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Molecular mimicry and autoimmune liver disease: virtuous intentions, malign consequences
D P Bogdanos1, K Choudhuri, D Vergani
1Immunology Group, Institute of Hepatology, University College London Medical School, London, UK.
Abstract:
The pathogenesis of autoimmune liver disease and autoimmunity associated with chronic viral hepatitis remains poorly understood. One of the major hurdles to a deeper understanding of these pathological processes is the absence of clearly defined inductive mechanisms, which, if identified and characterised, could guide clinical strategies for their prevention or allow therapeutic intervention. Molecular mimicry leading to crossreactive autoimmune responses has gained strong experimental support in the past decade. A fundamental premise of this hypothesis is the involvement of a mimicking environmental trigger. In view of the numerous viral and bacterial agents epidemiologically linked to autoimmune liver diseases, we and others have proposed molecular mimicry to be an important mechanism in these diseases. We also propose similar crossreactive mechanisms to operate in the generation of autoimmunity in viral hepatitis. This review focuses on molecular mimicry at the level of the B-cell, as few data on T-cell crossreactivity in liver disease are thus far available.
Insights
Molecular mimicry may explain autoimmune liver diseases and viral hepatitis autoimmunity. Identifying environmental triggers is key for prevention and treatment strategies targeting B-cell responses.
Area of Science:
- Hepatology
- Immunology
- Molecular Biology
Background:
- The mechanisms driving autoimmune liver disease and viral hepatitis-associated autoimmunity are not fully understood.
- Lack of defined inductive mechanisms hinders the development of preventive or therapeutic clinical strategies.
Purpose of the Study:
- To review the role of molecular mimicry in the pathogenesis of autoimmune liver diseases.
- To explore molecular mimicry as a potential mechanism for autoimmunity in chronic viral hepatitis.
- To focus on B-cell mediated molecular mimicry due to limited data on T-cell crossreactivity.
Main Methods:
- Literature review focusing on molecular mimicry.
- Analysis of epidemiological links between environmental agents and autoimmune liver diseases.
- Examination of B-cell crossreactivity in the context of liver autoimmunity.
Main Results:
- Molecular mimicry hypothesis is supported by experimental evidence.
- Environmental triggers are proposed to initiate crossreactive autoimmune responses.
- Evidence suggests molecular mimicry plays a role in both autoimmune liver disease and viral hepatitis.
Conclusions:
- Molecular mimicry is a significant proposed mechanism for autoimmune liver disease and viral hepatitis autoimmunity.
- Identifying environmental triggers is crucial for understanding and potentially intervening in these conditions.
- Further research into T-cell crossreactivity is needed alongside the focus on B-cell mechanisms.