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The mouse strain MRL/MpJ is prone to spontaneously develop autoimmune pancreatitis (AIP). To elucidate the genetic control towards the development of the phenotype and to characterize contributions of immunocompetent cell types, MRL/MpJ mice were interbred with three additional strains (BXD2/TYJ, NZM2410/J, CAST/EIJ) for four generations in an advanced intercross line. Cellular phenotypes were determined by flow cytometric quantification of splenic leukocytes and complemented by the histopathological evaluation of pancreatic lesions. An Illumina SNP array was used for genotyping. QTL analyses were performed with the R implementation of  HAPPY . Out of 41 leukocyte subpopulations (B cells, T cells and dendritic cells), only three were significantly associated with AIP: While CD4 + /CD44 high  memory T cells and CD4 + /CD69 +  T helper (Th) cells correlated positively with the disease, the cytotoxic T cell phenotype CD8 + /CD44 low  showed a negative correlation. A QTL for AIP on chromosome 2 overlapped with QTLs for CD4 + /CD44 high  and CD8 + /CD44 high  memory T cells, FoxP3 + /CD4 +  and FoxP3 + /CD8 +  regulatory T cells (Tregs), and CD8 + /CD69 +  cytotoxic T cells. On chromosome 6, overlapping QTLs for AIP and CD4 + /IL17 +  Th17 cells and again FoxP3 + /CD8 +  Tregs were observed. In conclusion, CD4 + /CD44 high  memory T cells are the only leukocyte subtype that could be linked to AIP both by correlation studies and from observed overlapping QTL. The potential role of this cell type in the pathogenesis of AIP warrants further investigations.

Quantitative Trait Locus Analysis Implicates CD4+/CD44high Memory T Cells in the Pathogenesis of Murine Autoimmune Pancreatitis