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Heat Shock Protein 75 (TRAP1) Antagonizes Reactive Oxygen Species Generation and Protects Cells from Granzyme M-mediated Apoptosis
Open accessAbstract
Natural killer (NK) cells play an important role in innate immunity against virally infected or transformed cells as the first defense line. Granzyme M (GzmM) is an orphan granzyme that is constitutively highly expressed in NK cells and is consistent with NK cell-mediated cytolysis. We recently demonstrated that GzmM induces caspase-dependent apoptosis with DNA fragmentation through direct cleavage of inhibitor of caspase-activated DNase (ICAD). However, the molecular mechanisms for GzmM-induced apoptosis are unclear. We found GzmM causes mitochondrial swelling and loss of mitochondrial transmembrane potential. Moreover, GzmM initiates reactive oxygen species (ROS) generation and cytochrome c release. Heat shock protein 75 (HSP75, also known as TRAP1) acts as an antagonist of ROS and protects cells from GzmM-mediated apoptosis. GzmM cleaves TRAP1 and abolishes its antagonistic function to ROS, resulting in ROS accumulation. Silencing TRAP1 through RNA interference increases ROS accumulation, whereas TRAP1 overexpression attenuates ROS production. ROS accumulation is in accordance with the release of cytochrome c from mitochondria and enhances GzmM-mediated apoptosis.
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Danial, N. N., & Korsmeyer, S. J. (2004) · Cell · doi:10.1016/s0092-8674(04)00046-7 · Cited by 4,651
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Metadata
- Authors
- Hua, G., Zhang, Q., & Fan, Z.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2007-07
- Volume
- 282
- Issue
- 28
- Pages
- 20553-20560
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2014656971
- Cited by
- 187
- References
- 1
- FWCI
- 4.91
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- Hua, G., Zhang, Q., & Fan, Z. (2007). Heat Shock Protein 75 (TRAP1) Antagonizes Reactive Oxygen Species Generation and Protects Cells from Granzyme M-mediated Apoptosis. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.m703196200
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