Multifunctional core-shell polymeric nanoparticles for transdermal DNA delivery and epidermal Langerhans cells...

Area of Science:

• Immunology
• Nanotechnology
• Biomedical Engineering

Background:

• Skin's immune reactivity makes it a prime site for DNA immunization.
• Antigen-presenting cells like Langerhans cells (LCs) are abundant in the skin.
• Efficient DNA delivery systems are crucial for effective DNA immunization.

Purpose of the Study:

• To develop a multifunctional core-shell nanoparticle system for transdermal DNA delivery.
• To utilize nanoparticles for tracking Langerhans cell migration and gene expression.
• To explore the potential of this system in immunotherapy and vaccine development.

Main Methods:

• Fabrication of core-shell nanoparticles with a PLGA core (loaded with quantum dots) and a glycol chitosan shell (adsorbed with reporter gene).
• Transdermal delivery of nanoparticles into the epidermis using a gene gun.
• Characterization of nanoparticles using fluorescence spectrophotometry, TEM, EDX, and XRD.
• In vivo assessment in a mouse model to evaluate transfection, migration, and gene expression.

Main Results:

• Nanoparticles confirmed to have a core-shell structure with quantum dots in the core.
• pH-dependent surface charge of nanoparticles facilitated intracellular DNA release.
• Successful transfection of DNA into epidermal Langerhans cells (LCs) via gene gun delivery.
• Demonstrated migration of transfected LCs and reporter gene expression in skin-draining lymph nodes.

Conclusions:

• The developed core-shell nanoparticle system is effective for transdermal DNA delivery and immunization.
• The system allows for ultrasensitive monitoring of Langerhans cell migration and gene expression.
• This technology holds significant potential for advancing immunotherapy and vaccine development.