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[Alpha 1 antitrypsin deficiency. Physiopathological consequences].

M P Glauser

    Schweizerische Medizinische Wochenschrift
    |August 2, 1975
    PubMed
    Summary

    Alpha-1-antitrypsin deficiency, a genetic condition, leads to liver protein buildup and lung emphysema. Cigarette smoking significantly worsens lung damage in deficient individuals.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Pulmonology

    Context:

    • Alpha-1-antitrypsin (AAT) is a glycoprotein synthesized in the liver.
    • Genetic variants, like the Z allele, affect AAT levels.
    • AAT deficiency is linked to liver disease and lung emphysema.

    Purpose:

    • To explain the pathophysiology of Alpha-1-antitrypsin deficiency.
    • To highlight the role of AAT in preventing lung tissue destruction.
    • To identify risk factors exacerbating lung damage.

    Summary:

    • Hepatocytes synthesize AAT, but genetic variants (heterozygotic Z allele) reduce blood levels, while homozygotic Z allele causes near absence.
    • Deficiency leads to intracellular AAT accumulation in hepatocytes and emphysematous lung destruction due to lack of anti-protease activity.
    • Population studies reveal cigarette smoking as a significant risk factor, increasing parenchymal destruction probability in individuals with AAT deficiency.

    Impact:

    • Understanding AAT deficiency mechanisms.
    • Identifying individuals at risk for emphysema.
    • Emphasizing smoking cessation for AAT-deficient patients to prevent severe lung disease.

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