目的从动物和细胞两个层面探讨趋化因子配体7[chemokine(C-X-C motif)ligand 7,CXCL7]/趋化因子受体2(CXCR2)轴在肥胖相关认知功能障碍中的作用机制。方法高脂饮食诱导的肥胖模型(diet-induced obesity,DIO),采用新物体识别实验检测认...目的从动物和细胞两个层面探讨趋化因子配体7[chemokine(C-X-C motif)ligand 7,CXCL7]/趋化因子受体2(CXCR2)轴在肥胖相关认知功能障碍中的作用机制。方法高脂饮食诱导的肥胖模型(diet-induced obesity,DIO),采用新物体识别实验检测认知水平;免疫荧光染色法观察海马小胶质细胞、星形胶质细胞的活化水平以及小鼠突触后密度蛋白95(postsynaptic density protein 95,PSD95)的含量。采用ELISA法测定海马组织CXCL7的含量;高尔基染色法测定海马神经元树突棘密度。其次,分别使用重组小鼠CXCL7和干扰CXCR2表达的si-RNA处理HT22小鼠海马神经元细胞系。用细胞免疫荧光染色法观察HT22细胞的CXCL7和PSD95的表达水平。结果与Ctrl组小鼠比较,DIO组小鼠在新物体识别实验中的辨别指数明显降低;伴有海马小胶质细胞、星形胶质细胞的活化水平明显升高,PSD95的含量减少,神经元的树突棘密度降低,CXCL7的含量明显升高。与DIO组小鼠相比,AWL组小鼠在新物体识别实验中的辨别指数明显升高。与Ctrl组细胞比,Ctrl+CXCL7组的PSD95水平降低;与Ctrl+CXCL7组细胞比,si-CXCR2+CXCL7组的PSD95水平升高。结论高脂饮食诱导肥胖小鼠的中枢神经炎症,进而引起认知功能障碍,可能是与CXCL7/CXCR2轴介导的突触可塑性改变有关。展开更多
IL-6 is a multifunctional cytokine and involved in variety of carcinogenesis. However, the association between IL-6 and sporadic colorectal cancer has not been fully explained. Here, we investigated the role of IL-6 s...IL-6 is a multifunctional cytokine and involved in variety of carcinogenesis. However, the association between IL-6 and sporadic colorectal cancer has not been fully explained. Here, we investigated the role of IL-6 signaling and the cytokine network in sporadic colorectal cancer. We investigated the serum IL-6 levels in patients with sporadic colorectal adenoma, cancer patients, and normal controls. In addition, the expressions of IL-6, gp130, and the IL-6 receptor subunit were investigated in biopsy specimens collected from these subjects. Furthermore, the expressions of CXCL7 and CXCR2, a chemokine and its receptor involved in IL-6 production, were also investigated. We observed an elevated level of serum IL-6 in colorectal cancer patients and an increased expression of IL-6 in colorectal cancer tissues, compared with the levels in a control group and in patients with adenoma. The phosphorylation of gp130 was also increased in the colorectal cancer tissues, compared with that in control and adenoma tissues. The expressions of CXCL7 and CXCR2 in the colorectal cancer tissues were also higher than those in control and adenoma tissues. IL-6 signaling is involved in sporadic colorectal cancer. In addition, the increased expressions of CXCL7 and CXCR2 might, in turn, increase the expression of IL-6 in colorectal cancer. Further studies are required to elucidate the function of the IL-6 signaling and the cytokine network in sporadic colorectal cancer.展开更多
文摘目的从动物和细胞两个层面探讨趋化因子配体7[chemokine(C-X-C motif)ligand 7,CXCL7]/趋化因子受体2(CXCR2)轴在肥胖相关认知功能障碍中的作用机制。方法高脂饮食诱导的肥胖模型(diet-induced obesity,DIO),采用新物体识别实验检测认知水平;免疫荧光染色法观察海马小胶质细胞、星形胶质细胞的活化水平以及小鼠突触后密度蛋白95(postsynaptic density protein 95,PSD95)的含量。采用ELISA法测定海马组织CXCL7的含量;高尔基染色法测定海马神经元树突棘密度。其次,分别使用重组小鼠CXCL7和干扰CXCR2表达的si-RNA处理HT22小鼠海马神经元细胞系。用细胞免疫荧光染色法观察HT22细胞的CXCL7和PSD95的表达水平。结果与Ctrl组小鼠比较,DIO组小鼠在新物体识别实验中的辨别指数明显降低;伴有海马小胶质细胞、星形胶质细胞的活化水平明显升高,PSD95的含量减少,神经元的树突棘密度降低,CXCL7的含量明显升高。与DIO组小鼠相比,AWL组小鼠在新物体识别实验中的辨别指数明显升高。与Ctrl组细胞比,Ctrl+CXCL7组的PSD95水平降低;与Ctrl+CXCL7组细胞比,si-CXCR2+CXCL7组的PSD95水平升高。结论高脂饮食诱导肥胖小鼠的中枢神经炎症,进而引起认知功能障碍,可能是与CXCL7/CXCR2轴介导的突触可塑性改变有关。
文摘IL-6 is a multifunctional cytokine and involved in variety of carcinogenesis. However, the association between IL-6 and sporadic colorectal cancer has not been fully explained. Here, we investigated the role of IL-6 signaling and the cytokine network in sporadic colorectal cancer. We investigated the serum IL-6 levels in patients with sporadic colorectal adenoma, cancer patients, and normal controls. In addition, the expressions of IL-6, gp130, and the IL-6 receptor subunit were investigated in biopsy specimens collected from these subjects. Furthermore, the expressions of CXCL7 and CXCR2, a chemokine and its receptor involved in IL-6 production, were also investigated. We observed an elevated level of serum IL-6 in colorectal cancer patients and an increased expression of IL-6 in colorectal cancer tissues, compared with the levels in a control group and in patients with adenoma. The phosphorylation of gp130 was also increased in the colorectal cancer tissues, compared with that in control and adenoma tissues. The expressions of CXCL7 and CXCR2 in the colorectal cancer tissues were also higher than those in control and adenoma tissues. IL-6 signaling is involved in sporadic colorectal cancer. In addition, the increased expressions of CXCL7 and CXCR2 might, in turn, increase the expression of IL-6 in colorectal cancer. Further studies are required to elucidate the function of the IL-6 signaling and the cytokine network in sporadic colorectal cancer.
