There are two factors,source composition and magmatic differentiation,potentially controlling W-Sn mineralization.Which one is more important is widely debated and may need to be determined for each individual deposit...There are two factors,source composition and magmatic differentiation,potentially controlling W-Sn mineralization.Which one is more important is widely debated and may need to be determined for each individual deposit.The Xitian granite batholith located in South China is a natural laboratory for investigating the above problem.It consists essentially of two separate components,formed in the Triassic at ca.226 Ma and Jurassic at ca.152 Ma,respectively.The Triassic and Jurassic rocks are both composed of porphyritic and fine-grained phases.The latter resulted from highlydifferentiated porphyritic ones but they have similar textural characteristics and mineral assemblages,indicating that they reached a similar degree of crystal fractionation.Although both fine-grained phases are highly differentiated with elevated rare metal contents,economic W–Sn mineralization is rare in the Triassic granitoids and this can be attributed to less fertile source materials than their Jurassic counterparts,with a slightly more enriched isotopic signature and whole-rockεNd(226 Ma)of−10.4 to−9.2(2σ=0.2)compared withεNd(152 Ma)of−9.2 to−8.2(2σ=0.2)for the Jurassic rocks.The initial W-Sn enrichment was derived from the metasedimentary rocks and strongly enhanced by reworking of the continental crust,culminating in the Jurassic.展开更多
目的通过网络药理学、分子对接和实验验证探究何首乌-虎杖治疗脑小血管病(cerebral small vessel disease,CSVD)的作用机制。方法运用TCMSP数据库筛选何首乌和虎杖的化学成分及相关靶点蛋白,在GeneCards和OMIM数据库获取痴呆、中风、健...目的通过网络药理学、分子对接和实验验证探究何首乌-虎杖治疗脑小血管病(cerebral small vessel disease,CSVD)的作用机制。方法运用TCMSP数据库筛选何首乌和虎杖的化学成分及相关靶点蛋白,在GeneCards和OMIM数据库获取痴呆、中风、健忘相关靶点,通过Cytoscape构建中药-活性成分-靶点网络图和蛋白相互作用图,再利用DAVID数据库对作用靶点进行京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路富集。利用Autodock将关键有效成分和重要靶点进行分子对接,评估其结合活性。最后采用β-淀粉样多肽1-42(amyloidβ_(1-42),Aβ_(1-42))诱导BV-2细胞构建阿尔茨海默病(Alzheimer's disease,AD)细胞模型,采用Western blot法研究何首乌-虎杖对AD细胞模型关键靶点表达的影响。结果筛选出24个化学成分,120个活性成分-疾病共有靶点。KEGG结果涉及磷脂酰肌醇3-激酶/蛋白激酶B(phosphatidylinositol 3-kinase and protein kinase B,PI3K-Akt)、丝裂原激活蛋白激酶(mitogen-activated protein kinase,MAPK)、白介素-17(interleukin-17,IL-17)、缺氧诱导因子(hypoxia-inducible factor-1α,HIF-1)、肿瘤坏死因子(tumor necrosis factor,TNF)等多条炎症相关信号通路。筛选出槲皮素、大黄素、β-谷甾醇、大黄素甲醚、芹菜素5个关键化学成分,c-Jun氨基末端激酶(c-Jun N-terminal kinase,JNK)、TNF-α、细胞肿瘤抗原p53(cellular tumor antigen p53,P53)、白介素-6(interleukin-6,IL-6)和表皮生长因子受体(epidermal growth factor receptor,EGFR)5个关键靶点。分子对接结果显示,上述化合物与靶点的结合能均为负值。实验验证结果显示,何首乌-虎杖能显著抑制AD细胞模型5个关键靶点的表达。结论何首乌-虎杖可能通过调节核心靶点JNK、TNF-α、P53、IL-6抑制炎症反应、抑制细胞凋亡,从而发挥治疗CSVD作用。展开更多
目的:系统收集中药治疗紧张性头痛(TTH)临床研究的现有证据,评价中药治疗紧张性头痛临床研究的现状。方法:计算机检索国家知识基础设施数据库(CNKI)、中国学术期刊数据库(CSPD)、中文科技期刊数据库(CCD)、中国生物医学文献数据库(CBM)...目的:系统收集中药治疗紧张性头痛(TTH)临床研究的现有证据,评价中药治疗紧张性头痛临床研究的现状。方法:计算机检索国家知识基础设施数据库(CNKI)、中国学术期刊数据库(CSPD)、中文科技期刊数据库(CCD)、中国生物医学文献数据库(CBM)、EMbase、PubMed、Cochrane Library、Web of science、ClinicalTrials.gov和中国临床试验注册中心共10个数据库,检索时限为建库至2020年10月,纳入有关中药治疗TTH的临床研究,采用证据图方法呈现临床研究的证据分布情况。结果:共纳入471项临床研究,其中随机对照试验378项,非随机对照试验41项,队列研究1项,病例系列研究51项,文献总发表数量在总体上随时间变化呈增长趋势,但呈“锯齿状”波动;方法学质量评价结果显示目前中药治疗紧张性头痛的临床研究质量较低;中药治疗紧张性头痛对总有效率、安全性事件、头痛持续时间、头痛强度、头痛发作频率、焦虑抑郁量表关注度较高,对经济学指标及远期预后指标关注较低。疗程集中在15~30 d。结论:目前中药治疗TTH的临床研究质量较低,未来需要开展更多高质量的临床研究为中药治疗TTH提供更充分的证据。展开更多
基金financially supported by the National Natural Science Foundation of China(Grant Nos.92162210,42172096 and 41773028).
文摘There are two factors,source composition and magmatic differentiation,potentially controlling W-Sn mineralization.Which one is more important is widely debated and may need to be determined for each individual deposit.The Xitian granite batholith located in South China is a natural laboratory for investigating the above problem.It consists essentially of two separate components,formed in the Triassic at ca.226 Ma and Jurassic at ca.152 Ma,respectively.The Triassic and Jurassic rocks are both composed of porphyritic and fine-grained phases.The latter resulted from highlydifferentiated porphyritic ones but they have similar textural characteristics and mineral assemblages,indicating that they reached a similar degree of crystal fractionation.Although both fine-grained phases are highly differentiated with elevated rare metal contents,economic W–Sn mineralization is rare in the Triassic granitoids and this can be attributed to less fertile source materials than their Jurassic counterparts,with a slightly more enriched isotopic signature and whole-rockεNd(226 Ma)of−10.4 to−9.2(2σ=0.2)compared withεNd(152 Ma)of−9.2 to−8.2(2σ=0.2)for the Jurassic rocks.The initial W-Sn enrichment was derived from the metasedimentary rocks and strongly enhanced by reworking of the continental crust,culminating in the Jurassic.
文摘目的通过网络药理学、分子对接和实验验证探究何首乌-虎杖治疗脑小血管病(cerebral small vessel disease,CSVD)的作用机制。方法运用TCMSP数据库筛选何首乌和虎杖的化学成分及相关靶点蛋白,在GeneCards和OMIM数据库获取痴呆、中风、健忘相关靶点,通过Cytoscape构建中药-活性成分-靶点网络图和蛋白相互作用图,再利用DAVID数据库对作用靶点进行京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路富集。利用Autodock将关键有效成分和重要靶点进行分子对接,评估其结合活性。最后采用β-淀粉样多肽1-42(amyloidβ_(1-42),Aβ_(1-42))诱导BV-2细胞构建阿尔茨海默病(Alzheimer's disease,AD)细胞模型,采用Western blot法研究何首乌-虎杖对AD细胞模型关键靶点表达的影响。结果筛选出24个化学成分,120个活性成分-疾病共有靶点。KEGG结果涉及磷脂酰肌醇3-激酶/蛋白激酶B(phosphatidylinositol 3-kinase and protein kinase B,PI3K-Akt)、丝裂原激活蛋白激酶(mitogen-activated protein kinase,MAPK)、白介素-17(interleukin-17,IL-17)、缺氧诱导因子(hypoxia-inducible factor-1α,HIF-1)、肿瘤坏死因子(tumor necrosis factor,TNF)等多条炎症相关信号通路。筛选出槲皮素、大黄素、β-谷甾醇、大黄素甲醚、芹菜素5个关键化学成分,c-Jun氨基末端激酶(c-Jun N-terminal kinase,JNK)、TNF-α、细胞肿瘤抗原p53(cellular tumor antigen p53,P53)、白介素-6(interleukin-6,IL-6)和表皮生长因子受体(epidermal growth factor receptor,EGFR)5个关键靶点。分子对接结果显示,上述化合物与靶点的结合能均为负值。实验验证结果显示,何首乌-虎杖能显著抑制AD细胞模型5个关键靶点的表达。结论何首乌-虎杖可能通过调节核心靶点JNK、TNF-α、P53、IL-6抑制炎症反应、抑制细胞凋亡,从而发挥治疗CSVD作用。
文摘目的:系统收集中药治疗紧张性头痛(TTH)临床研究的现有证据,评价中药治疗紧张性头痛临床研究的现状。方法:计算机检索国家知识基础设施数据库(CNKI)、中国学术期刊数据库(CSPD)、中文科技期刊数据库(CCD)、中国生物医学文献数据库(CBM)、EMbase、PubMed、Cochrane Library、Web of science、ClinicalTrials.gov和中国临床试验注册中心共10个数据库,检索时限为建库至2020年10月,纳入有关中药治疗TTH的临床研究,采用证据图方法呈现临床研究的证据分布情况。结果:共纳入471项临床研究,其中随机对照试验378项,非随机对照试验41项,队列研究1项,病例系列研究51项,文献总发表数量在总体上随时间变化呈增长趋势,但呈“锯齿状”波动;方法学质量评价结果显示目前中药治疗紧张性头痛的临床研究质量较低;中药治疗紧张性头痛对总有效率、安全性事件、头痛持续时间、头痛强度、头痛发作频率、焦虑抑郁量表关注度较高,对经济学指标及远期预后指标关注较低。疗程集中在15~30 d。结论:目前中药治疗TTH的临床研究质量较低,未来需要开展更多高质量的临床研究为中药治疗TTH提供更充分的证据。
