在前期发现女贞子(Ligustrum lucidum,LL)提取物抑制丙型肝炎病毒(hepatitis C virus,HCV)复制酶(NS5B)活性的基础上,研究女贞子提取物抑制NS5B活性的化学成分及其作用机制。采用乙酸乙酯萃取和薄层色谱法分离女贞子水提取物,NS5B活性...在前期发现女贞子(Ligustrum lucidum,LL)提取物抑制丙型肝炎病毒(hepatitis C virus,HCV)复制酶(NS5B)活性的基础上,研究女贞子提取物抑制NS5B活性的化学成分及其作用机制。采用乙酸乙酯萃取和薄层色谱法分离女贞子水提取物,NS5B活性抑制实验检测各个分离组分的抑制活性。结果显示,分离组分1和2能够抑制NS5B活性,组分2的抑制能力更强。采用高效液相色谱法(high-performance liquid chromatography,HPLC)及NS5B活性抑制实验分析组分1和2中的活性成分。结果显示,熊果酸和齐墩果酸分别是组分1和2的抗NS5B活性成分,齐墩果酸的抑制能力更强。进一步的抑制机制分析发现,熊果酸和齐墩果酸通过非竞争抑制作用抑制NS5B活性,熊果酸和齐墩果酸的Ki分别约为4.7μg·mL 1(10μmol·kg-1)和2.5μg·mL-1(5.5μmol·kg-1)。本研究发现齐墩果酸和熊果酸通过非竞争抑制作用抑制丙型肝炎病毒复制酶NS5B活性,揭示这两个天然化合物具有潜在的丙型肝炎治疗价值。展开更多
AIM:To study the subtype prevalence and the phylogenetic relatedness of hepatitis C virus(HCV)sequences obtained from the Argentine general population,a large cohort of individuals was analyzed.METHODS:Healthy Argenti...AIM:To study the subtype prevalence and the phylogenetic relatedness of hepatitis C virus(HCV)sequences obtained from the Argentine general population,a large cohort of individuals was analyzed.METHODS:Healthy Argentinian volunteers(n=6251)from 12 provinces representing all geographical regions of the country were studied.All parents or legal guardians of individuals younger than 18 years provided informed written consent for participation.The corresponding written permission from all municipal authorities was obtained from each city or town where subjects were to be included.HCV RNA reverse transcription-polymerase chain reaction products were sequenced and phylogenetically analyzed.The 5’untranslated region(5’UTR)was used for RNA detection and initial genotype classification.The NS5B polymerase region,encompassing nt 8262-8610,was used for subtyping.RESULTS:An unexpectedly low prevalence of HCV infection in the general population(0.32%)was observed.Our data contrasted with previous studies that reported rates ranging from 1.5%to 2.5%,mainly performed in selected populations of blood donors or vulnerable groups.The latter values are in keeping with the prevalence reported by the 2007 Argentinian HCV Consensus(approximately 2%).HCV subtypes weredistributed as follows:1a(25%),1b(25%),2c(25%),3a(5%),and 2j(5%).Two isolates ascribed either to genotype 1(5%)or to genotype 3(5%)by 5’UTR phylogenetic analysis could not be subtyped.Subtype 1a sequences comprised a highly homogeneous population and clustered with United States sequences.Genotype1b sequences represented a heterogeneous population,suggesting that this genotype might have been introduced from different sources.Most subtype 2c sequences clustered close to the 2c reported from Italy and Southern France.CONCLUSION:HCV has a low prevalence of 0.32%in the studied general population of Argentina.The pattern of HCV introduction and transmission in Argentina appears to be a consequence of multiple events and different for each subtype.展开更多
Quantitative structure activity relationship （QSAR） studies were performed on 45 anthranilic acid derivatives for their potent allosteric inhibition activities of HCV NSSB polymerase. Genetic algorithm based genetic...Quantitative structure activity relationship （QSAR） studies were performed on 45 anthranilic acid derivatives for their potent allosteric inhibition activities of HCV NSSB polymerase. Genetic algorithm based genetic function approximation （GFA） method of variable selection was used to generate the model. Highly statistically significant model with r^2 = 0.966 and r^2cv = 0.951 was obtained when the number of descriptors in the equation was set to 5. High r^2pred value of 0.884 indicates the good predictive power of the best model. Spatial descriptors of radius of gyration （RadOfGration）, molecular volume （Vm）, length of molecule in the z dimension （Shadow-Zlength）, thermodynamic descriptors of the octanol/water partition coefficient （LogP） and molecular refractivity index （MR） showed enormous contributions to HCV NS5B polymerase inhibition. The validation of the model was done by leave-one-out （LOO） test, randomization tests and external test set prediction. The model gives insight on indispensable structural requirements for the activity and can be used to design more potent analogs against HCV NSSB polymerase.展开更多
基金Supported by Argentinian Fresenius Medical Care CentreSpanish Ministry of Science and Innovation(MINECO)Grants+2 种基金SAF2009-10403Spanish Ministry of Health(FIS)PI10/01505 and 09/0899
文摘AIM:To study the subtype prevalence and the phylogenetic relatedness of hepatitis C virus(HCV)sequences obtained from the Argentine general population,a large cohort of individuals was analyzed.METHODS:Healthy Argentinian volunteers(n=6251)from 12 provinces representing all geographical regions of the country were studied.All parents or legal guardians of individuals younger than 18 years provided informed written consent for participation.The corresponding written permission from all municipal authorities was obtained from each city or town where subjects were to be included.HCV RNA reverse transcription-polymerase chain reaction products were sequenced and phylogenetically analyzed.The 5’untranslated region(5’UTR)was used for RNA detection and initial genotype classification.The NS5B polymerase region,encompassing nt 8262-8610,was used for subtyping.RESULTS:An unexpectedly low prevalence of HCV infection in the general population(0.32%)was observed.Our data contrasted with previous studies that reported rates ranging from 1.5%to 2.5%,mainly performed in selected populations of blood donors or vulnerable groups.The latter values are in keeping with the prevalence reported by the 2007 Argentinian HCV Consensus(approximately 2%).HCV subtypes weredistributed as follows:1a(25%),1b(25%),2c(25%),3a(5%),and 2j(5%).Two isolates ascribed either to genotype 1(5%)or to genotype 3(5%)by 5’UTR phylogenetic analysis could not be subtyped.Subtype 1a sequences comprised a highly homogeneous population and clustered with United States sequences.Genotype1b sequences represented a heterogeneous population,suggesting that this genotype might have been introduced from different sources.Most subtype 2c sequences clustered close to the 2c reported from Italy and Southern France.CONCLUSION:HCV has a low prevalence of 0.32%in the studied general population of Argentina.The pattern of HCV introduction and transmission in Argentina appears to be a consequence of multiple events and different for each subtype.
基金supported by the National Natural Science Foundation of China (No. 30500339)Natural Science Foundation of Zhejiang Province (NO.Y407308)the Sprout Talented Project Program of Zhejiang Province (No. 2008R40G2020019)
文摘Quantitative structure activity relationship （QSAR） studies were performed on 45 anthranilic acid derivatives for their potent allosteric inhibition activities of HCV NSSB polymerase. Genetic algorithm based genetic function approximation （GFA） method of variable selection was used to generate the model. Highly statistically significant model with r^2 = 0.966 and r^2cv = 0.951 was obtained when the number of descriptors in the equation was set to 5. High r^2pred value of 0.884 indicates the good predictive power of the best model. Spatial descriptors of radius of gyration （RadOfGration）, molecular volume （Vm）, length of molecule in the z dimension （Shadow-Zlength）, thermodynamic descriptors of the octanol/water partition coefficient （LogP） and molecular refractivity index （MR） showed enormous contributions to HCV NS5B polymerase inhibition. The validation of the model was done by leave-one-out （LOO） test, randomization tests and external test set prediction. The model gives insight on indispensable structural requirements for the activity and can be used to design more potent analogs against HCV NSSB polymerase.
