Prophylactically Decontaminating Human Islet Product for Safe Clinical Application: Effective and Potent Method

Area of Science:

• Cellular transplantation
• Microbiology
• Diabetes research

Background:

• Pancreatic islet transplantation is crucial for Type 1 diabetes treatment.
• Ensuring islet product safety requires minimizing microbial contamination and endotoxin levels.
• High-quality islets are essential for successful transplantation outcomes.

Purpose of the Study:

• To evaluate a refined decontamination method for pancreatic islets.
• To compare the efficacy of a simple (single antibiotic) versus a refined (triple antimicrobial agents) method in reducing contamination.
• To assess the safety of the refined method for clinical islet manufacturing.

Main Methods:

• A total of 443 pancreata were processed for islet isolation.
• Two decontamination methods were compared: simple (n=164) and refined (n=279).
• Microbial testing (Gram stain, aerobic/anaerobic culture) and endotoxin level measurements were performed at various stages.

Main Results:

• Pre-process contamination was observed in 17.8% of pancreata.
• Final product contamination (pre-process and post-culture positive) was significantly lower with the refined method (5% vs. 20.5%, p=0.045).
• Identical microbial species were found in pre-process and final product samples.

Conclusions:

• The refined method effectively reduces contamination rates in the islet final product.
• The refined method is safe for clinical application in islet manufacturing.
• This approach may standardize human islet manufacturing and facilitate regulatory approval.