Controlled Nutrient Delivery to Pancreatic Islets Using Polydopamine-Coated Mesoporous Silica Nanoparticles

Area of Science:

• Biomaterials Science
• Islet Transplantation
• Nanotechnology

Background:

• Pancreatic islet transplantation is a promising therapy for diabetes.
• Islet survival and function depend on nutrient supply.
• Controlled nutrient delivery systems are needed to improve transplantation outcomes.

Purpose of the Study:

• To develop a nanoscale platform for controlled nutrient delivery to pancreatic islets.
• To investigate the efficacy of a polydopamine-coated mesoporous silica nanoparticle (PDG-MSNP) system for glutamine delivery.
• To evaluate the impact of PDG-MSNPs on islet engraftment and function in a diabetic mouse model.

Main Methods:

• Fabrication of mesoporous silica nanoparticles (MSNPs) loaded with glutamine (G).
• Coating MSNPs with a polydopamine (PD) layer to control G release.
• In vitro characterization of G release kinetics.
• In vivo assessment of PDG-MSNP efficacy following syngeneic renal subcapsule islet transplantation in diabetic mice.

Main Results:

• Optimized PD coating (0.5 mg/mL, 0.5 h) successfully delayed G release from MSNPs over 14 days (57.4 ± 4.7%).
• PDG-MSNPs significantly improved islet engraftment, characterized by enhanced revascularization and reduced inflammation.
• Transplanted islets supported by PDG-MSNPs led to the re-establishment of glycemic control in diabetic mice.

Conclusions:

• The developed PDG-MSNP platform provides a controlled and sustained supply of glutamine to transplanted islets.
• This nanotechnology-based approach enhances islet survival, function, and therapeutic efficacy.
• PDG-MSNPs represent a promising strategy for improving outcomes in islet transplantation for diabetes treatment.