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Restoration of DLC-1 gene expression induces apoptosis and inhibits both cell growth and tumorigenicity in human hepatocellular carcinoma cells

Oncogene volume 23, pages 1308–1313 (2004)Cite this article

Abstract

The gene deleted in liver cancer-1 (DLC-1) is located on human chromosome 8p21–22, a region thought to harbor tumor suppressor genes on the basis of its frequent deletion or loss of heterozygosity in a variety of human cancers, including hepatocellular carcinoma (HCC). Deletion or altered expression of DLC-1 is common in HCC. In the current study, the subcellular localization of Dlc-1 protein was determined by immunostaining with antibody to DLC-1 and the possible tumor growth suppressor activity of DLC-1 was investigated by examining the effects of of DLC-1 cDNA transfection in two human HCC cell lines lacking expression of the endogenous gene. The results show that Dlc-1protein is localized in the cell cytoplasm, and the restoration of DLC-1 expression in HCC cells resulted in caspase-3-mediated apoptosis, inhibition of cell growth and invasiveness in vitro as well as in reduction of the ability of the cells to form tumors in athymic nude mice. These observations thus support the notion that Dlc-1 protein is involved in hepatocarcinogenesis and has oncosuppressive activity in HCC.

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Abbreviations

DLC-1:

deleted in liver cancer-1

HCC:

hepatocellular carcinoma

GFP:

green fluorescent protein

RT–PCR:

reverse transcription–polymerase chain reaction

DAPI:

4′6-diamidino-2-phenylindole

FITC:

fluorescein isothiocyanate

PI:

propidium iodide

CGH:

comparative genomic hybridization

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Acknowledgements

We thank Dr Stanley Korsmeyer for advice and critical reading of the manuscript, Dr Susan Garfield and Stephen Wincovitch, for assistance with confocal microscopy and Barbara J Taylor, for the assistance with flow cytometry analysis.

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  1. Laboratory of Experimental Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, 20892, MD, USA

    Xiaoling Zhou, Snorri S Thorgeirsson & Nicholas C Popescu

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  1. Xiaoling Zhou
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  2. Snorri S Thorgeirsson
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  3. Nicholas C Popescu
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Correspondence to Nicholas C Popescu.

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Zhou, X., Thorgeirsson, S. & Popescu, N. Restoration of DLC-1 gene expression induces apoptosis and inhibits both cell growth and tumorigenicity in human hepatocellular carcinoma cells. Oncogene 23, 1308–1313 (2004). https://doi.org/10.1038/sj.onc.1207246

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