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Updated: May 8, 2026
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Characterization of the Isolated, Ventilated, and Instrumented Mouse Lung Perfused with Pulsatile Flow
Published on: April 29, 2011
Optimization of isolated perfused/ventilated mouse lung to study hypoxic pulmonary vasoconstriction
Hae Young Yoo1, Amy Zeifman, Eun A Ko
1Department of Medicine, Section of Pulmonary, Critical Care, Sleep and Allergy Medicine, University of Illinois at Chicago, Chicago, Illinois, USA.
Pulmonary Circulation
|September 10, 2013
Summary
This study optimized conditions for measuring hypoxic pulmonary vasoconstriction (HPV) in mouse lungs. Persistent HPV requires extracellular calcium (Ca2+), confirming its crucial role in this vital lung function.
Area of Science:
- Physiology
- Pulmonary Circulation
- Cellular Biology
Background:
- Hypoxic pulmonary vasoconstriction (HPV) is a critical lung mechanism for matching ventilation to perfusion.
- Previous studies on HPV have yielded variable results due to differing experimental conditions and species.
- Investigating HPV in a controlled mouse model is essential for understanding its regulation.
Purpose of the Study:
- To establish optimal conditions for measuring HPV in an isolated perfused/ventilated mouse lung model.
- To investigate the role of extracellular calcium (Ca2+), caveolin-1, and endothelial nitric oxide synthase in HPV.
- To compare the efficacy of various perfusate solutions in inducing HPV.
Main Methods:
- Utilized an isolated perfused/ventilated mouse lung model.
- Compared perfusate solutions including PSS with albumin, Ficoll, rat blood, FBS, and DMEM.
- Applied cyclical hypoxic (1% O2) and normoxic (21% O2) ventilation to measure pulmonary arterial pressure (PAP) changes.
- Assessed the impact of extracellular Ca2+ removal and nifedipine on HPV.
Main Results:
- Persistent and repetitive HPV was achieved using physiological salt solution (PSS) with 20% fetal bovine serum (FBS).
- HPV was significantly diminished by removing extracellular Ca2+ and using the Ca2+ channel blocker nifedipine.
- The model demonstrated responsiveness to contractile agents like high K+ and U46619.
Conclusions:
- Optimal conditions for measuring HPV were established in the isolated perfused/ventilated mouse lung.
- Extracellular Ca2+ influx is essential for the development of HPV.
- This model provides a reliable platform for further research into HPV regulation.
