title: [Studies on gene expression and the 5' CpG islands methylation status of E-cadherin in acute myeloid leukemia].
abstract: OBJECTIVE
  To study the relationship between E-cadherin gene expression and the methylation status of E-cadherin 5' CpG islands in acute myeloid leukemia (AML).
  
  
  METHODS
  Reverse transcription-PCR (RT-PCR), flow cytometry and methylation specific PCR were used to analyze the E-cadherin gene and protein expression and its 5' CpG island methylation status respectively in bone marrow cells from 55 AML patients and 7 normal controls.
  
  
  RESULTS
  AML cells displayed a significant reduction or lack of E-cadherin gene and protein expression, the positive rates were 23.6% and 18.2% (P < 0.01), respectively. All normal bone marrow cells were E-cadherin positive. Thirty-eight of the 55 patients (69.1%) were E-cadherin 5' CpG island methylated whereas the normal controls were completely unmethylated. Twenty-nine of thirty-one (93.5%) E-cadherin-negative samples showed abnormal hypermethylation of the E-cadherin CpG islands.
  
  
  CONCLUSIONS
  Expression downregulation and methylation of E-cadherin gene in AML suggest that it might be an important event in AML. E-cadherin methylation was associated with the inhibition of E-cadherin gene and protein expression in AML.
authors.affiliation: Department of Hematology, The First Affiliated Hospital, China Medical University, Shenyang 110001, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Gao
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Xiang-lan
authors.initials: XL
authors.lastname: Lu
authors.forename: Xia
authors.initials: X
authors.lastname: Li
authors.forename: Ping-ping
authors.initials: PP
authors.lastname: Wang
authors.forename: Yun-peng
authors.initials: YP
authors.lastname: Liu
mesh_terms: D015820:Cadherins / Q000235:genetics*; D018899:CpG Islands / Q000235:genetics*; D019175:DNA Methylation; D015870:Gene Expression; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000235:genetics*
chemical_list: D015820:Cadherins