“…As Reg gene expression was observed in the phase of transient β cell proliferation: for example, in pancreatic islets of diabetic BB/Wor//Tky rats during the remission phase of diabetes [32], in islets of nonobese diabetic mice during active diabetogenesis [33] and pancreatic ductal cells, which are thought to be progenitor cells of β cells, during differentiation and proliferation in a mouse model of autoimmune diabetes [34, 35], and inflammation and cell death in and/or around islets was involved in these cases, we used inflammatory cytokines such as IL-1 β , TNF- α , and IFN- γ [36], as well as pancreatic β cell toxic agents, such as palmitate [37, 38], H 2 O 2 [39, 40], SNAP [41, 42], and STZ [43, 44]. Other factors, which were reported to upregulate Reg gene expression in β cells, such as IL-6 [13, 31], glucocorticoid [13, 31], IL-22 [6, 45], IFN- β [35], PDGF [46], and amino acids [46], were tested.…”