The microbial product lipopolysaccharide confers diabetogenic potential on the T cell repertoire of BDC2.5/NOD mice : implications for the etiology of autoimmune diabetes
Copyright 2000 Academic Press.
| Veröffentlicht in: | Clinical immunology (Orlando, Fla.). - 1999. - 95(2000), 2 vom: 01. Mai, Seite 93-8 |
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| Weitere Verfasser: | , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2000
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| Zugriff auf das übergeordnete Werk: | Clinical immunology (Orlando, Fla.) |
| Schlagworte: | Journal Article Lipopolysaccharides |
| Zusammenfassung: | Copyright 2000 Academic Press. Both genetic predisposition and environmental factors participate in the etiology of Type-1 diabetes. To test the role of the microbial product lipopolysaccharide (LPS) as an environmental trigger of autoimmune diabetes, we employed transgenic (tg) BDC2.5/NOD mice that bear an islet-specific CD4(+) T cell repertoire (>95%), but do not develop the spontaneous diabetes that typifies the NOD (nonobese diabetic) strain. LPS administration provoked diabetes in BDC2.5/NOD mice by their 16th week of age. However, LPS administration in NOD mice did not accelerate their diabetes. This finding indicates that the frequency of islet-specific T cells influences LPS-mediated diabetes. Furthermore, in vitro LPS-cultured splenocytes from BDC2. 5/NOD and BDC2.5-microMT (B-cell-deficient) mice effectively transferred diabetes into immunodeficient NOD-scid/scid mice but not immunosufficient NOD mice. Therefore, B lymphocytes are not required for LPS-provoked autoimmune diabetes. Flow cytometric analysis then revealed that LPS-stimulation in vitro induced the expression of an IL-2 receptor (CD25) on CD4 T cells; this indicates that the activation of islet-specific T cells is a prerequisite to eliciting diabetes in this situation. Overall, these results point to microbial LPS as an etiopathogenic agent of autoimmune diabetes |
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| Beschreibung: | Date Completed 16.06.2000 Date Revised 17.11.2004 published: Print Citation Status MEDLINE |
| ISSN: | 1521-7035 |