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Pancreatic Islet Isolation and Purification from Lewis Rats Using Enzymatic Digestion and Density-Gradient Separation
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Antiproinflammatory effects of iodixanol (OptiPrep)-based density gradient purification on human islet preparations
A Mita1, C Ricordi, S Messinger
1Cell Transplant Center, Diabetes Research Institute, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA.
Cell Transplantation
|August 20, 2010
Summary
OptiPrep density gradients improve human islet cell survival and reduce inflammatory cytokine production compared to Ficoll, potentially enhancing islet transplantation success. This method offers better beta-cell mass preservation post-isolation.
Area of Science:
- Endocrinology
- Transplantation Immunology
- Cell Biology
Background:
- Islet transplantation is a key treatment for type 1 diabetes.
- Current purification methods like Ficoll gradients can stress islets, reducing their viability.
- Iodixanol (OptiPrep) gradients show promise for improved islet purification and transplantation outcomes.
Purpose of the Study:
- To compare the efficacy of OptiPrep-based versus Ficoll-based density gradients for human islet purification.
- To assess the impact of purification methods on islet yield, purity, viability, and inflammatory markers.
Main Methods:
- Human islets were isolated using a modified automated method.
- Islet preparations were purified using either OptiPrep or Ficoll continuous density gradients.
- Islet quality, cellular composition, and inflammatory mediator production were evaluated post-purification and after 48-hour culture.
Main Results:
- OptiPrep and Ficoll yielded comparable islet purity, recovery, and beta-cell viability.
- OptiPrep significantly improved beta-cell mass after 48-hour culture compared to Ficoll.
- OptiPrep significantly reduced the production of key inflammatory cytokines (e.g., IL-1β, TNF-α) while tissue factor production remained similar.
Conclusions:
- OptiPrep density gradient purification enhances human islet beta-cell survival and reduces inflammatory responses during pre-transplant culture.
- OptiPrep offers a potential advantage over Ficoll for improving islet transplantation success rates.
