胡椒碱对SF-21细胞株的杀伤作用及对其形态影响的研究

目的检测胡椒碱对草地贪夜蛾SF-21细胞的毒性作用和生长抑制作用,以便进一步研究其对昆虫细胞离子通道的影响。方法胡椒碱处理SF-21细胞后,用MTT微量酶反应比色法、改良微波Giemsa染色法检测细胞死亡率及形态学改变,用冲击式测试法检测细胞生长率及受损细胞的恢复。结果胡椒碱处理24h后,对SF-21细胞的半数毒性浓度(IC50)为95.37μg/ml,且毒性作用强度随着药物浓度增加而增强。胡椒碱浓度在10μg/ml以上时可诱发SF-21细胞形态学改变,表现为细胞呈多形性、细胞间有间隙、胞质内充满颗粒,以后随药物浓度的升高,胞质出现空泡、染色质凝成粗大颗粒或无结构大块、大片细胞脱落、崩解、死亡。低浓度胡椒碱(5μg/ml)对SF-21细胞增殖没有影响,较高浓度胡椒碱(10、20、40μg/ml)则对SF-21细胞增殖有明显的抑制作用,抑制作用强度随药物浓度的增加而增加,去除药物作用后,受抑制的细胞又重新恢复生长、分裂。结论胡椒碱对昆虫细胞有较强的毒性作用和生长抑制作用,可作为新型杀虫剂的功能物质。     

Synthetic piperine amide analogs with antimycobacterial activity

Piperine amide analogs are synthesized by replacement of the piperidine moiety with different types of cyclic amines, including adamantyl and monoterpene‐derived fragments. The compounds are screened for activity against Mycobacterium tuberculosis H37Rv. The most potent compounds are the 1‐adamantyl and the monoterpene‐derived hybrids, which combine nanomolar antimycobacterial activity with low cytotoxicity against human cells. The presence of quaternary carbon atom as main structural requirement for anti‐TB activity is pointed out by a QSAR study. The most promising compound is the (+)‐isopinocampheylamine‐derived amide which is characterized with selectivity index of 1387.8.     

藏药石榴莲花散中鞣花酸和胡椒碱含量测定方法研究

目的： 建立藏药石榴莲花散中鞣花酸和胡椒碱含量测定方法,以完善其质量标准。方法： 采用高效液相色谱法测定制剂中石榴子和诃子的鞣花酸含量,采用ODS-2 HYPERSIL C₁₈色谱柱（4.6 mm×250mm,5 μm）,以乙腈-0.2%磷酸（15：85）为流动相,流速1.0 mL·min^-1,检测波长254 nm,柱温30℃;采用高效液相色谱法测定制剂中荜茇的胡椒碱含量,采用ODS-2 HYPERSIL C₁₈色谱柱（4.6mm×250 mm,5μm）,以乙腈-水（40：60）为流动相,流速1.0 mL·min^-1,检测波长343 nm,柱温30℃。结果： 鞣花酸进样量在5.065~25.325 μg范围内呈良好线性关系（r=0.9999）,平均回收率为97.5%,RSD=1.5%（n=6）;胡椒碱进样量在10.414~52.071 μg范围内呈良好线性关系（r=1.0000）,平均回收率为99.6%,RSD=0.6%（n=6）。结论： 该方法可准确测定石榴莲花散中鞣花酸和胡椒碱的含量,有助于提高石榴莲花散的质量标准。     

高效液相色谱法同时测定蒙药阿那日-4散中3种成分的含量

目的：建立蒙药阿那日-4散（石榴、肉桂皮、白豆蔻、荜茇）中有效成分没食子酸、桂皮醛和胡椒碱的含量测定方法。方法：采用反相高效液相色谱法以Promosil C₁₈（4.6 mm×250 nm,5μm）为色谱柱;以乙腈-1%冰乙酸水溶液为流动相,梯度洗脱;流速为1.0 mL·min^-1;柱温为30℃;检测波长为290 nm。结果：没食子酸在0.08~0.4μg·mL^-1（r=0.9998）、桂皮醛在0.56~2.81μg·mL^-1（r=0.9996）、胡椒碱在0.52~2.59μg·mL^-1（r=0.9997）范围内与峰面积呈良好的线性关系;其平均回收率（n=6）分别为99.5%（RSD=2.3%）、99.3%（RSD=2.8%）和98.5%（RSD=2.2%）;6批样品中上述3种成分平均含量范围分别为0.198~0.241,2.44~2.61,1.41~1.54μg·g^-1。结论：所建立方法操作简便、稳定可靠、专属性强、准确度及重复性较好,为蒙药阿那日-4散质量检测提供依据。     

Derivatives Form Better Lipoxygenase Inhibitors than Piperine: In Vitro and In Silico Study

Piperine is a secondary metabolite of black pepper. Its uses in medicine were already studied. However, its derivatives have not gained considerable attention. In the presented study, the Lipoxygenase (LOX) inhibitory activity of piperine and its derivatives, piperonylic acid, piperic acid, and piperonal have been assessed and compared by enzyme kinetics, ITC and molecular modeling experiments. The presented investigations expressed that all the studied compounds inhibited LOX by binding at its active site. The IC₅₀ values of these compounds were deduced from the kinetics data and found to be 85.79, 43.065, 45.17, and 50.78 μm for piperine, piperonylic acid, piperic acid, and piperonal, respectively. The binding free energies obtained from ITC experiments were −7.47, −8.33, −8.09, and −7.86 kcal/mol for piperine, piperonylic acid, piperic acid, and piperonal, respectively. Similarly, the glide scores obtained for piperine, piperonylic acid, piperic acid, and piperonal were −7.28, −10.32, −10.72, and −9.57 kcal/mol, respectively. The results of ITC and molecular modeling experiments suggested that piperonylic acid and piperonal exhibit stronger binding at the active site than piperine does. From the presented studies, it could be concluded that derivatives of piperine may be of higher significance than piperine for certain medicinal applications, implicating (Ayurvedic) fermented herbal drugs with piperine in them.     

胡椒碱对人肝癌HepG2细胞抗肿瘤活性的体外实验研究

目的 探讨胡椒碱(piperine)对人HpeG2肝癌细胞株的增殖、杀伤和细胞凋亡的影响,为肝癌的治疗提供理论依据.方法 体外培养的HpeG2细胞,采用MTT比色法检测不同浓度胡椒碱对体外培养的HepG2细胞和新分离的外周血白细胞的增殖抑制作用.Hoechst 33258染色观察细胞凋亡形态,采用流式细胞术测定胡椒碱对HepG2细胞的凋亡.结果 胡椒碱对HepG2细胞增殖的抑制率随着浓度的升高而增加,半量抑制浓度(IC50)为15.13±3.21 μmol/L,低于其对外周血白细胞的抑制率(64.52±5.32 μmol/L).Hoechst 33258染色后,胡椒碱处理癌细胞组表现出典型的细胞凋亡特征,流式细胞仪检测20 μmol/L的胡椒碱处理HepG2细胞24 h后,细胞凋亡率由对照组的2.89%上升到了21.76%.结论 胡椒碱具有抑制HepG2细胞增殖和诱导凋亡的抗肿瘤活性,有应用于肝癌治疗的潜在价值.     

透皮促渗剂对双乌跌打损伤药方体外透皮吸收和体内药效的影响

 目的考察透皮促渗剂对双乌跌打损伤药方体外透皮吸收和体内药理效应的影响。方法采用Franz扩散池,以小鼠离体皮肤为渗透屏障,比较不同透皮促渗剂对双乌跌打损伤复方中指标成分胡椒碱透皮吸收的影响,并在此基础上筛选最佳透皮促渗剂的比例和浓度。采用小鼠热板法和二甲苯致小鼠耳肿胀实验,平行比较了含与不含透皮促渗剂药方的消炎镇痛作用。结果月月月月酮和NMP合用促透效果最好,稳态渗透速率达到4.1712μg·cm^-2·h^-1。NMP与月月月月酮比为7:3,浓度为3%时,对胡椒碱的促透作用最强。双乌跌打损伤药方有明显的消炎镇痛作用,促透剂的加入可以进一步加强药效(P<0.1)。结论采用浓度为3%,以此月月月月酮复合促透剂可取得对胡椒碱的最大促透效果,并提高药方消炎镇痛的作用。     

HPLC测定荜茇三味散中胡椒碱的含量

目的:建立荜茇(荜茇、诃子、山楂)三味散中胡椒碱的含量测定的方法。方法:采用高效液相色谱法测定,色谱柱为Kromasil(C18,5um,250mm×4.6mm)色谱柱,流动相为甲醇-水(77:23),检测波长为343nm。结果:胡椒碱在进样量6.96ug~1.99ug范围内与峰面积呈良好的线性关系,r=0.9999,平均回收率为102.9%,RSD为1.4%。结论:HPLC法简单准确,精密度高,分离度良好,可用于荜茇三味散的质量控制。     

3,4—二氯苯丙烯酰另丁胺抗抑郁作用的药理研究

研究一种新的胡椒碱衍化物:3,4—二氯苯丙烯酰另丁胺(7903)对五种抑郁动物模型的影响。7903在小于TD_(50)剂量下,对所用动物模型均显示出抗抑郁效应,即在不增加动物的自主活动情况下,急性ip 7903可明显缩短小鼠及大鼠强迫游泳不动状态时间;急性ip或po明显缩短小鼠悬尾不动时间;慢性(二周)ip可明显缩短电刺激小鼠角膜引起的最长持续不动状态时间;急性ip可明显改善利血平引起的小鼠体温下降。     

胡椒碱对C57BL/6小鼠胆囊结石形成的影响

目的观察胡椒碱对实验性C57BL/6小鼠胆囊结石形成的影响。方法C57BL/6小鼠30只,对照组10只,普通饮食;结石组10只,喂含1%的胆固醇饮食;用药组10只,喂含1%的胆固醇饮食和胡椒碱(30mg/kg体重)。4周后分别用逆转录-聚合酶链反应(RT-PCR)及化学方法检测肝组织Scp2mRNA水平和胆脂的变化,胆固醇饱和指数(CSI)用Carey表计算。结果结石组9只出现胆囊结石,10只出现胆固醇结晶,胡椒碱组和对照组无结石和结晶形成,与结石组相比,胡椒碱组肝Scp2mRNA水平和胆囊胆汁CSI明显降低。结论胡椒碱在明显抑制实验性C57BL/6小鼠胆囊结石形成的同时,显著降低肝Scp2mRNA水平和胆汁CSI,这是否与胡椒碱的防止结石形成有关有待进一步的研究。