西格列汀拮抗糖尿病胰島β細胞炎癥反應(yīng)及與Keap1-Nrf2-ARE通路的關(guān)系
發(fā)布時間:2018-12-30 18:32
【摘要】:【目的】:探討西格列汀(Sitagliptin,Sita)對糖尿病大鼠胰島β細胞炎癥反應(yīng)的拮抗作用,對Keap1-Nrf2-ARE抗炎通路及其下游靶基因的影響。【方法】:將40只雄性SD大鼠分為兩組,一組給予正常飼料喂養(yǎng)(NC組,n=10),一組給予高脂高糖飼料喂養(yǎng)(HSFC組,n=30)。8周后禁食12h,HSFC組大鼠一次性腹腔注射1%鏈脲佐菌素(Streptozotocin,STZ),劑量為30mg/kg,將空腹血糖連續(xù)三天≥16.7mmol/L的SD大鼠定為糖尿病大鼠。從中隨機挑選20只,隨機分為糖尿病組(DM組,n=10)和西格列汀干預組(Sita組,,n=10),Sita組給予西格列汀灌胃,劑量100mg/kg/d,NC組及DM組給予等量生理鹽水灌胃。于第0、4、8、12、16、20周末測量體重和空腹血糖;第0、20周行胰島素耐量實驗(ITT)和腹腔注射葡萄糖耐量試驗(IPGTT);對各組大鼠胰腺組織進行HE染色,觀察組織形態(tài)學改變;進行熒光定量PCR(Q-PCR)及Western Blot檢測胰腺中炎癥因子Toll樣受體4(TLR4)、轉(zhuǎn)錄因子核因子(NF-κB)及Keap1-Nrf2-ARE通路相關(guān)基因核因子E2相關(guān)因子(Nrf2)、Kelch樣ECH相關(guān)蛋白1(Keap1)、血紅素加氧酶-1(HO-1)的mRNA及蛋白的表達!窘Y(jié)果】:1、Sita干預8周后,Sita組空腹血糖明顯低于DM組,差別有統(tǒng)計學意義(P0.05);DM組體重較NC組明顯下降,差別有統(tǒng)計學意義(P0.05);Sita組較DM組體重差別無統(tǒng)計學意義(P0.05)。2、Sita干預20周后,Sita組空腹血糖明顯低于DM組,差別有統(tǒng)計學意義(P0.05);Sita組較DM組體重差別無統(tǒng)計學意義(P0.05);Sita組IPGTT、ITT的曲線下面積比DM組明顯降低,差別有統(tǒng)計學意義(P0.05)。3、DM組胰島數(shù)量明顯減少,且胰島細胞球體積明顯縮小;經(jīng)Sita干預后的糖尿病大鼠胰腺組織胰島數(shù)量無明顯減少,胰島球體積縮小。4、DM組TLR4、NF-κB、Nrf2、Keap1、HO-1mRNA及蛋白表達與NC組相比明顯增高,差異有統(tǒng)計學意義(P0.05);而Sita組TLR4、NF-κB、Nrf2、Keap1、HO-1mRNA和蛋白表達較DM組明顯減低,差異有統(tǒng)計學意義(P0.05)!窘Y(jié)論】:1、Sita能在不影響體重的情況下降低糖尿病大鼠的血糖,改善胰島素抵抗。2、Sita減少糖尿病胰腺組織中胰島的破壞,胰島β細胞的凋亡。3、Sita通過抑制炎癥通路TLR4/NF-κB的表達對糖尿病大鼠胰島β細胞起抗炎作用。4、Sita通過抑制Nrf2-Keap1-ARE體系改善胰島素抵抗,促進胰島β細胞分泌胰島素,且作用機制都跟其具有抗炎作用密切相關(guān)。
[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,
本文編號: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,
本文編號:2395971
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