Biologically active lipid A antagonist embedded in a multilayered polyelectrolyte architecture

Area of Science:

• Biomaterials Science
• Immunology
• Nanotechnology

Background:

• Layer-by-layer (LbL) films can incorporate bioactive molecules.
• Beta-cyclodextrins (CDs) can act as molecular chaperones and bind lipopolysaccharides (LPS).
• Previous work demonstrated LPS biological activity within LbL films containing CDs.

Purpose of the Study:

• To develop novel architectures with local endotoxin antagonistic activity.
• To create complexes of charged beta-cyclodextrins (CDs) and lipid A antagonists (LAAs).
• To evaluate the biological activity and stability of these CD-LAA complexes within polyelectrolyte films.

Main Methods:

• Fabrication of multilayered polyelectrolyte films using poly(l-lysine) and poly(l-glutamic acid).
• Incorporation of a complex between a charged beta-cyclodextrin and a lipid A antagonist.
• Assessment of the lipopolysaccharide (LPS) antagonistic activity of the developed architectures on murine and human macrophages.

Main Results:

• The CD-LAA complex, whether adsorbed on top or embedded within the films, retained its LPS antagonistic properties.
• The endotoxin antagonistic activity was sustained for at least 24 hours.
• The developed architectures demonstrated efficacy against both murine and human macrophages.

Conclusions:

• Innovative architectures incorporating CD-LAA complexes show promise for local endotoxin antagonism.
• These systems maintain their biological activity over a significant period.
• The study highlights the potential of functionalized nanomaterials in modulating inflammatory responses.