Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Regulation of BNIP3 in Normal and Cancer Cells

  • Lee, Hayyoung (Institute of Biotechnology, Chungnam National University) ;
  • Paik, Sang-Gi (Department of Biology, School of Biosciences and Biotechnology, Chungnam National University)
  • Published : 2006.02.28
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Abstract

Bcl-2/adenovirus E1B 19 kDa-interacting protein 3 (BNIP3) is a mitochondrial pro-apoptotic protein that has a single Bcl-2 homology 3 (BH3) domain and a COOH-terminal transmembrane (TM) domain. Although it belongs to the Bcl-2 family and can heterodimerize with Bcl-2, its pro-apoptotic activity is distinct from those of other members of the Bcl-2 family. For example, cell death mediated by BNIP3 is independent of caspases and shows several characteristics of necrosis. Furthermore, the TM domain, but not the BH3 domain, is required for dimerization, mitochondrial targeting and pro-apoptotic activity. BNIP3 plays an important role in hypoxia-induced death of normal and malignant cells. Its expression is markedly increased in the hypoxic regions of some solid tumors and appears to be regulated by hypoxia-inducible factor (HIF), which binds to a site on the BNIP3 promoter. Silencing, followed by methylation, of the BNIP3 gene occurs in a significant proportion of cancer cases, especially in pancreatic cancers. BNIP3 also has a role in the death of cardiac myocytes in ischemia. Further studies of BNIP3 should provide insight into hypoxic cell death and may contribute to improved treatment of cancers and cardiovascular diseases.

Keywords

Acknowledgement

Supported by : Korea Research Foundation

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