Hypomethylation status of CpG sites at the promoter region and overexpression of the human MDR1 gene in acute myeloid leukemias

Masaharu Nakayama, Morimasa Wada, Taishi Harada, Jun Nagayama, Hitoshi Kusaba, Koichi Ohshima, Mitsuo Kozuru, Hirokazu Komatsu, Ryuzo Ueda, Michihiko Kuwano

研究成果: ジャーナルへの寄稿学術誌査読

166 被引用数 (Scopus)

抄録

Selection of human cells for resistance to vincristine or doxorubicin often induces overexpression of the multidrug resistance 1 gene (MDR1), which encodes the cell surface P-glycoprotein, as a result of gene amplification or transcriptional activation. Moreover, overexpression of the MDR1 gene has been shown to be associated closely with clinical outcome in various hematological malignancies, including acute myeloid leukemia (AML). However, the precise mechanism underlying overexpression of the MDR1 gene during acquisition of drug resistance remains unclear. We recently described an inverse correlation between the methylation status of CpG sites at the promoter region and expression of the MDR1 gene in malignant cell lines. In this study, we expanded this analysis to 42 clinical AML samples. We adapted a quantitative reverse transcription-polymerase chain reaction (RT-PCR) assay for gene expression and a quantitative PCR after digestion by Hpa II for methylation status of the MDR1 gene. We observed a statistically significant inverse correlation between methylation and MDR1 expression in clinical samples. The hypomethylation status of the MDR1 promoter region might be a necessary condition for MDR1 gene overexpression and establishment of P- glycoprotein-mediated multidrug resistance in AML patients.

本文言語英語
ページ(範囲)4296-4307
ページ数12
ジャーナルBlood
92
11
DOI
出版ステータス出版済み - 12月 1 1998

!!!All Science Journal Classification (ASJC) codes

  • 生化学
  • 免疫学
  • 血液学
  • 細胞生物学

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