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Title

Heme oxygenase-1 induction in islet cells results in protection from apoptosis and improved in vivo function after transplantation

Authors
Pileggi, A
Molano, R D
Cattan, P
Vizzardelli, C
Oliver, R
Fraker, C
Ricordi, C
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Published in Diabetes. 2001, vol. 50, no. 9, p. 1983-91
Abstract Transplantation of islets of Langerhans represents a viable therapeutic approach for the treatment of type 1 diabetes. Unfortunately, transplanted islets are susceptible to allogeneic recognition and rejection, recurrence of autoimmunity, and destruction by local inflammation at the site of implantation. The last of these phenomena might not only result in functional impairment and death of islet cells but could also contribute to amplifying the subsequent specific immune response. Induction of islet cell protection against inflammation could therefore be postulated to be a powerful means to improve overall graft fate. Heme oxygenase-1 (HO-1) has been described as an inducible protein capable of cytoprotection via radical scavenging and apoptosis prevention. The purpose of the present study was to analyze whether HO-1 upregulation in a beta-cell line and in freshly isolated murine islets could result in protection from apoptosis and improve in vivo functional performance. HO-1 upregulation was induced reproducibly with protoporphyrins and was correlated with protection from apoptosis induced in vitro with proinflammatory cytokines or Fas engagement. Furthermore, in vivo HO-1 upregulation resulted in improved islet function in a model of marginal mass islet transplantation in rodents. Strategies aimed at inducing HO-1 upregulation might result in improved success in islet transplantation.
Keywords AnimalsApoptosis/physiologyBlood Glucose/metabolismEnzyme InductionHeme Oxygenase (Decyclizing)/metabolismHeme Oxygenase-1Islets of Langerhans/drug effects/enzymology/physiologyIslets of Langerhans TransplantationMaleMembrane ProteinsMiceMice, Inbred C57BLProtoporphyrins/pharmacologyReference ValuesTime FactorsTransplantation, IsogeneicTumor Cells, CulturedTumor Necrosis Factor-alpha/physiologyUp-Regulation
Identifiers
PMID: 11522663
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Article (Published version) (192 Kb) - public document Free access
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Research group La transplantation d'îlots de Langerhans (623)
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PILEGGI, A et al. Heme oxygenase-1 induction in islet cells results in protection from apoptosis and improved in vivo function after transplantation. In: Diabetes, 2001, vol. 50, n° 9, p. 1983-91. https://archive-ouverte.unige.ch/unige:48157

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Deposited on : 2015-03-12

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