The two kinds of rigid polyurethane （PU） foams were prepared with respectively adding the refined alkali lignin and alkali lignin modified by 3-chloro-1,2-epoxypropane to be instead of 15% of the polyether glycol in...The two kinds of rigid polyurethane （PU） foams were prepared with respectively adding the refined alkali lignin and alkali lignin modified by 3-chloro-1,2-epoxypropane to be instead of 15% of the polyether glycol in weight. The indexes of mechanical performance, apparent density, thermal stability and aging resistance were separately tested for the prepared PU foams. The results show that the mechanical property, thermal insulation and thermal stability for PU foam with modified alkali lignin are excellent among two kinds of PU foams and control samples. The additions of the refined alkali lignin and modified alkali lignin to PU foam have little effect on the natural aging or heat aging resistance except for decreasing hot alkali resistance apparently. Additionally, the thermal conductivity of modified alkali lignin PU foam is lowest among two kinds of PU foams and control samples. The alkali lignin PU foam modified by 3-chloro-1,2-epoxypropane could be applied in the heat preservation field.展开更多
目的:通过药效试验筛选马钱子抗炎镇痛的主要药效成分,优选马钱子碱囊泡凝胶的体外透皮促渗剂。方法:考察不同马钱子提取物对佐剂性关节炎大鼠关节肿胀度和屈关节疼痛的影响,确定抗炎镇痛的关键成分。采用p H梯度法制备马钱子碱囊泡凝胶...目的:通过药效试验筛选马钱子抗炎镇痛的主要药效成分,优选马钱子碱囊泡凝胶的体外透皮促渗剂。方法:考察不同马钱子提取物对佐剂性关节炎大鼠关节肿胀度和屈关节疼痛的影响,确定抗炎镇痛的关键成分。采用p H梯度法制备马钱子碱囊泡凝胶,利用Franz扩散池进行体外透皮试验,扩散池透皮面积2.8 cm2,接受池体积6.5 m L,磁力搅拌速度500 r·min-1,水浴温度(37±1)℃,接受液为p H 7.4磷酸盐缓冲液,考察不同种类和不同用量促渗剂对该制剂体外渗透性能的影响。结果:马钱子碱是马钱子抗炎镇痛的主要药效成分。不同促渗剂均能促进马钱子碱囊泡凝胶的体外渗透性能,不同促渗剂对马钱子碱体外渗透的作用强弱顺序为氮酮>聚山梨酯-20>油酸聚乙二醇甘油酯>月桂酸聚乙二醇甘油酯>肉豆蔻酸异丙脂>聚甘油脂肪酸酯>乙醇>1-甲基-2-吡咯烷酮>水,不同用量氮酮对马钱子碱的促渗作用强弱为10%>7.5%>5%>3%>4%>2%>1%>0.5%。结论:马钱子碱具有抗炎镇痛作用,加入3%氮酮的马钱子囊泡凝胶体外透皮效果较好。展开更多
AIM: To investigate the effect of Tetrandrine (Tet) on LPS-induced NF-κB activation and cell injury in pancreatic acinar cells and to explore the mechanism of Tetrandrine preventing LPS-induced acinar cell injury. ME...AIM: To investigate the effect of Tetrandrine (Tet) on LPS-induced NF-κB activation and cell injury in pancreatic acinar cells and to explore the mechanism of Tetrandrine preventing LPS-induced acinar cell injury. METHODS: Male rat pancreatic acinar cells were isolated by collagenase digestion, then exposed to LPS (10 mg/L), Tet (50μmol/L, 100μmol/L) or normal media. At different time point (30 min, 1 h, 4 h, 10 h) after treatment with the agents, cell viability was determined by MTT, the product and nuclear translocation of subunit p65 of NF-κB was visualized by immunofluorescence staining and nuclear protein was extracted to perform EMSA which was used to assay the NF-κB binding activity. RESULTS: LPS induced cell damage directly in a time dependent manner and Tet attenuated LPS-induced cell damage (50μmol/L, P < 0.05; 100μmol/L, P < 0.01). NF-κB p65 immunofluorescence staining in cytoplasm increased and began showing its nuclear translocation within 30 min and the peak was shown at 1 h of LPS 10 mg/L treatment. NF-κB DNA binding activity showed the same alteration pattern as p65 immunofluorescence staining. In Tet group, the immunofluorescence staining in cytoplasm and nuclear translocation of NF-κB were inhibited significantly. CONCLUSION: NF-κB activation is an important early event that may contribute to inflammatory responses and cell injury in pancreatic acinar cells. Tet possesses the protective effect on LPS-induced acinar cell injury by inhibiting NF-κB activation.展开更多
AIM： To determine the effects of pentoxifylline （PTX） on clinical manifestations and evaluate arterial blood gas data in hepatopulmonary syndrome （HPS） in chil- dren. METHODS： In a pilot study of 10 children wit...AIM： To determine the effects of pentoxifylline （PTX） on clinical manifestations and evaluate arterial blood gas data in hepatopulmonary syndrome （HPS） in chil- dren. METHODS： In a pilot study of 10 children with chronic liver disease, who had HPS, 20 mg/kg/d PTX was ad- ministered for 3 mo. Clinical data and arterial blood gas parameters were evaluated at baseline, the end of the treatment period, and 3 mo after drug discontinuation. RESULTS： Six patients could tolerate PTX, while four patients experienced complications, Among patients who could tolerate PTX, there was a significant increase in arterial oxygen pressure （PaO2） （P = 0,02） and oxy- gen saturation （Sa02） （P = 0.04） and alveolar-arterial oxygen gradient （P = 0.02） after 3 mo of treatment. Significant decreases in Pa02 （P = 0.02） and alveolararterial oxygen gradient （P = 0.02） were also seen after drug discontinuation. CONCLUSION： PTX may improve PaO2, Sa02 and alve- olar-arterial oxygen gradient in the early stage of HPS.展开更多
Berberine is identified to lower the serum cholesterol level in human and hamster through the induction of low density lipoproteins （LDL） receptor in hepatic cells. To evaluate its potential in preventing atheroscle...Berberine is identified to lower the serum cholesterol level in human and hamster through the induction of low density lipoproteins （LDL） receptor in hepatic cells. To evaluate its potential in preventing atherosclerosis, the effect of berberine on atherosclerosis development in apolipoprotcin E-deficient （apoE^-/-） mice was investigated. In apoE^-/- mice, berberine induced in rivo foam cell formation and promoted atheroselerosis development. The foam cell formation induced by berberinc was also observed in mouse RAW264.7 cells, as well as in mouse and human primary macrophages. By inducing scavenger receptor A （SR-A） expression in macrophages, berberine increased the uptake of modified LDL （DiO-Ac-LDL）. Bcrberine-induced SR-A expression was also observed in macrophage foam cells in vivo and in the cells at atherosclerotic lesion. Analysis in RAW264.7 cells indicated that berberine induced SR-A expression by suppressing PTEN expression, which led to sustained Akt activation. Our results suggest that to evaluate the potential of a cholesterol-reducing compound in alleviating atherosclerosis, its effect on the ceils involved in atherosclerosis development, such as macrophages, should also be considered. Promotion of foam cell formation could counter-balance the beneficial effect of lowering serum cholesterol.展开更多
Brucine has anti-inflammatory and analgesic effects and is the main active compound of the seeds of Strychnos nux-vomica L. To study brucine niosomal gels, a reliable and rapid LC-MS/MS method was established to quant...Brucine has anti-inflammatory and analgesic effects and is the main active compound of the seeds of Strychnos nux-vomica L. To study brucine niosomal gels, a reliable and rapid LC-MS/MS method was established to quantify brucine levels in rats. Tissue distribution and pharmacokinetics of brucine were investigated after topical and oral application of brucine niosomal gels to rats. The plasma concentration versus time profiles suggested that systemic exposure of brucine for oral administration of brucine niosomal gels was higher than that for topical administration, and topical administration showed a relatively sustained release. There was a considerable amount of brucine distributed in the knee joint. These results provided a strong basis for the follow-up study of this preparation.展开更多
文摘The two kinds of rigid polyurethane （PU） foams were prepared with respectively adding the refined alkali lignin and alkali lignin modified by 3-chloro-1,2-epoxypropane to be instead of 15% of the polyether glycol in weight. The indexes of mechanical performance, apparent density, thermal stability and aging resistance were separately tested for the prepared PU foams. The results show that the mechanical property, thermal insulation and thermal stability for PU foam with modified alkali lignin are excellent among two kinds of PU foams and control samples. The additions of the refined alkali lignin and modified alkali lignin to PU foam have little effect on the natural aging or heat aging resistance except for decreasing hot alkali resistance apparently. Additionally, the thermal conductivity of modified alkali lignin PU foam is lowest among two kinds of PU foams and control samples. The alkali lignin PU foam modified by 3-chloro-1,2-epoxypropane could be applied in the heat preservation field.
文摘目的:通过药效试验筛选马钱子抗炎镇痛的主要药效成分,优选马钱子碱囊泡凝胶的体外透皮促渗剂。方法:考察不同马钱子提取物对佐剂性关节炎大鼠关节肿胀度和屈关节疼痛的影响,确定抗炎镇痛的关键成分。采用p H梯度法制备马钱子碱囊泡凝胶,利用Franz扩散池进行体外透皮试验,扩散池透皮面积2.8 cm2,接受池体积6.5 m L,磁力搅拌速度500 r·min-1,水浴温度(37±1)℃,接受液为p H 7.4磷酸盐缓冲液,考察不同种类和不同用量促渗剂对该制剂体外渗透性能的影响。结果:马钱子碱是马钱子抗炎镇痛的主要药效成分。不同促渗剂均能促进马钱子碱囊泡凝胶的体外渗透性能,不同促渗剂对马钱子碱体外渗透的作用强弱顺序为氮酮>聚山梨酯-20>油酸聚乙二醇甘油酯>月桂酸聚乙二醇甘油酯>肉豆蔻酸异丙脂>聚甘油脂肪酸酯>乙醇>1-甲基-2-吡咯烷酮>水,不同用量氮酮对马钱子碱的促渗作用强弱为10%>7.5%>5%>3%>4%>2%>1%>0.5%。结论:马钱子碱具有抗炎镇痛作用,加入3%氮酮的马钱子囊泡凝胶体外透皮效果较好。
基金Supported by the National Natural Science Foundation of China, No. 30370643
文摘AIM: To investigate the effect of Tetrandrine (Tet) on LPS-induced NF-κB activation and cell injury in pancreatic acinar cells and to explore the mechanism of Tetrandrine preventing LPS-induced acinar cell injury. METHODS: Male rat pancreatic acinar cells were isolated by collagenase digestion, then exposed to LPS (10 mg/L), Tet (50μmol/L, 100μmol/L) or normal media. At different time point (30 min, 1 h, 4 h, 10 h) after treatment with the agents, cell viability was determined by MTT, the product and nuclear translocation of subunit p65 of NF-κB was visualized by immunofluorescence staining and nuclear protein was extracted to perform EMSA which was used to assay the NF-κB binding activity. RESULTS: LPS induced cell damage directly in a time dependent manner and Tet attenuated LPS-induced cell damage (50μmol/L, P < 0.05; 100μmol/L, P < 0.01). NF-κB p65 immunofluorescence staining in cytoplasm increased and began showing its nuclear translocation within 30 min and the peak was shown at 1 h of LPS 10 mg/L treatment. NF-κB DNA binding activity showed the same alteration pattern as p65 immunofluorescence staining. In Tet group, the immunofluorescence staining in cytoplasm and nuclear translocation of NF-κB were inhibited significantly. CONCLUSION: NF-κB activation is an important early event that may contribute to inflammatory responses and cell injury in pancreatic acinar cells. Tet possesses the protective effect on LPS-induced acinar cell injury by inhibiting NF-κB activation.
基金Supported by Research Council of Mashhad University of Medical Sciences
文摘AIM： To determine the effects of pentoxifylline （PTX） on clinical manifestations and evaluate arterial blood gas data in hepatopulmonary syndrome （HPS） in chil- dren. METHODS： In a pilot study of 10 children with chronic liver disease, who had HPS, 20 mg/kg/d PTX was ad- ministered for 3 mo. Clinical data and arterial blood gas parameters were evaluated at baseline, the end of the treatment period, and 3 mo after drug discontinuation. RESULTS： Six patients could tolerate PTX, while four patients experienced complications, Among patients who could tolerate PTX, there was a significant increase in arterial oxygen pressure （PaO2） （P = 0,02） and oxy- gen saturation （Sa02） （P = 0.04） and alveolar-arterial oxygen gradient （P = 0.02） after 3 mo of treatment. Significant decreases in Pa02 （P = 0.02） and alveolararterial oxygen gradient （P = 0.02） were also seen after drug discontinuation. CONCLUSION： PTX may improve PaO2, Sa02 and alve- olar-arterial oxygen gradient in the early stage of HPS.
文摘Berberine is identified to lower the serum cholesterol level in human and hamster through the induction of low density lipoproteins （LDL） receptor in hepatic cells. To evaluate its potential in preventing atherosclerosis, the effect of berberine on atherosclerosis development in apolipoprotcin E-deficient （apoE^-/-） mice was investigated. In apoE^-/- mice, berberine induced in rivo foam cell formation and promoted atheroselerosis development. The foam cell formation induced by berberinc was also observed in mouse RAW264.7 cells, as well as in mouse and human primary macrophages. By inducing scavenger receptor A （SR-A） expression in macrophages, berberine increased the uptake of modified LDL （DiO-Ac-LDL）. Bcrberine-induced SR-A expression was also observed in macrophage foam cells in vivo and in the cells at atherosclerotic lesion. Analysis in RAW264.7 cells indicated that berberine induced SR-A expression by suppressing PTEN expression, which led to sustained Akt activation. Our results suggest that to evaluate the potential of a cholesterol-reducing compound in alleviating atherosclerosis, its effect on the ceils involved in atherosclerosis development, such as macrophages, should also be considered. Promotion of foam cell formation could counter-balance the beneficial effect of lowering serum cholesterol.
基金National Science and Technology Major Projects for"Major New Drugs Innovation and Development"(Grant No.2017ZX09301016)
文摘Brucine has anti-inflammatory and analgesic effects and is the main active compound of the seeds of Strychnos nux-vomica L. To study brucine niosomal gels, a reliable and rapid LC-MS/MS method was established to quantify brucine levels in rats. Tissue distribution and pharmacokinetics of brucine were investigated after topical and oral application of brucine niosomal gels to rats. The plasma concentration versus time profiles suggested that systemic exposure of brucine for oral administration of brucine niosomal gels was higher than that for topical administration, and topical administration showed a relatively sustained release. There was a considerable amount of brucine distributed in the knee joint. These results provided a strong basis for the follow-up study of this preparation.
