杜仲叶清除DPPH自由基动力学特性及抗氧化活性成分筛选

目的 研究杜仲叶抗氧化清除1,1-二苯基-2-苦肼基(DPPH)自由基的动力学特性,筛选其抗氧化活性成分,建立与抗氧化活性相关的质量控制方法.方法 比较不同杜仲叶样品浓度、反应温度和反应时间对DPPH自由基清除率的影响,测定杜仲叶清除DPPH自由基活性的半数清除率(IC50).采用DPPH-HPLC法测定杜仲叶与DPP...     

Studies on Resin Purification Process Optimization of Eucommia Ulmoides Oliver and Its Antihypertensive Effect Mechanism

Background

Through research it is found that the barks, stems, fruits and flowers of Eucommia ulmoides contain various compositions, such as lignin, cycloalkane and phenylpropanoids. The modern pharmacological research shows that Eucommia ulmoides has many functions, such as anti-aging, antitumor and bone cell proliferation. This paper studied the resin purification process optimization conditions and antihypertensive effect of Eucommia ulmoides Oliver.

Materials and Methods

The orthogonal experiment method was adopted to determine the purification effect of various macro-porous resins for eucommia ulmoides Oliver, and the SHR model was used to determine antihypertensive level of eucommia ulmoides Oliver.

Results

The optimal process of resin extraction and purification of Eucommia ulmoides Oliver was verified through the loading liquid concentration at 6 mg/ml, 20% ethanol used as the eluent; the flow rate control was 3.0, column volume per hour and the diameter-height ratio of adsorption column was 1:6; the extracts of Eucommia ulmoides Oliver can reduce SHR blood pressure, its antihypertensive effect is relatively stable and has no significant impact on HR, but the antihypertensive effect is lower than that of control medicine captopril. Also, the extracts of eucommia ulmoides Oliver can significantly increase the content of serum NO and reduce the content of ET.

Conclusion

The Eucommia ulmoides Oliver can relax blood vessels, reduce the peripheral resistance, reduce the returned blood volume, and eventually achieve the antihypertensive effect.     

Neuroimaging Features in Congenital Trichomegaly: The Oliver‐McFarlane Syndrome

A 23‐year‐old woman presented to our hospital with 9 months history of progressive ataxia, visual loss since childhood due to retinitis pigmentosa and primary amenorrhea. On examination, there were also sparse scalp hair, very long and curled upwards eyelashes and short stature. Oliver‐McFarlane syndrome was suspected. Brain MRI disclosed cerebellar atrophy and hyperintense signal in corticospinal tracts on FLAIR and T2‐weighted images. Therefore, brain imaging must be thoroughly investigated in patients with suspected Oliver‐McFarlane syndrome, in order to determinate whether cerebellar atrophy and hyperintense signal in corticospinal tracts are part of this neurological condition.     

杜仲叶中无机元素动态含量测定

用原子吸收分光光度法测定了杜仲皮、不同生长期杜仲叶中１２种无机元素含量。发现杜仲叶中富含杜仲皮中所含的无机元素，且除铜元素外，叶中其它人体必需元素含量均较皮中含量高。讨论了不同时期杜仲叶中各无机元素变化规律，为根据不同目的确定适当采叶时期提供了科学依据。     

杜仲绿原酸通过PI3K/AKT/Nrf-2通路增强视网膜母细胞瘤细胞系HXO-Rb44放射敏感性

目的　探究杜仲绿原酸（CGA）通过调控PI3K/AKT/Nrf-2通路,对视网膜母细胞瘤细胞系HXO-Rb44放射敏感性的增强作用。 方法　通过不同浓度的CGA处理HXO-Rb44细胞,检测IC10,作为后续实验中CGA浓度。将细胞分为Ctrl、Radio、CGA、Radio+CGA组,Radio组给予4 MV X射线照射24 h,CGA组使用CGA处理24 h,Radio+CGA组在CGA处理24 h后再给予4 MV X射线照射24 h,流式细胞术检测细胞周期与细胞凋亡,蛋白质印迹检测Ki67、依赖还原型辅酶I/II醌氧化还原酶I（NQO1）、活化型半胱天冬酶（cl-caspase-3）、硫氧还蛋白还原酶1（TrxR1）、活化磷脂酰肌醇3-激酶（p-PI3K）、蛋白激酶B（AKT）、p-AKT、核因子E2相关因子2（Nrf2）蛋白表达。进一步通过PI3K激活剂740Y-P处理细胞,检测细胞周期、凋亡、增殖和相关蛋白表达、PI3K/AKT/Nrf2通路蛋白表达。 结果　随着CGA浓度的增高,细胞的相对存活率降低,药物毒性呈浓度依赖性,IC10为81.59 μmol/L。与Ctrl组相比,Radio和CGA组G2/M期细胞比例显著升高,细胞凋亡比率显著升高（P<0.01）;与Radio组相比,Radio+CGA组G2/M期细胞比例和细胞凋亡比率进一步显著升高（P<0.01）。同时在蛋白水平上,与Ctrl组相比,Radio和CGA组Ki67、NQO1、TrxR1、p-PI3K、Nrf2蛋白表达及p-AKT/AKT比率显著降低（P<0.01）;放射和CGA联合作用进一步降低以上各指标（P<0.01）。此外,PI3K激活剂可逆转放射对细胞周期、增殖、凋亡以及PI3K/AKT/Nrf2通路的作用,CGA可恢复放射引起的上述各指标的变化（P<0.01）。 结论　CGA可增强HXO-Rb44细胞的放射敏感性,其作用机制与抑制PI3K/AKT/Nrf2通路相关。     

杜仲叶总提取物治疗去势大鼠骨质疏松症的实验研究

目的：研究杜仲叶总提取物对去势大鼠骨质疏松（osteoporosis,OP）模型的骨代谢调节作用机制。方法4月龄雌性SD大鼠32只,随机分成正常对照组（Control组,生理盐水灌胃）、去卵巢对照组（OP组,生理盐水灌胃）、雌二醇组（Estrogen组,雌二醇水溶液灌胃）、杜仲叶总提取物组（DZ组,杜仲叶总提物水溶液灌胃）。各组治疗3个月后,通过眼眶采血,测定血清中Ca2＋、P3＋和ALPase活力。并取大鼠的股骨和胫骨,用双能X线骨密度仪测定骨密度。结果血清中Ca2＋、P3＋和ALPase活力,DZ组与OP组比较,均有显著差异（P〈0.05）;股骨和胫骨BMD,DZ组与OP组比较,有显著差异（P〈0.05）。结论杜仲叶总提取物可以改善OP模型动物骨代谢,增加骨质疏松模型动物的骨密度,减少骨破坏,加强骨稳定,有效防治骨质疏松症。     

Investigation into the mechanism of Eucommia ulmoides Oliv. based on a systems pharmacology approach

Ethnopharmacology relevance

Though Traditional Chinese Medicine (TCM) has long been playing a significant role in the maintenance of health for people in Asia as well as many other places, the mechanism of its action still remains ambiguous for most of the plants used in TCM, such as Eucommia ulmoides Oliv., a kind of herb that is widely used to help regulate hypertension and the immune system nowadays. However, its functioning mechanism is still unknown. Thus it is necessary to exploit the mechanism of Eucommia ulmoides Oliv.

Methods

A systems pharmacology approach combining drug-likeness evaluation, oral bioavailability prediction, multiple drug targets prediction as well as network pharmacology techniques has been used.

Results

This comprehensive systematic approach helps successfully to identify 41 candidate compounds contained in Eucommia ulmoides Oliv. while 39 potential targets hit by these ingredients and helps to uncover the synergistic mechanism of action on a systematic level.

Conclusions

Our work successfully explains the mechanism of the efficiency of Eucommia ulmoides Oliv. for the treatment of hypertension and enhancing immune. These results not only provide a new insight for the understanding of the chemical and pharmacological basis of Eucommia ulmoides Oliv., but also provide an efficient way for drug discovery from herbal medicine.     

杜仲雄花水提液治疗特应性皮炎的实验研究

目的观察杜仲雄花水提液对IgE介导的小鼠皮炎动物模型的作用。方法以2,4-二硝基氯苯(DNCB)诱导小鼠特应性皮炎为动物模型,研究杜仲雄花茶水提液对其血清某些细胞因子IL-4、IFN-γ及IgE水平的影响。结果杜仲雄花水提液可抑制血清IgE及血清IL-4产生,上调IFN-γ。结论杜仲雄花茶水提液对特应性皮炎具有抗炎、抗过敏作用。