UPLC-Q-TOF-MS快速鉴定止动颗粒血浆及尿液中移行成分

目的采用UPLC-Q-TOF-MS对止动颗粒血浆及尿液中移行成分进行快速定性,为体内药效物质基础研究提供参考。方法 Waters UPLC HSS T3(150 mm×2.1 mm,1.8μm)色谱柱,0.1%甲酸水(A)-乙腈(B)梯度洗脱,体积流量0.3 mL/min,柱温35℃,采用电喷雾电离化源(ESI),MSE扫描模式进行正、负离子检测。结果通过与空白生物样品和对照品的提取离子色谱图、质谱碎片裂解信息比对,初步鉴定出45个血浆及尿液中移行成分,包括28个原型成分和17个代谢产物。结论建立的UPLC-Q-TOF-MS分析方法可为止动颗粒在血浆及尿液中移行成分的定性分析提供一种快速、简便、可靠的分析手段,为该制剂的药效物质基础研究奠定基础。     

川芎内生真菌次级代谢产物中1个新的内酯化合物

目的研究川芎内生真菌Alternaria sp. IS275代谢产物的化学成分。方法采用硅胶和葡聚糖凝胶Sephadex LH-20柱色谱、反相中压液相色谱、制备薄层色谱以及半制备高效液相色谱等分离技术,对川芎内生真菌发酵液的醋酸乙酯提取部位进行分离纯化,利用现代波谱学手段对分离的化学成分进行结构鉴定。结果从川芎内生真菌Alternaria sp. IS275代谢产物的醋酸乙酯提取部位分离得到1个新的内酯类化合物,鉴定为(+)-4,11-二羟基-2-十二烯-5-内酯。结论化合物1为首次从川芎内真菌中分离得到的新内酯化合物,命名为芎孢内酯A。     

黄独素B的体外代谢通路及其代谢产物研究

目的基于体外代谢模型对黄独素B的代谢稳定性、主要CYP450代谢酶表型及其代谢产物进行研究。方法黄独素B分别在人肝微粒体(HLM)和大鼠肝微粒体(RLM)中共同孵育,采用UPLC-MS/MS检测孵育液中剩余的黄独素B含量,分析其在HLM和RLM中的代谢稳定性。利用10种重组人CYP450酶(1A1、1A2、1B1、2A13、2A6、2B6、2D6、2C9、2C19、3A4)分别与黄独素B共同孵育,确定其代谢酶表型,结合大鼠离体肝灌流模型对黄独素B的主要代谢酶表型进行确认。此外,分别对HLM和RLM孵育体系中的黄独素B代谢产物进行定性分析,考察黄独素B在HLM和RLM中代谢产物的区别。结果在HLM和RLM中,黄独素B的转化率分别为37%、59%,经HLM和RLM代谢的体外半衰期(t1/2)为97.4、52.3 min,推算得到的HLM和RLM中的固有清除率(CLint, in vivo)为8.23、23.9 mL/(min·kg),肝清除率(CLh)为5.89、16.8 mL/(min·kg),由此可知黄独素B在RLM体系中的代谢转化速率较HLM中快。黄独素B体外代谢酶表型结果可知其I相代谢是由多个CYP同工酶介导的,包括3A4、2C19、2C9、1A13及1A1,其中CYP3A4对黄独素B的代谢起主导作用;肝灌流实验结果显示,随着酮康唑给药剂量的增加,对肝脏中CYP3A4的抑制作用增强,黄独素B在肝脏中的代谢减少,在灌流液中的剩余量增加,印证了CYP3A4对黄独素B的代谢作用。此外,2种肝微粒体孵育后的黄独素B都只产生了1个代谢产物(M1),为黄独素B去甲基化产物。结论黄独素B在RLM中的代谢转化速率较HLM中快。黄独素B的主要代谢酶表型为CYP3A4,其在HLM和RLM中产生的代谢物均为去甲基化产物。     

大鼠ig牡丹皮提取物后丹皮酚及其代谢产物的药动学研究

目的 考察ig给予大鼠牡丹皮提取物后,丹皮酚及4种主要代谢产物M1~M4在大鼠体内的药动学特征。方法 SD雄性大鼠ig给予不同剂量（0.5、1.0、2.0 g/kg）牡丹皮提取物,于各时间点从大鼠眼底静脉丛取血,收集血浆样品;ig给予1.0 g/kg的牡丹皮提取物,按相应时间段收集大鼠尿液、胆汁和粪便样品。生物样品用乙腈（含0.1%甲酸）沉淀蛋白的方法处理,用建立的超高效液相色谱串联质谱（UPLC-MS/MS）分析方法检测生物样品中丹皮酚及其4种代谢产物质量浓度。结果 建立的生物样品分析方法符合分析要求。ig给予大鼠不同剂量（0.5、1.0、2.0 g/kg）牡丹皮提取物后,丹皮酚的t_max分别为（0.15±0.08）、（0.33±0.19）、（0.31±0.13）h;t_1/2为（1.16±0.37）、（1.19±0.45）、（1.24±0.35）h;C_max和AUC_0~t随给药剂量的增加而增大,具有剂量依赖性。M1~M4在给药后1 h内也相继达到峰浓度。ig给予1.0 g/kg的牡丹皮提取物后,丹皮酚的代谢产物主要排泄方式为尿液 > 胆汁 > 粪便。结论 大鼠ig给予牡丹皮提取物后,丹皮酚具有快速吸收、代谢及消除的特点,丹皮酚主要通过尿液途径以代谢产物形式排泄。     

A new method to assess oxidative stress in ART cycles

The role of oxidative stress (OS) in female reproduction is an understudied area for investigation. The aim of the study was to assess reactive oxygen species (ROS) levels both in follicular fluid (FF) and in serum samples of women undergoing IVF and to relate them to clinical outcomes. A total of 56 women were enrolled. From each patient a sample of serum and FF were collected at oocyte retrieval day and analyzed for OS, by measuring a class of reactive oxygen metabolites (ROMs) (dROMs test) and for biological anti-oxidant potential levels (BAP test). The data analyzed in serum and in FF were related to pregnancy outcomes. There was no significant relationship between d-ROMs and BAP levels in serum or FF GROUP A and B and the clinical parameters of prognosis of women: age, number of oocytes retrieved number of oocytes methaphase II, FSH, fertilization rate and cleavage rate, number of embryos transferred and embryo score. There was a positive association between systemic levels of OS measured in serum GROUP A and pregnancy outcomes (p?=?0.007) suggesting that the evaluation of OS in FF needs more investigation about markers in follicular microenvironment in order to predict IVF success.     

Emerging role of thyroid hormone metabolites

Thyroid hormones (THs) are essential for the regulation of development and metabolism in key organs. THs produce biological effects both by directly affecting gene expression through the interaction with nuclear receptors (genomic effects) and by activating protein kinases and/or ion channels (short‐term effects). Such activations can be either direct, in the case of ion channels, or mediated by membrane or cytoplasmic receptors. Short‐term‐activated signalling pathways often play a role in the regulation of genomic effects. Several TH intermediate metabolites, which were previously considered without biological activity, have now been associated with a broad range of actions, mostly attributable to short‐term effects. Here, we give an overview of the physiological roles and mechanisms of action of THs, focusing on the emerging position that TH metabolites are acquiring as important regulators of physiology and metabolism.     

耐药口腔鳞癌Tca8113胞外代谢产物的代谢组学分析

目的 探讨口腔鳞癌Tca8113细胞在产生耐药性后胞外代谢产物的变化,寻找差异代谢物.方法 制备胞外代谢产物样本,运用氢谱核磁共振(1H-NMR)获取口腔鳞癌Tca8113细胞和耐药Tca8113/CBP细胞的胞外代谢物图谱,偏最小二乘判别分析(PLS-DA)得出对区分2组细胞贡献较大的差异性变量,将同时满足VIP＞ 1.0和单维统计P＜0.05的代谢物确定为最终的差异代谢物.结果 基于氢谱核磁共振的代谢组学方法可以区分Tca8113和Tca8113/CBP;最终的差异性代谢物有醋酸盐、牛磺酸、丝氨酸、葡萄糖和亮氨酸,它们涉及到了蛋白质代谢、糖代谢和三羧酸循环.结论 应用代谢组学方法成功找到了耐药Tca8113细胞的差异代谢物.     

深海细菌Psychrobacter submarinus 1A01998的次级代谢产物研究

目的 对来自深海沉积物中的海洋细菌Psychrobacter submarinus1 A01998的次级代谢产物进行研究.方法 采用大孑L吸附树脂、硅胶、ODS和Sephadex LH-20凝胶等柱层析色谱分离方法,对海洋细菌Psychrobacter submarinus1 A01998进行次级代谢产物的分离纯化,根据1H NMR、13C NMR和MS等波谱数据分析并结合相关文献对化学结构进行鉴定.结果 从深海细菌Psychrobacter submarinus 1A01998的发酵粗提物中分离得到4个化合物,分别鉴定为环(L-脯氨酸-L-酪氨酸)(1)、环(D-脯氨酸-L-酪氨酸)(2)、3-吲哚甲醛(3)、2'-O-甲氧基尿嘧啶核苷(4).结论 化合物1～4均为首次从该属中分离得到,其中化合物1、2为环二肽类化合物.     

Effect of synthetic dermorphin analogues on tissue homeostasis in the myocardium of newborn albino rats

DNA synthesis and state of the nucleolar apparatus in myocardial cells of newborn albino rats receiving intraperitoneal injection of sedatin, a synthetic dermorphin analogue, were studied by means of autoradiography and silver impregnation. Labeling intensity significantly increased, while the number of nucleoli in nuclei decreased. Chemiluminescence study showed that the concentration of reactive oxygen metabolites significantly decreased in the myocardium of treated animals after sedatin administration. Non-arginine analogue of sedatin had little effect on tissue homeostasis in the myocardium. __________ Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 144, No. 10, pp. 413–416, October, 2007