Donor Pretreatment with DHMEQ Improves Islet Transplantation

Background. Currently, pancreatic islet transplantation to achieve normoglycemia in insulin-dependent diabetes mellitus (IDDM) requires two or more donors. This may be due to the inability to transplant functionally preserved and viable islets after isolation. Islets have already been subjected to various harmful stresses during the isolation process leading to apoptosis. One of the intracellular signaling pathways, the transcription factor nuclear factor-kappa B (NF-kappa B)-related pathway, is relevant to the mechanism of beta-cell apoptosis in isolated islets. We attempted to prevent islet apoptosis during isolation by a novel NF-kappa B inhibitor, dehydroxymethylepoxyquinomicin (DHMEQ). Materials and Methods. DHMEQ was injected intra-peritoneally into donor mice 2 h prior to isolation. NF-kappa B activation, the functioning of isolated islets, apoptosis after isolation, and cytokine- and apoptosis-related genes were analyzed. After 160 equivalents of islets were transplanted into diabetic mice, graft survival and function were evaluated. Results. Intra-islet NF-kappa B was activated immediately after isolation, and DHMEQ inhibited NF-kappa B activation without deterioration of islet function. DHMEQ significantly prevented apoptosis by inhibiting caspase 3/7 activities and down-regulated Bax, a proapoptotic gene. Donor pretreatment with DHMEQ significantly improved engraftment in syngeneic islet transplantation in mice, thus preserving insulin contents in the graft liver, as assessed by functional and histologic analyses. Conclusions. DHMEQ is a promising agent in islet transplantation because it protects islets from apoptosis during isolation stress. Donor pretreatment with DHMEQ can significantly affect the success of islet engraftment. (C) 2010 Elsevier Inc. All rights reserved.