Drug Integrating Amphiphilic Nano-Assemblies: 2. Spatiotemporal Distribution within Inflammation Sites

Area of Science:

• Biomaterials Science
• Immunology
• Regenerative Medicine

Background:

• Systemic immunosuppression limits allogeneic cell transplantation due to side effects.
• Localized drug delivery can prevent graft loss by innate and adaptive immunity while minimizing systemic exposure.
• Nanoparticles offer a platform for sustained, localized drug delivery to inflamed sites relevant for transplantation.

Purpose of the Study:

• To evaluate drug-integrating amphiphilic nanomaterial assemblies (DIANAs) for targeted drug delivery to inflamed sites.
• To assess the potential of spherical nanomicelles (nMIC) for passive targeting and nanofibrils (nFIB) for co-implantation in islet transplantation models.

Main Methods:

• In vivo biodistribution and cellular uptake studies of fluorescently labeled nMIC and nFIB in mice.
• Inflammation models included LPS injection, biomaterial-coated bead implantation, and cell transplant models.
• Evaluation of DIANA uptake by immune cells involved in graft inflammation.

Main Results:

• Systemically administered nMIC reached inflamed graft sites.
• Co-implanted nFIB demonstrated sustained localization at the graft site for several days.
• DIANAs were effectively taken up by immune cells implicated in graft rejection.

Conclusions:

• DIANAs provide a versatile platform for targeted and localized delivery of immunomodulatory drugs.
• This approach can mitigate innate and adaptive immune responses, reducing graft loss in cell transplantation.
• DIANAs hold promise for improving the efficacy of regenerative medicine strategies, such as islet transplantation for type 1 diabetes.