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2016 ; 213
(6
): 967-78
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Class-switched anti-insulin antibodies originate from unconventional antigen
presentation in multiple lymphoid sites
#MMPMID27139492
Wan X
; Thomas JW
; Unanue ER
J Exp Med
2016[May]; 213
(6
): 967-78
PMID27139492
show ga
Autoantibodies to insulin are a harbinger of autoimmunity in type 1 diabetes in
humans and in non-obese diabetic mice. To understand the genesis of these
autoantibodies, we investigated the interactions of insulin-specific T and B
lymphocytes using T cell and B cell receptor transgenic mice. We found
spontaneous anti-insulin germinal center (GC) formation throughout lymphoid
tissues with GC B cells binding insulin. Moreover, because of the nature of the
insulin epitope recognized by the T cells, it was evident that GC B cells
presented a broader repertoire of insulin epitopes. Such broader recognition was
reproduced by activating naive B cells ex vivo with a combination of CD40 ligand
and interleukin 4. Thus, insulin immunoreactivity extends beyond the pancreatic
lymph node-islets of Langerhans axis and indicates that circulating insulin,
despite its very low levels, can have an influence on diabetogenesis.
|Animals
[MESH]
|Antigen Presentation/genetics/*immunology
[MESH]
|B-Lymphocytes/*immunology/pathology
[MESH]
|CD40 Antigens/genetics/immunology
[MESH]
|Diabetes Mellitus, Type 1/genetics/*immunology/pathology
[MESH]
|Germinal Center/*immunology/pathology
[MESH]
|Immunoglobulin Class Switching/genetics/*immunology
[MESH]