title: [Promoter methylation and mRNA expression of APC gene in MCF10 breast cancer model].
abstract: OBJECTIVE
  To investigate the promoter methylation status and mRNA expression of APC gene in MCF10 model of breast cancer progression.
  
  
  METHODS
  Methylation specific PCR and sodium bisufite genomic sequencing were employed to detect the methylation status of APC promoter 1A in normal breast tissues, conventional breast cancer cell line MCF-7 and MCF10 model cell lines including MCF10A (breast hyperplastic cell line, non-tumorigenic), MCF10AT (pre-malignant cell lines, producing slowly progressing hyperplastic and dysplastic lesions), MCF10DCIS.com (breast ductal carcinoma in-situ cell line, producing ductal carcinoma in-situ), MCF10CA1a, MCF10CA1d, MCF10CA1h cell lines (invasive breast carcinoma cell line, forming aggressive tumors of different morphology and metastatic potential). In addition, mRNA expression of APC was determined by reverse transcriptase PCR and real-time PCR assays.
  
  
  RESULTS
  Hypomethylation of APC promoter 1A was identified in hyperplastic cell line MCF10A, pre-malignant cell line MCF10AT, ductal carcinoma in-situ cell line MCF10DCIS.com, invasive carcinoma cell lines MCF10CA1a, MCF10CA1d, MCF10CA1h and normal breast tissue. MCF-7 showed partial methylation at the promoter. Statistically significant reduction of APC mRNA expression was not found in all MCF10 cell lines and MCF-7, compared with that of normal breast tissue (MCF10AT, MCF10CA1a, MCF10CA1d, MCF10CA1h and MCF10DCIS.com showed reduced mRNA expressions of APC at 0.27, 0.96, 1.78, 2.70, and 2.03 times respectively. MCF10A and MCF-7 even showed an increase of APC mRNA expression at 0.02 and 0.33 times, respectively).
  
  
  CONCLUSIONS
  The aberrant promoter methylation of APC is not related to the breast cancer progression, at least in the MCF10 model system.
authors.affiliation: Department of Pathology, Kunming General Hospital, Kunming 650032, China. yangjulun@yahoo.com
authors.forename: Ju-lun
authors.initials: JL
authors.lastname: Yang
authors.forename: David
authors.initials: D
authors.lastname: Klinkebiel
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Boland
authors.forename: Lin
authors.initials: L
authors.lastname: Tang
authors.forename: Judith K
authors.initials: JK
authors.lastname: Christman
mesh_terms: D025601:Adenomatous Polyposis Coli Protein / Q000096:biosynthesis / Q000235:genetics*; D001940:Breast / Q000473:pathology; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D045744:Cell Line, Tumor; D019175:DNA Methylation; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D017491:Genes, APC; D006801:Humans; D006965:Hyperplasia / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D011230:Precancerous Conditions / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D011401:Promoter Regions, Genetic / Q000235:genetics*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics
chemical_list: D025601:Adenomatous Polyposis Coli Protein; D012333:RNA, Messenger