Adenovirus-mediated catalase gene transfer reduces oxidant stress in human, porcine and rat pancreatic islets |
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Authors: | P Y Benhamou C Moriscot M J Richard O Beatrix L Badet F Pattou J Kerr-Conte J Chroboczek P Lemarchand S Halimi |
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Institution: | (1) Department of Endocrinology, University Hospital, Grenoble, France, FR;(2) Institute of Structural Biology, Grenoble, France, FR;(3) Department of Surgery, University Hospital, Lille, France, FR;(4) INSERM U25, Necker School of Medicine, Paris, France, FR |
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Abstract: | Summary Susceptibility of pancreatic islets to oxidant stress may affect islet viability and contribute to primary non function of
allo- or xenogenic grafts. We investigated the influence of overexpression of catalase (CAT) on the viability of human, porcine
and rat islets, as well as INS-1 beta-cell line. Islets were transfected with a replication-deficient adenovirus vector containing
human CAT cDNA under the control of the adenovirus major late promoter (AdCAT) or a vector containing no foreign gene (AdNull)
and used as a control. Oxidant stress was induced 48 h later by xanthine oxidase-hypoxanthine (XO 25 mU/ml, HX 0.5 mmol/l)
or hydrogen peroxide (100 or 250 μmol/l). Islet cell viability was assessed 72 h after CAT transfer by 4-3-(4-Idophenyl)-2-(4
nitrophenyl)-2H-5-tetrazolio]-1,2,benzene disulphonate (WST-1) test. Baseline catalase activity was three to fourfold lower
in porcine than in human islets. CAT activity was reproducibly increased 2.5- to 7-fold in AdCAT infected islets, at least
for 13 days. Overall, AdCAT conferred on human and pig islets a protection of 26.1 ± 6.1 and 21.2 ± 9.8 % on XOHX injury and
35.4 ± 4.2 and 57.9 ± 10.5 % on H2O2 stress. Similarly, rat islet cells and INS-1 cells were protected on XOHX stress by 17.8 ± 2.3 and 30.8 ± 8.7 %, respectively.
AdNull had no effect. Basal and stimulated insulin secretion was preserved in AdCAT-transfected human islets despite a XOHX
challenge. This study validates adenovirus-mediated catalase gene transfer as a realistic approach to reduce non specific
inflammation effects on human or porcine islet grafts. Moreover the relevance of defense mechanisms, previously suggested
in human islets, is here illustrated in porcine islets. Diabetologia (1998) 41: 1093–1100]
Received: 4 November 1997 and in revised form: 17 March 1998 |
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Keywords: | Islet transplantation porcine xenograft catalase oxidant stress superoxide dismutase reactive oxygen species adenovirus gene transfer |
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