title: Functional elucidation and methylation-mediated downregulation of ITGA5 gene in breast cancer cell line MDA-MB-468.
abstract: Expression level of integrin alpha5 in tumor cells has been indicated to be involved in cell proliferation and organ-specific metastasis. We previously demonstrated that ITGA5 expression was downregulated in the high invasive MDA-MB-468 cells compared with other breast cancer cell lines. In this study, we found that the methylation status in the region around transcriptional start site of ITGA5 gene was increased in MDA-MB-468 cells. Overexpression of integrin alpha5 on MDA-MB-468 cells resulted in cell growth inhibition, which could be reversed by adhesion to fibronectin. Cell adhesion and spreading to fibronectin was enhanced after ITGA5 was overexpressed in MDA-MB-468 cells, while cell migration was attenuated. Knockdown of ITGA5 in MCF-7 cells led to cell growth inhibition but had little influence on cell migration. These findings indicated the diverse roles of ITGA5 expression in breast cancer cells.
authors.affiliation: Biomedical Research Institute, Shenzhen-PKU-HKUST Medical Center, Guangdong Province, Shenzhen, PR China.
authors.forename: Zhengyu
authors.initials: Z
authors.lastname: Fang
authors.forename: Wantong
authors.initials: W
authors.lastname: Yao
authors.forename: Yi
authors.initials: Y
authors.lastname: Xiong
authors.forename: Jufeng
authors.initials: J
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Jiana
authors.initials: J
authors.lastname: Li
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Wan
mesh_terms: D015153:Blotting, Western; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002448:Cell Adhesion; D002453:Cell Cycle; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D018899:CpG Islands / Q000235:genetics*; D019175:DNA Methylation; D015536:Down-Regulation; D005260:Female; D005353:Fibronectins / Q000378:metabolism; D005434:Flow Cytometry; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D039482:Integrin alpha5 / Q000235:genetics* / Q000378:metabolism; D009154:Mutation; D011401:Promoter Regions, Genetic / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D005353:Fibronectins; D039482:Integrin alpha5