Laboratory of Diabetes and Experimental Endocrinology, Department of Clinical Sciences, University of Barcelona, Hospital Universitari de Bellvitge, Feixa Llarga s/n, 08907 L'Hospitalet de Llobregat, Barcelona. Spain.
Endocrinology. 2011 Jul;152(7):2580-8. doi: 10.1210/en.2011-0066. Epub 2011 May 10.
β-Cell mass reduction is a central aspect in the development of type 1 and type 2 diabetes, and substitution or regeneration of the lost β-cells is a potentially curative treatment of diabetes. To study the effects of gastrin on β-cell mass in rats with 95% pancreatectomy (95%-Px), a model of pancreatic regeneration, rats underwent 95% Px or sham Px and were treated with [15 leu] gastrin-17 (Px+G and S+G) or vehicle (Px+V and S+V) for 15 d. In 95% Px rats, gastrin treatment reduced hyperglycemia (280 ± 52 mg vs. 436 ± 51 mg/dl, P < 0.05), and increased β-cell mass (1.15 ± 0.15 mg)) compared with vehicle-treated rats (0.67 ± 0.15 mg, P < 0.05). Gastrin treatment induced β-cell regeneration by enhancing β-cell neogenesis (increased number of extraislet β-cells in Px+G: 0.42 ± 0.05 cells/mm(2) vs. Px+V: 0.27 ± 0.07 cells/mm(2), P < 0.05, and pancreatic and duodenal homeobox 1 expression in ductal cells of Px+G: 1.21 ± 0.38% vs. Px+V: 0.23 ± 0.10%, P < 0.05) and replication (Px+G: 1.65 ± 0.26% vs. S+V: 0.64 ± 0.14%; P < 0.05). In addition, reduced β-cell apoptosis contributed to the increased β-cell mass in gastrin-treated rats (Px+G: 0.07 ± 0.02%, Px+V: 0.23 ± 0.05%; P < 0.05). Gastrin action on β-cell regeneration and survival increased β-cell mass and improved glucose tolerance in 95% Px rats, supporting a potential role of gastrin in the treatment of diabetes.
β 细胞质量减少是 1 型和 2 型糖尿病发展的一个核心方面,而替代或再生丢失的β细胞是糖尿病的一种潜在治疗方法。为了研究胃泌素对 95%胰切除术(95%-Px)大鼠β细胞质量的影响,我们建立了胰腺再生模型,大鼠接受 95% Px 或假手术(S+Px),并接受 [15 亮氨酸] 胃泌素-17(Px+G 和 S+G)或载体(Px+V 和 S+V)治疗 15 天。在 95% Px 大鼠中,与载体处理的大鼠相比,胃泌素治疗降低了高血糖(280±52 mg 与 436±51 mg/dl,P<0.05),并增加了β细胞质量(1.15±0.15 mg)(0.67±0.15 mg,P<0.05)。胃泌素治疗通过增强β细胞新生(在 Px+G 中增加胰岛外β细胞的数量:0.42±0.05 个细胞/mm2 与 Px+V:0.27±0.07 个细胞/mm2,P<0.05,以及 Px+G 中导管细胞的胰腺十二指肠同源盒 1 表达:1.21±0.38% 与 Px+V:0.23±0.10%,P<0.05)和复制(Px+G:1.65±0.26% 与 S+V:0.64±0.14%,P<0.05)诱导β细胞再生。此外,减少的β细胞凋亡有助于胃泌素处理的大鼠中β细胞质量的增加(Px+G:0.07±0.02%,Px+V:0.23±0.05%,P<0.05)。胃泌素对β细胞再生和存活的作用增加了 95% Px 大鼠的β细胞质量,并改善了葡萄糖耐量,支持胃泌素在糖尿病治疗中的潜在作用。