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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Shelton, Shary N. Shawgo, Mary E. Robertson, John D. |
| Description | Author Affiliation: Shelton SN ( Department of Pharmacology, Toxicology & Therapeutics and the Kansas University Cancer Center, University of Kansas Medical Center, Kansas City, Kansas 66160, USA.) |
| Abstract | The extent to which the BH3-only protein Bid is important for intrinsic (mitochondria-mediated) apoptotic cell death induced by genotoxic stress remains controversial. In the present study, we examine this issue using a panel of gene-manipulated Bax-deficient Jurkat T-lymphocytes. Cells stably depleted of Bid were far less sensitive than control-transfected cells to etoposide-induced apoptosis. In particular, drug-induced Bak activation, cytochrome c release, loss of mitochondrial membrane potential, and caspase activation were all decreased in cells lacking Bid. Reconstitution experiments using recombinant proteins and permeabilized Bid-deficient cells demonstrated that truncated Bid (tBid), but not full-length Bid, potently induced Bak activation and the release of cytochrome c. Further, caspase-8-deficient Jurkat cells efficiently cleaved Bid and were sensitive to drug-induced apoptosis. By comparison, Apaf-1-deficient cells, as well as cells overexpressing full-length X-linked inhibitor of apoptosis protein (XIAP) or the BIR1/BIR2 domains of XIAP, failed to cleave Bid in response to genotoxic stress. These data suggest that tBid plays an important regulatory role in the execution of DNA damage-induced cytochrome c release and apoptosis. However, the fact that cleavage of Bid to tBid is mediated by executioner caspases suggests that a self-amplifying feed forward loop involving caspases, Bid, and mitochondria may help determine irreversible commitment to apoptosis. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 17 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-04-24 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | BH3 Interacting Domain Death Agonist Protein Metabolism Caspases Gene Expression Regulation Mitochondrial Membranes Antineoplastic Agents Pharmacology Apoptosis Caspase 8 Cell Separation Cytochromes c DNA Damage Etoposide Jurkat Cells Models, Biological T-Lymphocytes Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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