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  Surface cathepsin B protects cytotoxic lymphocytes from self- destruction after degranulation

Balaji, K. N., Schaschke, N., Machleidt, W., Catalfamo, M., & Henkart, P. A. (2002). Surface cathepsin B protects cytotoxic lymphocytes from self- destruction after degranulation. Journal of Experimental Medicine, 196(4), 493-503.

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Genre: Journal Article
Alternative Title : J. Exp. Med.

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 Creators:
Balaji, K. N., Author
Schaschke, N.1, Author              
Machleidt, W.2, Author              
Catalfamo, M., Author
Henkart, P. A., Author
Affiliations:
1Moroder, Luis / Bioorganic Chemistry, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565160              
2External Organizations, ou_persistent22              

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Free keywords: CTL; cytotoxicity; protease; granule; exocytosis
 Abstract: The granule exocytosis cytotoxicity pathway is the major molecular mechanism for cytotoxic T lymphocyte (CTL) and natural killer (NK) cytotoxicity, but the question of how these cytotoxic lymphocytes avoid self-destruction after secreting perforin has remained unresolved. We show that CTL and NK cells die within a few hours if they are triggered to degranulate in the presence of nontoxic thiol cathepsin protease inhibitors. The potent activity of the impermeant, highly cathepsin B- specific membrane inhibitors CA074 and NS-196 strongly implicates extracellular cathepsin B. CTL suicide in the presence of cathepsin inhibitors requires the granule exocytosis cytotoxicity pathway, as it is normal with CTLs from gld mice, but does not occur in CTLs from perforin knockout mice. Flow cytometry shows that CTLs express low to undetectable levels of cathepsin B on their surface before degranulation, with a substantial rapid increase after T cell receptor triggering. Surface cathepsin B eluted from live CTL after degranulation by calcium chelation is the single chain processed form of active cathepsin B. Degranulated CTLs are surface biotinylated by the cathepsin B-specific affinity reagent NS-196, which exclusively labels immuno reactive cathepsin B. These experiments support a model in which granule-derived surface cathepsin B provides self-protection for degranulating cytotoxic lymphocytes.

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Language(s): eng - English
 Dates: 2002-08-19
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 41681
ISI: 000177669300008
 Degree: -

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Title: Journal of Experimental Medicine
  Alternative Title : J. Exp. Med.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 196 (4) Sequence Number: - Start / End Page: 493 - 503 Identifier: ISSN: 0022-1007