Abstract
Expression of MACC1 (metastasis-associated in colon cancer-1) protein is associated with metastasis of various human cancers. This study analyzed MACC1 protein expression in hepatocellular carcinoma (HCC) tissue specimens and then investigated the effects of MACC1 knockdown on HCC cell migration and invasion, and gene expression levels. Sixty pairs of HCC and adjacent normal liver tissues from HCC patients were analyzed for MACC1 expression immunohistochemically. The HCC cell lines Hep3B, Huh7, MHCC97H, SMMC-7721, Bel-7402, and HepG2 and the normal liver cell line LO2 were used to assess expressions of MACC1 mRNA and MACC1 protein using qRT-PCR and western blot, respectively. MACC1 short hairpin RNA (shRNA) was used to knockdown MACC1 protein expression in Huh7 cells. Changes in the tumor phenotype of these cells were analyzed with wound healing assay and invasion assays, and differences in gene expression were evaluated via western blot. Immunofluorescence was used to locate MACC1 protein in the above cell lines. MACC1 was highly expressed in HCC tissues and the nuclear expression of MACC1 protein was associated with poor tumor differentiation and intrahepatic metastasis or portal invasion. Moreover, MACC1 mRNA and MACC1 protein was also expressed in HCC cell lines. Immunostaining showed that MACC1 protein was localized in both nuclei and cytoplasm of HCC cell lines and the nuclear localization of MACC1 protein was associated with increased aggressiveness of HCC in cell lines. Knockdown of MACC1 expression using MACC1-shRNA reduced Huh7 cell migration and invasion abilities, which was associated with downregulation of MMP2, MMP9, and c-Met proteins in Huh7 cells. Localization of MACC1 protein to the nucleus may predict HCC progression. Knockdown of MACC1 expression using MACC1 shRNA warrants further evaluation as a novel therapeutic strategy for control of HCC.
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Abbreviations
- c-Met:
-
Hepatocyte growth factor receptor
- HCC:
-
Hepatocellular carcinoma
- MACC1:
-
Metastasis-associated colon cancer 1
- MMP2/9:
-
Matrix metalloproteinase 2/9
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Acknowledgments
We thank Medjaden Bioscience Limited, Hong Kong, China, for assisting in the preparation of this manuscript. This study was supported in part by grants from the National Natural Scientific Foundation of China (No. 81071897 to YY).
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11010_2012_1545_MOESM1_ESM.tif
Supplement Figure 1: Knockdown of MACC1 mRNA expression by MACC1-1 and MACC1-2 shRNA transfection. The HCC cells were grown and transiently transfected with MACC1-1 and MACC1-2 siRNA for 24 h or 48 h and total cellular RNA was isolated and subjected to RT-PCR analysis (TIFF 88 kb)
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Gao, J., Ding, F., Liu, Q. et al. Knockdown of MACC1 expression suppressed hepatocellular carcinoma cell migration and invasion and inhibited expression of MMP2 and MMP9. Mol Cell Biochem 376, 21–32 (2013). https://doi.org/10.1007/s11010-012-1545-y
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DOI: https://doi.org/10.1007/s11010-012-1545-y