Uptake, functionality, and re-release of extracellular vesicle-encapsulated cargo

Area of Science:

• Cell biology
• Biotechnology
• Drug delivery

Background:

• Extracellular vesicles (EVs) are crucial intercellular communicators, carrying diverse molecular cargo.
• Their potential as therapeutic delivery vectors is significant, but cargo delivery efficiency needs optimization.
• Understanding EV fate within recipient cells is vital for harnessing their therapeutic capabilities.

Purpose of the Study:

• To demonstrate functional delivery of EV-encapsulated cargo using advanced reporter systems.
• To elucidate mechanisms governing the fate of internalized EVs within recipient cells.
• To identify strategies for enhancing the therapeutic efficacy of EV-mediated delivery.

Main Methods:

• Utilized organelle-targeted nanoluciferase and fluorescent proteins to track EV cargo.
• Combined luminescence and fluorescence reporters for comprehensive cargo monitoring.
• Investigated EV uptake, intracellular trafficking, and release dynamics in recipient cells.

Main Results:

• Demonstrated successful functional delivery of RNA and protein cargo encapsulated within EVs.
• Identified a mechanism of prolonged cargo retention within the endosomal compartment, leading to degradation.
• Discovered a novel pathway for the intact re-release of internalized EVs by recipient cells.
• Highlighted critical factors influencing cargo delivery and EV fate within recipient cells.

Conclusions:

• EVs can deliver functional cargo, but intracellular trafficking and degradation pose challenges.
• Recipient cells exhibit distinct fates for internalized EVs, including prolonged retention and intact re-release.
• Understanding these EV fates is essential for developing efficient EV-based therapeutic strategies.
• This study provides insights to optimize EV-mediated delivery for enhanced therapeutic outcomes.