Objective:To explore the possible effects and mechanism of Zhizhu Decoction(ZZD)on the pathophysiology of slow transit constipation(STC).Methods A total of 54 C57BL/6 mice was randomly divided into the following 6 gro...Objective:To explore the possible effects and mechanism of Zhizhu Decoction(ZZD)on the pathophysiology of slow transit constipation(STC).Methods A total of 54 C57BL/6 mice was randomly divided into the following 6 groups by a random number table,including control,STC model(model),positive control,and low-,medium-and high-doses ZZD treatment groups(5,10,20 g/kg,namely L,M-,and H-ZZD,respectively),9 mice in each group.Following 2-week treatment,intestinal transport rate(ITR)and fecal water content were determined,and blood and colon tissue samples were collected.Hematoxylin-eosin and periodic acid-Schiff staining were performed to evaluate the morphology of colon tissues and calculate the number of goblet cells.To determine intestinal permeability,serum levels of lipopolysaccharide(LPS),low-density lipoprotein(LDL)and mannose were measured using enzyme-linked immunosorbent assay(ELISA).Western blot analysis was carried out to detect the expression levels of intestinal tight junction proteins zona-occludens-1(ZO-1),claudin-1,occludin and recombinant mucin 2(MUC2).The mRNA expression levels of inflammatory cytokines including tumor necrosis factor(TNF)-α,interleukin(IL)-1β,IL-6,IL-4,IL-10 and IL-22 were determined using reverse transcription-quantitative reverse transcription reaction.Colon indexes of oxidative stress were measured by ELISA,and protein expression levels of colon silent information regulator 1/forkhead box O transcription factor 1(SIRT1/FoxO1)antioxidant signaling pathway were detected by Western blot.Results Compared with the model group,ITR and fecal moisture were significantly enhanced in STC mice in the M-ZZD and H-ZZD groups(P<0.01).Additionally,ZZD treatment notably increased the thickness of mucosal and muscular tissue,elevated the number of goblet cells in the colon of STC mice,reduced the secretion levels of LPS,LDL and mannose,and upregulated ZO-1,claudin-1,occludin and MUC2 expressions in the colon in a dose-dependent manner,compared with the model group(P<0.05 or P<0.01).In addition,ZZD significantly attenuated intestinal inflammation and oxidative stress and activated the SIRT1/FoxO1 signaling pathway(P<0.05 or P<0.01).Conclusion ZZD exhibited beneficial effects on the intestinal system of STC mice and alleviated intestinal inflammation and oxidative stress via activating SIRT1/FoxO1 antioxidant signaling pathway in the colon.展开更多
基金Supported by the General Project of National Natural Science Foundation of China(No.82074429)。
文摘Objective:To explore the possible effects and mechanism of Zhizhu Decoction(ZZD)on the pathophysiology of slow transit constipation(STC).Methods A total of 54 C57BL/6 mice was randomly divided into the following 6 groups by a random number table,including control,STC model(model),positive control,and low-,medium-and high-doses ZZD treatment groups(5,10,20 g/kg,namely L,M-,and H-ZZD,respectively),9 mice in each group.Following 2-week treatment,intestinal transport rate(ITR)and fecal water content were determined,and blood and colon tissue samples were collected.Hematoxylin-eosin and periodic acid-Schiff staining were performed to evaluate the morphology of colon tissues and calculate the number of goblet cells.To determine intestinal permeability,serum levels of lipopolysaccharide(LPS),low-density lipoprotein(LDL)and mannose were measured using enzyme-linked immunosorbent assay(ELISA).Western blot analysis was carried out to detect the expression levels of intestinal tight junction proteins zona-occludens-1(ZO-1),claudin-1,occludin and recombinant mucin 2(MUC2).The mRNA expression levels of inflammatory cytokines including tumor necrosis factor(TNF)-α,interleukin(IL)-1β,IL-6,IL-4,IL-10 and IL-22 were determined using reverse transcription-quantitative reverse transcription reaction.Colon indexes of oxidative stress were measured by ELISA,and protein expression levels of colon silent information regulator 1/forkhead box O transcription factor 1(SIRT1/FoxO1)antioxidant signaling pathway were detected by Western blot.Results Compared with the model group,ITR and fecal moisture were significantly enhanced in STC mice in the M-ZZD and H-ZZD groups(P<0.01).Additionally,ZZD treatment notably increased the thickness of mucosal and muscular tissue,elevated the number of goblet cells in the colon of STC mice,reduced the secretion levels of LPS,LDL and mannose,and upregulated ZO-1,claudin-1,occludin and MUC2 expressions in the colon in a dose-dependent manner,compared with the model group(P<0.05 or P<0.01).In addition,ZZD significantly attenuated intestinal inflammation and oxidative stress and activated the SIRT1/FoxO1 signaling pathway(P<0.05 or P<0.01).Conclusion ZZD exhibited beneficial effects on the intestinal system of STC mice and alleviated intestinal inflammation and oxidative stress via activating SIRT1/FoxO1 antioxidant signaling pathway in the colon.
文摘目的探讨姜黄素(curcumin)调控沉默信息调节因子1(silent mating-type information regulation 2 homolog1,SIRT1)/叉头盒蛋白O1(forkhead box protein O1,FoxO1)信号通路防控非酒精性脂肪肝(nonalcoholic fatty liver disease,NAFLD)的作用及机制。方法采用脂肪酸诱导HepG2细胞24 h建立NAFLD体外模型,油红O染色后光镜下观察细胞内脂肪变性,透射电镜观察细胞内自噬体形成,比色法检测细胞内总胆固醇(totalcholesterol,TC)、甘油三酯(triglyceride,TG)含量,免疫印迹法检测细胞内沉默信息调节因子1(silent mating type information regulation2 homolog 1,SIRT1)、乙酰化叉头盒蛋白O1(acetylated forkhead box protein O1,AC-FoxO1)、微管相关蛋白1轻链3(microtubule-associated protein 1 light chain 3,LC3)、选择性自噬接头蛋白1(sequestosome 1,SQSTM1/P62)、自噬相关蛋白7(autophagyrelated protein7,ATG7)蛋白质表达,免疫荧光观察细胞内SIRT1和FoxO1蛋白质共定位。结果姜黄素可改善细胞内脂肪变性,自噬体增加,显著降低TC、TG含量及AC-FoxO1、P62蛋白质表达(P<0.01),显著升高SIRT1、ATG7蛋白质表达及LC3-Ⅱ/LC3-Ⅰ比值(P<0.01)。干扰SIRT1表达显著影响了姜黄素对细胞的保护作用及相关蛋白质的调控(P<0.05或P<0.01);姜黄素通过激活SIRT1,增强细胞中FoxO1核定位。干扰SIRT1表达,FoxOl大量迁入细胞质区,SIRT1和FoxOl共定位减少。结论姜黄素通过激活SIRT1促进FoxO1脱乙酰化,诱导自噬,改善肝细胞脂肪变性。
