Nitric oxide-releasing alginates as mucolytic agents

Area of Science:

• Biomaterials Science
• Respiratory Medicine
• Rheology

Background:

• Severe respiratory diseases involve excessive, thick mucus obstructing airways and promoting bacterial infections.
• Current mucolytic agents have limitations in treating mucus-related complications.

Purpose of the Study:

• To evaluate the impact of nitric oxide (NO)-releasing alginates on the viscoelastic properties of human bronchial epithelial (HBE) mucus.
• To determine the optimal NO release kinetics and concentration for effective mucus thinning.

Main Methods:

• Parallel plate rheology was used to measure changes in mucus elasticity and viscosity.
• The study compared various NO-releasing alginates with different release profiles to NO-releasing chitosan and N-acetyl cysteine (NAC).

Main Results:

• Low molecular weight alginates (~5 kDa) with high NO flux and sustained release (half-life ~0.3 h) significantly reduced mucus elasticity and viscosity (≥60%).
• The efficacy of NO-releasing alginates was dose-dependent, with higher concentrations yielding greater reductions.
• NO-releasing alginates demonstrated superior mucolytic effects compared to NO-releasing chitosan and NAC, even at lower concentrations.

Conclusions:

• NO-releasing alginates, particularly low molecular weight variants with sustained release, represent a promising therapeutic strategy for managing mucus hypersecretion in respiratory diseases.
• These novel biomaterials offer a potentially more effective alternative to conventional mucolytic agents for improving airway clearance.