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J. Biol. Chem., Vol. 280, Issue 39, 33411-33418, September 30, 2005

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Serglycin-deficient Cytotoxic T Lymphocytes Display Defective Secretory Granule Maturation and Granzyme B Storage^*

Mirjana Grujic, Tiago Braga, Agneta Lukinius, Maija-Leena Eloranta, Stefan D. Knight¶, Gunnar Pejler, and Magnus Åbrink1

From the Department of Molecular Biosciences, Swedish University of Agricultural Sciences, The Biomedical Center, Box 575, 751 23 Uppsala, the Department of Genetics and Pathology, Rudbeck Laboratory, Uppsala University, 751 85 Uppsala, and the Department of Molecular Biology, ^¶Swedish University of Agricultural Sciences, Uppsala Biomedical Center, Box 590, SE-753 24 Uppsala, Sweden

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. 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.

Received for publication, February 15, 2005 , and in revised form, July 7, 2005.

^* The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

¹ To whom correspondence should be addressed. Tel.: 46-18-471-4192; Fax: 46-18-550-762; E-mail: magnus.abrink{at}bmc.uu.se.

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