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S-phase kinase-associated protein 2 knockdown blocks colorectal cancer growth via regulation of both p27 and p16 expression

Cancer Gene Therapy volume 20, pages 690–694 (2013)Cite this article

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Abstract

The objective of this study was to determine the role and mechanism of S-phase kinase-associated protein 2 (Skp2) in colorectal cancer cell proliferation and survival both in vitro and in vivo. Adenoviral vector expressing Skp2 short hairpin RNA was transduced into SW480 cells. The effects of Skp2 on cell cycle and survival were assessed by Flow Cytometry. Cell proliferation was analyzed by MTT assay. The expression of cell cycle regulators p16 and p27 were measured by western blot. In vivo, human colorectal cancer was produced by xenograft of cancer cells in nude mouse. Tumor growth inhibitory rate was calculated to generate growth curve. Tumor growth was monitored by examining proliferating cell nuclear antigen expression, whereas tumor cell apoptosis was detected by TdT-mediated dUTP nick-end labeling (TUNEL) staining. Knockdown of Skp2 blocked SW480 tumor cell growth and induced cell apoptosis. Skp2 appeared to be very important for the progression of cell cycle at G1/S phase. In vivo, blockade of Skp2 expression inhibited tumor growth and induced tumor apoptosis. Mechanistically, Skp2 regulated the expression of both p27 and p16 both in vitro and in vivo. The conclusion that we derive from this study is that Skp2 regulates colorectal cancer cell growth by inhibiting the expression of cell cycle regulator p27 and p16.

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Acknowledgements

This study was supported by grants from Hubei Education Department Science Foundation (200524001), Hubei Science and Technology Department Natural Science Foundation (2011CDB01802).

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Authors and Affiliations

  1. Department of Gastroenterology, Renmin Hospital, Hubei University of Medicine, Shiyan, China

    S-Y Xu, F Wang, G Wei & B Wang

  2. Hubei University of Medicine, Shiyan, China

    B Wang

  3. Key Laboratory of Human Embryonic Stem Cell Research of Hubei Province, Hubei University of Medicine, Shiyan, China

    J-Y Yang, Y-Z Huang, L Zhang, F Zheng, L-Y Guo, J-N Wang & J-M Tang

  4. Department of Cardiology and Institute of Clinical Medicine, Renmin Hospital, Hubei University of Medicine, Shiyan, China

    Y-Z Huang

  5. Department of Physiology, Hubei University of Medicine, Shiyan, China

    J-M Tang

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  1. S-Y Xu
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Correspondence to S-Y Xu.

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Xu, SY., Wang, F., Wei, G. et al. S-phase kinase-associated protein 2 knockdown blocks colorectal cancer growth via regulation of both p27 and p16 expression. Cancer Gene Ther 20, 690–694 (2013). https://doi.org/10.1038/cgt.2013.70

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  • DOI: https://doi.org/10.1038/cgt.2013.70

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