Pancreatic islet macroencapsulation using microwell porous membranes

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Endocrinology

Background:

• Allogeneic islet transplantation is a potential cure for type 1 diabetes but faces challenges due to the suboptimal intrahepatic environment.
• The liver's high drug and nutrient concentrations negatively impact transplanted islet function and survival.

Purpose of the Study:

• To develop a novel macroencapsulation device for islet transplantation.
• To create a protected environment for islets outside the liver, preserving their endocrine function and glucose responsiveness.

Main Methods:

• Development of a macroencapsulation device using thin microwell membranes made of poly(ether sulfone)/polyvinylpyrrolidone.
• Seeding islets in separate microwells to prevent aggregation and tailoring membrane porosity for nutrient, glucose, and insulin transport.
• Manufacturing membranes via phase separation micro molding.

Main Results:

• The device successfully prevented islet aggregation and preserved native islet morphology.
• Encapsulated islets demonstrated maintained glucose responsiveness and function after 7 days in culture, with a stimulation index above 2.
• The developed macroencapsulation system shows potential for successful islet transplantation.

Conclusions:

• The novel macroencapsulation device offers a promising strategy for islet transplantation in type 1 diabetes.
• This approach overcomes the limitations of the intrahepatic transplantation site by providing a controlled microenvironment.
• Further research into this device could advance cell-based therapies for diabetes.