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Serglycin-deficient cytotoxic T lymphocytes display defective secretory granule maturation and granzyme B storage
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Genetics and Pathology. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular Biology.
Department of Molecular Biosciences, Swedish University of Agricultural Sciences, Uppsala, Sweden.
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2005 (English)In: Journal of Biological Chemistry, ISSN 0021-9258, E-ISSN 1083-351X, Vol. 280, no 39, 33411-33418 p.Article in journal (Refereed) Published
Abstract [en]

Cytotoxic T lymphocytes eliminate infected and tumor cells mainly by perforin/granzyme-induced apoptosis. Earlier studies suggested that serglycin-proteoglycans form macromolecular complexes with granzymes and perforin in the cytotoxic granule. Serglycin-proteoglycans may also be involved in the delivery of the cytolytic machinery into target cells. We have developed a serglycin-deficient mouse strain, and here we studied the importance of serglycin-proteoglycans for various aspects of cytotoxic T lymphocyte function. 35SO4(2-) radiolabeling of serglycin-deficient cells demonstrated a dramatic reduction of incorporated label as compared with wild type cells, indicating that serglycin is by far the dominating proteoglycan species produced by the cytotoxic T lymphocyte. Moreover, lack of serglycin resulted in impaired ability of cytotoxic T lymphocytes to produce secretory granule of high electron density, although granule of lower electron density were produced both in wild type and serglycin-deficient cells. The serglycin deficiency did not affect the mRNA expression for granzyme A, granzyme B, or perforin. However, the storage of granzyme B, but not granzyme A, Fas ligand, or perforin, was severely defective in serglycin-deficient cells. Serglycin-deficient cells did not display defects in late cytotoxicity toward target cell lines. Taken together, these results point to a key role for serglycin in the storage of granzyme B and for secretory granule maturation but argue against a major role for serglycin in the apoptosis mediated by cytotoxic T lymphocytes.

Place, publisher, year, edition, pages
2005. Vol. 280, no 39, 33411-33418 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-74475DOI: 10.1074/jbc.M501708200PubMedID: 16046402OAI: oai:DiVA.org:uu-74475DiVA: diva2:102385
Available from: 2005-09-29 Created: 2005-09-29 Last updated: 2014-11-18Bibliographically approved

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Eloranta, Maija-LeenaKnight, Stefan D.
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