保元汤作为临床上广泛用于冠心病气虚血瘀兼阳虚证治疗的经典名方,其药效物质基础和作用机制迄今尚缺乏系统研究。为了阐明保元汤的活性物质基础及其作用机制,该文采用氧糖剥夺/复氧(OGD/R)诱导的H9c2心肌细胞损伤模型,对保元汤及其所含单体化合物进行心肌保护活性筛选;之后采用Pub Chem's Bio Assay database对具有活性的单体化合物进行生物靶标预测,并将预测的生物靶标进行归类整理,分析保元汤中活性成分与生物靶标之间的内在联系。结果发现保元汤水提物及其中17个单体化合物能够显著提高OGD/R诱导的H9c2心肌细胞存活率;虚拟靶标筛选研究结果显示,15个活性单体化合物与心肌保护相关的潜在作用机制主要涉及调控氧化应激通路、钙离子通路、线粒体保护、抗细胞凋亡等。该研究结果验证了保元汤具有心肌保护作用,并且阐明其保护作用是通过多成分、多靶点的网络调控作用实现的。该文研究结果为临床上保元汤用于冠心病的治疗提供了理论依据和参考。
Monoterpene glycosides are the major bioactive compounds of Paeonia lactiflora Pall（P. lactiflora）. Characteristic neutral loss of 30 Da has been extensively reported for monoterpene glycosides in tandem mass spectr...
详细信息
Monoterpene glycosides are the major bioactive compounds of Paeonia lactiflora Pall（P. lactiflora）. Characteristic neutral loss of 30 Da has been extensively reported for monoterpene glycosides in tandem mass spectrometry. However, little is known about mechanism of this fragmentation. The neutral loss of 30 Da was studied for eleven monoterpene glycosides（1–11） from P. lactiflora by ion trap mass spectrometry in this report. Compounds 1–5 with a hemiacetal structure could readily lose 30 Da at low collision energy of 30% in MS/MS by ion trap mass spectrometry. For compounds 6–11, neutral loss of 30 Da could also be observed at low abundance, but the collision energy had to be increased to 60%. In both cases, high-accuracy mass spectrometry assigned the 30 Da as CH_2O. After careful analysis of the structures and mass spectra, we believe that the neutral loss of 30 Da in compounds 1–5 was due to cleavage of the hemiacetal structure, whereas it was ascribed to the cleavage of 5＇-hydroxymethyl group of the glucosyl residue in other monoterpene glycosides. Furthermore, the characteristic neutral loss of 30 Da at low collision energy was used to screen hemiacetals from crude extracts of P. lactiflora and related plant species. Significant differences among Paeonia species were observed by 30 Da neutral loss analysis.
Tumor-associated carbohydrate antigens （TACAs）, important molecular markers on tumor cells, are major targets for the development of anti-cancer vaccines. However, due to the immunotolerance and weak immunogenicity,...
详细信息
Tumor-associated carbohydrate antigens （TACAs）, important molecular markers on tumor cells, are major targets for the development of anti-cancer vaccines. However, due to the immunotolerance and weak immunogenicity, native TACAs cannot induce powerful immune response. The use of modified TACAs such as N-glycosides could be an alternative strategy to overcome this problem. Herein, the synthesis of N（OMe）-linked analogue of tumor-associated disaccharide antigen Thomsen-Friedenreich （TF） by the glycosylation reaction is described.
暂无评论