Monitoring Extracellular Vesicle Cargo Active Uptake by Imaging Flow Cytometry

Area of Science:

• Cell Biology
• Immunology
• Parasitology

Background:

• Extracellular vesicles mediate intercellular communication by transporting proteins, lipids, and nucleic acids.
• Pathogens like Plasmodium falciparum (Pf) utilize vesicle release to manipulate host responses.
• Tools are needed to study host-pathogen interactions involving extracellular vesicles.

Purpose of the Study:

• To develop and validate an imaging flow cytometry (IFC) method for monitoring the uptake of malaria-derived vesicles by host immune cells.
• To track the internalization kinetics and delivery of cargo from malaria vesicles.
• To investigate the impact of parasitic cargo on host cell dynamics.

Main Methods:

• Development of an imaging flow cytometry (IFC) assay.
• Staining of extracellular vesicle cargo components for tracking.
• Monitoring of cargo internalization and cellular responses over time.
• Specific observation of Plasmodium falciparum (Pf)-DNA cargo effects.

Main Results:

• The IFC method successfully monitors malaria-derived vesicle uptake by host immune cells.
• Internalization kinetics and cargo delivery were quantitatively measured.
• Uptake of Pf-DNA cargo was shown to induce translocation of transcription factor IRF3 from the cytosol to the nucleus in recipient immune cells.
• The method allows visualization of specific molecular events following vesicle internalization.

Conclusions:

• The developed IFC method is a valuable research tool for studying host-pathogen interactions mediated by extracellular vesicles.
• This technique enables detailed analysis of cellular dynamics and host response mechanisms.
• The findings highlight a specific pathway by which malaria parasitic DNA influences host immune cells.