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Avidity-dependent programming of autoreactive T cells in T1D
Ivana Durinovic-Belló1, Vivian H Gersuk1, Chester Ni1
1Benaroya Research Institute at Virginia Mason, Seattle, Washington, United States of America.
Plos One
|May 22, 2014
Summary
Type 1 diabetes (T1D) involves autoreactive T cells influenced by insulin gene variations. Specific gene pathways, like NR4A, dictate T cell fate based on signal strength, potentially leading to autoimmunity.
Area of Science:
- Immunology
- Endocrinology
- Genetics
Background:
- Autoreactive T cell fate is determined by avidity-dependent interactions during T cell selection.
- Genetic variations in insulin (INS) influence proinsulin expression in the thymus, impacting T cell development in type 1 diabetes (T1D).
Purpose of the Study:
- To investigate the transcriptional signatures of autoreactive T cells in T1D.
- To understand the role of INS genotypes in T cell selection and autoimmunity development.
Main Methods:
- Purification of proinsulin-specific T cells using HLA class II tetramers.
- Determination of transcriptional signatures in T cells from individuals with different INS genotypes.
Main Results:
- Upregulation of NR4A and early growth response genes was observed in proinsulin-specific T cells from individuals with susceptible INS-VNTR genotypes.
- NR4A genes translate T cell receptor (TCR) signal strength, guiding T cell fate decisions.
- Maintenance of NR4A-guided programs in low-avidity autoreactive T cells suggests a pathway permissive for T1D autoimmunity.
Conclusions:
- Avidity-dependent T cell selection, influenced by INS genotypes, plays a critical role in T1D pathogenesis.
- NR4A gene family acts as a key regulator of T cell fate in response to TCR signaling strength.
- The study identifies a potential mechanism linking T cell development, gene regulation, and autoimmunity in T1D.