All eukaryotic cells can secrete extracellular vesicles, which have a double-membrane structure and are important players in the intercellular communication involved in a variety of important biological processes. Pla...All eukaryotic cells can secrete extracellular vesicles, which have a double-membrane structure and are important players in the intercellular communication involved in a variety of important biological processes. Platelets form platelet-derived microparticles (PMPs) in response to activation, injury, or apoptosis. This review introduces the origin, pathway, and biological functions of PMPs and their importance in physiological and pathological processes. In addition, we review the potential applications of PMPs in cancer, vascular homeostasis, thrombosis, inflammation, neural regeneration, biomarkers, and drug carriers to achieve targeted drug delivery. In addition, we comprehensively report on the origin, biological functions, and applications of PMPs. The clinical transformation, high heterogeneity, future development direction, and limitations of the current research on PMPs are also discussed in depth. Evidence has revealed that PMPs play an important role in cell-cell communication, providing clues for the development of PMPs as carriers for relevant cell-targeted drugs. The development history and prospects of PMPs and their cargos are explored in this guidebook.展开更多
Paleogene sedimentary basins exposed across much of the central and eastern Tibetan Plateau may record the early history of plateau uplift related to the Indo\|Asian collision. We conducted sedimentological and strati...Paleogene sedimentary basins exposed across much of the central and eastern Tibetan Plateau may record the early history of plateau uplift related to the Indo\|Asian collision. We conducted sedimentological and stratigraphic investigations in the northeastern Qiangtang terrane, eastern Tibetan Plateau. Our results indicate development of several nonmarine basins during Paleogene(?) time, probably synchronous with northeast\|southwest contractional deformation. The Nangqian and Xialaxiu basins (96°～97°E, 32°～33°N) are composed of 500～ 20000m thick successions of primarily clastic sediment indicative of lacustrine and alluvial\|fan depositional processes. Paleocurrent measurements and sediment compositional data indicate local sediment source areas composed of Carboniferous\|Triassic carbonate and sandstone and minor Tertiary volcanic rocks. The large variability of provenance and facies types suggest that each basin evolved independently, as opposed to regional development of a single integrated basin which was partitioned by later deformation.展开更多
In order to study the role of annexin Ⅱ, a recombinant expression vector, pZeoSV2(+)ANN Ⅱ, containing the annexin Ⅱ cDNA , was developed. The 1.1 kb length annexin Ⅱ cDNA was inserted into a express ion vector,...In order to study the role of annexin Ⅱ, a recombinant expression vector, pZeoSV2(+)ANN Ⅱ, containing the annexin Ⅱ cDNA , was developed. The 1.1 kb length annexin Ⅱ cDNA was inserted into a express ion vector, PZeoSV(+) and transfected into HL 60 cells which had low baseline e xpression of Ann Ⅱ. pZeoSV(+) ANNⅡ was analyzed by restriction mapping and th e Ann Ⅱ sequence identified. The ability of the transfected cells, non transf ected and mock transfected cells to stimulate t PA depend plasminogen activat ion was compared. The results showed that HL 60 with pZeoSV(+)ANNⅡ transfectio n could significantly increase the plasminogen activation (8.9±1.2 U) in vitr o with the difference being significant as compared with non transfected (1.5±0. 4 U) and mock transfected cells (4.2±0.9 U), respectively. AntiannexinⅡoligon ucleotides significantly inhibited the binding ability of t PA and plasminogen to annexinⅡ, and obviously reduced the plasminogen activation in vitro . The above findings showed human umbilical vein endothelial cells (HUVECs) treated w ith sense or missense oligonucleotides indicated no significant change in bindin g of t PA and PLG. Treatment of HUVECs with antiannexin Ⅱ oligonucleotides cou ld significantly reduce the plasminogen activation by 2.4±0.3 U as compared wit h sense oligonucleotide group in binding of t PA and PLG. These results, theref ore, suggest that Ann Ⅱ can bind plasminogen and participate in the stimulatio n of t PA dependent activation of plasminogen, and that interference with Ann Ⅱ mRNA by antisense oligonucleotide may be a new strategy for the therapy of bleeding in patients with hyperfibrinolysis.展开更多
In this paper, the effect of adding different concentrations of kinetic inhibitors on the induction time of hydrogen sulfide hydrate formation in a reactor equipped with automatic adjustable temperature controller is ...In this paper, the effect of adding different concentrations of kinetic inhibitors on the induction time of hydrogen sulfide hydrate formation in a reactor equipped with automatic adjustable temperature controller is studied. A novel method namely ＂sudden cooling＂ is used for performing the relevant measurements, in which the induction time of H2S hydrate in the presence/absence of PVP and L-tyrosine with different concentrations （100, 500, and 1000 ppm） is determined. As a result, PVP with the concentration of 1000 ppm in aqueous solution is detected as a more suitable material for increasing the induction time of H2S hydrate formation among the investigated kinetic hydrate inhibitors.展开更多
目的分析D-二聚体(DD)、纤维蛋白(原)降解产物(FDP)在肝细胞肝癌(hepatocellular carcinoma,HCC)与乙肝肝硬化(hepatitis B cirrhosis,HBC)中表达的差异性,以及DD与FDP阳性表达与不同临床特征HCC的相关性。方法回顾性分析2018年9月—202...目的分析D-二聚体(DD)、纤维蛋白(原)降解产物(FDP)在肝细胞肝癌(hepatocellular carcinoma,HCC)与乙肝肝硬化(hepatitis B cirrhosis,HBC)中表达的差异性,以及DD与FDP阳性表达与不同临床特征HCC的相关性。方法回顾性分析2018年9月—2020年9月包头市肿瘤医院收治的100例HCC患者的临床资料,将其作为研究组;分析同期收治的102例HBC患者的临床资料,将其作为对照组。两组患者均进行DD与FDP检测,比较两组DD与FDP水平与阳性率;不同临床特征[原发肿瘤局部淋巴结远处转移(tumor,nodalinvolvement,metastasis,TNM)分期、病理类型、淋巴结转移情况]的HCC患者DD与FDP阳性表达情况,对DD、FDP阳性表达与不同临床特征进行相关性分析。结果研究组DD与FDP水平均高于对照组,差异有统计学意义(P<0.05)。研究组DD阳性率为52.00%、FDP阳性率为65.00%均高于对照组的24.51%、31.37%,差异有统计学意义(χ^(2)=16.177、22.876,P<0.05)。TNM分期Ⅲ~Ⅳ期HCC患者的DD、FDP阳性表达率高于Ⅰ~Ⅱ期,有淋巴结转移情况的HCC患者的DD、FDP阳性表达率高于无淋巴结转移者,差异有统计学意义(P<0.05);鳞癌与腺癌的DD、FDP阳性表达率对比,差异无统计学意义(P>0.05)。经Spearman相关性分析显示,DD、FDP与HCC患者TNM分期、淋巴结转移均呈正相关性(P<0.05)。结论HCC患者DD、FDP水平可见明显改变,动态监测两种指标可以为疾病诊疗工作提供客观的参考,具有一定的临床应用价值。展开更多
基金supported by the National Science Fund for Distinguished Young Scholars(No:81901099 and 81703427)the 64th batch of China Postdoctoral Science Foundation(No:2018M641731).
文摘All eukaryotic cells can secrete extracellular vesicles, which have a double-membrane structure and are important players in the intercellular communication involved in a variety of important biological processes. Platelets form platelet-derived microparticles (PMPs) in response to activation, injury, or apoptosis. This review introduces the origin, pathway, and biological functions of PMPs and their importance in physiological and pathological processes. In addition, we review the potential applications of PMPs in cancer, vascular homeostasis, thrombosis, inflammation, neural regeneration, biomarkers, and drug carriers to achieve targeted drug delivery. In addition, we comprehensively report on the origin, biological functions, and applications of PMPs. The clinical transformation, high heterogeneity, future development direction, and limitations of the current research on PMPs are also discussed in depth. Evidence has revealed that PMPs play an important role in cell-cell communication, providing clues for the development of PMPs as carriers for relevant cell-targeted drugs. The development history and prospects of PMPs and their cargos are explored in this guidebook.
文摘Paleogene sedimentary basins exposed across much of the central and eastern Tibetan Plateau may record the early history of plateau uplift related to the Indo\|Asian collision. We conducted sedimentological and stratigraphic investigations in the northeastern Qiangtang terrane, eastern Tibetan Plateau. Our results indicate development of several nonmarine basins during Paleogene(?) time, probably synchronous with northeast\|southwest contractional deformation. The Nangqian and Xialaxiu basins (96°～97°E, 32°～33°N) are composed of 500～ 20000m thick successions of primarily clastic sediment indicative of lacustrine and alluvial\|fan depositional processes. Paleocurrent measurements and sediment compositional data indicate local sediment source areas composed of Carboniferous\|Triassic carbonate and sandstone and minor Tertiary volcanic rocks. The large variability of provenance and facies types suggest that each basin evolved independently, as opposed to regional development of a single integrated basin which was partitioned by later deformation.
文摘In order to study the role of annexin Ⅱ, a recombinant expression vector, pZeoSV2(+)ANN Ⅱ, containing the annexin Ⅱ cDNA , was developed. The 1.1 kb length annexin Ⅱ cDNA was inserted into a express ion vector, PZeoSV(+) and transfected into HL 60 cells which had low baseline e xpression of Ann Ⅱ. pZeoSV(+) ANNⅡ was analyzed by restriction mapping and th e Ann Ⅱ sequence identified. The ability of the transfected cells, non transf ected and mock transfected cells to stimulate t PA depend plasminogen activat ion was compared. The results showed that HL 60 with pZeoSV(+)ANNⅡ transfectio n could significantly increase the plasminogen activation (8.9±1.2 U) in vitr o with the difference being significant as compared with non transfected (1.5±0. 4 U) and mock transfected cells (4.2±0.9 U), respectively. AntiannexinⅡoligon ucleotides significantly inhibited the binding ability of t PA and plasminogen to annexinⅡ, and obviously reduced the plasminogen activation in vitro . The above findings showed human umbilical vein endothelial cells (HUVECs) treated w ith sense or missense oligonucleotides indicated no significant change in bindin g of t PA and PLG. Treatment of HUVECs with antiannexin Ⅱ oligonucleotides cou ld significantly reduce the plasminogen activation by 2.4±0.3 U as compared wit h sense oligonucleotide group in binding of t PA and PLG. These results, theref ore, suggest that Ann Ⅱ can bind plasminogen and participate in the stimulatio n of t PA dependent activation of plasminogen, and that interference with Ann Ⅱ mRNA by antisense oligonucleotide may be a new strategy for the therapy of bleeding in patients with hyperfibrinolysis.
文摘In this paper, the effect of adding different concentrations of kinetic inhibitors on the induction time of hydrogen sulfide hydrate formation in a reactor equipped with automatic adjustable temperature controller is studied. A novel method namely ＂sudden cooling＂ is used for performing the relevant measurements, in which the induction time of H2S hydrate in the presence/absence of PVP and L-tyrosine with different concentrations （100, 500, and 1000 ppm） is determined. As a result, PVP with the concentration of 1000 ppm in aqueous solution is detected as a more suitable material for increasing the induction time of H2S hydrate formation among the investigated kinetic hydrate inhibitors.
文摘目的分析D-二聚体(DD)、纤维蛋白(原)降解产物(FDP)在肝细胞肝癌(hepatocellular carcinoma,HCC)与乙肝肝硬化(hepatitis B cirrhosis,HBC)中表达的差异性,以及DD与FDP阳性表达与不同临床特征HCC的相关性。方法回顾性分析2018年9月—2020年9月包头市肿瘤医院收治的100例HCC患者的临床资料,将其作为研究组;分析同期收治的102例HBC患者的临床资料,将其作为对照组。两组患者均进行DD与FDP检测,比较两组DD与FDP水平与阳性率;不同临床特征[原发肿瘤局部淋巴结远处转移(tumor,nodalinvolvement,metastasis,TNM)分期、病理类型、淋巴结转移情况]的HCC患者DD与FDP阳性表达情况,对DD、FDP阳性表达与不同临床特征进行相关性分析。结果研究组DD与FDP水平均高于对照组,差异有统计学意义(P<0.05)。研究组DD阳性率为52.00%、FDP阳性率为65.00%均高于对照组的24.51%、31.37%,差异有统计学意义(χ^(2)=16.177、22.876,P<0.05)。TNM分期Ⅲ~Ⅳ期HCC患者的DD、FDP阳性表达率高于Ⅰ~Ⅱ期,有淋巴结转移情况的HCC患者的DD、FDP阳性表达率高于无淋巴结转移者,差异有统计学意义(P<0.05);鳞癌与腺癌的DD、FDP阳性表达率对比,差异无统计学意义(P>0.05)。经Spearman相关性分析显示,DD、FDP与HCC患者TNM分期、淋巴结转移均呈正相关性(P<0.05)。结论HCC患者DD、FDP水平可见明显改变,动态监测两种指标可以为疾病诊疗工作提供客观的参考,具有一定的临床应用价值。
