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Mapping I-A(g7) restricted epitopes in murine G6PC2.

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Immunologic Research

|September 18, 2012

Summary

Researchers identified new CD4(+) T cell epitopes for islet-specific glucose 6-phosphatase catalytic subunit-related protein (IGRP) in non-obese diabetic mice. These findings suggest IGRP-reactive CD4(+) T cells may play a role in type 1 diabetes development.

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Area of Science:

Immunology
Endocrinology
Autoimmunity

Background:

Islet-specific glucose 6-phosphatase catalytic subunit-related protein (IGRP) is a known target of autoreactive CD8(+) T cells in type 1 diabetes.
The role of IGRP-reactive CD4(+) T cells in diabetogenesis is less understood compared to CD8(+) T cells.

Purpose of the Study:

To investigate potential novel epitopes of IGRP recognized by CD4(+) T cells in non-obese diabetic (NOD) mice.
To determine if these IGRP-reactive CD4(+) T cells are involved in the development of diabetes.

Main Methods:

NOD mice were immunized with recombinant mouse IGRP. CD4(+) T cell recall responses were measured using a library of overlapping peptides covering the entire IGRP sequence.
Proliferation assays were performed, and responses were confirmed using I-A(g7) blocking antibodies. T cells from pancreatic lymph nodes, peripheral lymph nodes, and spleens of pre-diabetic mice were analyzed.

Main Results:

Nine peptides representing 8 novel I-A(g7)-restricted CD4(+) T cell epitopes were identified, with only one overlapping with previously reported epitopes.
Proliferative responses to 4 of these peptides (3 epitopes) were detected in CD4(+) T cells from the pancreatic draining lymph nodes of pre-diabetic NOD mice.
One identified epitope (IGRP(55-72)) is conserved between mice and humans, suggesting potential relevance in human type 1 diabetes.

Conclusions:

This study expands the known repertoire of IGRP-specific CD4(+) T cell epitopes in NOD mice.
The presence of spontaneously reactive CD4(+) T cells in pancreatic lymph nodes suggests their potential involvement in type 1 diabetes pathogenesis.
The conserved epitope warrants further investigation into its role in human HLA-DQ8-restricted T cell responses in diabetic individuals.