AIM:Excessive dissolve of corneal tissue induced by MMPs which were activated by cytokins and chemokines will lead to corneal ulcer. The molecular mechanism of Lipoxin A4 (LXA4) on corneal collagen degradation in thre...AIM:Excessive dissolve of corneal tissue induced by MMPs which were activated by cytokins and chemokines will lead to corneal ulcer. The molecular mechanism of Lipoxin A4 (LXA4) on corneal collagen degradation in three dimensions was investigated. ·METHODS:Rabbit corneal fibroblasts were harvested and suspended in serum -free MEM. Type I collagen, DMEM, collagen reconstitution buffer and corneal fibroblast suspension were mixed on ice. The resultant mixture solidified in an incubator, after which test reagents and plasminogen was overlaid and the cultures were returned to the incubator. The supernatants from collagen gel incubations were collected and the amount of hydroxyproline in the hydrolysate was measured. Immunoblot analysis of MMP-1,-3 and TMMP-1,-2 was performed. MMP-2, -9 was detected by the method of Gelatin zymography. Cytotoxicity assay was measured. RESULTS:LXA4 inhibited corneal collagen degradation in a dose and time manner. LXA4 inhibited the IL -1β induced increases in the pro-MMP-1, -2, -3, -9 and active MMP -1,-2,-3,-9 in a concentration dependent manner. LXA4 also inhibited the IL-1β induced increases in TIMP-1, -2. CONCLUSION:As a potent anti-inflammation reagent, LXA4 can inhibit corneal collagen degradation induced by IL-1β in corneal fibroblasts thus inhibiting corneal dissolving pathology process.展开更多
Background： Lipoxin A4 （LXA4） can alleviate lipopolysaccharide （LPS）-induced acute lung injury （ALl） and acute respiratory distress syndrome through promoting epithelial sodium channel （ENaC） expression in lu...Background： Lipoxin A4 （LXA4） can alleviate lipopolysaccharide （LPS）-induced acute lung injury （ALl） and acute respiratory distress syndrome through promoting epithelial sodium channel （ENaC） expression in lung epithelial cells. However, how LXA4 promote ENaC expression is still largely elusive. The present study aimed to explore genes and signaling pathway involved in regulating ENaC expression induced by LXA4. Methods： A549 cells were incubated with LPS and LXA4, or in combination, and analyzed by quantitative real-time polymerase chain reaction （qRT-PCR） of ENaC-α/γ. Candidate genes affected by LXA4 were explored by transcriptome sequencing ofA549 cells. The critical candidate gene was validated by qRT-PCR and Western blot analysis ofA549 cells treated with LPS and LXA4 at different concentrations and time intervals. LXA4 receptor （ALX） inhibitor BOC-2 was used to test induction of candidate gene by LXA4. Candidate gene siRNA was adopted to analyze its influence on A549 viability and ENaC-α expression. Phosphoinositide 3-kinase （PI3K） inhibitor LY294002 was utilized to probe whether the PI3K signaling pathway was involved in LXA4 induction of candidate gene expression. Results： The A549 cell models of ALl were constrticted and subjected to transcriptome sequencing. Among candidate genes, N-myc downstream- regulated gent- 1 （NDRG 1 ） was validated by real-time-PCR and Western blot. NDRG 1 mRNA was elevated in a dose-dependent manner of LXA4, whereas BOC-2 antagonized NDRG 1 expression induced by LXA4. NDRG I siRNA suppressed viability of LPS-treated A549 cells （treatment vs. control, 0.605± 0.063 vs. 0.878 ± 0.083, P = 0.040） and ENaC-α expression （treatment vs. control, 0.458 ± 0.038 vs. 0.711 ± 0.035, P = 0.008）. LY294002 inhibited NDRG 1 （treatment vs. control, 0.459 ± 0.023 vs. 0.726 ± 0.020, P 0.001 ） and ENaC-α （treatment vs. control, 0.236 ± 0.021 vs. 0.814 ±0.025, P 〈 0.001 ） expressions and serum- and glucocorticoid-inducible kinase I phosphorylation （treatment vs. control, 0.442± 0.024 vs. 1.046 ± 0.082, P = 0.002）, indicating the PI3K signaling pathway was involved in regulating NDRG 1 expression induced by LXA4. Conclusion： Our research uncovered a critical role of NDRG1 in LXA4 alleviation of LPS-induced A549 cell injury through mediating PI3K signaling to restore ENaC expression.展开更多
目的观察脂氧素A4 (LXA4)对异氟烷麻醉诱发老龄大鼠促炎因子释放及认知功能障碍的影响。方法将120只雄性SD大鼠随机分成对照组(C组)、异氟烷组(I组)、LXA4+异氟烷组(L+I组)和LXA4组(L组)(n=30)。异氟烷麻醉开始前,L组和L+I组脑室注射0.3...目的观察脂氧素A4 (LXA4)对异氟烷麻醉诱发老龄大鼠促炎因子释放及认知功能障碍的影响。方法将120只雄性SD大鼠随机分成对照组(C组)、异氟烷组(I组)、LXA4+异氟烷组(L+I组)和LXA4组(L组)(n=30)。异氟烷麻醉开始前,L组和L+I组脑室注射0.3 nmol·L-1LXA4 5μL,C组和I组脑室注射等量0.9%氯化钠溶液。C组和L组大鼠以30%O2-70%N2混合气体处理6 h,I组和L+I组大鼠以1.4%异氟烷处理6 h。麻醉结束后测定动脉血气及血糖,麻醉后0,3,6,12和24 h监测海马肿瘤坏死因子α(TNF-α)、白细胞介素6(IL-6)、白细胞介素1β(IL-1β)和核因子κB抑制因子α(IκBα)表达,每次5只。其余大鼠完全清醒后,饲养至麻醉后2周,Morris水迷宫实验检测空间学习和记忆能力,分离海马,Western Blotting检测IκBα表达水平。结果与C组比较,I组麻醉后0,3,6 h IL-1β和IL-6表达明显上调(P<0.05);麻醉后0,3,6,12 h TNF-α表达明显上调(P<0.05);麻醉后0,3,6 h IκBα表达下调(P<0.05)。与I组比较,L+I组麻醉后0,3,6 h TNF-α、IL-1β和IL-6表达下调,IκBα表达上调(P<0.05)。水迷宫实验训练第3天和第4天,与I组比较,L+I组大鼠定位平台时间缩短,在目标象限的时间百分比更高(P<0.05)。结论 LXA4可改善异氟烷麻醉所致的老年大鼠学习记忆功能障碍,其机制可能与抑制老年大鼠海马促炎因子释放有关。展开更多
目的探讨脂氧素A4（LipoxinA4，LXA4）对脂多糖（lipopolysaccharide，LPS）攻击的大鼠肺泡Ⅱ型上皮细胞（alveolar type Ⅱ penumonoeyte，ATⅡ）水通道蛋白（aquapofin，AQP）5的影响。方法对大鼠ATⅡ细胞进行分离、纯化，以1μg／mL...目的探讨脂氧素A4（LipoxinA4，LXA4）对脂多糖（lipopolysaccharide，LPS）攻击的大鼠肺泡Ⅱ型上皮细胞（alveolar type Ⅱ penumonoeyte，ATⅡ）水通道蛋白（aquapofin，AQP）5的影响。方法对大鼠ATⅡ细胞进行分离、纯化，以1μg／mL的LPS刺激ATⅡ4h建立LPS攻击ATⅡ细胞模型。将ATⅡ随机分为：空白对照（无血清的培养基不含任何药物）组；溶剂对照（乙醇，0．7μL／mL）组；LPS（1μg／mL）组；LXA4（1×10^-7mol／mL）组；LPS＋LXA4组。用逆转录聚合酶链反应法（RT-PCR）检测大鼠ATⅡ中AQP5的信使核糖核酸（mRNA）的变化，免疫组织化学方法（IHC）检测ATⅡ中AQP5蛋白表达。结果1μg／mL的LPS刺激ATⅡ4h后，ATⅡ中AQP5的mRNA和蛋白表达较空白组明显减低（P〈0．01），而LPS＋LXA4组ATⅡ中AQP5的mRNA和蛋白表达较LPS组明显增高（P〈0．01），且LXA4组ATⅡ中AQP5的mRNA和蛋白表达较空白组也明显增高（P〈0．01）。结论大鼠ATⅡ上表达有AQP5，LXA4能促进AQP5mRNA和蛋白表达上调，提示LXA4可能通过上调AQP5的表达起到促进肺泡水肿液清除作用。展开更多
基金Jilin University Basic Scientific Research Operating Expenses Fund, China (Research Fund of the Bethune B Plan of Jilin University, 2012 No.2012230)Research Fund of Jilin Provincial Science and Technology Department, China (international cooperation item, No.20120726)
文摘AIM:Excessive dissolve of corneal tissue induced by MMPs which were activated by cytokins and chemokines will lead to corneal ulcer. The molecular mechanism of Lipoxin A4 (LXA4) on corneal collagen degradation in three dimensions was investigated. ·METHODS:Rabbit corneal fibroblasts were harvested and suspended in serum -free MEM. Type I collagen, DMEM, collagen reconstitution buffer and corneal fibroblast suspension were mixed on ice. The resultant mixture solidified in an incubator, after which test reagents and plasminogen was overlaid and the cultures were returned to the incubator. The supernatants from collagen gel incubations were collected and the amount of hydroxyproline in the hydrolysate was measured. Immunoblot analysis of MMP-1,-3 and TMMP-1,-2 was performed. MMP-2, -9 was detected by the method of Gelatin zymography. Cytotoxicity assay was measured. RESULTS:LXA4 inhibited corneal collagen degradation in a dose and time manner. LXA4 inhibited the IL -1β induced increases in the pro-MMP-1, -2, -3, -9 and active MMP -1,-2,-3,-9 in a concentration dependent manner. LXA4 also inhibited the IL-1β induced increases in TIMP-1, -2. CONCLUSION:As a potent anti-inflammation reagent, LXA4 can inhibit corneal collagen degradation induced by IL-1β in corneal fibroblasts thus inhibiting corneal dissolving pathology process.
文摘Background： Lipoxin A4 （LXA4） can alleviate lipopolysaccharide （LPS）-induced acute lung injury （ALl） and acute respiratory distress syndrome through promoting epithelial sodium channel （ENaC） expression in lung epithelial cells. However, how LXA4 promote ENaC expression is still largely elusive. The present study aimed to explore genes and signaling pathway involved in regulating ENaC expression induced by LXA4. Methods： A549 cells were incubated with LPS and LXA4, or in combination, and analyzed by quantitative real-time polymerase chain reaction （qRT-PCR） of ENaC-α/γ. Candidate genes affected by LXA4 were explored by transcriptome sequencing ofA549 cells. The critical candidate gene was validated by qRT-PCR and Western blot analysis ofA549 cells treated with LPS and LXA4 at different concentrations and time intervals. LXA4 receptor （ALX） inhibitor BOC-2 was used to test induction of candidate gene by LXA4. Candidate gene siRNA was adopted to analyze its influence on A549 viability and ENaC-α expression. Phosphoinositide 3-kinase （PI3K） inhibitor LY294002 was utilized to probe whether the PI3K signaling pathway was involved in LXA4 induction of candidate gene expression. Results： The A549 cell models of ALl were constrticted and subjected to transcriptome sequencing. Among candidate genes, N-myc downstream- regulated gent- 1 （NDRG 1 ） was validated by real-time-PCR and Western blot. NDRG 1 mRNA was elevated in a dose-dependent manner of LXA4, whereas BOC-2 antagonized NDRG 1 expression induced by LXA4. NDRG I siRNA suppressed viability of LPS-treated A549 cells （treatment vs. control, 0.605± 0.063 vs. 0.878 ± 0.083, P = 0.040） and ENaC-α expression （treatment vs. control, 0.458 ± 0.038 vs. 0.711 ± 0.035, P = 0.008）. LY294002 inhibited NDRG 1 （treatment vs. control, 0.459 ± 0.023 vs. 0.726 ± 0.020, P 0.001 ） and ENaC-α （treatment vs. control, 0.236 ± 0.021 vs. 0.814 ±0.025, P 〈 0.001 ） expressions and serum- and glucocorticoid-inducible kinase I phosphorylation （treatment vs. control, 0.442± 0.024 vs. 1.046 ± 0.082, P = 0.002）, indicating the PI3K signaling pathway was involved in regulating NDRG 1 expression induced by LXA4. Conclusion： Our research uncovered a critical role of NDRG1 in LXA4 alleviation of LPS-induced A549 cell injury through mediating PI3K signaling to restore ENaC expression.
文摘目的观察脂氧素A4 (LXA4)对异氟烷麻醉诱发老龄大鼠促炎因子释放及认知功能障碍的影响。方法将120只雄性SD大鼠随机分成对照组(C组)、异氟烷组(I组)、LXA4+异氟烷组(L+I组)和LXA4组(L组)(n=30)。异氟烷麻醉开始前,L组和L+I组脑室注射0.3 nmol·L-1LXA4 5μL,C组和I组脑室注射等量0.9%氯化钠溶液。C组和L组大鼠以30%O2-70%N2混合气体处理6 h,I组和L+I组大鼠以1.4%异氟烷处理6 h。麻醉结束后测定动脉血气及血糖,麻醉后0,3,6,12和24 h监测海马肿瘤坏死因子α(TNF-α)、白细胞介素6(IL-6)、白细胞介素1β(IL-1β)和核因子κB抑制因子α(IκBα)表达,每次5只。其余大鼠完全清醒后,饲养至麻醉后2周,Morris水迷宫实验检测空间学习和记忆能力,分离海马,Western Blotting检测IκBα表达水平。结果与C组比较,I组麻醉后0,3,6 h IL-1β和IL-6表达明显上调(P<0.05);麻醉后0,3,6,12 h TNF-α表达明显上调(P<0.05);麻醉后0,3,6 h IκBα表达下调(P<0.05)。与I组比较,L+I组麻醉后0,3,6 h TNF-α、IL-1β和IL-6表达下调,IκBα表达上调(P<0.05)。水迷宫实验训练第3天和第4天,与I组比较,L+I组大鼠定位平台时间缩短,在目标象限的时间百分比更高(P<0.05)。结论 LXA4可改善异氟烷麻醉所致的老年大鼠学习记忆功能障碍,其机制可能与抑制老年大鼠海马促炎因子释放有关。
文摘目的探讨脂氧素A4（LipoxinA4，LXA4）对脂多糖（lipopolysaccharide，LPS）攻击的大鼠肺泡Ⅱ型上皮细胞（alveolar type Ⅱ penumonoeyte，ATⅡ）水通道蛋白（aquapofin，AQP）5的影响。方法对大鼠ATⅡ细胞进行分离、纯化，以1μg／mL的LPS刺激ATⅡ4h建立LPS攻击ATⅡ细胞模型。将ATⅡ随机分为：空白对照（无血清的培养基不含任何药物）组；溶剂对照（乙醇，0．7μL／mL）组；LPS（1μg／mL）组；LXA4（1×10^-7mol／mL）组；LPS＋LXA4组。用逆转录聚合酶链反应法（RT-PCR）检测大鼠ATⅡ中AQP5的信使核糖核酸（mRNA）的变化，免疫组织化学方法（IHC）检测ATⅡ中AQP5蛋白表达。结果1μg／mL的LPS刺激ATⅡ4h后，ATⅡ中AQP5的mRNA和蛋白表达较空白组明显减低（P〈0．01），而LPS＋LXA4组ATⅡ中AQP5的mRNA和蛋白表达较LPS组明显增高（P〈0．01），且LXA4组ATⅡ中AQP5的mRNA和蛋白表达较空白组也明显增高（P〈0．01）。结论大鼠ATⅡ上表达有AQP5，LXA4能促进AQP5mRNA和蛋白表达上调，提示LXA4可能通过上调AQP5的表达起到促进肺泡水肿液清除作用。
