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The role of 5′ untranslated region in translational suppression of OKL38 mRNA in hepatocellular carcinoma

Oncogene volume 26, pages 1155–1165 (2007)Cite this article

Abstract

Hepatocellular carcinoma (HCC) is the sixth most common cancer worldwide. OKL38 is a pregnancy-induced growth inhibitory gene and its expression is lost in various breast cancer cell lines and kidney tumor. To determine the role of OKL38 expression in HCC, we investigated its expression in various HCC samples and liver cancer cell lines. Western blot analysis revealed that OKL38 protein was absent or reduced in 64.2% (18 of 28) of the HCCs examined and four liver cancer cell lines. Immunohistochemistry study demonstrated that OKL38 protein was undetectable in 41.3% (38 of 92) of HCC, whereas 39.1% (36 of 92) of HCC showed low expression of the protein. Lost or reduced expression level of OKL38 protein was significantly correlated to high tumor stages in HCC (P=0.0042). Overexpression of the OKL38 caused cell death in Chang liver cells. 5′ Untranslated region (5′UTR) deletion studies demonstrated that OKL38 was downregulated via translation suppression associated with the 5′UTR of its mRNA. Taken together, the 5′UTRs of OKL38 might play an important role in downregulation of its protein and the absence of OKL38 could lead to the development or progression of HCC.

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Acknowledgements

This work was supported by grants from A*STAR-BMRC (LS/00/019) to Huynh Hung.

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Authors and Affiliations

  1. Division of Cellular and Molecular Research, Laboratory of Molecular Endocrinology, National Cancer Centre of Singapore, Singapore, Singapore

    C K Ong, C Leong & H Huynh

  2. Department of Pathology, Singapore General Hospital, Singapore, Singapore

    P H Tan

  3. Binh Dan Hospital, Ho Chi Minh City, Vietnam

    T Van

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  1. C K Ong
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  2. C Leong
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  3. P H Tan
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  4. T Van
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  5. H Huynh
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Correspondence to H Huynh.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).

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Ong, C., Leong, C., Tan, P. et al. The role of 5′ untranslated region in translational suppression of OKL38 mRNA in hepatocellular carcinoma. Oncogene 26, 1155–1165 (2007). https://doi.org/10.1038/sj.onc.1209896

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