目的:研究高脱氧胆酸(DCA)对肠道促炎因子IL-1β等的表达及肠道炎症的诱导作用。方法:给予小鼠添加DCA的膳食,建立小鼠肠道高DCA模型,采用HE染色观察小鼠肠道病理损伤情况;以Western Blot检测结肠组织成熟IL-1β的产生;以实时PCR检测IL-...目的:研究高脱氧胆酸(DCA)对肠道促炎因子IL-1β等的表达及肠道炎症的诱导作用。方法:给予小鼠添加DCA的膳食,建立小鼠肠道高DCA模型,采用HE染色观察小鼠肠道病理损伤情况;以Western Blot检测结肠组织成熟IL-1β的产生;以实时PCR检测IL-6、MCP-1的表达水平;通过髓过氧化物酶(MPO)活力检测肠道炎症情况。结果:给予小鼠添加0.2%DCA的膳食3个月后,其结肠长度明显缩短[对照组(8.1±0.5)cm vs DCA组(7.3±0.3)cm,P<0.01];代表肠道炎症程度的指标MPO活性显著上升[对照组(1.6±0.4)U·g^(-1)vs DCA组(3.0±0.5)U·g^(-1),P<0.01];HE染色可见结肠黏膜破损,黏膜下水肿及炎症细胞浸润。同时DCA膳食可明显诱导结肠组织成熟IL-1β的产生,并导致促炎因子IL-6(对照组1.0±0.1 vs DCA组174.6±45.9,P<0.01)及髓系趋化因子MCP-1(对照组1.0±0.1 vs DCA组187.8±26.2,P<0.001)的mRNA水平表达显著升高。结论:高水平DCA可诱导肠道炎症发生,激活炎症小体、促进成熟IL-1β产生可能是其重要作用机制之一。展开更多
Infection with Chlamydia trachomatis induces inflammatory pathologies in the urogenital tract that can lead to infertility and ectopic pregnancy. Pathogenesis of infection has been mostly attributed to excessive cytok...Infection with Chlamydia trachomatis induces inflammatory pathologies in the urogenital tract that can lead to infertility and ectopic pregnancy. Pathogenesis of infection has been mostly attributed to excessive cytokine production. However, precise mechanisms on how C. trachomatis triggers this production, and which protein（s） stimulate inflammatory cytokines remains unknown. In the present study, the C. trachomatis pORF5 protein induced tumor necrosis factor alpha （TNF-a）, interleukin-1 beta （IL-1β） and interleukin-8 （IL-8） in dose and time-dependent manners in the THP-1 human monocyte cell line. We found that intracellular p38/mitogen-activated protein kinase （MAPK） and extracellular signal-regulated kinase （ERK）/MAPK signaling pathways were required for the induction of TNF- a, IL-1β and IL-8. Blockade of toll-like receptor 2 （TLR2） signaling reduced induction levels of TNF-a, IL-8 and IL-1β. We concluded that the C. trachomatis pORF5 protein might contribute to the inflammatory processes associated with chlamydial infections.展开更多
In the present study,we aimed to evaluate the anti-inflammatory mechanism of galanthamine,a classic therapeutic drug for Alzheimer s disease(AD).The co-culture system of hippocampal nerve cell line HT-22 and microglia...In the present study,we aimed to evaluate the anti-inflammatory mechanism of galanthamine,a classic therapeutic drug for Alzheimer s disease(AD).The co-culture system of hippocampal nerve cell line HT-22 and microglial cell line BV-2 was established to observe the effect of galanthamine on the expressions of inflammatory factors induced by lipopolysaccharide(LP S).MTT method was used to observe the protective effect of galanthamine on neurons.ELISA and qPCR methods were used to detect the expressions of interleukin-β(IL-1β) and IL-1 receptor antagonist(IL-1 RA) at the protein and mRNA levels,respectively.IL-1β and IL-1 RA were evaluated by the ELISA method after pretreating with galanthamine and α7 nAChR blockerα-bungarotoxin(α-bun),mAChR blocker atropine(Atr),PI3 K inhibitor LY294002,IKKβ inhibitor SC514,or MEK inhibitor PD98059,respectively.The results showed that galanthamine significantly inhibited LPS-induced increased IL-1β and IL-1 RA expressions and maintained the ratio of IL-1β/IL-1 RA.α-Bun could block the regulatory effect of galanthamine on IL-1β and IL-1 RA.As PI3 K and NF-κB pathways were blocked,the regulatory effect of galanthamine on the IL-1β expression was significantly inhibited.Blocking PI3 K and MEK pathways could significantly inhibit the regulation of galanthamine on IL-1 RA expression.In summary,galanthamine regulated the inflammatory activity of the IL-1 subfamily to play an anti-inflammatory role mediated by α7 nAChR and PI3 K/NF-κB/MAPK pathways,which probably provided a new strategy for AD treatment.展开更多
文摘目的:研究高脱氧胆酸(DCA)对肠道促炎因子IL-1β等的表达及肠道炎症的诱导作用。方法:给予小鼠添加DCA的膳食,建立小鼠肠道高DCA模型,采用HE染色观察小鼠肠道病理损伤情况;以Western Blot检测结肠组织成熟IL-1β的产生;以实时PCR检测IL-6、MCP-1的表达水平;通过髓过氧化物酶(MPO)活力检测肠道炎症情况。结果:给予小鼠添加0.2%DCA的膳食3个月后,其结肠长度明显缩短[对照组(8.1±0.5)cm vs DCA组(7.3±0.3)cm,P<0.01];代表肠道炎症程度的指标MPO活性显著上升[对照组(1.6±0.4)U·g^(-1)vs DCA组(3.0±0.5)U·g^(-1),P<0.01];HE染色可见结肠黏膜破损,黏膜下水肿及炎症细胞浸润。同时DCA膳食可明显诱导结肠组织成熟IL-1β的产生,并导致促炎因子IL-6(对照组1.0±0.1 vs DCA组174.6±45.9,P<0.01)及髓系趋化因子MCP-1(对照组1.0±0.1 vs DCA组187.8±26.2,P<0.001)的mRNA水平表达显著升高。结论:高水平DCA可诱导肠道炎症发生,激活炎症小体、促进成熟IL-1β产生可能是其重要作用机制之一。
基金supported by the National Natural Science Foundation of China(30970165,81102230)Team Project for the Technology Innovation of Higher Education of Hunan Province,China,2010
文摘Infection with Chlamydia trachomatis induces inflammatory pathologies in the urogenital tract that can lead to infertility and ectopic pregnancy. Pathogenesis of infection has been mostly attributed to excessive cytokine production. However, precise mechanisms on how C. trachomatis triggers this production, and which protein（s） stimulate inflammatory cytokines remains unknown. In the present study, the C. trachomatis pORF5 protein induced tumor necrosis factor alpha （TNF-a）, interleukin-1 beta （IL-1β） and interleukin-8 （IL-8） in dose and time-dependent manners in the THP-1 human monocyte cell line. We found that intracellular p38/mitogen-activated protein kinase （MAPK） and extracellular signal-regulated kinase （ERK）/MAPK signaling pathways were required for the induction of TNF- a, IL-1β and IL-8. Blockade of toll-like receptor 2 （TLR2） signaling reduced induction levels of TNF-a, IL-8 and IL-1β. We concluded that the C. trachomatis pORF5 protein might contribute to the inflammatory processes associated with chlamydial infections.
基金National Natural Science Foundation of China (Grant No. 81100801)Peking Union Medical College Small-Scale Characteristic School Education Project。
文摘In the present study,we aimed to evaluate the anti-inflammatory mechanism of galanthamine,a classic therapeutic drug for Alzheimer s disease(AD).The co-culture system of hippocampal nerve cell line HT-22 and microglial cell line BV-2 was established to observe the effect of galanthamine on the expressions of inflammatory factors induced by lipopolysaccharide(LP S).MTT method was used to observe the protective effect of galanthamine on neurons.ELISA and qPCR methods were used to detect the expressions of interleukin-β(IL-1β) and IL-1 receptor antagonist(IL-1 RA) at the protein and mRNA levels,respectively.IL-1β and IL-1 RA were evaluated by the ELISA method after pretreating with galanthamine and α7 nAChR blockerα-bungarotoxin(α-bun),mAChR blocker atropine(Atr),PI3 K inhibitor LY294002,IKKβ inhibitor SC514,or MEK inhibitor PD98059,respectively.The results showed that galanthamine significantly inhibited LPS-induced increased IL-1β and IL-1 RA expressions and maintained the ratio of IL-1β/IL-1 RA.α-Bun could block the regulatory effect of galanthamine on IL-1β and IL-1 RA.As PI3 K and NF-κB pathways were blocked,the regulatory effect of galanthamine on the IL-1β expression was significantly inhibited.Blocking PI3 K and MEK pathways could significantly inhibit the regulation of galanthamine on IL-1 RA expression.In summary,galanthamine regulated the inflammatory activity of the IL-1 subfamily to play an anti-inflammatory role mediated by α7 nAChR and PI3 K/NF-κB/MAPK pathways,which probably provided a new strategy for AD treatment.
