Toward improving human islet isolation from younger donors: rescue purification is efficient for trapped islets

Area of Science:

• Islet biology
• Transplantation immunology
• Biomedical engineering

Background:

• Younger donor pancreata yield higher quality islets for clinical islet transplantation.
• Continuous gradient purification (CGP) is inefficient, limiting the use of younger donor pancreata.

Purpose of the Study:

• To evaluate the efficacy of rescue gradient purification (RGP) in recovering trapped islets.
• To assess the quality of islets purified by RGP compared to CGP.
• To investigate the impact of donor age on islet recovery and quality.

Main Methods:

• Retrospective analysis of 73 human islet isolations purified by CGP followed by RGP.
• Islets divided into two groups based on donor age (<=40 and >40).
• Assessment of islet quality using beta-cell fractional viability (beta FV) and ADP/ATP ratio.

Main Results:

• RGP significantly increased islet recovery, particularly from younger donors (Group I).
• Donor age negatively correlated with RGP islet recovery and the percentage of trapped islets.
• RGP-purified islets demonstrated higher beta FV and improved ADP/ATP ratio compared to CGP islets.

Conclusions:

• RGP is an effective method for recovering trapped islets, especially from younger donor pancreata.
• RGP improves both the quantity and quality of islets for transplantation.
• The enhanced quality of RGP islets supports its routine use in clinical islet isolation protocols.