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lüll Regulation of BNIP3 in normal and cancer cells Lee H; Paik SGMol Cells 2006[Feb]; 21 (1): 1-6Bcl-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. Al-though it belongs to the Bcl-2 family and can hetero-dimerize 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 fac-tor (HIF), which binds to a site on the BNIP3 promoter. Silencing, followed by methylation, of the BNIP3 gene occurs in a significant proportion of can-cer 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 im-proved treatment of cancers and cardiovascular diseases.|*Gene Expression Regulation[MESH]|Cell Death[MESH]|Cell Hypoxia[MESH]|Humans[MESH]|Membrane Proteins/*metabolism[MESH]|Neoplasms/*metabolism[MESH]|Proto-Oncogene Proteins/*metabolism[MESH] |