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Related Experiment Videos

Interactions between plasma proteins and pulmonary surfactant: pulsating bubble studies.

K M Keough1, C S Parsons, M G Tweeddale

  • 1Department of Biochemistry, Memorial University of Newfoundland, St. John's, Canada.

Canadian Journal of Physiology and Pharmacology
|June 1, 1989
PubMed
Summary

Human proteins like albumin and globulin interfere with porcine pulmonary surfactant function. These proteins hinder surfactant adsorption and surface refinement, impacting lung bubble dynamics and surface tension reduction.

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Area of Science:

  • Pulmonary physiology
  • Biochemistry
  • Surface chemistry

Background:

  • Pulmonary surfactant is crucial for reducing surface tension in the lungs.
  • Proteins in the lungs can interact with and potentially inhibit surfactant function.
  • Understanding these interactions is vital for respiratory health research.

Purpose of the Study:

  • To investigate the effects of human albumin, alpha-globulin, and fibrinogen on porcine pulmonary surfactant.
  • To determine how these proteins influence surfactant adsorption and surface tension reduction.
  • To assess the impact of proteins on the surface refinement process.

Main Methods:

  • Utilized a pulsating bubble surfactometer to measure surfactant activity.
  • Investigated the adsorption of surfactant to the air-water interface in the presence of proteins.

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  • Assessed the ability of surfactant to lower bubble opening pressures during compression cycles.

    • Main Results:

    • All three proteins (albumin, alpha-globulin, fibrinogen) impaired surfactant adsorption to the air-water interface.
    • Proteins reduced surfactant's effectiveness in lowering bubble opening pressures, indicating impaired surface tension reduction.
    • Alpha-globulin competed most strongly with surfactant adsorption; albumin least effectively.
    • Proteins interfered with surface refinement, with albumin being least detrimental and globulin/fibrinogen most detrimental.

    Conclusions:

    • Human plasma proteins significantly inhibit the biophysical functions of pulmonary surfactant.
    • These inhibitory effects are mediated through interference with both adsorption and surface refinement processes.
    • The specific protein composition influences the degree of surfactant dysfunction, with implications for lung mechanics.