Abstract
Cytotoxic T lymphocytes (CTL) induce apoptosis by engaging death receptors or by exocytosis of cytolytic granules containing granzyme (Gzm) proteases and perforin. The lamins, which maintain the structural integrity of the nuclear envelope, are cleaved by caspases during caspase-mediated apoptosis. Although death receptor engagement and GzmB activate caspases, CTL also induce apoptosis during caspase blockade. Both GzmA and GzmB directly and efficiently cleave laminBin vitro,in situin isolated nuclei and in cells loaded with perforin and Gzms, even in the presence of caspase inhibitors. LaminB is cleaved by GzmA at concentrations of 3 nM, but GzmB is 50 times less active. GzmA cuts laminB at R392; GzmB cuts at the caspase VEVD231 site. Characteristic laminB fragments generated by Gzm proteolysis also are observed during CTL lysis, even in the presence of caspase inhibitors or in cells overexpressing bcl-2. Lamins A/C are direct substrates of GzmA, but not GzmB. GzmA and GzmB therefore directly target critical caspase substrates in caspase-resistant cells.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 10:44 a.m.) |
Deposited | 1 year, 7 months ago (Jan. 4, 2024, 12:12 a.m.) |
Indexed | 1 month, 1 week ago (July 23, 2025, 9:01 a.m.) |
Issued | 24 years, 3 months ago (May 1, 2001) |
Published | 24 years, 3 months ago (May 1, 2001) |
Published Online | 24 years, 3 months ago (May 1, 2001) |
Published Print | 24 years, 3 months ago (May 8, 2001) |
@article{Zhang_2001, title={Granzymes A and B directly cleave lamins and disrupt the nuclear lamina during granule-mediated cytolysis}, volume={98}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.101329598}, DOI={10.1073/pnas.101329598}, number={10}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Zhang, Dong and Beresford, Paul J. and Greenberg, Arnold H. and Lieberman, Judy}, year={2001}, month=may, pages={5746–5751} }