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Heterozygous MZ alpha-1-antitrypsin deficiency in adults with chronic liver disease
H Bell1, E Schrumpf, M K Fagerhol
1Dept. of Medicine, Aker University Hospital, Oslo, Norway.
Abstract:
Pi phenotype was determined in 335 patients with liver diseases and compared with the results in 2830 healthy blood donors. Eleven of 335 patients had phenotype MZ (3.3%, compared with 2.9% in healthy blood donors (NS]. None of 53 patients with autoimmune chronic active hepatitis had the MZ phenotype, but it was found in 2 of 18 patients (11.1%) with cryptogenic cirrhosis, 3 of 78 (3.8%) with alcoholic liver cirrhosis, 2 of 36 (5.6%) with primary sclerosing cholangitis, and 1 of 26 (3.9%) with primary biliary cirrhosis. Altogether, 3 of 335 patients were homozygous for Pi ZZ and had cirrhosis. One of them (a male) developed a hepatoma and died. We conclude that the reported association between Pi MZ phenotype and chronic non-B active hepatitis does not seem to include patients with autoimmune chronic active hepatitis, whereas the possibility of an association between cryptogenic cirrhosis and the MZ phenotype cannot be excluded.
Insights
The Pi MZ phenotype was not associated with autoimmune liver diseases but may be linked to cryptogenic cirrhosis. Further research is needed to confirm this association in liver disease patients.
Area of Science:
- Hepatology
- Immunology
- Genetics
Background:
- The alpha-1-antitrypsin (AAT) protein, encoded by the Pi gene, plays a crucial role in protecting the lungs and liver from inflammatory damage.
- Specific Pi phenotypes, such as MZ and ZZ, have been investigated for their potential association with various liver diseases.
Purpose of the Study:
- To investigate the prevalence of the Pi MZ phenotype in patients with different types of liver diseases.
- To compare the frequency of the Pi MZ phenotype in liver disease patients with that of healthy blood donors.
- To explore potential associations between specific Pi phenotypes and the risk or progression of liver diseases, including cirrhosis and autoimmune conditions.
Main Methods:
- Phenotyping for alpha-1-antitrypsin (Pi) was performed on 335 patients diagnosed with various liver diseases.
- The prevalence of the Pi MZ phenotype in the patient cohort was compared to that of 2830 healthy blood donors.
- Pi phenotype data was analyzed in subgroups of patients with autoimmune chronic active hepatitis, cryptogenic cirrhosis, alcoholic liver cirrhosis, primary sclerosing cholangitis, and primary biliary cirrhosis.
Main Results:
- The Pi MZ phenotype was observed in 3.3% of liver disease patients, which was not significantly different from the 2.9% observed in healthy controls.
- None of the patients with autoimmune chronic active hepatitis exhibited the Pi MZ phenotype.
- The Pi MZ phenotype was found in a higher proportion of patients with cryptogenic cirrhosis (11.1%) compared to other liver disease subtypes, suggesting a potential association.
Conclusions:
- The study suggests that the Pi MZ phenotype is not associated with autoimmune chronic active hepatitis.
- A potential association between the Pi MZ phenotype and cryptogenic cirrhosis warrants further investigation.
- The homozygous Pi ZZ phenotype was identified in three patients with cirrhosis, with one developing hepatoma, highlighting the severe implications of this genotype in liver disease.