Abstract:
:Hypoxia is a key factor contributing to the progression of human neoplasias and to the development of resistance to chemotherapy. BNIP3 is a proapoptotic member of the Bcl-2 protein family involved in hypoxia-induced cell death. We evaluated the expression and methylation status of BNIP3 gene to better understand the role of epigenetic alteration of its expression in haematopoietic tumours. Methylation of the region around the BNIP3 transcription start site was detected in four acute lymphocytic leukaemia, one multiple myeloma and one Burkitt lymphoma cell lines, and was closely associated with silencing the gene. That expression of BNIP3 was restored by treatment with 5-aza2'-deoxycytidine (5-aza-dC), a methyltransferase inhibitor, which confirmed the gene to be epigenetically inactivated by methylation. Notably, re-expression of BNIP3 using 5-aza2-dC also restored hypoxia-mediated cell death in methylated cell lines. Acetylation of histone H3 in the 5' region of the gene, which was assessed using chromatin immunoprecipitation assays, correlated directly with gene expression and inversely with DNA methylation. Among primary tumours, methylation of BNIP3 was detected in five of 34 (15%) acute lymphocytic leukaemias, six of 35 (17%) acute myelogenous leukaemias and three of 14 (21%) multiple myelomas. These results suggest that aberrant DNA methylation of the 5' CpG island and histone deacetylation play key roles in silencing BNIP3 expression in haematopoietic tumours.
journal_name
Br J Cancerjournal_title
British journal of cancerauthors
Murai M,Toyota M,Satoh A,Suzuki H,Akino K,Mita H,Sasaki Y,Ishida T,Shen L,Garcia-Manero G,Issa JP,Hinoda Y,Tokino T,Imai Kdoi
10.1038/sj.bjc.6602422subject
Has Abstractpub_date
2005-03-28 00:00:00pages
1165-72issue
6eissn
0007-0920issn
1532-1827pii
6602422journal_volume
92pub_type
杂志文章abstract::In the district of Srikakulam in Andhra Pradesh in South India the habit of reverse smoking is widespread. In a house to house survey of oral cancer and precancerous conditions, comprising 10,169 villagers, 43·8% were reverse smokers; the female: male ratio being 1·7: 1. Ten previously undiagnosed cases of oral cancer...
journal_title:British journal of cancer
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journal_title:British journal of cancer
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journal_title:British journal of cancer
pub_type: 杂志文章
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journal_title:British journal of cancer
pub_type: 杂志文章
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更新日期:1998-12-01 00:00:00
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journal_title:British journal of cancer
pub_type: 杂志文章
doi:10.1054/bjoc.1999.0993
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journal_title:British journal of cancer
pub_type: 杂志文章
doi:10.1038/bjc.1998.518
更新日期:1998-08-01 00:00:00
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journal_title:British journal of cancer
pub_type: 杂志文章
doi:10.1038/bjc.1982.97
更新日期:1982-04-01 00:00:00
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doi:10.1038/sj.bjc.6600419
更新日期:2002-07-15 00:00:00
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journal_title:British journal of cancer
pub_type: 杂志文章
doi:10.1038/bjc.1994.278
更新日期:1994-08-01 00:00:00
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pub_type: 杂志文章,随机对照试验
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更新日期:2006-09-18 00:00:00
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journal_title:British journal of cancer
pub_type: 杂志文章
doi:10.1038/bjc.2013.290
更新日期:2013-07-09 00:00:00
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doi:10.1038/sj.bjc.6601430
更新日期:2003-12-01 00:00:00
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journal_title:British journal of cancer
pub_type: 杂志文章
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更新日期:1978-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:1982-06-01 00:00:00
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更新日期:2004-07-05 00:00:00
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更新日期:2002-11-18 00:00:00
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pub_type: 杂志文章
doi:10.1038/sj.bjc.6606025
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journal_title:British journal of cancer
pub_type: 杂志文章
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更新日期:1985-05-01 00:00:00
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