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AIM: To investigate the effects of different parameters of gastric electrical stimulation(GES) on interstitial cells of Cajal(ICCs) and changes in the insulin-like growth factor 1(IGF-1) signal pathway in streptozotocininduced diabetic rats.METHODS: Male rats were randomized into control, diabetic(DM), diabetic with sham GES(DM + SGES), diabetic with GES1(5.5 cpm, 100 ms, 4 m A)(DM + GES1), diabetic with GES2(5.5 cpm, 300 ms, 4 m A)(DM + GES2) and diabetic with GES3(5.5 cpm, 550 ms, 2 m A)(DM + GES3) groups. The expression levels of c-kit, M-SCF and IGF-1 receptors were evaluated in the gastric antrum using Western blot analysis. The distribution of ICCs was observed using immunolabeling for c-kit, while smooth muscle cells and IGF-1 receptors were identified using α-SMA and IGF-1R antibodies. Serum level of IGF-1 was tested using enzyme-linked immunosorbent assay. RESULTS: Gastric emptying was delayed in the DM group but improved in all GES groups, especially in the GES2 group. The expression levels of c-kit, M-SCF and IGF-1R were decreased in the DM group but increased in all GES groups. More ICCs(c-kit+) and smooth muscle cells(α-SMA+/IGF-1R+) were observed in all GES groups than in the DM group. The average level of IGF-1 in the DM group was markedly decreased, but it was up-regulated in all GES groups, especially in the GES2 group. CONCLUSION: The results suggest that long-pulse GES promotes the regeneration of ICCs. The IGF-1 signaling pathway might be involved in the mechanism underlying this process, which results in improved gastric emptying.
AIM: To investigate the effects of different parameters of gastric electrical stimulation (GES) on interstitial cells of Cajal (ICCs) and changes in the insulin-like growth factor 1 (IGF-1) signal pathway in streptozotocin induced diabetic rats. METHODS: Male rats were randomized into control, diabetic (DM), diabetic with sham GES (DM + SGES), diabetic with GES1 (5.5 cpm, 100 ms, 4 m A) (DM + GES1) 4 m A) (DM + GES2) and diabetic with GES3 (5.5 cpm, 550 ms, 2 m A) (DM + GES3) groups. The expression levels of c-kit, M- SCF and IGF-1 receptors were evaluated in the gastric antrum using Western blot analysis. The distribution of ICCs was observed using immunolabeling for c-kit, while smooth muscle cells and IGF-1 receptors were identified using α-SMA and IGF-1R antibodies. using enzyme-linked immunosorbent assay. RESULTS: Gastric emptying was delayed in the DM group but improved in all GES groups, especially in the GES2 group. The e M-SCF and IGF-1R were decreased in the DM group but increased in all GES groups. More ICCs (c-kit +) and smooth muscle cells (α-SMA + / IGF- 1R +) were observed in all the GES groups than in the DM group. The average level of IGF-1 in the DM group was markedly decreased, but it was up-regulated in all GES groups, especially in the GES2 group. CONCLUSION: The results suggest that long-pulse GES promotes the regeneration of ICCs. The IGF-1 signaling pathway might be involved in the mechanism underlying this process, which results in improved gastric emptying.