西格列汀拮抗糖尿病胰岛β细胞炎症反应及与Keap1-Nrf2-ARE通路的关系
发布时间:2018-12-30 18:32
【摘要】:【目的】:探讨西格列汀(Sitagliptin,Sita)对糖尿病大鼠胰岛β细胞炎症反应的拮抗作用,对Keap1-Nrf2-ARE抗炎通路及其下游靶基因的影响。【方法】:将40只雄性SD大鼠分为两组,一组给予正常饲料喂养(NC组,n=10),一组给予高脂高糖饲料喂养(HSFC组,n=30)。8周后禁食12h,HSFC组大鼠一次性腹腔注射1%链脲佐菌素(Streptozotocin,STZ),剂量为30mg/kg,将空腹血糖连续三天≥16.7mmol/L的SD大鼠定为糖尿病大鼠。从中随机挑选20只,随机分为糖尿病组(DM组,n=10)和西格列汀干预组(Sita组,,n=10),Sita组给予西格列汀灌胃,剂量100mg/kg/d,NC组及DM组给予等量生理盐水灌胃。于第0、4、8、12、16、20周末测量体重和空腹血糖;第0、20周行胰岛素耐量实验(ITT)和腹腔注射葡萄糖耐量试验(IPGTT);对各组大鼠胰腺组织进行HE染色,观察组织形态学改变;进行荧光定量PCR(Q-PCR)及Western Blot检测胰腺中炎症因子Toll样受体4(TLR4)、转录因子核因子(NF-κB)及Keap1-Nrf2-ARE通路相关基因核因子E2相关因子(Nrf2)、Kelch样ECH相关蛋白1(Keap1)、血红素加氧酶-1(HO-1)的mRNA及蛋白的表达。【结果】:1、Sita干预8周后,Sita组空腹血糖明显低于DM组,差别有统计学意义(P0.05);DM组体重较NC组明显下降,差别有统计学意义(P0.05);Sita组较DM组体重差别无统计学意义(P0.05)。2、Sita干预20周后,Sita组空腹血糖明显低于DM组,差别有统计学意义(P0.05);Sita组较DM组体重差别无统计学意义(P0.05);Sita组IPGTT、ITT的曲线下面积比DM组明显降低,差别有统计学意义(P0.05)。3、DM组胰岛数量明显减少,且胰岛细胞球体积明显缩小;经Sita干预后的糖尿病大鼠胰腺组织胰岛数量无明显减少,胰岛球体积缩小。4、DM组TLR4、NF-κB、Nrf2、Keap1、HO-1mRNA及蛋白表达与NC组相比明显增高,差异有统计学意义(P0.05);而Sita组TLR4、NF-κB、Nrf2、Keap1、HO-1mRNA和蛋白表达较DM组明显减低,差异有统计学意义(P0.05)。【结论】:1、Sita能在不影响体重的情况下降低糖尿病大鼠的血糖,改善胰岛素抵抗。2、Sita减少糖尿病胰腺组织中胰岛的破坏,胰岛β细胞的凋亡。3、Sita通过抑制炎症通路TLR4/NF-κB的表达对糖尿病大鼠胰岛β细胞起抗炎作用。4、Sita通过抑制Nrf2-Keap1-ARE体系改善胰岛素抵抗,促进胰岛β细胞分泌胰岛素,且作用机制都跟其具有抗炎作用密切相关。
[Abstract]:[objective]: to investigate the antagonism of siglitatin (Sitagliptin,Sita) on the inflammatory response of islet 尾 cells in diabetic rats and the effect on the Keap1-Nrf2-ARE anti-inflammatory pathway and its downstream target genes. [methods] Forty male SD rats were divided into two groups. One group was fed with normal diet (NC group, 10%), the other group was fed with high fat and high sugar diet (HSFC group, 30%). After 12 weeks of fasting, rats in the control group were given a single intraperitoneal injection of 1% streptozotocin (Streptozotocin,STZ) at a dose of 30 mg / kg. The SD rats with fasting blood glucose 鈮,
本文编号:2395971
[Abstract]:[objective]: to investigate the antagonism of siglitatin (Sitagliptin,Sita) on the inflammatory response of islet 尾 cells in diabetic rats and the effect on the Keap1-Nrf2-ARE anti-inflammatory pathway and its downstream target genes. [methods] Forty male SD rats were divided into two groups. One group was fed with normal diet (NC group, 10%), the other group was fed with high fat and high sugar diet (HSFC group, 30%). After 12 weeks of fasting, rats in the control group were given a single intraperitoneal injection of 1% streptozotocin (Streptozotocin,STZ) at a dose of 30 mg / kg. The SD rats with fasting blood glucose 鈮,
本文编号:2395971
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