Cell-based glycoengineering of extracellular vesicles through precise genome editing

Area of Science:

• Biotechnology
• Cell Biology
• Glycoscience

Background:

• Extracellular vesicles (EVs) show therapeutic potential, but efficient targeting requires engineering.
• Carbohydrates (glycans) are crucial for EV biology and cell interactions.
• Genetic glycoengineering of parental cells for EV modification remains underexplored.

Purpose of the Study:

• To investigate targeted glycan modification of EVs through cell-based glycoengineering.
• To establish a method for generating glycoengineered EVs via genetic manipulation of parental cell glycosylation machinery.
• To assess the impact of glycoengineering on EV characteristics and production.

Main Methods:

• Genetic modification of HEK293F cells by knocking out key glycosylation pathway genes (e.g., MGAT1, C1GALT1C1, B4GALT5/6, B4GALT7, GNE).
• Analysis of glycan changes on cells using differential lectin staining.
• Isolation and characterization of small EVs (sEVs) from engineered cells, assessing glycan profiles, production, size, and biomarker expression.

Main Results:

• Successful gene editing resulted in corresponding glycan alterations on parental cells.
• Isolated sEVs exhibited glycan changes mirroring parental cells, with some unique structural enrichments and absences.
• Genetic glycoengineering did not significantly affect sEV production, size, or syntenin-1 expression, though clonal variation in yield was noted.

Conclusions:

• Demonstrated successful implementation of sEV glycoengineering via parental cell genetic modification.
• Established a stable source for generating glycoengineered sEVs.
• Glycoengineered EVs offer a promising tool for studying glycosylation in EV biology and optimizing EVs for therapeutics.