青龙衣黄酮类化学成分研究

目的研究青龙衣(核桃楸Juglans mandshurica未成熟果实的外果皮)的化学成分。方法采用反复硅胶柱色谱、SephadexLH-20柱色谱和ODS柱色谱法等进行分离纯化,并运用NMR波谱技术鉴定化合物的结构。结果从青龙衣95%乙醇提取物中分离得到14个化合物,分别鉴定为芹菜素(1)、苜蓿素(2)、异泽兰黄素(3)、3,7,8,3′-四羟基-4′-甲氧基黄酮(4)、3,5-二羟基-7-甲氧基-3′,4′-亚甲二氧基黄酮(5)、花旗松素(6)、槲皮素-3-O-(6″-没食子酰基)-β-D-半乳糖苷(7)、槲皮素-3-O-(4″-O-乙酰基)-α-L-鼠李糖苷(8)、黄杞苷(9)、异黄杞苷(10)、山柰酚-3-O-β-D-吡喃葡萄糖苷(11)、槲皮素-3-O-β-D-葡萄糖醛酸苷(12)、槲皮素-3-O-β-D-吡喃葡萄糖苷(13)、杨梅素-3-O-β-D-葡萄糖醛酸苷(14)。结论化合物1～10、12、14为首次从青龙衣中分离得到。     

聚酰胺柱色谱法分离黄酮醇与二氢黄酮醇类化合物

目的 采用聚酰胺柱色谱分离黄酮醇与二氢黄酮醇类化合物.方法 采用聚酰胺柱色谱作为分离手段,结合紫外、红外吸收光谱进行检测.结果 运用聚酰胺柱色谱法一次分离得高纯度黄酮醇与二氢黄酮醇.结论 本实验为分离2,3位饱和度不同黄酮醇类化合物提供了较稳定的、简便的分离方法 .     

中药水红花子HPLC指纹图谱的研究

目的:为保证水红花子药材质量稳定可控,研究水红花子药材指纹图谱的测定方法。方法:采用HPLC法测定甲醇提取液的指纹图谱,对28件商品药材进行了比较,并进行了方法学考察。结果:建立了水红花子药材HPLC指纹图谱,发现7个色谱峰为共有峰,确定了其相对保留时间和峰面积比值的范围。结论:在选定的条件下所建立的指纹图谱可以控制水红花子药材商品质量。     

Taxifolin attenuates inflammation via suppressing MAPK signal pathway in vitro and in silico analysis

Objective Taxifolin is a natural flavonoid compound that can be isolated from onions, grapes, oranges and grapefruit. It also acts as a medicine food homology with extraordinary antioxidant and anti-inflammatory activity. This study aims to explain the protective effects and potential mechanisms of taxifolin against inflammatory reaction. Methods Levels of interleukin (IL)-6, IL-1β and intracellular reactive oxygen species (ROS)were assessed in different time after the treatment of taxifolin in RAW264.7 cells induced by lipopolysaccharide (LPS). Subsequently, the mRNA and protein levels of inducible nitric oxide synthase (iNOS), vascular endothelial growth factor (VEGF), cyclooxygenase (COX)-2, tumor necrosis factor (TNF)-α and the phosphorylation expression levels of the MAPK signal pathway were also evaluated. A silico analysis was used to explain the binding situation for the investigation of taxifolin and MAPK signal pathway. And then MAPK inhibitors were used to reveal the expression level of iNOS, VEGF, COX-2 and TNF-α in RAW264.7 cells. Results It was demonstrated that cell inflammatory damage induced by LPS was significantly alleviated after the treatment of taxifolin. Then, the mRNA and protein levels of iNOS, VEGF, COX-2 and TNF-α were reduced and the phosphorylation expression levels of the MAPK signal pathway were down-regulated remarkably as well. In silico analysis, taxifolin could form a relatively stable combination with MAPK signal pathway. MAPK inhibitors showed increasing or decreasing effect in the mRNA levels of iNOS, VEGF, COX-2 and TNF-α, which suggesting that taxifolin down-regulated iNOS, VEGF, COX-2 and TNF-α expressions were not entirely through the MAPK pathway. Conclusion This finding demonstrated that taxifolin improved the inflammatory responses that partly involved in the phosphorylation expression level of MAPK signal pathway in RAW264.7 cells exposed to acute stress.     

Acceleration of fibril formation and thermal stabilization of collagen fibrils in the presence of taxifolin (dihydroquercetin)

We studied the effect of flavonoid taxifolin (dihydriquercetin) on the structure and thermal stability of collagen I fibrils. Taxifolin accelerated fibril formation with reconstruction of periodical cross-striation characteristic of these fibrils. Differential scanning calorimetry showed elevation of melting temperature of collagen fibrils formed in neutral or weakly alkaline media, but not of individual tropocollagen molecules in acid medium. Taxifolin capacity to stimulate fibril formation and promote stabilization of fibrillar forms of collagen can be used in medicine. __________ Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 144, No. 12, pp. 640–643, December, 2007     

花旗松素对人宫颈癌Hela细胞的体外抗肿瘤活性及其机理研究

目的观察和探索花旗松素对人宫颈癌Hela细胞的体外抗肿瘤活性及其作用机理。方法结晶紫染色法检测花旗松素对人宫颈癌Hela细胞的增殖抑制作用;RT-PCR法检测与肿瘤细胞凋亡相关基因的表达。结果花旗松素能够抑制人宫颈癌Hela细胞的增殖,呈剂量依赖关系;花旗松素不能诱导Bcl-2 mRNA和Bax mRNA的表达,但能使P53和P21的mRNA表达量增加。结论花旗松素具有良好的体外抑制人宫颈癌Hela细胞增殖作用;花旗松素诱导Hela细胞死亡与细胞凋亡相关,其分子机制可能与升高P53和P21mRNA表达有关,而与Bcl-2和Bax的蛋白转录无关。     

二氢槲皮素固体分散体片的制备及体外溶出度的研究

目的 应用固体分散技术,提高二氢槲皮素及其片剂的体外溶出度.方法 以PEG-4000、PEG-6000和PVP-K30为载体,采用溶剂-熔融法制备了二氢槲皮素固体分散体,考察不同载体对固体分散体溶出度的影响.同时制得二氢槲皮素固体分散体片,并着重考察了片剂的体外溶出度.结果 以亲水性PVP-K30为载体制备的固体分散体能够显著的提高二氢槲皮素的体外溶出度,制成固体分散片剂后,二氢槲皮素固体分散体片的溶出度可达86.8％.结论 以PVPK30为载体的固体分散体片可提高二氢槲皮素的溶解度,制备二氢槲皮素固体分散片达到设计要求,且制法简便可行.     

花旗松素通过PI3K/AKT/mTOR通路对宫颈癌SiHa细胞自噬、凋亡和衰老的影响

[目的] 观察花旗松素（Taxifolin）对宫颈癌SiHa细胞自噬,凋亡和衰老的影响。[方法] 采用0、5、10、20μmol/LTaxifolin处理宫颈癌SiHa细胞。CCK-8法检测细胞细胞增殖倍数;蛋白免疫印迹检测Beclin1、p62、LC3II/LC3I蛋白表达水平;免疫荧光检测LC3+含量;流式细胞仪检测细胞凋亡;流式分选检测线粒体膜电位;蛋白免疫印迹检测Bcl-2、Bax、Caspase-3、cleavedCaspase-3、Caspase-9、cleavedCaspase-9、磷脂酰肌醇-3-激酶（PI3K）、pPI3K、蛋白激酶B（AKT）、p-AKT、哺乳动物雷帕霉素靶蛋白（mTOR）、p-mTOR蛋白表达水平,加入AKT激活剂SC79进行验证。[结果] 与Taxifolin0μmol/L组相比较,Taxifolin10、20μmol/L组细胞增殖倍数显著降低（P<0.05）,p62蛋白水平显著降低（P<0.05）,Beclin1、LC3II/LC3I蛋白水平显著升高（P<0.05）,LC3+含量显著升高（P<0.05）,凋亡率显著升高（P<0.05）,线粒体膜电位显著升高（P<0.05）,Bcl-2/Bax比值显著降低（P<0.05）,cleavedCaspase-3/Caspase-3、cleavedCaspase-9/Caspase-9比值升高（P<0.05）,p-PI3K/PI3K、p-AKT/AKT、p-mTOR/mTOR比值显著降低（P<0.05）。加入PI3K/AKT信号通路激活剂SC79可逆转花旗松素对SiHa细胞凋亡、自噬及PI3K/AKT信号通路相关蛋白表达的影响。[结论] Taxifolin通过抑制PI3K/AKT/mTOR通路的活化诱导宫颈癌SiHa细胞自噬,凋亡和衰老。     

花旗松素对人肺癌细胞A549增殖的抑制作用及其机制研究

目的研究花旗松素对人肺癌细胞A549增殖的抑制作用,并探讨其诱导细胞凋亡的可能机制。方法 WST-1法检测不同质量浓度(0~200μg/m L)花旗松素对A549细胞增殖的影响;Annexin-V/PI双染法检测花旗松素对A549细胞凋亡的影响;细胞免疫荧光法观察花旗松素处理后A549细胞中凋亡蛋白Bax的表达;Western blotting法检测Bcl-2、Akt、P53蛋白表达的变化。结果 WST-1法检测到花旗松素能有效抑制A549细胞的增殖,呈现时间–剂量–效应关系。通过流式细胞仪分析,花旗松素诱导细胞凋亡,上调了促凋亡蛋白Bax的表达,下调抗凋亡蛋白Bcl-2的表达,抑制Akt的过表达,并且促进P53的表达。结论花旗松素对A549细胞的增殖具有显著的抑制作用,其诱导的凋亡机制可能与Bcl-2、Akt相关信号通路的激活有关。