Triterpenoids with antioxidant activities from Myricaria squamosa

A new triterpenoid, namely myricarin C (compound 1), together with three known compounds myricarin A (compound 2) and myricarin B (compound 3), 3α-hydroxy-D-friedoolean-14-en-28-oic acid (compound 4), was isolated from the overground part of Myricaria squamosa. Compound 2 and compound 3 existed in the solution by the form of cis-trans isomers. Their structures were elucidated by means of extensive spectroscopic methods, including 1D-NMR, 2D-NMR, and HR-ESI-MS. The antioxidant properties of all compounds were calculated based on the DPPH radical scavenging activities. Results showed that myricarin A and myricarin C had general antioxidant activities with EC₅₀ values of 40.90 μg/ml, 42.22 μg/ml, respectively, compared to the control, rutin (5.17 μg/ml). The EC₅₀ values of myricarin B was 195.81 μg/ml. Compound 4 had no antioxidant activities.     

阿尔茨海默病与糖原合酶激酶3

目的:阿尔茨海默病具有神经原纤维缠结和tau蛋白的异常过度磷酸化两大病理特征,可导致神经细胞骨架异常并与神经元死亡有关。近来的一些理论提出了糖原合酶激酶3参与上述两大病理特征的形成,从而在阿尔茨海默病发病中具有重要作用的相关假设。资料来源:应用网络Medline检索1986/2002关于阿尔茨海默病的相关文献,检索词:阿尔茨海默病(Alzheimerdisease),糖原合酶激酶3(glycogensynthasekinase-3),tau蛋白。资料选择:选择关于糖原合酶激酶3与阿尔茨海默病发病关系的相关文献,以非随机研究原著和没有对照组的研究为纳入标准,未排除非盲法研究,排除重复性文献和综述性文献。资料提炼:在66篇文献中,内容呈不同程度重复的有13篇,给予删除;对53篇文献进行分类整理分析,其中33篇选用为参考文献。资料综合:糖原合酶激酶3β能在大多数阿尔茨海默病相关位点磷酸化tau蛋白,本身的活性又同时受到蛋白激酶与蛋白磷酸酯酶的双重调节;糖原合酶激酶3β在引起tau蛋白异常过度磷酸化的同时,在细胞水平还引起神经元的凋亡;整体实验也显示糖原合酶激酶3β可能导致轴突转运障碍。结论:糖原合酶激酶3β不但直接导致tau蛋白的异常过度磷酸化,使组织内出现类似于阿尔茨海默病患者脑内神经原纤维缠结样细胞,同时又在细胞凋亡中发挥     

皮质下动脉硬化性脑病伴发抑郁的治疗分析

目的:观察抗抑郁治疗对皮质下动脉硬化性脑病伴发抑郁症患者抑郁症状、神经功能缺损及日常生活能力的改善情况。方法:选择2002-01/2005-06来自于河南省人民医院神经科门诊和住院的患者110例,随机分为米氮平治疗组(n=38),阿米替林治疗组(n=36)、对照组(n=36),各组均行常规神经营养药物和促智药物治疗,米氮平治疗组同时口服米氮平30mg/次,1次/晚;阿米替林组同时口服阿米替林25mg/次,分早晚两次口服,最大剂量为100mg/d,总疗程均为12～24周,治理期间不合并其他抗抑郁或精神障碍药。治疗前、治疗后1,2,4、8,12周及6个月分别采用汉密顿抑郁量表评定患者的抑郁症状。于治疗前及治疗后12周、6个月进行神经功能缺损和日常生活能力评定。记录治疗期间米氮平治疗组和阿米替林治疗组不良反应发生情况。并于6个月对各组患者的并发症及预后进行评定。结果:纳入患者110例,由于调查过程中停药、失访、患并发症、死亡等原因,米氮平治疗组、阿米替林治疗组和对照组分别脱落5、6和6例,分别进入结果分析33、30和30例。①汉密顿抑郁量表评分结果:米氮平治疗组在治疗第1,2,4,8,12周及6个月时汉密尔顿抑郁量表得分均明显低于治疗前及对照组(P<0.01～0.05),阿米替林组在治疗后第2,4,8,12周及6个月时汉密尔顿抑郁量表得分低于治疗前及对照组(P<0.01～0.05)。②神经功能缺损及日常生活能力评定。结果:米氮平治疗组及阿米替林治疗组在治疗后第12周、6个月时神经功能缺损评分均明显低于治疗前及对照组(P<0.01～0.05),日常生活能力得分明显高于治疗前及对照组(P<0.01～0.05)。③不良反应发生情况:治疗期间米氮平导致口干、便秘、视力模糊、恶心、呕吐、心电图异常、尿潴留等不良反应发生情况明显少于阿米替林治疗组(P<0.01～0.05)。④各组治疗后并发症及预后比较:对照组肺部感染、尿路感染、脑卒中、心血管事件的发生率高于米氮平治疗组、阿米替林治疗组(P<0.01～0.05),其死亡率也明显增高(P<0.01～0.05)。结论:抗抑郁治疗能有效改善皮质下动脉硬化性脑病伴抑郁的症状,有利于患者神经功能康复,提高生活能力,减少并发症,米氮平治疗副反应少,更安全。     

D. candidum has in vitro anticancer effects in HCT-116 cancer cells and exerts in vivo anti-metastatic effects in mice

BACKGROUND/OBJECTIVES

D. candidum is a traditional Chinese food or medicine widely used in Asia. There has been little research into the anticancer effects of D. candidum, particularly the effects in colon cancer cells. The aim of this study was to investigate the anticancer effects of D. candidum in vitro and in vivo.

MATERIALS/METHODS

The in vitro anti-cancer effects on HCT-116 colon cancer cells and in vivo anti-metastatic effects of DCME (Dendrobium canidum methanolic extract) were examined using the experimental methods of MTT assay, DAPI staining, flow cytometry analysis, RT-PCR, and Western blot analysis.

RESULTS

At a concentration of 1.0 mg/mL, DCME inhibited the growth of HCT-116 cells by 84%, which was higher than at concentrations of 0.5 and 0.25 mg/mL. Chromatin condensation and formation of apoptotic bodies were observed in cancer cells cultured with DCME as well. In addition, DCME induced significant apoptosis in cancer cells by upregulation of Bax, caspase 9, and caspase 3, and downregulation of Bcl-2. Expression of genes commonly associated with inflammation, NF-κB, iNOS, and COX-2, was significantly downregulated by DCME. DCME also exerted an anti-metastasis effect on cancer cells as demonstrated by decreased expression of MMP genes and increased expression of TIMPs, which was confirmed by the inhibition of induced tumor metastasis in colon 26-M3.1 cells in BALB/c mice.

CONCLUSIONS

Our results demonstrated that D. candidum had a potent in vitro anti-cancer effect, induced apoptosis, exhibited anti-inflammatory activities, and exerted in vivo anti-metastatic effects.     

Fluorescent perylene derivative functionalized titanium oxide gel for sensitive and portable ascorbic acid detection

An inorganic titanium oxide (TiO) gel sensor was demonstrated for convenient detection of ascorbic acid (AA). It is composed of TiO (PI–TiO) functionalized with a perylene diimide derivative containing carboxylic groups as a new soft dopant material. A traditional solvothermal reaction is adopted to prepare the PI–TiO composite, which exhibits a different spectrum according to the reaction time. The final gel possesses a strong chelating affinity with AA molecules, in which phenol hydroxyl groups are shown to compete with those already present in PI. We further utilize the functionalized gel to prepare a series of films with a simple and portable AA response. A visual colour variation can be recognized by the naked eye, together with obvious fluorescence changes for selective and sensitive AA detection. Finally, the as-prepared gel film displays good stability and reproducibility for real sample responses with satisfying results.

A fluorescent inorganic titanium oxide gel sensor was prepared from perylene diimide functionalized composite materials, and applied for sensitive and portable ascorbic acid detection.     

同期两镜或三镜下留置输尿管导管胆管引流207例

目的总结运用同期两镜或三镜术中留置输尿管导管胆管引流的治疗经验。方法从1992年10月-2014年8月,我们运用同期两镜或三镜术中留置输尿管导管胆管引流的手术方式,即腹腔镜术中经胆囊管残端输尿管导管胆管引流术（LUD）,对207例患者进行治疗。结果 181例胆管引流获得成功（87.4%）。输尿管导管插管失败12例（5.8%）,其中中转为鼻胆管引流7例,T管引流2例,放弃胆管引流3例。输尿管导管打折或堵塞导致无任何液体流出2例（1.0%）。输尿管导管早期滑脱导致胆汁性腹膜炎2例（1.0%）,再次腹腔镜下放置输尿管导管及腹腔引流管1例和放置T管及腹腔引流管1例而治愈。术后胆漏4例（1.9%）,经腹腔引流管引流自愈。乳头切开术后发生轻症胰腺炎3例（1.4%）。术后经输尿管导管胆管造影无残石,胆管切口一期缝合术后有轻度狭窄影像2例未处理,乳头区狭窄影像1例未处理。无其他严重并发症,无死亡。结论只要选择合适的病例,同期两镜或三镜术中留置输尿管导管胆管引流是可行、有效和安全的。     

Variants of COL3A1 Are Associated with the Risk of Stroke Recurrence and Prognosis in the Chinese Population: a Prospective Study

Type III collagen plays an important role in activating platelets, forming thrombus, and maintaining the mechanical properties of arteries. This study aimed to test the hypothesis that genetic variants of COL3A1 (gene encoding type III collagen) contribute to recurrence and prognosis of stroke. We investigated the associations of three variants (rs2138533, rs11887092, and rs1800255) in the COL3A1 gene with stroke recurrence and prognosis in 1,544 patients with three subtypes of stroke: lacunar infarction (n?=?442), atherothrombotic infarction (n?=?670), and hemorrhage (n?=?432). These associations were evaluated by Kaplan–Meier analysis and Cox regression models. Patients were followed up for 4.5 years. The A allele of rs1800255 in the COL3A1 gene coding region was significantly associated with a reduced risk of stroke recurrence in patients with lacunar infarction (adjusted hazard ratio [HR] 0.58, 95 % confidence interval [CI] 0.36–0.93, P?=?0.024), but there was an increased risk of all-cause mortality of atherothrombotic patients (adjusted HR 1.43, 95 % CI 1.01–2.00, P?=?0.044). The TT genotype of rs2138533 showed a significantly increased risk of death caused by cardiovascular disease or stroke in lacunar infarct patients (adjusted HR 2.98, 95 % CI 1.27–6.98, P?=?0.012), but there was a reduced risk of all-cause mortality for patients with intracerebral hemorrhage (adjusted HR 0.34, 95 % CI 0.12–0.93, P?=?0.036). The G allele of rs11887092 increased the risk of stroke recurrence in patients with atherothrombotic stroke (adjusted HR 1.59, 95 % CI 1.04–2.44, P?=?0.035). In conclusion, variants of COL3A1 might play a vital role in determining the risk of recurrence and prognosis after stroke.     

Luminescence properties,energy transfer and thermal stability of white emitting phosphor Sr3(PO4)2:Ce3+/Tb3+/Mn2+ for white LEDs

A series of Sr₃(PO₄)₂:Ce³⁺/Mn²⁺/Tb³⁺ phosphors were synthesized by a high temperature solid phase method. After introducing Ce³⁺ as sensitizer in Sr₃(PO₄)₂:Ce³⁺/Mn²⁺, the efficient energy transfer from Ce³⁺ to Mn²⁺ was observed and analyzed in detail, and Sr₃(PO₄)₂:Ce³⁺/Mn²⁺ was demonstrated to be color tunable, changing from blue to orange red. In addition, Tb³⁺ ion, which mainly emits green light, was further added into the Sr₃(PO₄)₂:Ce³⁺/Mn²⁺. Due to the addition of this green emission, the white emitting phosphors with good quality were obtained. At the same time, the energy transfer mechanisms among Ce³⁺, Tb³⁺ and Mn²⁺ ions were also analyzed in detail. The results show that Sr₃(PO₄)₂:Ce³⁺/Mn²⁺/Tb³⁺ is a promising candidate for white light emitting diodes.

The tunable emission phosphor was realized by the energy transfer.