A pH-responsive polymer Eudragit S-100 has been found to assist in correct folding of FGF-2 （fibroblast growth factor-2） denatured with 8 mol/L urea and 10 mmol/L dithiothreitol at pH 7.2. The refolding of FGF-2 was...A pH-responsive polymer Eudragit S-100 has been found to assist in correct folding of FGF-2 （fibroblast growth factor-2） denatured with 8 mol/L urea and 10 mmol/L dithiothreitol at pH 7.2. The refolding of FGF-2 was performed by directly diluting denatured FGF-2 into a refolding buffer containing Eudragit S-100. The ability of Eudragit S-100 to enhance protein refolding level was investigated using MTT method, fluorescence emission spectroscopy and reverse phase HPLC. On the other hand, the result shows the ability of Eudragit S-100 to enhance the refolding level of protein is due to the interaction between Eudragit S-100 and oositivelv charaed FGF-2.展开更多
Objective: Acute liver injury(ALF) is a potential factor of many serious hepatopathies. Carbon tetrachloride(CCl4) is a possible environmental toxicant that can induce ALF. Portulaca oleracea(PO) is one of the most po...Objective: Acute liver injury(ALF) is a potential factor of many serious hepatopathies. Carbon tetrachloride(CCl4) is a possible environmental toxicant that can induce ALF. Portulaca oleracea(PO) is one of the most popular edible herbs and has several biological activities such as antioxidant, antimicrobial, antiinflammatory effects. We explored the significance of PO in regulating inflammatory function in animal models and cultured hepatocytes during liver damage caused by CCl4.Methods: The effect of PO on ALF was evaluated by CCl4-induced mice models in vivo. Hepatic levels of transaminase activities and inflammatory factors were examined. The gene and protein expression of S100A8 and S100A9 were measured by RT-PCR and Western blot analysis. Meanwhile, the efficacy of PO was certified by HepG2 cells in vitro. The transaminase activities, inflammatory factors, and the protein expression of S100A8 and S100A9 were also detected.Results: Animal tests showed that pretreatment with PO reduced the liver pathological tissue damage and the serum levels of ALT, AST, ALT and LDH, as well as reducing the pro-inflammatory cytokines(IL-1β, IL-6, TNF-a) secretion in CCl4-induced liver injury mice. Simultaneously, Hep G2 cells pretreated with PO exhibited a significant decrease in the activities of ALT and AST. Moreover, PO resulted in a significant downregulation of the pro-inflammatory markers S100A8, S100A9 gene and protein expression on CCl4induced acute liver injury was demonstrated entirely in vivo and vitro experiments.Conclusion: PO may down-regulate S100A8 and S100A9 and inhibit pro-inflammatory cytokines’ release,indicating a potential clinical effect for controlling the disease.展开更多
基金supported by grants from the Hi-tech Research and Development Program of China(No.2007AA02Z110)Key Grant of Wenzhou Department of Science and Technology(No.Y2007A106)+1 种基金Grant of Guangzhou Department of Science and Technology(No.GK0701013)Grant from Health Bureau of Zhejiang (No.B135).
文摘A pH-responsive polymer Eudragit S-100 has been found to assist in correct folding of FGF-2 （fibroblast growth factor-2） denatured with 8 mol/L urea and 10 mmol/L dithiothreitol at pH 7.2. The refolding of FGF-2 was performed by directly diluting denatured FGF-2 into a refolding buffer containing Eudragit S-100. The ability of Eudragit S-100 to enhance protein refolding level was investigated using MTT method, fluorescence emission spectroscopy and reverse phase HPLC. On the other hand, the result shows the ability of Eudragit S-100 to enhance the refolding level of protein is due to the interaction between Eudragit S-100 and oositivelv charaed FGF-2.
基金supported by Independent Research Projects for young teachers of Minzu University of China [No. 2021NQPY90]。
文摘Objective: Acute liver injury(ALF) is a potential factor of many serious hepatopathies. Carbon tetrachloride(CCl4) is a possible environmental toxicant that can induce ALF. Portulaca oleracea(PO) is one of the most popular edible herbs and has several biological activities such as antioxidant, antimicrobial, antiinflammatory effects. We explored the significance of PO in regulating inflammatory function in animal models and cultured hepatocytes during liver damage caused by CCl4.Methods: The effect of PO on ALF was evaluated by CCl4-induced mice models in vivo. Hepatic levels of transaminase activities and inflammatory factors were examined. The gene and protein expression of S100A8 and S100A9 were measured by RT-PCR and Western blot analysis. Meanwhile, the efficacy of PO was certified by HepG2 cells in vitro. The transaminase activities, inflammatory factors, and the protein expression of S100A8 and S100A9 were also detected.Results: Animal tests showed that pretreatment with PO reduced the liver pathological tissue damage and the serum levels of ALT, AST, ALT and LDH, as well as reducing the pro-inflammatory cytokines(IL-1β, IL-6, TNF-a) secretion in CCl4-induced liver injury mice. Simultaneously, Hep G2 cells pretreated with PO exhibited a significant decrease in the activities of ALT and AST. Moreover, PO resulted in a significant downregulation of the pro-inflammatory markers S100A8, S100A9 gene and protein expression on CCl4induced acute liver injury was demonstrated entirely in vivo and vitro experiments.Conclusion: PO may down-regulate S100A8 and S100A9 and inhibit pro-inflammatory cytokines’ release,indicating a potential clinical effect for controlling the disease.
文摘目的观察体外循环(cardiopulmonary bypass,CPB)和非CPB下行手术的主动脉缩窄患儿中血清泛素羧基末端水解酶L1(ubiquitin carboxyl-terminal esterase-L1,UCH-L1)浓度变化,评价UCH-L1是否是一个主动脉弓部手术后CPB相关脑损伤的预测指标。方法 2012年1月和2013年6月首都医科大学附属北京儿童医院共39例主动脉缩窄患儿接受了主动脉成型手术;其中A组17例未行CPB,B组22例应用选择性脑灌注分别在6个时间点(麻醉诱导后,关胸,术后2、8、24、48 h)收集血清标本,采用酶联免疫吸附法分别测定UCH-L1、神经胶质蛋白S-100β和神经元特异性烯醇化酶(neuron specific enolase,NSE)浓度。在术后8 h,拔除气管插管后6 h和出院前进行神经系统功能评分。结果 2组血清中UCH-L1浓度在术前基本相同[A组(0.184±0.066)μg/L vs B组(0.194±0.067)μg/L]。B组术后2 h后血清UCH-L1浓度较A组明显升高[A组(0.238±0.067)μg/L vs B组(0.327±0.151)μg/L,P<0.05],并于术后8 h达到高峰。在术后24 h,2组血清UCH-L1浓度差异无统计学意义[A组(0.208±0.078)μg/L vs B组(0.201±0.081)μg/L,P>0.05]。B组血清UCH-L1的峰值浓度和CPB时间明显相关(r=0.575,P=0.005)。术后所有患者均未出现持续存在的严重神经系统合并症。结论与非CPB手术相比,应用选择性脑灌注的小儿主动脉弓部手术可引起血清UCH-L1浓度显著升高,并且与CPB时间密切相关。UCH-L1可以作为一个CPB相关脑损伤诊断的潜在生物标志物。
