Microfluidic device for multimodal characterization of pancreatic islets.

Area of Science:

• Biomedical Engineering
• Endocrinology
• Transplantation Science

Background:

• Pancreatic islet transplantation is a promising therapy for type 1 diabetes.
• Accurate pre-transplantation assessment of islet function is crucial for successful outcomes.
• Current functional assays have limitations in predicting long-term islet viability and function.

Purpose of the Study:

• To develop and characterize a microfluidic device for multimodal assessment of pancreatic islet function.
• To enable simultaneous evaluation of mitochondrial membrane potential, intracellular calcium, and insulin secretion.
• To provide a rapid and comprehensive method for assessing islet quality post-isolation.

Main Methods:

• Development of a microfluidic perfusion chamber capable of high flow rates (up to 1 mL/min).
• Simultaneous fluorescence imaging of mitochondrial membrane potential and intracellular calcium ([Ca(2+)](i)).
• Enzyme-linked immunosorbent assay (ELISA) for quantification of secreted insulin.
• Testing on both mouse and human pancreatic islets.

Main Results:

• The microfluidic device successfully perfuses islets without causing shear stress.
• Multimodal characterization revealed subtle variations in islet responses.
• The device demonstrated the ability to perform comprehensive islet analysis in short time periods.
• Mouse and human islets were successfully analyzed using this platform.

Conclusions:

• The developed microfluidic device offers a robust platform for comprehensive pancreatic islet analysis.
• This multimodal approach provides a more meaningful predictive value for islet functionality than single assays.
• The device can serve as a new gold standard for assessing islet quality prior to transplantation.
• Improved islet assessment may lead to better transplantation decisions and outcomes.