Islet preconditioning via multimodal microfluidic modulation of intermittent hypoxia

Area of Science:

• Endocrinology and Metabolism
• Biomedical Engineering
• Cellular Physiology

Background:

• Hypoxia significantly impacts pancreatic islet function, crucial for glucose homeostasis and transplantation.
• Current methods lack the ability to dynamically modulate oxygen and glucose for studying real-time islet responses.

Purpose of the Study:

• To investigate the effects of hypoxia on glucose-stimulated insulin secretion using a novel microfluidic device.
• To evaluate the protective effects of intermittent hypoxia (IH) preconditioning on islet function under hypoxic conditions.

Main Methods:

• Utilized a microfluidic device enabling simultaneous dynamic modulation of oxygen and glucose levels.
• Quantified islet responses via calcium influx, mitochondrial membrane potential, and insulin secretion.
• Investigated the role of mitochondrial K(ATP) channels in IH preconditioning.

Main Results:

• Hypoxia suppressed glucose-induced calcium responses, mitochondrial hyperpolarization, and insulin secretion.
• Intermittent hypoxia preconditioning significantly improved islet insulin secretion under hypoxic conditions.
• Blocking mitochondrial K(ATP) channels abolished the benefits of IH preconditioning.

Conclusions:

• Dynamic oxygen-glucose modulation in microfluidics reveals hypoxic impairment of islet function.
• Intermittent hypoxia preconditioning offers a protective strategy to enhance islet function, potentially improving transplant outcomes.
• Mitochondrial K(ATP) channels are key mediators in the protective effects of IH preconditioning on islets.