We investigated the occurrence and distribution of terrestrial-derived hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers(OH-GDGTs) in the Han River system and their potential impact on the application of t...We investigated the occurrence and distribution of terrestrial-derived hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers(OH-GDGTs) in the Han River system and their potential impact on the application of the ring index of OH-GDGTs(RI-OH) as a sea surface temperature(SST) proxy in the eastern Yellow Sea. Thereby, we analyzed various samples collected along the Han River and from its surrounding areas(South Korea, n = 34). The OHGDGTs were found in all samples investigated. OH-GDGT-0 was the dominant OH-GDGT component in the estuary and marine samples while OH-GDGT-2 was generally dominant in the soils, the lake sediments and the river suspended particulate matter(SPM). Our results thus suggests a possible warm bias of the RI-OH-derived summer SSTs in the coastal zone to which a large amount of terrestrial organic matter is being supplied. Further studies are necessary to better assess the applicability of the RI-OH proxy in the eastern Yellow Sea.展开更多
The chemoselective C-and O-prenylation of cyclic 1,3-diketones was achieved by tuning the prenyl source and catalyst.In the presence of the solid acid Nafion,the coupling of 1,3-cyclohexanediones with isoprene gave C-...The chemoselective C-and O-prenylation of cyclic 1,3-diketones was achieved by tuning the prenyl source and catalyst.In the presence of the solid acid Nafion,the coupling of 1,3-cyclohexanediones with isoprene gave C-prenylated 5-chromenones.Alternatively,using prenol as the substrate with the Lewis acid Al Cl3 as the catalyst resulted in the exclusive O-prenylation of 1,3-cyclohexanediones.Notably,the resulting products could easily undergo aromatization to deliver prenylated resorcinols that are otherwise difficult to prepare.Our methodology is highly selective,atom-economical,operationally simple,easily scalable,and has potential applications throughout organic synthesis.展开更多
目的探讨异戊二烯基二磷酸合酶第二亚基(PDSS2)在肝细胞癌组织及肝癌细胞株中的表达水平变化及对肝癌细胞增殖、凋亡、迁移和侵袭的影响。方法采用定量RT-PCR检测肝细胞癌组织、癌旁非癌肝组织、正常肝组织以及肝癌细胞株、正常肝细胞株...目的探讨异戊二烯基二磷酸合酶第二亚基(PDSS2)在肝细胞癌组织及肝癌细胞株中的表达水平变化及对肝癌细胞增殖、凋亡、迁移和侵袭的影响。方法采用定量RT-PCR检测肝细胞癌组织、癌旁非癌肝组织、正常肝组织以及肝癌细胞株、正常肝细胞株PDSS2 m RNA表达水平,并分析肝细胞癌组织PDSS2 m RNA表达水平与患者临床病理特征的关系。将PDSS2表达质粒、阴性对照质粒分别转染Huh7肝癌细胞(另设空白对照,即未处理的Huh7细胞),并用MTT法检测Huh7肝癌细胞增殖能力变化,流式细胞术检测凋亡变化,Transwell法检测迁移及侵袭能力变化。结果肝细胞癌组织PDSS2 m RNA表达水平明显低于配对的癌旁非癌肝组织及正常成人肝组织,配对的癌旁非癌肝组织PDSS2 m RNA的表达水平也明显低于正常成人肝组织(P<0.05);Huh7、Hep3B和Bel-7402肝癌细胞PDSS2 m RNA表达水平均明显低于HL-7702正常肝细胞。与高表达PDSS2 m RNA者比较,低表达PDSS2m RNA的肝癌患者中其癌组织分化程度较差者(Edmondson gradeⅢ-Ⅳ)比例及存在门静脉癌栓者比例均较高;而肝细胞癌组织PDSS2 m RNA表达水平与其他临床病理参数之间,包括年龄、性别、肿瘤大小、甲胎蛋白水平均无明显相关性。与空白及阴性对照组比较,转染pc DNA3.1-PDSS2质粒的Huh7肝癌细胞增殖活性明显降低,细胞凋亡显著增加,细胞迁移和侵袭能力明显受到抑制。结论 PDSS2其表达下调参与肝细胞癌的发生发展,并且与肝细胞癌的恶性生物学特征相关;上调PDSS2表达可以抑制肝癌细胞生长和侵袭能力,PDSS2可能成为潜在的基因治疗靶点。展开更多
8,2＇-Diprenylquercetin 3-methyl ether with significant anti-breast cancer activity is the main constituent of Tibetan medicine Sinopodophylli Fructus. In the present study, we developed and validated a rapid and sens...8,2＇-Diprenylquercetin 3-methyl ether with significant anti-breast cancer activity is the main constituent of Tibetan medicine Sinopodophylli Fructus. In the present study, we developed and validated a rapid and sensitive ultra performance liquid chromatography-tandem mass spectrometry （UPLC-MS/MS） method for the determination of 8,2＇-diprenylquercetin 3-methyl ether in rat plasma. 8-Prenylkaempferol was used as the internal standard. The separation was carried out using Waters ACQUITY UPLC BEH C18 column （2.1 mm×100 ram, 1.7 μm） with a mobile phase consisting of acetonitrile and 0.1% formic acid in water on a gradient program at a flow rate of 0.4 mL＇min-1 and temperature of 30 ℃. Triple quadrupole mass spectrometric detection in negative ion mode was used for multiple-reaction monitoring of the transitions at m/z 451.30→177.25 and m/z 353.25→298.15 for 8,2＇-diprenylquercetin 3-methyl ether and 8-prenylkaempferol, respectively. The calibration curves were linear within the concentration range 0.1-2000 ng/mL （r = 0.9954）. The recoveries were 103%-115%, and the results were consistent across low, middle and high concentration levels. The intra- and inter-day precisions were within 15%, and the bias was between --6%-15%. This method was simple, rapid and sensitive, which could be applied to the determination of 8,2＇-diprenylquercetin 3-methyl ether in plasma and pharmacokinetic study in rats. Pharmacokinetic test indicated that the peak plasma concentration occurred in 2 h after the female rats were intragastrically administered with 8,2＇-diprenylquercetin 3-methyl ether at the dose of 100 mg/kg, and the biological half-life was 6.79 h. The blood drug concentration maintained equal amount for 20 h, which was conducive to the in vivo effects of drugs.展开更多
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIP)(No.NRF-2016R1A2B3015388)
文摘We investigated the occurrence and distribution of terrestrial-derived hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers(OH-GDGTs) in the Han River system and their potential impact on the application of the ring index of OH-GDGTs(RI-OH) as a sea surface temperature(SST) proxy in the eastern Yellow Sea. Thereby, we analyzed various samples collected along the Han River and from its surrounding areas(South Korea, n = 34). The OHGDGTs were found in all samples investigated. OH-GDGT-0 was the dominant OH-GDGT component in the estuary and marine samples while OH-GDGT-2 was generally dominant in the soils, the lake sediments and the river suspended particulate matter(SPM). Our results thus suggests a possible warm bias of the RI-OH-derived summer SSTs in the coastal zone to which a large amount of terrestrial organic matter is being supplied. Further studies are necessary to better assess the applicability of the RI-OH proxy in the eastern Yellow Sea.
文摘The chemoselective C-and O-prenylation of cyclic 1,3-diketones was achieved by tuning the prenyl source and catalyst.In the presence of the solid acid Nafion,the coupling of 1,3-cyclohexanediones with isoprene gave C-prenylated 5-chromenones.Alternatively,using prenol as the substrate with the Lewis acid Al Cl3 as the catalyst resulted in the exclusive O-prenylation of 1,3-cyclohexanediones.Notably,the resulting products could easily undergo aromatization to deliver prenylated resorcinols that are otherwise difficult to prepare.Our methodology is highly selective,atom-economical,operationally simple,easily scalable,and has potential applications throughout organic synthesis.
文摘目的探讨异戊二烯基二磷酸合酶第二亚基(PDSS2)在肝细胞癌组织及肝癌细胞株中的表达水平变化及对肝癌细胞增殖、凋亡、迁移和侵袭的影响。方法采用定量RT-PCR检测肝细胞癌组织、癌旁非癌肝组织、正常肝组织以及肝癌细胞株、正常肝细胞株PDSS2 m RNA表达水平,并分析肝细胞癌组织PDSS2 m RNA表达水平与患者临床病理特征的关系。将PDSS2表达质粒、阴性对照质粒分别转染Huh7肝癌细胞(另设空白对照,即未处理的Huh7细胞),并用MTT法检测Huh7肝癌细胞增殖能力变化,流式细胞术检测凋亡变化,Transwell法检测迁移及侵袭能力变化。结果肝细胞癌组织PDSS2 m RNA表达水平明显低于配对的癌旁非癌肝组织及正常成人肝组织,配对的癌旁非癌肝组织PDSS2 m RNA的表达水平也明显低于正常成人肝组织(P<0.05);Huh7、Hep3B和Bel-7402肝癌细胞PDSS2 m RNA表达水平均明显低于HL-7702正常肝细胞。与高表达PDSS2 m RNA者比较,低表达PDSS2m RNA的肝癌患者中其癌组织分化程度较差者(Edmondson gradeⅢ-Ⅳ)比例及存在门静脉癌栓者比例均较高;而肝细胞癌组织PDSS2 m RNA表达水平与其他临床病理参数之间,包括年龄、性别、肿瘤大小、甲胎蛋白水平均无明显相关性。与空白及阴性对照组比较,转染pc DNA3.1-PDSS2质粒的Huh7肝癌细胞增殖活性明显降低,细胞凋亡显著增加,细胞迁移和侵袭能力明显受到抑制。结论 PDSS2其表达下调参与肝细胞癌的发生发展,并且与肝细胞癌的恶性生物学特征相关;上调PDSS2表达可以抑制肝癌细胞生长和侵袭能力,PDSS2可能成为潜在的基因治疗靶点。
基金National Natural Science Foundation of China(Grant No.81673590)National Key Technology R&D Program "New Drug Innovation" of China(Grant No.2013ZX09103002-006)
文摘8,2＇-Diprenylquercetin 3-methyl ether with significant anti-breast cancer activity is the main constituent of Tibetan medicine Sinopodophylli Fructus. In the present study, we developed and validated a rapid and sensitive ultra performance liquid chromatography-tandem mass spectrometry （UPLC-MS/MS） method for the determination of 8,2＇-diprenylquercetin 3-methyl ether in rat plasma. 8-Prenylkaempferol was used as the internal standard. The separation was carried out using Waters ACQUITY UPLC BEH C18 column （2.1 mm×100 ram, 1.7 μm） with a mobile phase consisting of acetonitrile and 0.1% formic acid in water on a gradient program at a flow rate of 0.4 mL＇min-1 and temperature of 30 ℃. Triple quadrupole mass spectrometric detection in negative ion mode was used for multiple-reaction monitoring of the transitions at m/z 451.30→177.25 and m/z 353.25→298.15 for 8,2＇-diprenylquercetin 3-methyl ether and 8-prenylkaempferol, respectively. The calibration curves were linear within the concentration range 0.1-2000 ng/mL （r = 0.9954）. The recoveries were 103%-115%, and the results were consistent across low, middle and high concentration levels. The intra- and inter-day precisions were within 15%, and the bias was between --6%-15%. This method was simple, rapid and sensitive, which could be applied to the determination of 8,2＇-diprenylquercetin 3-methyl ether in plasma and pharmacokinetic study in rats. Pharmacokinetic test indicated that the peak plasma concentration occurred in 2 h after the female rats were intragastrically administered with 8,2＇-diprenylquercetin 3-methyl ether at the dose of 100 mg/kg, and the biological half-life was 6.79 h. The blood drug concentration maintained equal amount for 20 h, which was conducive to the in vivo effects of drugs.
