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Expression of MLN64 influences cellular matrix adhesion of breast cancer cells, the role for focal adhesion kinase

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The metastatic lymph node 64 (MLN64) gene was initially identified as highly expressed in the metastatic lymph node from breast cancer. It is localized in q12-q21 of the human chromosome 17 and is often co-amplified with erbB-2. However, the role played by MLN64 in breast cancer remains unclear. In the present study, the expression of MLN64 was examined in a breast cancer cohort using quantitative real-time PCR and immunohistochemical staining. It demonstrated that MLN64 was highly expressed in breast tumours compared to corresponding background tissues at both transcript level and protein level. The elevated level of MLN64 transcripts was correlated with the poor prognosis and overall survival of the patients. A panel of breast cancer cell sublines was subsequently developed by knockdown of MLN64 expression. Loss of MLN64 expression in MCF-7 cells resulted in a significant reduction of cell growth (absorbance for MCF-7ΔMLN64 being 0.87±0.07, P<0.01 vs. wild-type control (MCF-7WT 1.13±0.06) and transfection control (MCF-7pEF 1.27±0.05). In cell-matrix adhesion assay, MDA-MB-231ΔMLN64 cells showed a significant increase in adhesion (86±14), p<0.01 compared with both MDA-MB-231WT (61±20) and MDA-MB-231pEF (45±27). Further investigations demonstrated an increase in protein level of the focal adhesion kinase (FAK) in MDA-MB-231ΔMLN64 cells using Western blot analysis and immunofluorescent staining of FAK. Moreover, addition of FAK inhibitor to these cells diminished the effect of MLN64 on cell-matrix adhesion, suggesting that FAK contributed to the increased adhesion in MDA-MB-231ΔMLN64 cells. In conclusion, MLN64 is overexpressed in breast cancer, and its level correlates with poor prognosis and patient survival. MLN64 contributes to the development and progression of breast cancer through the regulation of cell proliferation and adhesive capacity.
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Document Type: Research Article

Affiliations: Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, UK

Publication date: April 1, 2010

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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