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Related Experiment Videos

Cationic proteins induce airway hyperresponsiveness dependent on charge interactions

A J Coyle1, S J Ackerman, C G Irvin

  • 1Department of Medicine, University of Colorado Health Science Center, Denver.

The American Review of Respiratory Disease
|April 1, 1993
PubMed
Summary

Charge interactions involving cationic proteins like major basic protein (MBP) can increase airway hyperresponsiveness (AHR). Neutralizing protein charge with heparin or other anions inhibits this AHR, highlighting the role of charge in airway responses.

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Area of Science:

  • Pulmonary immunology
  • Airway physiology
  • Biochemistry

Background:

  • Human eosinophil-derived major basic protein (MBP) increases airway responsiveness in rats.
  • Synthetic polycations mimic this effect, suggesting charge interactions are key in airway hyperresponsiveness (AHR).

Purpose of the Study:

  • Investigate if other cationic proteins (platelet factor 4, cathepsin G) induce AHR.
  • Determine if AHR induction by cationic proteins depends on positive charge.
  • Examine if heparin or other anions inhibit polycation-induced AHR.

Main Methods:

  • Intratracheal administration of cationic proteins (MBP, PF4, cathepsin G) or poly-L-lysine in rats.
  • Assessment of airway responsiveness via methacholine challenge.
  • Neutralization of protein charge using low molecular weight heparin, albumin, or dextran sulphate.

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Main Results:

  • MBP, PF4, and cathepsin G increased airway responsiveness 2- to 3-fold.
  • Low molecular weight heparin inhibited AHR induced by native cationic proteins.
  • Poly-L-lysine-induced AHR was inhibited by low molecular weight heparin, albumin, and dextran sulphate.

Conclusions:

  • Charge interactions are crucial for airway hyperresponsiveness induced by eosinophil-derived MBP.
  • Charge interactions also underlie altered airway responsiveness caused by other cationic proteins.
  • Further research is needed to elucidate the precise mechanisms involved.