Genetic deletion of granzyme B does not confer resistance to the development of spontaneous diabetes in non-obese diabetic mice
| Autor: | Hitoshi Sasaki, Hironori Yamasaki, Shoichi Akazawa, T. Uchida, C Kaneko-Koike, Eiji Kawasaki, Masakazu Kobayashi, Genpei Kuriya, Kan Nakamura, Tsuyoshi Satoh, Norio Abiru, A. Kawakami, Hiroaki Ida, Yuji Nagayama |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Male
Regulatory T cell Immunology Apoptosis Nod T-Lymphocytes Regulatory Granzymes Lymphocyte Depletion Diabetes Mellitus Experimental GZMB Islets of Langerhans Mice Mice Inbred NOD T-Lymphocyte Subsets medicine Animals Immunology and Allergy Cytotoxic T cell fas Receptor NOD mice Mice Knockout biology Perforin Deficiency Adoptive Transfer Granzyme B Diabetes Mellitus Type 1 medicine.anatomical_structure Gene Expression Regulation Perforin biology.protein Female Gene Deletion |
| Zdroj: | Clinical and Experimental Immunology. 173:411-418 |
| ISSN: | 1365-2249 0009-9104 |
| DOI: | 10.1111/cei.12134 |
| Popis: | Summary Granzyme B (GzmB) and perforin are proteins, secreted mainly by natural killer cells and cytotoxic T lymphocytes that are largely responsible for the induction of apoptosis in target cells. Because type 1 diabetes results from the selective destruction of β cells and perforin deficiency effectively reduces diabetes in non-obese diabetic (NOD) mice, it can be deduced that β cell apoptosis involves the GzmB/perforin pathway. However, the relevance of GzmB remains totally unknown in non-obese diabetic (NOD) mice. In this study we have focused on GzmB and examined the consequence of GzmB deficiency in NOD mice. We found that NOD.GzmB–/– mice developed diabetes spontaneously with kinetics similar to those of wild-type NOD (wt-NOD) mice. Adoptive transfer study with regulatory T cell (Treg)-depleted splenocytes (SPCs) into NOD-SCID mice or in-vivo Treg depletion by anti-CD25 antibody at 4 weeks of age comparably induced the rapid progression of diabetes in the NOD.GzmB–/– mice and wt-NOD mice. Expression of GzmA and Fas was enhanced in the islets from pre-diabetic NOD.GzmB–/– mice. In contrast to spontaneous diabetes, GzmB deficiency suppressed the development of cyclophosphamide-promoted diabetes in male NOD mice. Cyclophosphamide treatment led to a significantly lower percentage of apoptotic CD4+, CD8+ and CD4+CD25+ T cells in SPCs from NOD.GzmB–/– mice than those from wt-NOD mice. In conclusion, GzmB, in contrast to perforin, is not essentially involved in the effector mechanisms for β cell destruction in NOD mice. |
| Databáze: | OpenAIRE |
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