Cargo and cell-specific differences in extracellular vesicle populations identified by multiplexed immunofluorescent...

Area of Science:

• Biochemistry
• Cell Biology
• Biotechnology

Background:

• Extracellular vesicles (EVs) play roles in biological processes and disease pathogenesis.
• Current EV characterization methods often overlook population heterogeneity and require large sample sizes.
• EVs are promising biomarkers for disease diagnosis in humans and animals.

Purpose of the Study:

• To develop and validate an imaging-based method for multiplexed, single-EV analysis.
• To characterize EV heterogeneity regarding canonical markers and cargo.
• To investigate EV glycan content changes in response to cellular pathway modulation.

Main Methods:

• Centrifugation of EVs directly onto cover slips for direct imaging.
• Multiplexed fluorescent microscopy for single-EV characterization.
• Lectin binding assays to assess EV glycan profiles.

Main Results:

• Canonical EV markers are found on distinct EV subsets, varying by producer cell and cargo.
• EVs containing different HIV-1 proteins exhibit specific marker profiles.
• Pharmacological modulation of secretory autophagy alters EV glycan content.

Conclusions:

• Multiplexed imaging analysis reveals specific EV population differences.
• This method enhances understanding of EV biogenesis and facilitates targeted EV subset interrogation.
• The approach offers a powerful tool for analyzing complex EV populations in biological samples.