Inflammatory bowel disease （IBD） is an important factor in the induction of colon cancer, but its mechanism is unclear. Colitis and colitis-associated colorectal cancer （CAC） models induced using both dextran sulf...Inflammatory bowel disease （IBD） is an important factor in the induction of colon cancer, but its mechanism is unclear. Colitis and colitis-associated colorectal cancer （CAC） models induced using both dextran sulfate sodium （DSS） and the azoxymethane/DSS protocol were established in wild-type （WT） and CTRP4 transgenic （CTRP4-tg） C57BL6/J mice. Body weight, stool consistency and the presence of blood in the stool were analyzed; tumor quantity, size and histological characteristics were analyzed during the development of CAC. The CTRP4-tg mice exhibited significantly reduced colitis and developed far fewer macroscopic tumors; these tumors were smaller in size, and a majority of the colon tumors in these mice were restricted to the superficial mucosa. Tumors of lower grades were observed in the CTRP4-tg mice. Interleukin-6 was markedly downregulated in the CTRP4-tg mice during CAC tumorigenesis. The phosphorylation of ERK, signal transducer and activator of transcription 3 and Akt in the colon and the proliferation of intestinal epithelial cells were decreased in the CTRP4-tg mice. The injection of recombinant CTRP4 protein significantly reduced the colitis symptoms of the WT mice. CTRP4 plays an important role in inflammation and inflammation-associated colon tumorigenesis, and our research may provide a novel method for the treatment of IBD and CAC.展开更多
文摘目的探讨C1q和肿瘤坏死因子相关蛋白4(CTRP4)对子痫前期大鼠胎盘滋养层细胞的影响。方法构建子痫前期大鼠模型,采集正常孕鼠和模型大鼠胎盘滋养层组织,运用实时定量PCR和Western blot法检测CTRP4、白细胞介素1β(IL-1β)和caspase-1 mRNA和蛋白表达水平;分离培养正常孕鼠和模型鼠滋养层细胞,在不同时间点,运用流式细胞术检测碘化丙啶和caspase-1双阳性(PI+caspase-1+)细胞(pyroptosis),运用实时定量PCR和Western blot法检测IL-1β和caspase-1表达水平;在模型大鼠滋养层细胞培养基中分别加入(0.5、5、15、25、50)ng/m L CTRP4重组蛋白或(10、20)ng/m L CTRP4蛋白中和抗体,处理72 h后检测pyroptosis细胞数目和caspase-1、IL-1β水平。结果子痫前期大鼠胎盘滋养层组织caspase-1、IL-1β表达增强,CTRP4表达水平下调;CTRP4重组蛋白处理体外培养的大鼠滋养层细胞可显著减少PI+caspase-1+细胞数量并降低caspase-1、IL-1β水平,而CTRP4蛋白中和抗体处理显著增加PI+caspase-1+细胞数量并增强炎症反应。结论 CTRP4可显著抑制caspase-1/IL-1β炎症调节通路的活性,并抑制子娴前期大鼠胎盘滋养层细胞的pyroptosis。
文摘Inflammatory bowel disease （IBD） is an important factor in the induction of colon cancer, but its mechanism is unclear. Colitis and colitis-associated colorectal cancer （CAC） models induced using both dextran sulfate sodium （DSS） and the azoxymethane/DSS protocol were established in wild-type （WT） and CTRP4 transgenic （CTRP4-tg） C57BL6/J mice. Body weight, stool consistency and the presence of blood in the stool were analyzed; tumor quantity, size and histological characteristics were analyzed during the development of CAC. The CTRP4-tg mice exhibited significantly reduced colitis and developed far fewer macroscopic tumors; these tumors were smaller in size, and a majority of the colon tumors in these mice were restricted to the superficial mucosa. Tumors of lower grades were observed in the CTRP4-tg mice. Interleukin-6 was markedly downregulated in the CTRP4-tg mice during CAC tumorigenesis. The phosphorylation of ERK, signal transducer and activator of transcription 3 and Akt in the colon and the proliferation of intestinal epithelial cells were decreased in the CTRP4-tg mice. The injection of recombinant CTRP4 protein significantly reduced the colitis symptoms of the WT mice. CTRP4 plays an important role in inflammation and inflammation-associated colon tumorigenesis, and our research may provide a novel method for the treatment of IBD and CAC.
