Size exclusion chromatography: An efficient tool for hsEV isolation from insect Haemolymph

Area of Science:

• Biotechnology and Biomolecular Engineering
• Immunology and Infectious Diseases
• Insect Science and Entomology

Background:

• Extracellular vesicles (EVs) are crucial intercellular communicators influencing cell phenotype and function, with applications in vaccines and disease modulation.
• Insect hemolymph contains antimicrobial peptides (AMPs) that form a potent defense system against pathogens.
• The potential of insect-derived EVs as natural cargo transporters for therapeutic molecules remains largely unexplored.

Purpose of the Study:

• To establish a methodology for isolating hemolymph-derived small extracellular vesicles (hsEVs) from insects.
• To characterize the isolated hsEVs and investigate their potential antibacterial properties.

Main Methods:

• Isolation of hsEVs from insect hemolymph using size exclusion chromatography.
• Molecular and physical characterization of hsEVs via Western blotting (anti-CD63, anti-Flotillin-2), Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microscopy (FESEM), confocal microscopy, and Dynamic Light Scattering (DLS).
• Assessment of antibacterial activity by measuring bacterial growth inhibition.

Main Results:

• Successful isolation and purification of hsEVs from insect hemolymph.
• Comprehensive molecular and physical characterization confirming the identity and properties of hsEVs.
• Demonstration of antibacterial properties of the isolated hsEVs.

Conclusions:

• This study defines a robust methodology for hsEV isolation and characterization from an insect model system.
• Insect-derived hsEVs effectively encapsulate antimicrobial peptides, acting as natural nanocarriers.
• The findings highlight the potential of hsEVs as a novel platform for developing antimicrobial therapeutics.