Augmented liver targeting of exosomes by surface modification with cationized pullulan.

Area of Science:

• Biotechnology
• Nanomedicine
• Hepatology

Background:

• Exosomes are promising nanotherapeutics for inflammatory conditions.
• Current exosome surface modification methods, like gene transfection, are complex.
• Targeting exosomes to specific tissues, particularly the liver, remains a challenge.

Purpose of the Study:

• To investigate the surface modification of exosomes with cationized pullulan for enhanced liver targeting.
• To evaluate the therapeutic efficacy of modified exosomes in an experimental liver injury model.
• To explore the role of the asialoglycoprotein receptor (AGPR) in exosome uptake.

Main Methods:

• Exosomes were surface-modified by electrostatic interaction with cationized pullulan.
• In vitro studies involved assessing the internalization of modified exosomes into HepG2 cells.
• In vivo studies utilized a concanavalin A-induced liver injury mouse model to evaluate exosome accumulation and therapeutic effects.

Main Results:

• Cationized pullulan-modified exosomes showed significantly greater internalization into HepG2 cells via AGPR.
• Modified exosomes specifically accumulated in the injured liver tissue following intravenous injection in mice.
• Surface modification led to a markedly enhanced anti-inflammatory effect and therapeutic benefit in the liver injury model.

Conclusions:

• Surface modification of exosomes with cationized pullulan is a simple and effective strategy for liver targeting.
• This modification enhances exosome accumulation in injured liver tissue, improving therapeutic outcomes.
• Cationized pullulan-modified exosomes represent a promising nanotherapeutic approach for treating inflammatory liver diseases.