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α(1)-antitrypsin deficiency and inflammation.

Ugo I Ekeowa1, Stefan J Marciniak, David A Lomas

  • 1Department of Medicine, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Cambridge, CB2 0XY, UK.

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Alpha-1 antitrypsin deficiency, caused by SERPINA1 gene mutations, leads to protein misfolding and accumulation. This results in liver disease and early-onset emphysema, prompting new therapeutic strategies.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Hepatology

Background:

  • Alpha-1 antitrypsin (AAT) deficiency is an autosomal recessive disorder.
  • Point mutations in the SERPINA1 gene, particularly the Z mutation (Glu342Lys), are the primary cause.
  • Misfolded AAT protein forms polymers, accumulating in hepatocytes and leading to characteristic inclusions.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying AAT deficiency.
  • To understand the pathogenesis of liver disease and emphysema associated with AAT deficiency.
  • To explore potential therapeutic targets for AAT deficiency.

Main Methods:

  • Analysis of SERPINA1 gene mutations.
  • Investigation of protein misfolding and polymer formation.
  • Study of cellular accumulation and extracellular effects of AAT polymers.

Main Results:

  • The Z mutation causes AAT misfolding into ordered polymers, accumulating in the endoplasmic reticulum of hepatocytes.
  • These polymers form periodic acid-Schiff positive inclusions, linked to neonatal hepatitis, cirrhosis, and hepatocellular carcinoma.
  • Lack of circulating AAT leads to uncontrolled proteolysis, predisposing to early-onset emphysema.

Conclusions:

  • AAT polymer formation in hepatocytes and extracellular tissues drives disease pathogenesis.
  • Understanding these mechanisms is crucial for developing targeted therapies.
  • Therapeutic strategies aim to prevent aberrant conformational transitions of mutant AAT.