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Updated: May 9, 2026
05:47
Generation of Human 3D Lung Tissue Cultures (3D-LTCs) for Disease Modeling
Published on: February 12, 2019
The lung in liver disease: old problem, new concepts
Michael B Fallon1, Junlan Zhang
1Department of Internal Medicine, Division of Gastroenterology, Hepatology & Nutrition, The University of Texas Medical School at Houston, 6431 Fannin Street, MSB 4.234, Houston, Texas 77030, USA. Michael.B.Fallon@uth.tmc.edu
Summary
Hepatopulmonary syndrome (HPS) involves liver dysfunction affecting the lungs, causing hypoxemia in cirrhosis patients. Novel research reveals endothelin-1 and CX3CL1 pathways are key mechanisms driving HPS pathology.
Area of Science:
- Pulmonary Medicine
- Hepatology
- Vascular Biology
Background:
- Liver dysfunction impacts lung function through mechanisms not fully understood.
- Hepatopulmonary syndrome (HPS), a complication of cirrhosis, causes hypoxemia due to pulmonary microvascular dilation.
- HPS affects up to 30% of cirrhosis patients, increasing mortality, with liver transplantation as the only cure.
Purpose of the Study:
- To investigate the mechanisms underlying HPS development in experimental biliary cirrhosis.
- To identify specific molecular pathways involved in HPS-related pulmonary vascular changes and gas exchange abnormalities.
Main Methods:
- Induction of experimental biliary cirrhosis using common bile duct ligation (CBDL) in rats.
- Analysis of pulmonary vascular pathology, including microvascular dilation, monocyte infiltration, and angiogenesis.
- Investigation of the roles of the endothelin-1 (ET-1)/endothelin B (ETB) receptor and CX3CL1/CX3CR1 pathways.
Main Results:
- CBDL-induced cirrhosis in rats replicated the pulmonary vascular and gas exchange abnormalities seen in human HPS.
- Pathologic features in the lung included microvascular dilation, intravascular monocyte infiltration, and angiogenesis.
- Activation and interaction between the ET-1/ETB and CX3CL1/CX3CR1 pathways were identified as critical mechanisms.
Conclusions:
- Biliary epithelium plays a role in HPS pathogenesis.
- The ET-1/ETB and CX3CL1/CX3CR1 signaling pathways are crucial mediators of lung pathology in experimental HPS.
- These findings offer insights into novel therapeutic targets for HPS in cirrhosis.
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