Hyaluronan microspheres for sustained gene delivery and site-specific targeting

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Hyaluronan (HA) is a versatile biopolymer widely used in biomedical and cosmetic fields.
• Formulating native HA into microspheres for controlled delivery is challenging without organic solvents or chemical modification.
• Existing methods often require harsh conditions or alter HA's native properties.

Purpose of the Study:

• To develop a novel, efficient method for preparing native hyaluronan microspheres.
• To evaluate the potential of these microspheres for controlled DNA delivery and targeted cell binding.
• To establish a versatile platform for advanced biomedical applications.

Main Methods:

• Utilized adipic dihydrazide-mediated crosslinking chemistry to form HA microspheres from native hyaluronan.
• Incorporated plasmid DNA into the microspheres for gene delivery evaluation.
• Conjugated microspheres with monoclonal antibodies for cell-specific targeting.

Main Results:

• Successfully generated robust hyaluronan microspheres with a size distribution of 5-20 micrometers.
• Demonstrated sustained release of encapsulated plasmid DNA over several months, with successful in vitro and in vivo transfection capabilities.
• Showcased selective binding of antibody-conjugated microspheres to cells expressing E- and P-selectin receptors.

Conclusions:

• Developed a novel and efficient method for preparing native hyaluronan microspheres.
• The microspheres offer controlled DNA release and are suitable for gene therapy applications.
• The platform is adaptable for site-specific targeting, enhancing its potential in advanced medical treatments.