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Infectious triggers in type 1 diabetes: is there a case for epitope mimicry?
Diabetes, Obesity & Metabolism
|September 6, 2013
Summary
Environmental factors contribute to type 1 diabetes (T1D) pathogenesis, but triggers remain unknown. While enteroviruses are suspected, evidence for their causal role is limited, necessitating further research into other infectious agents.
Area of Science:
- Immunology
- Virology
- Endocrinology
Background:
- Environmental factors are key to type 1 diabetes (T1D) pathogenesis, but specific triggers are unidentified.
- Enteroviruses are candidates due to temporal links with T1D autoimmunity and presence in islets, but evidence is not universal.
- Existing evidence for enteroviruses causing T1D is inconclusive, with conflicting results in animal models.
Purpose of the Study:
- To evaluate the role of enteroviruses as triggers for type 1 diabetes (T1D).
- To assess proposed mechanisms, including non-antigen-specific and antigen-specific pathways like epitope mimicry.
- To highlight the need for fulfilling Koch's postulates and developing better models for T1D research.
Main Methods:
- Review of existing literature on enterovirus infections and T1D.
- Analysis of proposed pathogenic mechanisms (non-antigen-specific and antigen-specific).
- Discussion of criteria for establishing causality (Koch's postulates) and the need for advanced models.
Main Results:
- Temporal correlations and viral protein detection in islets suggest a possible link for enteroviruses.
- Evidence for a causal relationship is lacking; enterovirus infection in mice can either trigger or prevent T1D.
- Proposed mechanisms, especially epitope mimicry, lack strong supporting evidence at the single T-cell level.
Conclusions:
- The role of enteroviruses as a universal trigger for type 1 diabetes (T1D) is not definitively established.
- Other infectious agents may be involved in T1D pathogenesis.
- Fulfilling Koch's postulates and utilizing humanized mouse models are crucial for identifying T1D triggers.
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