胰岛α细胞量在糖尿病发展过程中的变化及其机制
The Change of α Cell Mass and Its Mechanism with Diabetic Progress
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摘要: 目的 探讨胰岛α细胞量随糖尿病发展的变化及其机制。方法 以多次低剂量链脲菌素诱导形成糖尿病小鼠,在糖尿病第4、12、20周时将其放血处死,并设同龄正常对照组。以Glucagon与Ki67,或BrdU、或Cleaved-Caspase 3、或TUNEL的免疫荧光双标检测胰岛α细胞量的变化、α细胞的增生和凋亡;以Glucagon、Neurogenin 3与MafA免疫荧光三标及Western blot检测胰岛α细胞的新生。结果 糖尿病发展期间胰岛α细胞量逐渐增加,与正常对照比较差异有统计学意义 (P<0.05);期间胰岛α细胞并未发生明显增生和凋亡,但胰岛内出现了许多Neurogenin 3阳性细胞及Glucagon、Neurogenin 3、MafA共阳性细胞。结论 在糖尿病发展过程中胰岛α细胞量不断增加,其机制与α细胞新生密切相关。Abstract: Objective To explore the change of α cell mass and its mechanism with diabetic progress. Methods Diabetic mice were killed by exsanguinations after 4, 12 and 20 weeks of diabetes, respectively. Indirect double immunofluorescences for Insulin/Ki67, or BrdU, Cleaved-Caspase 3, TUNEL were used to evaluate pancreatic α cell mass, regeneration and apoptosis of α cells. Indirect triple immunofluorescences for Glucagon/Neurogenin 3/MafA and Western blot analysis for Neurogenin 3 were used to determine neogenesis of pancreatic α cells. Results Pancreatic α cell mass was gradually increased with diabetic progress. It was significantly different from that of controls. There weren’t any proliferation and apoptosis of α cell during diabetes, however, many Neurogenin 3+ cells appeared in the pancreatic islets of diabetic mice, and most of them were co-stained with MafA and Glucagon. Conclusion Pancreatic α cell mass is gradually increased with diabetic progress. It seems to be strongly associated with neogenesis of pancreatic α cells.
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