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Related Experiment Video

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Murine Precision-Cut Liver Slices as an Ex Vivo Model of Liver Biology
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Alpha-1 Antitrypsin Inclusions Sequester GRP78 in a Bile Acid-Inducible Manner.

Igor Spivak1, Nurdan Guldiken1, Valentyn Usachov1

  • 1Medical Department III, Gastroenterology, Metabolic Diseases and Intensive Care, University Hospital RWTH Aachen, Aachen, Germany.

Liver International : Official Journal of the International Association for the Study of the Liver
|December 12, 2024
PubMed
Summary

Alpha-1 antitrypsin (AAT) deficiency causes liver disease through AAT aggregation. This study found GRP78 protein within these aggregates, and bile acids worsen AAT liver damage.

Keywords:
ER chaperonecholestatic liver injurygenetic liver diseaserare liver diseaseα‐1 antitrypsin deficiency

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Area of Science:

  • Hepatology
  • Molecular Biology
  • Biochemistry

Background:

  • Severe alpha-1 antitrypsin (AAT) deficiency (PIZZ genotype) is a primary cause of liver disease.
  • Liver damage results from hepatocellular AAT aggregation.
  • The composition of these aggregates and the role of bile acids are not fully understood.

Purpose of the Study:

  • To analyze the composition of AAT aggregates.
  • To investigate the impact of bile acids on AAT aggregation and liver disease progression.

Main Methods:

  • AAT inclusions were isolated from mouse and human livers using fluorescence-activated and immunomagnetic sorting (FACS/MACS).
  • Protein composition was analyzed by mass spectrometry, immunoblotting, and immunostaining.
  • Serum bile acids were measured in PIZZ subjects and controls, and mice were fed a cholic acid (CA)-supplemented diet.

Main Results:

  • Mass spectrometry identified GRP78 (78 kDa glucose-regulated protein) within AAT aggregates.
  • GRP78 levels were elevated in hepatocytes with AAT aggregates and in insoluble fractions from PiZ mice and PIZZ human livers.
  • PIZZ subjects with liver disease had higher serum bile acid levels; CA administration increased liver injury and GRP78 translocation into aggregates in mice.

Conclusions:

  • GRP78 is sequestered within AAT inclusions in the liver.
  • Bile acid accumulation, prevalent in PIZZ subjects with liver disease, may enhance GRP78 sequestration and exacerbate liver damage.