BACKGROUND: Notch-1/NF-κB signaling plays a key role in the cecal ligation and puncture(CLP)-induced sepsis. This study aims to investigate the intervention effects of microRNA-34a(miR-34a) lentivirus regulating Notc...BACKGROUND: Notch-1/NF-κB signaling plays a key role in the cecal ligation and puncture(CLP)-induced sepsis. This study aims to investigate the intervention effects of microRNA-34a(miR-34a) lentivirus regulating Notch-1/NF-κB signaling pathway on lipopolysaccharide(LPS)-induced human umbilical vein endothelial cells(HUVEC).METHODS: HUVEC were divided into four groups as the following: they were infected with negative control lentivirus(NC group) or miR-34a lentivirus(OE group); LPS(1 g/mL) was added on the third day on the basis of NC group and OE group for 24 hours(NC+LPS group or OE+LPS group). The levels of TNF-α, IL-1β, IL-6, and IL-10 in the cell supernatants, and the mRNA and protein expression of Notch-1 and NF-κB in the HUVEC were evaluated.RESULTS: After 24 hours, the levels of TNF-α, IL-1β, IL-6 in the cell supernatants and the protein expression of NF-κB from NC+LPS group were significantly higher than those of NC group, but IL-10 level and the protein expression of Notch-1 in NC+LPS group were the opposite. After intervention of miR-34a lentivirus, the cell supernatants TNF-α and the protein expression of NF-κB in OE+LPS group after 24 hours markedly decreased compared to NC+LPS group. While the cell supernatants IL-1β and IL-6 and the mRNA expression of NF-κB slightly decreased in OE+LPS group, IL-10 and the mRNA and protein expression of Notch-1 were the opposite.CONCLUSION: miR-34a regulating Notch-1/NF-κB signaling pathway can reduce the HUVEC damage caused by LPS stimulation.展开更多
目的研究紫草素对Ha Ca T细胞抑制增殖的作用及其作用机制。方法倒置显微镜下观察不同浓度紫草素(0、2、5、10、15μmol/L)作用后Ha Ca T细胞的形态学改变;MTT法检测紫草素对Ha Ca T细胞抑制增殖的作用;流式细胞术检测细胞凋亡率变化;We...目的研究紫草素对Ha Ca T细胞抑制增殖的作用及其作用机制。方法倒置显微镜下观察不同浓度紫草素(0、2、5、10、15μmol/L)作用后Ha Ca T细胞的形态学改变;MTT法检测紫草素对Ha Ca T细胞抑制增殖的作用;流式细胞术检测细胞凋亡率变化;Western blot法检测Notch-1、Jagged1和Hes5蛋白的表达情况。RT-PCR检测下游信号分子Hes1和Hes5的m RNA表达。结果 10μmol/L紫草素即可显著抑制Ha Ca T细胞的增殖,且随着浓度的增加,紫草素呈剂量依赖性地抑制Ha Ca T细胞的增殖(均P<0.01)。流式细胞术检测结果显示10μmol/L紫草素能够显著诱导Ha Ca T细胞凋亡(P<0.01)。Western bolt法检测结果显示,Notch-1、Jagged1和Hes5蛋白表达逐渐降低。RT-PCR法检测结果显示,Notch信号通路下游信号分子Hes1和Hes5的m RNA表达水平亦呈剂量依赖性降低。结论紫草素呈剂量依赖性地抑制Ha Ca T细胞的增殖,并诱导细胞凋亡,Notch-1信号通路在其中起了重要作用。展开更多
Malignant neoplasms of the appendix are rare and represent less than 1% of gastrointestinal cancers.Goblet cell carcinoids(GCC) tumors are a distinctive group of heterogeneous appendiceal neoplasm that exhibit unique ...Malignant neoplasms of the appendix are rare and represent less than 1% of gastrointestinal cancers.Goblet cell carcinoids(GCC) tumors are a distinctive group of heterogeneous appendiceal neoplasm that exhibit unique clinical and pathologic features.This review focuses on the current diagnostic procedures,pathogenesis,possible signaling mechanisms and treatment options for GCC.Perspectives for future research are discussed.The tumor likely arises from pluripotent intestinal epithelial crypt base stem cells.Previous findings of Notch signaling as a tumor suppressor in Neuroendocrine tumors may have a similar role in this tumor too.Loss of Notch signaling may be the driver mutation with other successive downstream mutations likely favors them into progressing and behavior similar to poorly differentiated adenocarcinoma with minimal neuroendocrine differentiation.A multidisciplinary approach is suggested for optimal outcomes.Surgery remains the main treatment modality.Simple appendectomy may be sufficient in early stages while right hemicolectomy is recommended for advanced tumors.Cytoreductive surgery with heated intraperitoneal chemotherapy may improve survival in a select few with metastatic peritoneal disease.These tumors have an unpredictable behavior even in early stages and local recurrence and delayed metastases may be seen.Lifelong surveillance is warranted.展开更多
This study examined the effect of Notch-1 signaling on malignant behaviors of breast cancer cells by regulating breast cancer stem cells （BCSCs）. BCSCs were enriched by using serum-free me- dium and knocked out of N...This study examined the effect of Notch-1 signaling on malignant behaviors of breast cancer cells by regulating breast cancer stem cells （BCSCs）. BCSCs were enriched by using serum-free me- dium and knocked out of Notch-1 by using a lentiviral vector. Real-time polymerase chain reaction （RT-PCR） and Western blotting were used to detect the Notch-1 expression levels in breast cancer cell lines and BCSCs, and fl0w cytometry to detect the proportion of BCSCs in BCSC spheres. The BCSC self-renewal, migration, invasion, and tumorigenicity were examined by the tumor microsphere-forming assay and transwell assay and after xenotransplantation. The results showed that the Notch-1 silencing reduced the number of BCSC spheres, the proportion of BCSCs, and the number of cells penetrating through the transwell membrane. It also decreased the size of tumors that were implanted in the nude mice. These results suggest that Notch-1 signaling is intimately linked to the behaviors of BCSCs. Blocking Notch-1 signaling can inhibit the malignant behaviors of BCSCs, which may provide a prom- ising therapeutical approach for breast cancer.展开更多
基金supported by a grant from Natural Science Foundation of Zhejiang Province of China(LY14H150003)
文摘BACKGROUND: Notch-1/NF-κB signaling plays a key role in the cecal ligation and puncture(CLP)-induced sepsis. This study aims to investigate the intervention effects of microRNA-34a(miR-34a) lentivirus regulating Notch-1/NF-κB signaling pathway on lipopolysaccharide(LPS)-induced human umbilical vein endothelial cells(HUVEC).METHODS: HUVEC were divided into four groups as the following: they were infected with negative control lentivirus(NC group) or miR-34a lentivirus(OE group); LPS(1 g/mL) was added on the third day on the basis of NC group and OE group for 24 hours(NC+LPS group or OE+LPS group). The levels of TNF-α, IL-1β, IL-6, and IL-10 in the cell supernatants, and the mRNA and protein expression of Notch-1 and NF-κB in the HUVEC were evaluated.RESULTS: After 24 hours, the levels of TNF-α, IL-1β, IL-6 in the cell supernatants and the protein expression of NF-κB from NC+LPS group were significantly higher than those of NC group, but IL-10 level and the protein expression of Notch-1 in NC+LPS group were the opposite. After intervention of miR-34a lentivirus, the cell supernatants TNF-α and the protein expression of NF-κB in OE+LPS group after 24 hours markedly decreased compared to NC+LPS group. While the cell supernatants IL-1β and IL-6 and the mRNA expression of NF-κB slightly decreased in OE+LPS group, IL-10 and the mRNA and protein expression of Notch-1 were the opposite.CONCLUSION: miR-34a regulating Notch-1/NF-κB signaling pathway can reduce the HUVEC damage caused by LPS stimulation.
文摘目的研究紫草素对Ha Ca T细胞抑制增殖的作用及其作用机制。方法倒置显微镜下观察不同浓度紫草素(0、2、5、10、15μmol/L)作用后Ha Ca T细胞的形态学改变;MTT法检测紫草素对Ha Ca T细胞抑制增殖的作用;流式细胞术检测细胞凋亡率变化;Western blot法检测Notch-1、Jagged1和Hes5蛋白的表达情况。RT-PCR检测下游信号分子Hes1和Hes5的m RNA表达。结果 10μmol/L紫草素即可显著抑制Ha Ca T细胞的增殖,且随着浓度的增加,紫草素呈剂量依赖性地抑制Ha Ca T细胞的增殖(均P<0.01)。流式细胞术检测结果显示10μmol/L紫草素能够显著诱导Ha Ca T细胞凋亡(P<0.01)。Western bolt法检测结果显示,Notch-1、Jagged1和Hes5蛋白表达逐渐降低。RT-PCR法检测结果显示,Notch信号通路下游信号分子Hes1和Hes5的m RNA表达水平亦呈剂量依赖性降低。结论紫草素呈剂量依赖性地抑制Ha Ca T细胞的增殖,并诱导细胞凋亡,Notch-1信号通路在其中起了重要作用。
文摘Malignant neoplasms of the appendix are rare and represent less than 1% of gastrointestinal cancers.Goblet cell carcinoids(GCC) tumors are a distinctive group of heterogeneous appendiceal neoplasm that exhibit unique clinical and pathologic features.This review focuses on the current diagnostic procedures,pathogenesis,possible signaling mechanisms and treatment options for GCC.Perspectives for future research are discussed.The tumor likely arises from pluripotent intestinal epithelial crypt base stem cells.Previous findings of Notch signaling as a tumor suppressor in Neuroendocrine tumors may have a similar role in this tumor too.Loss of Notch signaling may be the driver mutation with other successive downstream mutations likely favors them into progressing and behavior similar to poorly differentiated adenocarcinoma with minimal neuroendocrine differentiation.A multidisciplinary approach is suggested for optimal outcomes.Surgery remains the main treatment modality.Simple appendectomy may be sufficient in early stages while right hemicolectomy is recommended for advanced tumors.Cytoreductive surgery with heated intraperitoneal chemotherapy may improve survival in a select few with metastatic peritoneal disease.These tumors have an unpredictable behavior even in early stages and local recurrence and delayed metastases may be seen.Lifelong surveillance is warranted.
基金supported by the National Nature Science Foundation of China(No.30972935)
文摘This study examined the effect of Notch-1 signaling on malignant behaviors of breast cancer cells by regulating breast cancer stem cells （BCSCs）. BCSCs were enriched by using serum-free me- dium and knocked out of Notch-1 by using a lentiviral vector. Real-time polymerase chain reaction （RT-PCR） and Western blotting were used to detect the Notch-1 expression levels in breast cancer cell lines and BCSCs, and fl0w cytometry to detect the proportion of BCSCs in BCSC spheres. The BCSC self-renewal, migration, invasion, and tumorigenicity were examined by the tumor microsphere-forming assay and transwell assay and after xenotransplantation. The results showed that the Notch-1 silencing reduced the number of BCSC spheres, the proportion of BCSCs, and the number of cells penetrating through the transwell membrane. It also decreased the size of tumors that were implanted in the nude mice. These results suggest that Notch-1 signaling is intimately linked to the behaviors of BCSCs. Blocking Notch-1 signaling can inhibit the malignant behaviors of BCSCs, which may provide a prom- ising therapeutical approach for breast cancer.
