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lüll Bifunctional apoptosis inhibitor (BAR) protects neurons from diverse cell death pathways Roth W; Kermer P; Krajewska M; Welsh K; Davis S; Krajewski S; Reed JCCell Death Differ 2003[Oct]; 10 (10): 1178-87The bifunctional apoptosis regulator (BAR) is a multidomain protein that was originally identified as an inhibitor of Bax-induced apoptosis. Immunoblot analysis of normal human tissues demonstrated high BAR expression in the brain, compared to low or absent expression in other organs. Immunohistochemical staining of human adult tissues revealed that the BAR protein is predominantly expressed by neurons in the central nervous system. Immunofluorescence microscopy indicated that BAR localizes mainly to the endoplasmic reticulum (ER) of cells. Overexpression of BAR in CSM 14.1 neuronal cells resulted in significant protection from a broad range of cell death stimuli, including agents that activate apoptotic pathways involving mitochondria, TNF-family death receptors, and ER stress. Downregulation of BAR by antisense oligonucleotides sensitized neuronal cells to induction of apoptosis. Moreover, the search for novel interaction partners of BAR identified several candidate proteins that might contribute to the regulation of neuronal apoptosis (HIP1, Hippi, and Bap31). Taken together, the expression pattern and functional data suggest that the BAR protein is involved in the regulation of neuronal survival.|*Adaptor Proteins, Signal Transducing[MESH]|*DNA-Binding Proteins[MESH]|Amino Acid Sequence[MESH]|Animals[MESH]|Antibodies, Monoclonal/pharmacology[MESH]|Apoptosis Regulatory Proteins[MESH]|Apoptosis/drug effects/*physiology[MESH]|Arabidopsis Proteins/genetics/metabolism[MESH]|Blotting, Western[MESH]|Brain Chemistry[MESH]|COS Cells[MESH]|Carrier Proteins/genetics/metabolism/*physiology[MESH]|Caspase 8[MESH]|Caspases/genetics/metabolism[MESH]|Cell Line[MESH]|Cell Line, Tumor/drug effects/metabolism[MESH]|Cell Survival/drug effects/physiology[MESH]|Chlorocebus aethiops[MESH]|Culture Media, Serum-Free/pharmacology[MESH]|Down-Regulation[MESH]|Endoplasmic Reticulum/chemistry[MESH]|Fatty Acid Desaturases/genetics/metabolism[MESH]|Gene Expression Regulation[MESH]|Green Fluorescent Proteins[MESH]|Humans[MESH]|Immunohistochemistry[MESH]|Luminescent Proteins/genetics/metabolism[MESH]|Male[MESH]|Membrane Proteins/genetics/metabolism/*physiology[MESH]|Microscopy, Fluorescence[MESH]|Molecular Sequence Data[MESH]|Nervous System/chemistry[MESH]|Neurons/*physiology[MESH]|Oligodeoxyribonucleotides, Antisense/genetics/metabolism[MESH]|Protein Binding[MESH]|Proto-Oncogene Proteins c-bcl-2/metabolism[MESH]|Proto-Oncogene Proteins/genetics/metabolism/*physiology[MESH]|Rats[MESH]|Sequence Homology, Amino Acid[MESH]|Signal Transduction/*physiology[MESH]|Staurosporine/pharmacology[MESH]|Thapsigargin/pharmacology[MESH]|Transfection[MESH]|Tumor Necrosis Factor-alpha/pharmacology[MESH]|fas Receptor/immunology[MESH] |