Improved, low-cost methods for pancreatic islet purification in rats

Area of Science:

• Islet isolation and purification
• Biotechnology
• Cell separation techniques

Background:

• Ficoll is the standard reagent for density gradient separation of pancreatic islets.
• Ficoll significantly increases the cost of islet isolation procedures.

Purpose of the Study:

• To evaluate Lymphoprep and Iodixanol (OptiPrep) as potential lower-cost alternatives to Ficoll for islet purification.
• To assess the impact of these density gradients on islet yield, purity, morphology, and in vitro function.

Main Methods:

• Pancreata from Wistar rats were digested using collagenase V.
• Islets were purified using three density gradient methods: Ficoll, Lymphoprep, and Iodixanol (OptiPrep).
• Purified islets were assessed for yield (islet equivalents), purity, morphology, and in vitro function.

Main Results:

• No significant differences in islet yield (IEQ) were observed among the three methods.
• Lymphoprep and Iodixanol (OptiPrep) groups showed significantly higher purity compared to the Ficoll group.
• Islet viability was significantly higher in the Lymphoprep and Iodixanol (OptiPrep) groups (>90%) compared to Ficoll.
• In vitro islet function remained comparable across all three purification methods.

Conclusions:

• Lymphoprep and Iodixanol (OptiPrep) are effective substitutes for Ficoll in islet isolation, offering comparable islet yield and in vitro function.
• These density gradient methods provide a high-purity, high-viability islet cell preparation.
• Lymphoprep and Iodixanol (OptiPrep) represent potential low-cost alternatives for routine islet purification.