荧光扫描测定克服痛中蛇床子素的含量

采用薄层荧光扫描法测定克乳痛胶囊中蛇床子素的含量。蛇床子素在0．50－4．00μg有良好的线性关系,回收率为101．10％,RSD＝1．70％。该法简便,灵敏,稳定,可用于该制剂的定量控制。     

复方制剂中蛇床子素的稳定性研究

目的：考察蛇床子素在制剂中的稳定性。方法：采用气相色谱法测定复方蛇床子液中蛇床子素的含量变化,并用恒温加速试验法对其稳定性进行了研究。结果：测得蛇床子素分解反应的活化能为105．75kl／mol。结论：20℃时该制剂中的蛇床子素的化学稳定性t。为3．8年。     

D-最优混料设计优化寒痹舒凝胶膏剂的基质组成及其体外评价

目的优化寒痹舒凝胶膏剂的基质配方并研究其体外释放和透皮吸收行为。方法采用D-最优混料设计,以含药凝胶膏剂的初黏力、持黏力和胶强度3个指标对基质组成进行优化,确定最优基质配方并进行验证试验;采用改良Franz扩散池法,以蛇床子素为指标进行体外释放和经皮渗透性能的研究。结果寒痹舒凝胶膏剂的基质配方为NP700 6.97g、甘羟铝0.30 g、酒石酸0.25g、甘油35.00 g、PVPK90 3.87g、蒸馏水43.61 g;寒痹舒流浸膏10 g。凝胶膏中蛇床子素24 h体外释放达到(63.30±0.05)%,经皮渗透速率为0.16μg/(cm~2·h),24h累积渗透量为(3.61±0.32)μg/cm~2。结论 D-最优混料设计优化出的寒痹舒凝胶膏剂具有良好的黏附性和成型性。蛇床子素体外释放符合一级方程模型,体外透皮符合零级方程模型。     

蛇床子素通过激活 PI3K/Akt 通路减轻谷氨酸诱导的海马神经元损伤

目的：研究蛇床子素(osthole,OST)减轻谷氨酸诱导的HT22细胞损伤的机制。方法：建立谷氨酸诱导的 HT22细胞损伤模型;HT22损伤细胞经OST处理,MTS法检测细胞活力;乳酸脱氢酶(lactate dehydrogenase,LDH)释放 实验检测HT22细胞LDH漏出率;caspase-3活性检测试剂盒测定各组caspase-3活性;Western印迹法测定细胞内磷脂酰肌 醇(-3)激酶(phosphatidylinositol-3-kinase,PI3K),蛋白激酶B(protein kinase B,Akt),磷酸化PI3K(p-PI3K)和磷酸化Akt(p- Akt)蛋白表达情况。结果：OST在0~10 mmol/L范围内呈剂量依赖性提高谷氨酸诱导的HT22细胞活力,降低LDH漏出 率,改善HT22细胞损伤。此外,OST显著上调谷氨酸损伤细胞p-PI3K和p-Akt蛋白表达,而PI3K抑制剂LY294002明显 抑制OST谷氨酸损伤细胞p-Akt蛋白表达的上调作用。结论：OST对谷氨酸损伤的HT22细胞具有保护作用,其保护作 用机制可能是通过激活PI3K/Akt信号通路来实现的。     

Osthole induces human nasopharyngeal cancer cells apoptosis through Fas–Fas ligand and mitochondrial pathway

Nasopharyngeal carcinoma (NPC) is endemic in Southern China and Southeast Asia. The present study investigated the activity of osthole in suppressing NPC along with the underlying mechanism. Cell growth inhibition was measured using the MTT assay. Apoptosis was detected through 4ʹ,6‐diamidino‐2‐phenylindole staining and flow cytometry. Western blotting was used to identify the signaling pathway. Osthole markedly inhibited cell proliferation and induced apoptosis in the NPC cell line. Western blotting results revealed the increased activation of caspases 3, 8, and 9 and poly (ADP‐ribose) polymerase. Osthole treatment significantly reduced the expression of the antiapoptotic protein Bcl‐2 and increased the expression of the proapoptotic proteins Bax, Bak, BimL, BimS, and t‐Bid. Osthole treatment also increased the expression of Fas, FADD, TNF‐R1, TNF‐R2, DcR2, RIP, and DR5. In addition, osthole treatment significantly increased the expression levels of phosphorylated ERK1/2 and JNK1/2. These results suggested that osthole exerts cytotoxic effects on NPC cell lines mainly through apoptosis mediated by the Fas–Fas ligand and mitochondrial pathway. Osthole could be a potential anticancer agent for NPC.     

Osthole induces G2/M cell cycle arrest and apoptosis in human hepatocellular carcinoma HepG2 cells

Context: Osthole [7-methoxy-8-(3-methyl-2-butenyl) coumarin] isolated from the fruit of Cnidium monnieri (L.) Cuss, one of the commonly used Chinese medicines listed in the Shennong’s Classic of Materia Medica in the Han Dynasty, had remarkable antiproliferative activity against human hepatocellular carcinoma HepG2 cells in culture.

Objectives: This study evaluated the effects of osthole on cell growth, nuclear morphology, cell cycle distribution, and expression of apoptosis-related proteins in HepG2 cells.

Materials and methods: Cytotoxic activity of osthole was determined by the MTT assay at various concentrations ranging from 0.004 to 1.0?µmol/ml in HepG2 cells. Cell morphology was assessed by Hoechst staining and fluorescence microscopy. Apoptosis and cell-cycle distribution was determined by annexin V staining and flow cytometry. Apoptotic protein levels were assessed by Western blot.

Results: Osthole exhibited significant inhibition of the survival of HepG2 cells and the half inhibitory concentration (IC₅₀) values were 0.186, 0.158 and 0.123?µmol/ml at 24, 48 and 72?h, respectively. Cells treated with osthole at concentrations of 0, 0.004, 0.02, 0.1 and 0.5?μmol/ml showed a statistically significant increase in the G2/M fraction accompanied by a decrease in the G0/G1 fraction. The increase of apoptosis induced by osthole was correlated with down-regulation expression of anti-apoptotic Bcl-2 protein and up-regulation expression of pro-apoptotic Bax and p53 proteins.

Conclusion: Osthole had significant growth inhibitory activity and the pro-apoptotic effect of osthole is mediated through the activation of caspases and mitochondria in HepG2 cells. Results suggest that osthole has promising therapeutic potential against hepatocellular carcinoma.     

蛇床子素对小鼠酒精性脂肪肝的治疗作用

目的观察蛇床子素对小鼠酒精性脂肪肝的治疗作用并初步探讨其作用机制。方法建立小鼠酒精性脂肪肝模型后,分别以蛇床子素不同剂量（10～40 mg/kg）给予治疗6周,然而测定小鼠血脂、肝脂及肝组织中超氧化物歧化酶（SOD）、丙二醛（MDA）和谷胱甘肽过氧化物酶（GSH-PX）含量,同时观察肝脏的病理变化。结果经蛇床子素处理过的小鼠血清中总胆固醇（TC）、甘油三酯（TG）、低密度脂蛋白-胆固醇（LDL-C）水平和肝组织中TC、TG和MDA的含量明显低于模型组（P〈0.05或0.01）,同时肝组织中的SOD含量明显高于模型组（P〈0.05或0.01）。肝组织形态学评估表明,蛇床子素显著减少了肝脂质的沉积。结论蛇床子素对小鼠酒精性脂肪肝有较好的治疗作用,其作用机制可能与其增加机体的抗氧化能力有关。     

蛇床子素通过抑制髓核致炎大鼠脊髓背角CXCL1/CXCR2的表达发挥抗炎镇痛作用

目的研究蛇床子素(osthole,Ost)对大鼠髓核源性神经根痛的抗炎镇痛作用。方法雄性SD大鼠60只随机分为3组:髓核致炎组(NP组,n=36)、Sham组(n=12)、Blank组(n=12),检测术前和术后3、7、14、21、28 d的50%MWT;q-PCR检测术后各时间点脊髓背角CXCL1、CXCR2和TNF-α的mRNA水平,Western blot检测术后各时间点脊髓背角CXCL1/CXCR2的蛋白水平。另外雄性SD大鼠64只髓核致炎后随机均分为4组:生理盐水组(NP+NS),DMSO组(NP+DMSO),Ost组(NP+Ost),CXCL1中和抗体组(NP+AF-515),于术后d 3经硬膜外注射相应药物50μL。给药前后多个时点均检测50%MWT。于术后d 7取L5脊髓背角,通过Western blot检测各组脊髓背角CXCL1/CXCR2的蛋白水平。结果NP组术后各时间点的50%MWT较Sham组均降低(P<0.05)。NP组术后各时间点脊髓背角CX-CL1、CXCR2和TNF-α的mRNA水平均较Sham组升高(P<0.05),且NP组术后各时间点脊髓背角CXCL1/CXCR2的蛋白水平较Sham组升高(P<0.05)。NP+Ost组给药后50%MWT比给药前升高(P<0.05),NP+AF515组在给药后3 h 50%MWT升高,持续到给药后12 h(P<0.05)。NP+Ost组术后7d脊髓背角CXCL1/CXCR2蛋白表达降低(P<0.05)。结论脊髓背角CXCL1/CXCR2可能参与了大鼠髓核源性神经根痛的发生发展,蛇床子素通过抑制脊髓背角CXCL1/CXCR2的表达而缓解髓核致炎大鼠神经根性疼痛。     

蛇床子素对耐阿霉素人乳腺癌细胞耐药的逆转作用

目的:研究蛇床子素(Ost)对人乳腺癌细胞阿霉素耐药株多药耐药(MDR)的逆转作用及其机制。方法:采用MTT比色法测定药物的细胞毒性,高效液相-紫外检测法检测细胞内ADR浓度。结果:Ost对MCF-7及MCF-7/ADR细胞均有增殖抑制作用,IC50值分别为(58.1±2.3)μmol.L-1和(59±5)μmol.L-1;在5~15μmol.L-1范围内,Ost可以不同程度地增强ADR对MCF-7细胞杀伤作用,与ADR联合用药降低ADR对MCF-7/ADR的IC50值,显著增加MCF-7/ADR细胞内ADR的积累。结论:Ost对人乳腺癌细胞株MCF-7及其阿霉素耐药株MCF-7/ADR细胞均有增殖抑制作用,而且Ost通过明显增加MCF-7/ADR细胞内ADR的浓度,逆转其阿霉素耐药性。