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Identification of pediatric activated T-cell hepatitis using clinical immune studies

Catherine A Chapin1, Tamir Diamond2, Adriana Perez3

  • 1Department of Pediatrics, Northwestern University, Feinberg School of Medicine, Chicago, IL, USA; Division of Gastroenterology, Hepatology and Nutrition, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA.

Clinics and Research in Hepatology and Gastroenterology
|June 27, 2024
PubMed

Insights

Pediatric acute liver failure (PALF) often results from activated T-cell hepatitis (TCHep). Clinical immune labs can identify TCHep, offering a non-invasive tool for early detection before liver failure progresses.

Area of Science:

  • Pediatric Hepatology
  • Immunology
  • Clinical Diagnostics

Background:

  • Pediatric acute liver failure (PALF) is frequently linked to immune dysregulation, specifically activated T-cell hepatitis (TCHep).
  • Distinguishing TCHep from other causes of acute hepatitis in children is crucial for appropriate management.

Purpose of the Study:

  • To characterize a cohort of children with acute severe hepatitis and PALF.
  • To determine if clinical immune laboratory tests can help identify TCHep.

Main Methods:

  • Retrospective review of 124 children with acute hepatitis and PALF (March 2020 - August 2022).
  • Patients were categorized into known diagnoses, indeterminate hepatitis (IND-Hep), or TCHep groups.
  • TCHep was defined by liver biopsy findings or development of aplastic anemia.

Main Results:

  • TCHep patients (n=16) showed significantly higher total bilirubin, soluble interleukin-2 receptor levels, and CD8+ T-cell cytotoxic markers (perforin, granzyme) compared to IND-Hep patients (n=25).
  • Clinical flow cytometry revealed increased CD8+ T cells and activated HLA-DR+ cells in TCHep patients.
  • These immune markers indicate heightened CD8+ T-cell activation and cytotoxic function in TCHep.

Conclusions:

  • Peripheral blood immune studies reveal elevated markers of CD8+ T-cell activation, proliferation, and cytotoxic function in TCHep.
  • Readily available immune function tests can aid in differentiating TCHep from other causes of acute hepatitis.
  • These non-invasive lab tests offer a tool for early TCHep detection, potentially preventing progression to liver failure.
Abstract

Keywords:
Acute hepatitisAplastic anemiaImmune dysregulationPediatric acute liver failure

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