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Removal and Replacement of Endogenous Ligands from Lipid-Bound Proteins and Allergens
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Loading Proteins into Extracellular Vesicles to Camouflage Protein Allergens
Estella Rao1, Angela Paterna1, Valeria Longo2
1Institute of Biophysics, National Research Council of Italy, via Ugo La Malfa 153, Palermo 90146, Italy.
ACS Omega
|September 22, 2025
Summary
Microalgal-derived extracellular vesicles (nanoalgosomes) efficiently load large proteins like allergens. This camouflage method for nanoalgosomes offers a novel approach for controlled allergy treatment delivery.
Area of Science:
- Biotechnology
- Nanomedicine
- Allergy Research
Background:
- Extracellular vesicles (EVs) are promising drug delivery systems.
- Loading large macromolecules like proteins into EVs remains a challenge.
- Nanoalgosomes are biocompatible EVs derived from microalgae.
Purpose of the Study:
- To develop an efficient method for loading large proteins into nanoalgosomes.
- To investigate the potential of nanoalgosomes for allergen delivery.
- To demonstrate the camouflage and controlled release of loaded proteins.
Main Methods:
- Extrusion for loading recombinant calcium-binding protein (Par j 4) into nanoalgosomes.
- Affinity chromatography for purification.
- Fluorescence spectroscopy for quantification.
- Confocal microscopy for colocalization studies.
- Dot blot assay to confirm protein masking by intact EVs.
Main Results:
- An efficient method for loading Par j 4 into nanoalgosomes was established.
- Confocal microscopy confirmed protein and EV colocalization.
- Loaded Par j 4 was masked within intact nanoalgosomes, detectable only after lysis.
- Nanoalgosomes demonstrated efficient carriage of large macromolecules.
Conclusions:
- Nanoalgosomes can be effectively loaded with large macromolecules like allergens.
- The camouflage of allergens within nanoalgosomes presents a novel strategy for allergy treatment.
- This approach offers a controlled, side-effect-free method for allergen presentation.
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