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Co-encapsulation of bioengineered IGF-II-producing cells and pancreatic islets: effect on beta-cell survival.

Abstract : Insulin-like growth factor-II (IGF-II) has been shown to promote pancreatic β-cell survival. We evaluated the effect of co-encapsulating islets and bioengineered IGF-II-producing cells on islet cell survival. IGF-II or green fast protein (GFP) genes were transferred into TM4 cells, and purified using a neomycin resistance gene, leading to pure cell cultures (TM4-IGF-II or TM4-GFP) with a stable overexpression of the transferred gene. Islets were co-encapsulated with TM4-IGF-II or TM4-GFP, or encapsulated alone in alginate microcapsules. Rat and mouse islet cell survival was studied in vitro and in vivo, respectively. After 12 days in culture, islet viability (dual staining, acridine orange/propidium iodide) was 83% with TM4-IGF-II, compared with 51% (P<0.05) and 41% (P<0.001) with TM4-GFP and islets alone, respectively. The study of islet necrotic centers and the evaluation of islet function, using the MTS (3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium, inner salt) assay, yielded similar results. From 125 days after transplantation, more diabetic mice maintained normoglycemia when they were transplanted with islets co-encapsulated with TM4-IGF-II (4/7). A significant difference for the maintenance of normoglycemia was observed between recipients of islets co-encapsulated with TM4-IGF-II versus islets alone (P=0.023), or with TM4-GFP (P=0.048). In conclusion, the co-encapsulation of islets with bioengineered IGF-II-producing cells promotes islet cell survival.
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https://www.hal.inserm.fr/inserm-00628836
Contributor : Sarah Hamant <>
Submitted on : Tuesday, October 4, 2011 - 12:10:00 PM
Last modification on : Wednesday, July 15, 2020 - 9:10:03 AM

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Guillaume Jourdan, Julie Dusseault, Pierre-Yves Benhamou, L. Rosenberg, Jean-Pierre Hallé. Co-encapsulation of bioengineered IGF-II-producing cells and pancreatic islets: effect on beta-cell survival.. Gene Ther, 2011, 18 (6), pp.539-45. ⟨10.1038/gt.2010.166⟩. ⟨inserm-00628836⟩

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