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https://read.qxmd.com/read/30866781/nipah-pseudovirus-system-enables-evaluation-of-vaccines-in-vitro-and-in-vivo-using-non-bsl-4-facilities
#1
Jianhui Nie, Lin Liu, Qing Wang, Ruifeng Chen, Tingting Ning, Qiang Liu, Weijin Huang, Youchun Wang
Because of its high infectivity in humans and the lack of effective vaccines, Nipah virus is classified as a category C agent and handling has to be performed under biosafety level 4 conditions in non-endemic countries, which has hindered the development of vaccines. Based on a highly efficient pseudovirus production system using a modified HIV backbone vector, a pseudovirus-based mouse model has been developed for evaluating the efficacy of Nipah vaccines in biosafety level 2 facilities. For the first time, the correlates of protection have been identified in a mouse model...
2019: Emerging Microbes & Infections
https://read.qxmd.com/read/30807231/detection-of-hepatitis-e-virus-in-raw-pork-and-pig-viscera-as-food-in-hebei-province-of-china
#2
Yansheng Geng, Chenyan Zhao, Tingyu Guo, Ying Xu, Xuanpu Wang, Weijin Huang, Huan Liu, Youchun Wang
Hepatitis E virus (HEV) is an important human pathogen with pigs serving as the main natural animal reservoir. In China, pork is the most popular meat, while pig viscera are also widely consumed. The aim of this study was to evaluate the prevalence of HEV among pigs at slaughter, and assess the presence of HEV in raw pork and pig viscera as food. Samples of pig blood, raw pork, liver, kidney, and blood curd were collected from slaughterhouse or (and) retail market. Anti-HEV antibody in serum samples was detected using enzyme-linked immunosorbent assay based on an ORF2 antigen sandwich kit...
February 26, 2019: Foodborne Pathogens and Disease
https://read.qxmd.com/read/30794997/high-temperature-superconductivity-in-ternary-clathrate-ycah-sub-12-sub-under-high-pressures
#3
Hui Xie, Defang Duan, Ziji Shao, Hao Song, Youchun Wang, Xuehui Xiao, Da Li, Fubo Tian, Bingbing Liu, Tian Cui
Binary hydrogen-rich compounds with H clathrate structures can serve as high-temperature superconductors under high pressures. Here, a novel ternary clathrate structure YCaH<sub>12</sub> with space group <i>Pm</i>-3<i>m</i> is uncovered at high pressure using ab initio methods. It is predicted that YCaH<sub>12</sub> can be stable above 180 GPa and decomposes into YH<sub>6</sub> and CaH<sub>6</sub> above 257 GPa...
February 22, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://read.qxmd.com/read/30723107/rkip-mediates-autoimmune-inflammation-by-positively-regulating-il-17r-signaling
#4
Wenlong Lin, Ning Wang, Kangxing Zhou, Fasheng Su, Yu Jiang, Jianan Shou, Huan Liu, Chunmei Ma, Youchun Qian, Kai Wang, Xiaojian Wang
No abstract text is available yet for this article.
February 2019: EMBO Reports
https://read.qxmd.com/read/30661292/high-seroprevalence-of-hepatitis-e-virus-in-rabbit-slaughterhouse-workers
#5
Yansheng Geng, Chenyan Zhao, Kunjing Geng, Chunyan Wang, Xuanpu Wang, Huan Liu, Youchun Wang
Hepatitis E virus (HEV) was first detected in rabbits in the year 2009. Rabbit HEV is now known to be widely prevalent in rabbits, and tentatively assigned into genotype 3 (HEV-3) as subgenotype-3ra (HEV-3ra). However, its role in human infection remains undetermined. This study was conducted to investigate the prevalence of HEV infection among rabbit slaughterhouse workers and to identify whether the workers exposed to rabbits are at a higher risk of HEV infection. Seventy-five workers at rabbit slaughterhouses and a control group of 421 general adults in the same area in Hebei province, China, were serologically examined for anti-HEV antibodies...
January 19, 2019: Transboundary and Emerging Diseases
https://read.qxmd.com/read/30604797/rapid-and-efficient-isolation-and-detection-of-extracellular-vesicles-from-plasma-for-lung-cancer-diagnosis
#6
Junge Chen, Youchun Xu, Xun Wang, Dongchen Liu, Fan Yang, Xiurui Zhu, Ying Lu, Wanli Xing
Extracellular vesicles (EVs) are cell-derived nanoscale vesicles that provide promising biomarkers for the non-invasive diagnosis of cancer because they carry important cancer-related DNA, RNA and protein biomarkers. However, the clinical application of EVs is limited by tedious and non-standardized isolation methods that require bulky instrumentation. Here, we propose an easy-to-operate, simple dielectrophoretic (DEP) method for EV isolation with higher recovery efficiency (>83%) and higher purity than ultracentrifugation (UC)...
January 3, 2019: Lab on a Chip
https://read.qxmd.com/read/30419475/hepatitis-e-virus-was-not-detected-in-feces-and-milk-of-cows-in-hebei-province-of-china-no-evidence-for-hev-prevalence-in-cows
#7
Yansheng Geng, Chenyan Zhao, Weijin Huang, Xuanpu Wang, Ying Xu, Dongxue Wu, Yueliang Du, Huan Liu, Youchun Wang
Hepatitis E virus (HEV) is an important human pathogen, with pigs and other species serving as natural animal reservoirs. Recently, the report of detection of genotype 4 HEV in dairy milk with high positive rate in Yunnan province of China has attracted extensive attention. To assess the zoonotic risk of cows as HEV reservoir and transmission of HEV through dairy milk, 467 fecal samples of cows, 276 fresh milk samples, and 140 retail milk samples were collected across Hebei Province, China, from March 2017 to May 2018, and detected for HEV RNA...
November 6, 2018: International Journal of Food Microbiology
https://read.qxmd.com/read/30405853/multiplex-cell-free-dna-reference-materials-for-quality-control-of-next-generation-sequencing-based-in-vitro-diagnostic-tests-of-colorectal-cancer-tolerance
#8
Donglai Liu, Xinyuan Zhang, Haiwei Zhou, Xiaojing Lin, Dawei Shi, Shu Shen, Yabin Tian, Bo Du, Henghui Zhang, Haibo Wang, Youchun Wang, Chuntao Zhang
Background: Liquid biopsies based on next-generation sequencing (NGS) assays are confronted with more opportunities and challenges. Widespread clinical implementation of NGS-based cancer in vitro diagnostic tests (IVDs) highlighted the urgency to establish reference materials (RMs) which could provide full control of the process from nucleic acid extraction to test report generation. Quality control based on cell-free DNA (cfDNA) RMs is especially important for liquid biopsies. Methods: Here, we used genomic DNA from thirteen cell lines to establish four negative cfDNA RMs (N1-N4) and four multiplex cfDNA RMs (L1-L4) at serial allelic frequencies ranging from approximately 2% to 0...
2018: Journal of Cancer
https://read.qxmd.com/read/30142928/a-human-dpp4-knockin-mouse-s-susceptibility-to-infection-by-authentic-and-pseudotyped-mers-cov
#9
Changfa Fan, Xi Wu, Qiang Liu, Qianqian Li, Susu Liu, Jianjun Lu, Yanwei Yang, Yuan Cao, Weijin Huang, Chunnan Liang, Tianlei Ying, Shibo Jiang, Youchun Wang
Infection by the Middle East respiratory syndrome coronavirus (MERS-CoV) causes respiratory illness and has a high mortality rate (~35%). The requirement for the virus to be manipulated in a biosafety level three (BSL-3) facility has impeded development of urgently-needed antiviral agents. Here, we established anovel mouse model by inserting human dipeptidyl peptidase 4 (hDPP4) into the Rosa26 locus using CRISPR/Cas9, resulting in global expression of the transgene in a genetically stable mouse line. The mice were highly susceptible to infection by MERS-CoV clinical strain hCoV-EMC, which induced severe diffuse pulmonary disease in the animals, and could also be infected by an optimized pseudotyped MERS-CoV...
August 23, 2018: Viruses
https://read.qxmd.com/read/30109186/synthesis-and-biological-evaluation-of-novel-tricyclic-matrinic-derivatives-as-potential-anti-filovirus-agents
#10
Xin Zhang, Qiang Liu, Qianqian Li, Yinghong Li, Zhandong Liu, Hongbin Deng, Sheng Tang, Yanxiang Wang, Youchun Wang, Danqing Song
Twenty-six novel tricyclic sophoridinic and matrinic derivatives containing a common chlorinated benzene fragment were designed, synthesized and evaluated for their anti-ebolavirus (EBOV) activities. Structure-activity relationship analysis indicated: (i) 12 N -dichlorobenzyl motif was beneficial for the activity; (ii) the chiral configuration at C5 atom might not affect the activity much. Among the target compounds, compound 7d exhibited the most potent potency against EBOV with an IC50 value of 5.29 ╬╝mol/L and an SI value of over 37...
July 2018: Acta Pharmaceutica Sinica. B
https://read.qxmd.com/read/30014076/sensitive-and-rapid-detection-of-pathogenic-bacteria-from-urine-samples-using-multiplex-recombinase-polymerase-amplification
#11
Junge Chen, Youchun Xu, He Yan, Yunzeng Zhu, Lei Wang, Yan Zhang, Ying Lu, Wanli Xing
Bacterial infections may cause severe diseases such as tuberculosis, sepsis, nephritis and cystitis. The rapid and sensitive detection of bacteria is a prerequisite for the treatment of these diseases. The current gold standard for bacterial identification is bacteriological culture. However, culture-based identification takes 3-7 days, which is time-consuming and laborious. In this study, bacteria in urine samples were enriched using a portable filter-based pipette. Then, a centrifugal chip was constructed to detect multiple pathogenic bacteria from urine samples by integrating the DNA extraction, multiplex recombinase polymerase amplification (RPA) and fluorescent detection together...
August 7, 2018: Lab on a Chip
https://read.qxmd.com/read/29982588/antigenic-drift-of-h7n9-viral-hemagglutinin
#12
Tingting Ning, Jianhui Nie, Weijin Huang, Changgui Li, Xuguang Li, Qiang Liu, Hui Zhao, Youchun Wang
Background: Since its emergence in 2013, there have been five H7N9 influenza epidemic waves in China. However, evolution of the hemagglutinin (HA) antigenicity has not been systematically investigated. Methods: To better understand how antigenic drift in HA proteins of H7N9 occurs, 902 H7N9 HA sequences from public database were retrieved and analyzed. 53 mutants with single amino acid substitutions in HA were introduced into pseudoviruses and their antigenic characteristics were analyzed using pseudovirus-based assays...
July 5, 2018: Journal of Infectious Diseases
https://read.qxmd.com/read/29943497/increased-exhausted-cd8-t-cells-with-programmed-death-1-t-cell-immunoglobulin-and-mucin-domain-containing-3-phenotype-in-patients-with-multiple-myeloma
#13
Jiaxiong Tan, Shaohua Chen, Jingying Huang, Youchun Chen, Lijian Yang, Chunli Wang, Jun Zhong, Yuhong Lu, Liang Wang, Kanger Zhu, Yangqiu Li
AIM: The immunosuppressive microenvironment plays a crucial role in T-cell immunodeficiency in multiple myeloma (MM). Overexpression of T-cell immunosuppressive receptors, including programmed death-1 (PD-1) and T-cell immunoglobulin and mucin-domain-containing-3 (Tim-3), may be related to tumor immunosuppression and poor prognosis, and the malignant bone marrow (BM) microenvironment may contribute to such immunosuppression. The purpose of this study was to analyze the distribution of PD-1+ and/or Tim-3+ T cells in different T-cell subset in patients with MM...
June 25, 2018: Asia-Pacific Journal of Clinical Oncology
https://read.qxmd.com/read/29769530/comparison-of-the-genotypic-and-phenotypic-properties-of-hiv-1-standard-subtype-b-and-subtype-b-b-env-molecular-clones-derived-from-infections-in-china
#14
COMPARATIVE STUDY
Hui Xie, Jianhui Nie, Qingqing Chen, Weijin Huang, Youchun Wang
Although a number of standardized human immunodeficiency virus 1 (HIV-1) pseudoviruses have been generated to assess neutralizing antibodies, subtype B/B' has not been comprehensively characterized either genotypically or phenotypically. Full-length env genes were isolated from plasma samples derived from B/B'-infected individuals, including former plasma donors and men who had sex with men. The neutralization properties of these pseudoviruses were determined by testing against sCD4, 16 neutralizing monoclonal antibodies and 44 plasma samples, including samples from those infected with the three major prevalent clades in China...
May 16, 2018: Emerging Microbes & Infections
https://read.qxmd.com/read/29760807/quality-control-of-next-generation-sequencing-based-in-vitro-diagnostic-test-for-onco-relevant-mutations-using-multiplex-reference-materials-in-plasma
#15
Donglai Liu, Haiwei Zhou, Dawei Shi, Shu Shen, Yabin Tian, Lin Wang, Jiatao Lou, Rong Cong, Juan Lu, Henghui Zhang, Meiru Zhao, Shida Zhu, Zhisheng Cao, Ruilin Jin, Yin Wang, Xiaoni Zhang, Guohua Yang, Youchun Wang, Chuntao Zhang
Background: Widespread clinical implementation of next-generation sequencing (NGS)-based cancer in vitro diagnostic tests (IVDs) highlighted the urgency to establish reference materials which could provide full control of the process from nucleic acid extraction to test report generation. The formalin-fixed, paraffin-embedded (FFPE) tissue and blood plasma containing circulating tumor deoxyribonucleic acid (ctDNA) were mostly used for clinically detecting onco-relevant mutations. Methods: We respectively developed multiplex FFPE and plasma reference materials covering three clinically onco-relevant mutations within the epidermal growth factor receptor ( EGFR ) gene at serial allelic frequencies...
2018: Journal of Cancer
https://read.qxmd.com/read/29674348/rkip-mediates-autoimmune-inflammation-by-positively-regulating-il-17r-signaling
#16
Wenlong Lin, Ning Wang, Kangxing Zhou, Fasheng Su, Yu Jiang, Jianan Shou, Huan Liu, Chunmei Ma, Youchun Qian, Kai Wang, Xiaojian Wang
Th17 cells contribute to the development of autoimmune diseases by secreting interleukin-17 (IL-17), which activates its receptor (IL-17R) that is expressed on epithelial cells, macrophages, microglia, and resident neuroectodermal cells. However, the mechanisms through which IL-17R-mediated signaling contributes to the development of autoimmune disease have not been completely elucidated. Here, we demonstrate that Raf-1 kinase inhibitor protein (RKIP) deficiency in mice ameliorates the symptoms of experimental autoimmune encephalomyelitis (EAE)...
June 2018: EMBO Reports
https://read.qxmd.com/read/29218769/current-status-on-the-development-of-pseudoviruses-for-enveloped-viruses
#17
REVIEW
Qianqian Li, Qiang Liu, Weijin Huang, Xuguang Li, Youchun Wang
Emerging and reemerging infectious diseases have a strong negative impact on public health. However, because many of these pathogens must be handled in biosafety level, 3 or 4 containment laboratories, research and development of antivirals or vaccines against these diseases are often impeded. Alternative approaches to address this issue have been vigorously pursued, particularly the use of pseudoviruses in place of wild-type viruses. As pseudoviruses have been deprived of certain gene sequences of the virulent virus, they can be handled in biosafety level 2 laboratories...
January 2018: Reviews in Medical Virology
https://read.qxmd.com/read/29031692/development-and-application-of-a-bioluminescent-imaging-mouse-model-for-chikungunya-virus-based-on-pseudovirus-system
#18
Jiajing Wu, Chenyan Zhao, Qiang Liu, Weijin Huang, Youchun Wang
Chikungunya virus (CHIKV) is an arthropod-borne virus that is transmitted to humans primarily via the bite of an infected mosquito. Infection of humans by CHIKV can cause chikungunya fever which is an acute febrile illness associated with severe, often debilitating polyarthralgias. Since a re-emergence of CHIKV in 2004, the virus has spread into novel locations in nearly 40 countries including non-endemic regions and has led to millions of cases of disease throughout countries. Handling of CHIKV is restricted to the high-containment Biosafety Level 3 (BSL-3) facilities, which greatly impede the research progress of this virus...
November 7, 2017: Vaccine
https://read.qxmd.com/read/28968823/naturally-occurring-single-amino-acid-substitution-in-the-l1-major-capsid-protein-of-human-papillomavirus-type-16-alteration-of-susceptibility-to-antibody-mediated-neutralization
#19
Tingting Ning, Aaron Wolfe, Jianhui Nie, Weijin Huang, Xiaojiang S Chen, Youchun Wang
Background: Each vaccine for human papillomavirus type 16 (HPV16) has been developed on the basis of a single variant, and whether these vaccines can prevent infection due to naturally occurring variants was not clear. Methods: To examine this question, constructs of 39 naturally occurring single amino acid substitutions in L1 were generated for pseudovirion production, based on the analysis of 1204 HPV16 L1 protein sequences from the National Center for Biotechnology Information and Papilloma Virus Episteme...
October 17, 2017: Journal of Infectious Diseases
https://read.qxmd.com/read/28933644/development-and-optimization-of-a-sensitive-pseudovirus-based-assay-for-hiv-1-neutralizing-antibodies-detection-using-a3r5-cells
#20
Qingqing Chen, Jianhui Nie, Weijin Huang, Yanmei Jiao, Lan Li, Tong Zhang, Juan Zhao, Hao Wu, Youchun Wang
Sensitive assays for HIV-1 neutralizing antibody detection are urgently needed for vaccine immunogen optimization and identification of protective immune response levels. In this study, we developed an easy-to-use HIV-1 pseudovirus neutralization assay based on a human CD4+ lymphoblastoid cell line A3R5 by employing a high efficient pseudovirus production system. Optimal conditions for cell counts, infection time, virus dose and concentration of DEAE-dextran were tested and identified. For T-cell line-adapted tier 1 virus strains, significantly higher inhibitory efficiency was observed for both monoclonal neutralizing antibody (4 fold) and plasma (2 fold) samples in A3R5 than those in TZM-bl assay...
January 2, 2018: Human Vaccines & Immunotherapeutics
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