AIM:To investigate the antioxidant activity of chitooligosaccharides(COSs)on pancreatic islet cells in diabetic rats induced by streptozotocin. METHODS:The antioxidant effect of COSs on pancreatic islet cells was dete...AIM:To investigate the antioxidant activity of chitooligosaccharides(COSs)on pancreatic islet cells in diabetic rats induced by streptozotocin. METHODS:The antioxidant effect of COSs on pancreatic islet cells was detected under optical microscopy and with colorimetric assay and gel electrophoresis.The activities of glutathione peroxidase and superoxide dismutase,total antioxidant capacity,and content of malondialdehyde in serum and tissue slices of pancreas were examined after 60 d to determine the effect of COSs in streptozotocin-induced diabetes in rats. RESULTS:COSs can prohibit the apoptosis of pancreatic islet cells.All concentrations of COSs can improve the capability of total antioxidant capacity and activity of superoxide dismutase and decrease the content of malondialdehyde drastically.Morphological investigation in the pancreas showed that COSs have resulted in the reduction of islets,loss of pancreatic cells,and nuclear pyknosis of pancreatic cells. CONCLUSION:COSs possess various biological activities and can be used in the treatment of diabetes mellitus.展开更多
AIM: To investigate the effect of chitooligosaccharides on proliferation of pancreatic islet cells, release of insulin and 2 h plasma glucose in streptozotocin-induced diabetic rats.METHODS: In vitro, the effect of ch...AIM: To investigate the effect of chitooligosaccharides on proliferation of pancreatic islet cells, release of insulin and 2 h plasma glucose in streptozotocin-induced diabetic rats.METHODS: In vitro, the effect of chitooligosaccharides on proliferation of pancreatic islet cells and release of insulin was detected with optical microscopy, colorimetric assay, and radioimmunoassay respectively. In vivo, the general clinical symptoms, 2 h plasma glucose, urine glucose, oral glucose tolerance were examined after sixty days of feeding study to determine the effect of chitooligosaccharides in streptozotocin-induced diabetic rats. RESULTS: Chitooligosaccharides could effectively accelerate the proliferation of pancreatic islet cells. Chitooligosaccharides (100 mg/L) had direct and prominent effect on pancreastic β cells and insulin release from islet cells. All concentrations of chitooligosaccharides could improve the general clinical symptoms of diabetic rats, decrease the 2 h plasma glucose and urine glucose, and normalize the disorders of glucose tolerance.CONCLUSION: Chitooligosaccharides possess various biological activities and can be used in the treatment of diabetes mellitus.展开更多
目的探讨粉防己碱(T et)对脂多糖(LPS)诱发大鼠胰腺腺泡细胞损伤的保护作用及其机制。方法胶原酶法分离雄性SD大鼠胰腺腺泡细胞,预先经T et(50μm o l/L、100μm o l/L)处理15 m in后,再经LPS(10 m g/L)或正常培养液处理,在0、1、4和10 ...目的探讨粉防己碱(T et)对脂多糖(LPS)诱发大鼠胰腺腺泡细胞损伤的保护作用及其机制。方法胶原酶法分离雄性SD大鼠胰腺腺泡细胞,预先经T et(50μm o l/L、100μm o l/L)处理15 m in后,再经LPS(10 m g/L)或正常培养液处理,在0、1、4和10 h采集上清液,检测其中丙二醛(M DA)含量及超氧化物歧化酶(SOD)、磷脂酶A2(PLA2)活性;采用四甲基偶氮唑蓝比色法(M TT)检测胰腺腺泡细胞存活情况;部分胰腺腺泡细胞经F luo 3/AM荧光探针负载后,于相应时间点采用灌流方式给予T et或LPS,激光共聚焦显微镜观察单个胰腺腺泡细胞内钙离子浓度(〔C a2+〕i)。结果T et可减轻LPS所致的细胞损伤(P均<0.05),抑制LPS诱发的胰腺腺泡细胞〔C a2+〕i升高(P均<0.05),降低细胞培养上清液中M DA含量和PLA2活性、增加SOD活性。结论T et可能通过抑制钙超载、增强抗氧化能力以及减少胰酶活化,减少LPS所致胰腺腺泡细胞损伤,从而发挥对胰腺腺泡细胞的保护作用。展开更多
基金Supported by The National Scientific Research Fund of China(2008JK007)the National Key Research and Development Program of China for the Tenth Five-Year Plan,No.2006BAD06A14
文摘AIM:To investigate the antioxidant activity of chitooligosaccharides(COSs)on pancreatic islet cells in diabetic rats induced by streptozotocin. METHODS:The antioxidant effect of COSs on pancreatic islet cells was detected under optical microscopy and with colorimetric assay and gel electrophoresis.The activities of glutathione peroxidase and superoxide dismutase,total antioxidant capacity,and content of malondialdehyde in serum and tissue slices of pancreas were examined after 60 d to determine the effect of COSs in streptozotocin-induced diabetes in rats. RESULTS:COSs can prohibit the apoptosis of pancreatic islet cells.All concentrations of COSs can improve the capability of total antioxidant capacity and activity of superoxide dismutase and decrease the content of malondialdehyde drastically.Morphological investigation in the pancreas showed that COSs have resulted in the reduction of islets,loss of pancreatic cells,and nuclear pyknosis of pancreatic cells. CONCLUSION:COSs possess various biological activities and can be used in the treatment of diabetes mellitus.
基金Supported by the National High Technology Research and Development Program of China (863 Program, 2001AA625050) and the National Key Research and Development Program of China during the Tenth Five-Year Plan Period, No. 2001BA708B04-07
文摘AIM: To investigate the effect of chitooligosaccharides on proliferation of pancreatic islet cells, release of insulin and 2 h plasma glucose in streptozotocin-induced diabetic rats.METHODS: In vitro, the effect of chitooligosaccharides on proliferation of pancreatic islet cells and release of insulin was detected with optical microscopy, colorimetric assay, and radioimmunoassay respectively. In vivo, the general clinical symptoms, 2 h plasma glucose, urine glucose, oral glucose tolerance were examined after sixty days of feeding study to determine the effect of chitooligosaccharides in streptozotocin-induced diabetic rats. RESULTS: Chitooligosaccharides could effectively accelerate the proliferation of pancreatic islet cells. Chitooligosaccharides (100 mg/L) had direct and prominent effect on pancreastic β cells and insulin release from islet cells. All concentrations of chitooligosaccharides could improve the general clinical symptoms of diabetic rats, decrease the 2 h plasma glucose and urine glucose, and normalize the disorders of glucose tolerance.CONCLUSION: Chitooligosaccharides possess various biological activities and can be used in the treatment of diabetes mellitus.
文摘目的探讨粉防己碱(T et)对脂多糖(LPS)诱发大鼠胰腺腺泡细胞损伤的保护作用及其机制。方法胶原酶法分离雄性SD大鼠胰腺腺泡细胞,预先经T et(50μm o l/L、100μm o l/L)处理15 m in后,再经LPS(10 m g/L)或正常培养液处理,在0、1、4和10 h采集上清液,检测其中丙二醛(M DA)含量及超氧化物歧化酶(SOD)、磷脂酶A2(PLA2)活性;采用四甲基偶氮唑蓝比色法(M TT)检测胰腺腺泡细胞存活情况;部分胰腺腺泡细胞经F luo 3/AM荧光探针负载后,于相应时间点采用灌流方式给予T et或LPS,激光共聚焦显微镜观察单个胰腺腺泡细胞内钙离子浓度(〔C a2+〕i)。结果T et可减轻LPS所致的细胞损伤(P均<0.05),抑制LPS诱发的胰腺腺泡细胞〔C a2+〕i升高(P均<0.05),降低细胞培养上清液中M DA含量和PLA2活性、增加SOD活性。结论T et可能通过抑制钙超载、增强抗氧化能力以及减少胰酶活化,减少LPS所致胰腺腺泡细胞损伤,从而发挥对胰腺腺泡细胞的保护作用。
