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Published in: Diabetologia 8/2003

01-08-2003 | Article

Pancreatic NOD beta cells express MHC class II protein and the frequency of I-Ag7 mRNA-expressing beta cells strongly increases during progression to autoimmune diabetes

Authors: Dr. U. Walter, T. Toepfer, K. E. J. Dittmar, K. Kretschmer, J. Lauber, S. Weiss, G. Servos, O. Lechner, W. A. Scherbaum, S. R. Bornstein, H. von Boehmer, J. Buer

Published in: Diabetologia | Issue 8/2003

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Abstract

Aims/hypothesis

In the NOD mouse model, attempts to show MHC class II expression by pancreatic beta cells were unsuccessful so far. We readdressed this question by analysing I-Ag7 expression in single pancreatic beta cells.

Methods

Single-cell multiplex RT PCR and single-cell immunofluorescence were used to study MHC class II expression in NOD and NOD/SCID beta cells.

Results

Pancreatic beta cells from NOD mice express the I-Ag7 protein as well as the corresponding mRNA. The frequency of MHC class II mRNA-expressing beta cells is drastically increased during the progression to overt diabetes. MHC class II protein is accumulated intracellularly, and invariant chain is co-expressed. Beta cells from 9- to 10-week-old NOD/SCID mice express MHC class II at the same low frequency as beta cells from 3-week-old NOD mice.

Conclusion/interpretation

NOD beta cells express I-Ag7 and could be a direct target of autoreactive CD4+ T cells. This MHC class II expression is triggered by infiltrating lymphocytes.
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Metadata
Title
Pancreatic NOD beta cells express MHC class II protein and the frequency of I-Ag7 mRNA-expressing beta cells strongly increases during progression to autoimmune diabetes
Authors
Dr. U. Walter
T. Toepfer
K. E. J. Dittmar
K. Kretschmer
J. Lauber
S. Weiss
G. Servos
O. Lechner
W. A. Scherbaum
S. R. Bornstein
H. von Boehmer
J. Buer
Publication date
01-08-2003
Publisher
Springer-Verlag
Published in
Diabetologia / Issue 8/2003
Print ISSN: 0012-186X
Electronic ISSN: 1432-0428
DOI
https://doi.org/10.1007/s00125-003-1164-y

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