory of Transctriptome and Proteome of Human Diseases Supported by the Ministry of Education of China, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China.
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  • Prof. Ming Zhao

    Corresponding author
    1. Department of Organ Transplantation, Zhujiang Hospital, Southern Medical University, Guangzhou, China
    • Department of Organ Transplantation, Zhujiang Hospital, Southern Medical University, Guangzhou 510515, China.
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  • Minyi He and Yun Liu contributed equally.

Abstract

BACKGROUND

An increasing body of evidence indicates that microRNAs play critical roles in androgen-independent prostate cancer (AIPC) growth. However, the regulation of the expression of microRNAs in AIPC is not very clear. In this study, we investigated the role that the interaction between miR-200b-3p and p73 plays in the proliferation of AIPC.

METHODS

We compared several relevant microRNAs and cancer related genes between the androgen-dependent prostate cancer (ADPC) cell line and the AIPC cell line using quantitative real-time PCR (Q-PCR) and Western blot. Then we examined the effect of p73 and miR-200b-3p on the proliferation of AIPC and ADPC using CCK-8. Furthermore we investigated the regulation of miR-200b-3p by p73.

RESULTS

p73 and miR-200b-3p were both downregulated in the PC3 cell line (AIPC). Down-regulation of both p73 and miR-200b-3p increased the proliferation of ADPC cells cultured with androgen-free medium, while up-regulation of p73 and miR-200b-3p decreased the proliferation of AIPC cells. When p73 was over-expressed in the AIPC cell subline, miR-200b-3p expression increased accordingly, while p73 was inhibited in ADPC cells cultured with androgen-free medium and miR-200b-3p expression decreased significantly.

CONCLUSION

miR-200b-3p is down-regulated by low expression of p73 in AIPC cells, and this interaction contributes to the proliferation of AIPC. Prostate 73: 1048–1056, 2013. © 2013 Wiley Periodicals, Inc.

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