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Autophagy in Hepatocytes in Infants With Alpha-1 ATD and Different Liver Disease Outcomes: A Retrospective Analysis

Elżbieta Czarnowska1, Agnieszka Bakuła, Joanna B Bierła

  • 1*Department of Pathology †Department of Gastroenterology, Hepatology Nutrition Disorders and Paediatrics, The Children's Memorial Health Institute ‡Department of Histology and Embryology, Medical University of Warsaw, Warsaw, Poland.

Journal of Pediatric Gastroenterology and Nutrition
|January 4, 2017
PubMed

Insights

Infants with Alpha-1-Antitrypsin Deficiency (α1ATD) and unfavorable liver outcomes show low Parkin expression and mitochondrial abnormalities in infancy. These findings may predict poor liver disease prognosis in α1ATD patients.

Area of Science:

  • Hepatology
  • Genetics
  • Cell Biology

Background:

  • Alpha-1-Antitrypsin Deficiency (α1ATD) is a genetic disorder.
  • The PiZZ phenotype (ATZ) is the most common and severe form of α1ATD.
  • Liver disease is a major complication of ATZ, but early predictors are lacking.

Purpose of the Study:

  • To investigate liver-specific pathways for antitrypsin (AT) protein disposal in infants with ATZ.
  • To determine if early cellular changes in infancy are associated with unfavorable liver outcomes in ATZ.

Main Methods:

  • Liver samples from infants with ATZ (unfavorable and good outcomes) and biliary atresia (control) were analyzed.
  • Autophagy activity was assessed via mRNA and protein expression (Calnexin, Beclin-1, p62, Parkin).
  • Hepatocyte ultrastructure was examined using morphometric analyses.

Main Results:

  • No significant differences in liver gene expression were found between ATZ groups.
  • Parkin immunohistochemical expression differed between ATZ groups, with lower expression in unfavorable outcomes.
  • Hepatocytes in infants with unfavorable ATZ outcomes showed low Parkin, isolated mitophagosomes, and enlarged mitochondria.

Conclusions:

  • Specific infant cellular features, including low Parkin expression, may indicate a predisposition to poor liver outcomes in ATZ.
  • Low Parkin expression could serve as a prognostic marker for liver disease in α1ATD.
  • Further research with larger cohorts is necessary to validate these findings for disease prognosis and treatment.
Abstract

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