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*
Institut National de la Santé et de la Recherche Médicale Unité 25, Hôpital Necker, Paris, France; and
Laboratoire d’Immunologie-Immunopathologie, Centre Hospitalier Universitaire, Poitiers, France
The NK1.1 cell surface receptor, which belongs to the NKR-P1 gene cluster, has been bred onto nonobese diabetic (NOD) mice for two purposes. The first was to tag NK and NKT cells for easier experimental identification of those subsets and better analysis of their implication in type 1 diabetes. The second was to produce a congenic strain carrying Idd6, a susceptibility locus that has been repeatedly mapped in the vicinity of the NKR-P1 gene cluster and the NK complex, to explore the impact of this locus upon autoimmune diabetes. NOD.NK1.1 mice express the NK1.1 marker selectively on the surface of their NK and NKT cell subsets. In addition, the mice manifest reduced disease incidence and improved NK and NKT cell performance, as compared with wild-type NOD mice. The association of those two features in the same congenic strain constitutes a strong argument in favor of Idd6 being associated to the NK complex. This could explain at the same time the multiple alterations of innate immunity reported in NOD mice and the fact that disease onset can be readily modified by boosting the innate immune system of the mouse.
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