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Molecular pathogenesis of alpha-1-antitrypsin deficiency
A Duvoix1, B D Roussel1, D A Lomas1
1Department of Medicine, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Hills Road, Cambridge, CB2 0XY, UK.
Revue Des Maladies Respiratoires
|December 3, 2014
Summary
Alpha-1 antitrypsin (α1-AT) deficiency, caused by the Z allele, leads to liver cirrhosis and emphysema due to protein polymer buildup. Understanding this mechanism offers insights into serpinopathies and potential new therapies.
Area of Science:
- Biochemistry
- Genetics
- Pulmonology
Background:
- Alpha-1 antitrypsin (α1-AT) is the primary circulating protease inhibitor.
- The Z allele (Glu342Lys) causes α1-AT polymerization in hepatocytes, leading to endoplasmic reticulum retention.
- These polymers are implicated in cirrhosis and reduced circulating α1-AT causes emphysema.
Purpose of the Study:
- To review the molecular basis of α1-AT deficiency.
- To explore how liver disease mechanisms inform emphysema pathobiology.
- To discuss therapeutic strategies for α1-AT deficiency and related serpinopathies.
Main Methods:
- Literature review of molecular mechanisms.
- Analysis of pathobiology linking liver and lung disease.
- Examination of current and future therapeutic approaches.
Main Results:
- The Z allele induces ordered α1-AT polymer formation and retention in hepatocytes.
- Understanding liver disease pathogenesis provides insights into emphysema development.
- α1-AT deficiency serves as a model for serpinopathies.
Conclusions:
- The molecular mechanisms of α1-AT deficiency illuminate the pathobiology of associated liver and lung diseases.
- This understanding paves the way for novel therapeutic interventions.
- The study of α1-AT deficiency offers a paradigm for treating a broader class of serpinopathies.
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