Document Detail

Impact of Size in Pancreatic Islet Transplantation and Potential Interventions to Improve Outcome.
MedLine Citation:
PMID:  24143907     Owner:  NLM     Status:  Publisher    
Better results have been recently reported inclinical pancreatic islet transplantation (ITX) due mostly to improved isolation techniques and immunosuppression; however, some limitations still exist. It is known that following transplantation from 30 to 60% of the islets is lost. In our study, we have investigated: 1) the role of size as a factor affecting islet engraftment and, 2) potential procedural manipulations to increase the number of smaller functional islets that can be transplanted. C57/BL10 mice were used as donors and recipients in a syngeneic islet transplant model. Isolated islets were divided by size (large, >300 ?m; medium 150-300 μm; small, <150 μm). Each size was transplanted in chemically induced diabetic mice as full (600 IEq), suboptimal (400 IEq), and marginal mass (200 IEq). Control animals received all size islets. Engraftment was defined as reversal of diabetes by day 7 posttransplantation. When the superiority of smaller islets was observed, strategies of overdigestion and fragmentation wereadopted during islet isolation in the attempt to reduce islet size and improve engraftment. Smaller islets were significantly superior in engraftment as compared to medium, large, and control (all sizes) groups. This was more evident when marginal mass data were compared. In all masses, success decreased as islet sizes increased. Once islets were engrafted, functionality was notaffected by size. When larger islets were fragmented, a significant decrease in islet functionality was observed. On the contrary, if pancreata were slightly over-digested, although not as successfulas small naive islets, an increase in engraftment was observed when compared to the control group. In conclusion, smaller islets are superior in engraftment following islet transplantation. Fragmentation has a deleterious effect on islet engraftment. Islet isolations can be performed reducing islet size with slight over-digestion and it can be safely adopted to improve clinical outcome.
Daria Zorzi; Tammy Phan; Marco Sequi; Yong Lin; Daniel H Freeman; Luca Cicalese; Cristiana Rastellini
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-10-18
Journal Detail:
Title:  Cell transplantation     Volume:  -     ISSN:  1555-3892     ISO Abbreviation:  Cell Transplant     Publication Date:  2013 Oct 
Date Detail:
Created Date:  2013-10-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9208854     Medline TA:  Cell Transplant     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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