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Related Concept Videos

Cirrhosis I: Introduction01:23

Cirrhosis I: Introduction

32
Cirrhosis is a chronic, irreversible liver disease characterized by the widespread replacement of healthy liver tissue with fibrotic scar tissue and the formation of regenerative nodules.Etiology of cirrhosisCirrhosis results from sustained liver injury that triggers progressive fibrosis and structural remodeling. The underlying causes are diverse, encompassing common and less frequent clinical conditions. Regardless of the origin, all causes lead to chronic inflammation, hepatocyte loss, and...
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Cirrhosis II: Pathophysiology01:24

Cirrhosis II: Pathophysiology

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Cirrhosis is a progressive chronic liver injury caused by prolonged inflammation, excessive fibrotic remodeling, and impaired regeneration. Over time, repeated hepatic insults disrupt the liver’s architecture and function, leading to reduced blood flow, impaired bile drainage, and diminished metabolic capacity.Pathophysiology of cirrhosisCirrhosis arises from three main responses to chronic liver damage: inflammation, immune activation, and hepatocyte death. These processes lead to...
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Related Experiment Video

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Glutamine Flux Imaging Using Genetically Encoded Sensors
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Glutamine synthetase staining patterns in cirrhosis.

Eric D Nguyen1, Chien-Kuang Cornelia Ding1, Sarah E Umetsu1

  • 1Department of Pathology, University of California, San Francisco, CA, United States.

Human Pathology
|September 8, 2024
PubMed
Summary

Glutamine synthetase (GS) staining in the periportal area of the liver is common in both regressed and progressive cirrhosis. While GS patterns vary, they are less effective than traditional stains for distinguishing regressed from non-regressed cases.

Keywords:
CirrhosisFibrosisGlutamine synthetaseProgressionRegression

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Area of Science:

  • Hepatology
  • Pathology
  • Immunohistochemistry

Background:

  • Advanced liver fibrosis can potentially regress after addressing the underlying cause.
  • Glutamine synthetase (GS) expression typically occurs in centrizonal hepatocytes but can shift to the periportal region in regressed cirrhosis.
  • Understanding GS staining patterns may offer insights into liver disease progression and regression.

Purpose of the Study:

  • To investigate the spectrum of Glutamine Synthetase (GS) staining patterns in cirrhotic livers.
  • To identify and characterize periportal GS staining in various stages and etiologies of liver fibrosis.
  • To evaluate the utility of GS staining in differentiating regressed from non-regressed cirrhotic cases.

Main Methods:

  • Review of 88 liver resection/explant specimens with advanced fibrosis.
  • Hematoxylin and eosin (H&E) and GS immunohistochemical staining.
  • Trichrome and orcein stains used for classification into progressive, indeterminate, or regressive categories.

Main Results:

  • Periportal GS staining was observed in 97% of regressive and 84% of progressive/indeterminate cases.
  • Diverse GS staining patterns were identified, including perivenular, periseptal, and perinodular.
  • The GS periseptal pattern was more frequent in regressed cirrhosis; perinodular staining was associated with cholestasis in 75% of cases.

Conclusions:

  • Periportal GS staining is a common finding across different patterns of cirrhosis.
  • GS immunohistochemistry, while showing varied patterns, is less reliable than orcein/trichrome staining for distinguishing regressed from non-regressed cirrhosis.