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Enhanced trafficking to the pancreatic lymph nodes and auto-antigen presentation capacity distinguishes peritoneal B lymphocytes in non-obese diabetic mice

Alam, C.; Valkonen, S.; Ohls, S.; T�rnqvist, K.; H�nninen, A.

Authors

S. Valkonen

S. Ohls

K. T�rnqvist

A. H�nninen



Abstract

<h4>Aims/hypothesis</h4>NOD.Igmicro ( null ) mice lacking mature B cells are highly resistant to diabetes and display poor CD4 T cell responses to autoantigens. Nevertheless, the degree to which different B cell subsets contribute to diabetes in NOD mice remains unresolved. Due to their role in the recognition of microbial and autoantigens, peritoneal B cell characteristics were examined in NOD mice to see if they differ developmentally, phenotypically or functionally in aspects relevant to diabetogenesis.<h4>Methods</h4>The population dynamics, activation state, migratory behaviour and antigen presentation function were investigated in NOD peritoneal B cells.<h4>Results</h4>NOD peritoneal B cells were found to express abnormally high levels of co-stimulatory molecules (CD40, CD86 and CD69). In contrast, the expression of L-selectin and integrin alpha4beta1 was markedly reduced in NOD mice compared with BALB/c and C57BL/6 mice. The number of B cells in the peritoneum was lower in NOD than in control mice throughout development; migration of B cells from the peritoneum to the pancreatic lymph nodes in NOD mice was enhanced tenfold. NOD B cells showed no chemotactic response to sphingosine-1-phosphate, which normally acts to retain B cells in the peritoneum. Peritoneal B cells of NOD mice also presented insulin autoantigen to CD4 T cells, inducing T cell proliferation.<h4>Conclusions/interpretation</h4>NOD peritoneal B cells are hyperactivated, migrate to the pancreatic lymph nodes and are capable of driving insulin-specific CD4 T cell activation. These characteristics could make them important for inducing or amplifying T cell responses against islet-antigens.

Journal Article Type Article
Acceptance Date Oct 23, 2009
Online Publication Date Nov 22, 2009
Publication Date 2010
Deposit Date May 26, 2022
Journal Diabetologia
Print ISSN 0012-186X
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 53
Pages 346-355
DOI https://doi.org/10.1007/s00125-009-1599-x
Public URL http://researchrepository.napier.ac.uk/Output/2870005