title: [Molecular mechanism of proliferation of human breast cancer cell MCF-7 inhibited by E1A gene].
abstract: OBJECTIVE
  To explore the molecular mechanism of proliferation inhibition of human breast cancer cell MCF-7 regulated by E1A gene.
  
  
  METHODS
  E1A gene was transfected into MCF-7 cells by liposome reagents. RT-PCR and Western blot were used to detect E1A mRNA and protein expression and HER-2 mRNA in MCF-7. The proliferation and colony formation of MCF-7 were measured by 3-(4,5-dinmethylthiahiazo-z-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and soft agar formation assay. The apoptosis of MCF-7 cells regulated by E1A expression was examined by flow cytometry.
  
  
  RESULTS
  E1A was not endogenously expressed in MCF-7. E1A expression in MCF-7 could significantly decrease HER-2 mRNA and protein expression. Flow cytometry indicated that the apoptosis of MCF-7 could be induced by E1A. Meanwhile, E1A gene could significantly inhibit MCF-7 proliferation and colony formation in soft agar.
  
  
  CONCLUSIONS
  E1A gene can decrease HER-2 expression and induce the apoptosis of human breast cancer cell MCF-7, and inhibit the proliferation and colony formation of MCF-7.
authors.affiliation: Department of Oncology, Xiangya Hospital, Central South University, Changsha 410008, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Chen
authors.forename: Liang-Fang
authors.initials: LF
authors.lastname: Shen
authors.forename: Mei-Zuo
authors.initials: MZ
authors.lastname: Zhong
mesh_terms: D017500:Adenovirus E1A Proteins / Q000096:biosynthesis / Q000235:genetics*; D017209:Apoptosis / Q000235:genetics*; D001943:Breast Neoplasms / Q000235:genetics* / Q000378:metabolism; D049109:Cell Proliferation; D005260:Female; D018734:Genes, erbB-2 / Q000235:genetics; D006801:Humans; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000096:biosynthesis* / Q000235:genetics; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D017500:Adenovirus E1A Proteins; D012333:RNA, Messenger; D018719:Erb-b2 Receptor Tyrosine Kinases; C508053:ERBB2 protein, human