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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Jordan, Michael B. Tabata, Yasuhiro Figueira, Sarah K. Butler, Braeden L. Filipovich, Alexandra Li, Jinzhu Binkowski, Brock F. Risma, Kimberly A. Vrazo, Alexandra C. A. |
| Description | Author Affiliation: Li J ( Division of Allergy/Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229); Figueira SK ( Division of Allergy/Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229); Vrazo AC ( Division of Allergy/Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229); Binkowski BF ( Promega Corp., Madison, WI 53704); Butler BL ( Promega Corp., Madison, WI 53704); Tabata Y ( Division of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229); Filipovich A ( Division of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229); Jordan MB ( Division of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229); Risma KA ( Division of Allergy/Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229) |
| Abstract | Activation of caspase-mediated apoptosis is reported to be a hallmark of both granzyme B- and Fas-mediated pathways of killing by CTLs; however, the kinetics of caspase activation remain undefined owing to an inability to monitor target cell-specific apoptosis in real time. We have overcome this limitation by developing a novel biosensor assay that detects continuous, protease-specific activity in target cells. Biosensors were engineered from a circularly permuted luciferase, linked internally by either caspase 3/7 or granzyme B/caspase 8 cleavage sites, thus allowing activation upon proteolytic cleavage by the respective proteases. Coincubation of murine CTLs with target cells expressing either type of biosensor led to a robust luminescent signal within minutes of cell contact. The signal was modulated by the strength of TCR signaling, the ratio of CTL/target cells, and the type of biosensor used. Additionally, the luciferase signal at 30 min correlated with target cell death, as measured by a (51)Cr-release assay. The rate of caspase 3/7 biosensor activation was unexpectedly rapid following granzyme B- compared with Fas-mediated signal induction in murine CTLs; the latter appeared gradually after a 90-min delay in perforin- or granzyme B-deficient CTLs. Remarkably, the Fas-dependent, caspase 3/7 biosensor signal induced by perforin-deficient human CTLs was also detectable after a 90-min delay when measured by redirected killing. Thus, we have used a novel, real-time assay to demonstrate the distinct pattern of caspase activation induced by granzyme B versus Fas in human and murine CTLs. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| DOI | 10.4049/jimmunol.1301668 |
| Journal | The Journal of Immunology |
| Issue Number | 2 |
| Volume Number | 193 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2014-07-15 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, Cd95 Immunology Caspases Granzymes T-lymphocytes, Cytotoxic Animals Metabolism Apoptosis Binding Sites Genetics Caspase 3 Caspase 7 Cell Line, Tumor Cytotoxicity Tests, Immunologic Cytotoxicity, Immunologic Enzyme Activation Luciferases Luminescent Measurements Mice Mice, Inbred C57bl Mice, Knockout Mice, Transgenic Perforin Signal Transduction Time Factors Research Support, N.i.h., Extramural Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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