In a previous study, we observed that multiple low doses of streptozotocin (STZ) can induce spontaneous restoration of normoglycemia in adult mouse diabetes models. In the present study, we sought to identify when spontaneous recovery from diabetes occurs and to disclose the changes in the diabetic data of diabetic mice induced by multiple low doses of streptozotocin (MLD-STZ mice). After inducing type 1 diabetes mellitus, radioimmunoassay, indirect immunofluorescence and hematoxylin-eosin staining were used to determine the diabetic data of MLD-STZ mice. In MLD-STZ mice, the diabetic indicators, including food intake, water consumption, body weight, blood glucose level and serum insulin concentration, developed gradually until week 20. Thereafter, the symptoms of diabetes gradually improved. By the week 36, although body weight and β cell masses remained significantly different between the MLD-STZ mice and the age-matched control animals, food intake, water consumption, blood glucose levels and serum insulin concentrations had all returned to normal levels, and no lymphocytic infiltrations were observed in pancreatic islets. This data demonstrates that MLD-STZ can induce spontaneous recovery from diabetes mellitus in adult mice, suggesting further research into the processes by which normoglycemia is recovered.
多次小剂量链脲佐菌素 (streptozotocin,STZ)诱导的迟发型1型糖尿病成年小鼠 (MLD-STZ成年鼠)血糖水平可自发恢复正常。该文试图对该现象及发生该现象的MLD-STZ成年鼠糖尿病指标进行综合分析。造模后,以放射免疫分析法、免疫荧光和HE染色等技术研究MLD-STZ鼠糖尿病各指标的变化。结果发现,糖尿病发生后,MLD-STZ鼠的摄食、饮水、体重、血糖和血清胰岛素水平等均随患病时间延长而逐渐加重,在糖尿病第20周时最为严重,此后,上述指标、胰岛β细胞量及胰岛炎症等逐渐改善。在糖尿病第36周时,尽管血糖水平正常的MLD-STZ鼠体重尚不及正常对照,但其摄食、饮水、血糖和血清胰岛素水平等尽皆恢复正常,且其胰岛内未见淋巴细胞浸润。上述结果说明MLD-STZ成年鼠糖尿病各指标可自发恢复至正常水平。
Keywords: Blood glucose; Mouse; Streptozotocin; Type 1 diabetes mellitus; β cell mass.