Original Article | Published:

Antitumor Pharmacology

Involvement of hepatitis B X-interacting protein (HBXIP) in proliferation regulation of cells

Acta Pharmacologica Sinica volume 28, pages 431438 (2007) | Download Citation

Project supported by grants from the National Natural Science Foundation of China (No 30670959).

Abstract

Aim:

To investigat the effect of Hepatitis B X-interacting protein (HBXIP) on cell proliferation.

Methods:

A rabbit antibody against HBXIP was generated. The RNA interference (RNAi) fragment of the HBXIP gene was constructed in the pSilencer-3.0-H1 vector termed pSilencer-hbxip. Plasmids of the pcDNA3-hbxip encoding HBXIP gene and pSilencer-hbxip were transfected into human breast carcinoma MCF-7 cells, hepatoma H7402 cells, and the normal human hepatic cell line L-O2, respectively. 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay and 5-bromo-2-deoxyuridine incorporation assay were applied to detect cell proliferation. MCF-7 cells and L-O2 cells in the cell cycle were examined by flow cytometry. The proteins involved in cell proliferation and cell cycle were investigated by Western blot.

Results:

Overexpression of HBXIP resulted in the promotion of proliferation of MCF-7, H7402, and L-O2 cells. Flow cytometry showed that the overexpression of HBXIP promoted the cell proliferation of MCF-7 and L-O2 cells, and led to an increased cell proliferative index in MCF-7 cells (from 46.25% to 58.28%) and L-O2 cells (from 29.62% to 35.54%). Western blot showed that expression levels of c-Myc, Bcl-2, and proliferating cell nuclear antigen were upregulated in MCF-7, H7402, or L-O2 cells, whereas that of p27 was downregulated. However, the RNAi of HBXIP brought opposite results.

Conclusion:

One of the functions of HBXIP is its involvement in cell proliferation.

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Affiliations

  1. Department of Biochemistry, Tianjin Key Laboratory of Microbial Functional Genomics, Institute for Molecular Biology, College of Life Sciences, Nankai University, Tianjin 300071, China

    • Feng-ze Wang
    • , Lian-ying Wu
    • , Ling Qiao
    •  & Li-hong Ye
  2. Department of Cancer Research, Tianjin Key Laboratory of Microbial Functional Genomics, Institute for Molecular Biology, College of Life Sciences, Nankai University, Tianjin 300071, China

    • Li Sha
    • , Wei-ying Zhang
    • , Nan Li
    •  & Xiao-dong Zhang

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DOI

https://doi.org/10.1111/j.1745-7254.2007.00531.x

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