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Guo HQ, Li XY, Chen SM, Zhang W, Bao CM, Yin Z, Li BA. [Emerging and comparative genomic analysis of a novel plasmid carrying blaKPC-2 in Citrobacter freundii]. Zhonghua Yu Fang Yi Xue Za Zhi 2023; 57:2122-2128. [PMID: 38186165 DOI: 10.3760/cma.j.cn112150-20230530-00419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Objective: To explore the drug resistance mechanism and gene structure characteristics of a carbapenemase-producing novel incompatibility group plasmid pNY2385-KPC from Citrobacter freundii. Methods: A multi-drug resistant strain was obtained from urine samples of patients with fever in the emergency ward of Li Huili Hospital, Ningbo Medical Center. Bacterial species was preliminary identified and finally confirmed by 16S rRNA gene amplification and the average nucleotide identity alignment, respectively. The minimum inhibitory concentrations of the antimicrobial agents were determined by VITEK 2 Compact System. The complete genome sequence was obtained by "third-generation" sequencing methods, and then detailed annotation of gene function and comparative genomic analysis of plasmid structure were carried out by BLASTP/BLASTN, RefSeq, ConservedDomains, ResFinder, Isfinder, etc. Results: The pNY2385-KPC carried by citrobacter freundii NY2385 belonged a novel incompatibility group, and contained blaKPC-2 and conjugative transfer (type Ⅳ secretory system, T4SS) genes, which could induce conjugative transfer. A total of 15 plasmids of the same type as pNY2385-KPC were retrieved by NCBI, which were from Citrobacter freundii, and the rest were from Serratia marcescens, Escherichia coli, Enterobacter cloacae, Klebsiella pneumoniae, Raoultella planticola and other bacteria, and were broad-host-range plasmids. The sequence comparative analysis of all 6 of the novel plasmid from Citrobacter freundii showed that the structure of the novel plasmid had certain conserved property, with Tn6296 variant structure carrying blaKPC-2, and plasmid pCF1807-3 had both repApNY2385-KPC and repAIncX8. Conclusion: The pNY2385-KPC type plasmids in Citrobacter freundii carried blaKPC-2 resistance gene, which were divided into two subtypes: repApNY2385-KPC single replicator and repApNY2385-KPC/repAIncX8 complex replicator, belonging to broad-host-range plasmids. And as a mobile genetic element, the plasmids promote the spread of blaKPC-2.
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Affiliation(s)
- H Q Guo
- School of Medical Laboratory, Weifang Medical University, Weifang 261053, China State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100071, China Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - X Y Li
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100071, China
| | - S M Chen
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - W Zhang
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - C M Bao
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - Z Yin
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100071, China
| | - B A Li
- School of Medical Laboratory, Weifang Medical University, Weifang 261053, China Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
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Bian CR, Li JJ, Song YW, Song LJ, Zhao J, Dong RM, Zhang L, Gao Y, Li JY, Yuan WW, Zhao LL, Xu TT, Men SQ, Li BA. [Analysis of characteristics of drug resistance gene mutation in HBV RT region of hepatitis B infected patients]. Zhonghua Yu Fang Yi Xue Za Zhi 2023; 57:868-876. [PMID: 37357206 DOI: 10.3760/cma.j.cn112150-20220615-00613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/27/2023]
Abstract
Objective: This article investigated the clinical characteristics and distribution of drug resistance mutation sites in HBV RT region of hepatitis B infected patients. Methods: Retrospective analysis was made on 1 948 patients with HBV infection, who had been tested for NAs resistance mutation and had a medical history of NAs in the Laboratory Department of the Fifth Medical Center of the PLA General Hospital from January 2020 to December 2021. Basic clinical information and drug resistance related mutation information were recorded. Meanwhile, the serological index data of hepatitis B were collected. Drug resistance gene mutant group and non-mutated group were grouped according to whether the drug resistance genes had a mutation in HBV RT region, and the clinical characteristics and genotype distribution of the two groups were statistically analyzed. The pattern of drug resistance gene mutation, number of mutation sites, drug resistance type and mutation of NAs resistance-related sites were analyzed in 917 patients with drug resistance gene mutation in HBV RT region. χ2 Inspection was used for counting data. Meanwhile, two independent samples t-test and Wilcoxon rank sum test were used for measurement data. Results: Among the 1 948 patients with chronic HBV infection, 917 patients had drug resistance gene mutation in RT region (47.07%). The proportion of patients with acute hepatitis B and CHB in HBV RT resistance gene mutant group was lower than that in the non-mutated group, while the proportion of patients with HBV-related cirrhosis was higher than that in the non-mutated group, these differences were statistically significant. Compared with the non-mutated group in HBV RT region, the age, the positive rates of HBeAg and HBV DNA, and HBV DNA load of these patients were increased in drug resistance gene mutant group, these differences were statistically significant. Genotypes of patients in both groups were dominated by C, followed by B and D. The proportion of patients with genotype C in HBV RT drug resistance gene mutant group was higher than that of non-mutated group, the difference was statistically significant. There were 53 gene mutation patterns in 917 patients with drug resistance gene mutation in HBV RT region, and the main pattern was rtL180M+rtM204V+rtS202G (9.70%). The mutation sites were dominated by 3 (20.74%). There were 5 types of drug resistance, LAM+Ldt (21.25%) was the most. Among the 18 sites that were clearly associated with LAM, ADV, ETV and Ldt resistance in the HBV RT region, 14 sites were mutated, and the most common mutation sites were rtL180M, rtM204V, rtM204 and rtS202G. what's more, the proportion of patients with NAs drug resistance was LAM>Ldt>ETV>ADV. Conclusion: In order to prevent adverse consequences of this study such as disease recurrence or disease progression caused by HBV drug resistance, HBV infected patients, who have long-term use of NAs antiviral therapy, should monitor the level of HBV DNA and drug resistance genes in HBV RT region in order to optimize the treatment plan in time or guide individualized treatment.
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Affiliation(s)
- C R Bian
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China
| | - J J Li
- Department of Medical Laboratory, Hebei North University, Zhangjiakou 075000, China
| | - Y W Song
- Department of Blood Transfusion Medicine, the First Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - L J Song
- Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - J Zhao
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China
| | - R M Dong
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China
| | - L Zhang
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China
| | - Y Gao
- Department of Medical Laboratory, Hebei North University, Zhangjiakou 075000, China
| | - J Y Li
- Department of Medical Laboratory, Dalian Medical University, Dalian 116041, China
| | - W W Yuan
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China
| | - L L Zhao
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China
| | - T T Xu
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China
| | - S Q Men
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China
| | - B A Li
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100039, China School of Medical Laboratory, Weifang Medical University, Weifang 261053, China Department of Laboratory Medicine, School of Medical Technology and Engineering, Fujian Medical University, Fuzhou 350122, China
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Li X, Zhang W, Chen SM, Jia TY, Wang H, Cui EB, Bao CM, Li BA. [Risk factors of carbapenem resistant Acinetobacter baumannii infection in intensive care unit]. Zhonghua Yu Fang Yi Xue Za Zhi 2021; 55:1419-1425. [PMID: 34963238 DOI: 10.3760/cma.j.cn112150-20210915-00895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Objective: This study will analyze the clinical characteristics and risk factors that may be related to the 30-day mortality of patients infected with CRAB in intensive care unit (ICU), and explore the resistance of CRAB and its influence on mortality. Methods: From December 2012 to February 2021, 173 ICU patients with CRAB infection in the Fifth Medical Center of PLA General Hospital were selected as the research objects, and the relevant data were collected for retrospective analysis. There were 119 cases (68.8%) in survival group and 54 cases (31.2%) in the non-survival group. Patients with CRAB infection were (52.9±13.5) years old, including 140 males (80.9%) and 33 females (19.1%).The first detected CRAB was collected, and antibiotic sensitivity test was conducted after the strain was resuscitated to analyze the antibiotic resistance. Univariate and multivariate Cox models were used to analyze independent risk factors associated with 30-day mortality in patients with CRAB infection. Results: Univariate and multivariate Cox analysis showed that acute physiology and chronic health evaluation scoring system Ⅱ(APACHE Ⅱ)(HR=1.058, 95%CI:1.012-1.106, P=0.013) and septic shock (HR=6.240, 95%CI:2.227-17.483, P<0.001) were independent risk factors related to 30-day mortality in ICU patients with CRAB. Treatment with β-lactamase inhibitor (HR=0.496, 95%CI: 0.275-0.893, P<0.019) can reduce the 30-day mortality of patients with CRAB infection in ICU. The resistance rate of CRAB to cephalosporins, carbapenems, aminoglycosides and quinolones were more than 80%. The survival rate of patients infected by aminoglycoside resistant CRAB is low(χ²=4.012,P<0.05). Conclusion: The APACHE Ⅱ score, septic shock and use of β-lactamase inhibitors were independent factors associated with the 30-day mortality in ICU patients with CRAB infection.
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Affiliation(s)
- X Li
- School of Medical Laboratory, Weifang Medical University, Weifang 261053,China
| | - W Zhang
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - S M Chen
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - T Y Jia
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - H Wang
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - E B Cui
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - C M Bao
- Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
| | - B A Li
- School of Medical Laboratory, Weifang Medical University, Weifang 261053,China Department of Clinical Laboratory, the Fifth Medical Centre of PLA General Hospital, Beijing 100039, China
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Jing XK, Jiang QY, Li CS, Zhang NR, Chai YT, Feng F, Li BA, Li YK. [Methylation detection of phosphatase and tensin homolog deleted on chromosome ten gene promoter in hepatocellular carcinoma samples by next-generation sequencing]. Zhonghua Yu Fang Yi Xue Za Zhi 2021; 55:1220-1227. [PMID: 34706508 DOI: 10.3760/cma.j.cn112150-20210302-00208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: The purpose of this study is to use the next-generation sequencing (NGS) technology platform to detect the methylation rate of phosphatase and tensin homolog deleted on chromosome ten (PTEN) promoter region in hepatocellular carcinoma (HCC) tissue samples, and to analyze the clinical significance of its correlation with the prognosis of patients receiving sorafenib treatment. Methods: The 52 pairs of tumor tissue and para-cancerous tissue samples from HCC patients treated with sorafenib alone, which were collected and preserved in the Liver Tumor Diagnosis and Research Center of the former 302 Hospital of the People's Liberation Army by the National Natural Science Foundation of China Youth Project with the project batch number 81702986 in 2018, were extracted total DNA from the samples. Then the DNA samples were treated with bisulfite and specific primers were designed to amplify the PTEN promoter region. Finally, the amplified products were analyzed by second-generation sequencing. In the analysis of clinical significance of PTEN methylation, log-rank statistical analysis was used to calculate whether there was a statistical difference in survival between the patient groups. Results: The methylation rate of PTEN promoter region in tumor tissues (29.17%±9.58%) was significantly higher than that in paracancer tissues (4.17%±2.86%)(t=19.970,P<0.05). At the same time, in HCC tissues, the methylation rate of the PTEN promoter region is negatively correlated with its expression (F=47.270,P<0.000 1;Y=-1 800×X+38.03), and the PTEN methylation rate is negatively correlated with the prognosis of patients receiving the molecularly targeted drug Sorafenib (χ²=4.313,P<0.05). Conclusion: This study successfully established a new method for detecting methylation in the promoter region of PTEN, and the methylation rate of PTEN can be used as one of the targets of HCC diagnosis and targeted therapy.
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Affiliation(s)
- X K Jing
- School of Pharmacy, Hubei University of Science and Technology, Xianning 437100,China
| | - Q Y Jiang
- Institute of Infectious Disease, Department of Infectious Disease, the Fifth Medical Center, General Hospital of Chinese People's Liberation Army, Beijing 100039,China
| | - C S Li
- Institute of Infectious Disease, Department of Infectious Disease, the Fifth Medical Center, General Hospital of Chinese People's Liberation Army, Beijing 100039,China
| | - N R Zhang
- School of Pharmacy, Hubei University of Science and Technology, Xianning 437100,China
| | - Y T Chai
- Institute of Infectious Disease, Department of Infectious Disease, the Fifth Medical Center, General Hospital of Chinese People's Liberation Army, Beijing 100039,China
| | - F Feng
- The Clinical Laboratory Medicine Center, the Fifth Medical Center, General Hospital of Chinese People's Liberation Army, Beijing 100039,China
| | - B A Li
- The Clinical Laboratory Medicine Center, the Fifth Medical Center, General Hospital of Chinese People's Liberation Army, Beijing 100039,China
| | - Y K Li
- School of Pharmacy, Hubei University of Science and Technology, Xianning 437100,China
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Zhang YJ, Li BA, Li ZY, Xia N, Yu HY, Zhang YZ. Synthesis and characterization of Tamoxifen citrate modified reduced graphene oxide nano sheets for breast cancer therapy. J Photochem Photobiol B 2017; 180:68-71. [PMID: 29413703 DOI: 10.1016/j.jphotobiol.2017.12.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Revised: 12/14/2017] [Accepted: 12/15/2017] [Indexed: 10/18/2022]
Abstract
Theranostic agents are of immense consideration in the current generation nanomedicine. In this study, we have developed a facile approach for the fabrication of Tamoxifen citrate modified nanosized reduced graphene oxide (nano-rGO) with more stability and low cytotoxicity. The prepared nano-rGO sheets were characterized using HR-TEM and AFM imaging techniques. Further, the cytotoxicity was assessed using MTT assay on female BALB/c nude mice MCF-7 cell lines. In addition, by means of continuous-wave near-infrared laser, cancer cells in vivo were significantly ablated because of the photothermal effect stimulated by tamoxifen modified nano-rGO. These results indicated that the prepared tamoxifen modified nano-rGO has the ability to apply in the photothermal therapy of breast cancers. Consequently, further exploration of photothermal therapeutics is desirable for the synthesis of novel nano materials with additional functionalities.
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Affiliation(s)
- Yu-Jin Zhang
- Medical College of Nanchang University, Clinical undergraduate Queen Mary, University of London, United Kingdom
| | - Bao-An Li
- Medicine of Xiangyang Vocational and Technical College, Xiangyang, PR China
| | - Zhao-Yuan Li
- Department of Oncology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, PR China
| | - Ning Xia
- Department of Pharmacy, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, PR China
| | - Hai-Ying Yu
- Department of Oncology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, PR China
| | - Ya-Zhi Zhang
- Department of Pharmacy, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, PR China.
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He XT, Fattoyev FJ, Li BA, Newton WG. Shedding Light on the EOS-Gravity Degeneracy and Constraining the Nuclear Symmetry Energy from the Gravitational Binding Energy of Neutron Stars. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201610907002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tian HL, Zhao JY, Zhang HY, Chi CQ, Li BA, Wu XL. Bacterial community shift along with the changes in operational conditions in a membrane-aerated biofilm reactor. Appl Microbiol Biotechnol 2014; 99:3279-90. [DOI: 10.1007/s00253-014-6204-7] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 10/28/2014] [Accepted: 10/30/2014] [Indexed: 10/24/2022]
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Wen DH, Li BA, Chen LW. Supersoft symmetry energy encountering non-Newtonian gravity in neutron stars. Phys Rev Lett 2009; 103:211102. [PMID: 20366025 DOI: 10.1103/physrevlett.103.211102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2009] [Indexed: 05/29/2023]
Abstract
Considering the non-Newtonian gravity proposed in grand unification theories, we show that the stability and observed global properties of neutron stars cannot rule out the supersoft nuclear symmetry energies at suprasaturation densities. The degree of possible violation of the inverse-square law of gravity in neutron stars is estimated using an equation of state of neutron-rich nuclear matter consistent with the available terrestrial laboratory data.
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Affiliation(s)
- De-Hua Wen
- Department of Physics, South China University of Technology, Guangzhou 510641, P.R. China
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Xiao Z, Li BA, Chen LW, Yong GC, Zhang M. Circumstantial evidence for a soft nuclear symmetry energy at suprasaturation densities. Phys Rev Lett 2009; 102:062502. [PMID: 19257581 DOI: 10.1103/physrevlett.102.062502] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2008] [Revised: 12/01/2008] [Indexed: 05/27/2023]
Abstract
Within an isospin- and momentum-dependent hadronic transport model, it is shown that the recent FOPI data on the pi;{-}/pi;{+} ratio in central heavy-ion collisions at SIS/GSI energies [Willy Reisdorf, Nucl. Phys. A 781, 459 (2007)10.1016/j.nuclphysa.2006.10.085] provide circumstantial evidence suggesting a rather soft nuclear symmetry energy E_{sym}(rho) at rho> or =2rho_{0} compared to the Akmal-Pandharipande-Ravenhall prediction. Some astrophysical implications and the need for further experimental confirmations are discussed.
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Affiliation(s)
- Zhigang Xiao
- Department of Physics, Tsinghua University, Beijing 100084, PR China
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Mao YL, Li BA, Ma HB, Sun ZQ, Shi JB, Li XH, Xu J, Wang XF, Yang LH. [Significance of hepatitis B virus PreS1-Ag, PreS2-Ag, large protein, PreS2-Ab detection and the prediction of HBV DNA replication.]. Zhonghua Shi Yan He Lin Chuang Bing Du Xue Za Zhi 2006; 20:276-8. [PMID: 17086293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
BACKGROUND To explore the significance of hepatitis B virus PreS1-Ag, PreS2-Ag, large protein (LP) detection and the prediction of viral replication. METHODS PreS1-Ag, PreS2-Ag, LP and HBV markers were measured by enzyme linked immunosorbent assay (ELISA) in 201 cases of infected serum. Serum HBV DNA level was quantitatively detected by real-time polymerase chain reaction (PCR). RESULTS There were significant differences in positive rate between the PreS1-Ag, PreS2-Ag, LP, and HBsAg; the positive rate of PreS2-Ag and LP were higher than that of the HBeAg. No significant differences were found in the positive rates between LP and the levels of HBV DNA and there was a positive correlation between quantitations of HBV DNA and HBV-LP. CONCLUSION Serum PreS1-Ag, PreS2-Ag and LP were laboratory markers that can accurately reflect HBV DNA reproduction, and were helpful complementarity to traditional HBV M. There is a close correlation between the number of copies of HBV DNA and the levels of HBV-LP.
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Affiliation(s)
- Y L Mao
- Center of Clinical Laboratory, The No. 302 Hospital of The People's Liberation Army, Beijing 100039, China
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Chen LW, Ko CM, Li BA. Determination of the stiffness of the nuclear symmetry energy from isospin diffusion. Phys Rev Lett 2005; 94:032701. [PMID: 15698257 DOI: 10.1103/physrevlett.94.032701] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2004] [Indexed: 05/24/2023]
Abstract
With an isospin- and momentum-dependent transport model, we find that the degree of isospin diffusion in heavy-ion collisions at intermediate energies is affected by both the stiffness of the nuclear symmetry energy and the momentum dependence of the nucleon potential. Using a momentum dependence derived from the Gogny effective interaction, recent experimental data from NSCL-MSU on isospin diffusion are shown to be consistent with a nuclear symmetry energy given by E(sym)(rho) approximately 31.6(rho/rho(0))(1.05) at subnormal densities. This leads to a significantly constrained value of about -550 MeV for the isospin-dependent part of the isobaric incompressibility of isospin asymmetric nuclear matter.
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Affiliation(s)
- Lie-Wen Chen
- Cyclotron Institute and Physics Department, Texas A&M University, College Station, Texas 77843-3366, USA
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Yan HX, Wang HY, Zhang R, Chen L, Li BA, Liu SQ, Cao HF, Qiu XH, Shan YF, Yan ZH, Wu HP, Tan YX, Wu MC. Negative regulation of hepatocellular carcinoma cell growth by signal regulatory protein alpha1. Hepatology 2004; 40:618-28. [PMID: 15349900 DOI: 10.1002/hep.20360] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Signal regulatory protein (SIRP) alpha1 is a member of the SIRP family that undergoes tyrosine phosphorylation and binds SHP-2 tyrosine phosphatase in response to various mitogens. The expression levels of SIRPalpha1 were decreased in HCC tissues, compared with the matched normal tissues. Exogenous expression of wild type SIRPalpha1, but not of a mutant SIRPalpha1 lacking the tyrosine phosphorylation sites, in SIRPalpha1-negative Huh7 human HCC cells resulted in suppression of tumor cell growth both in vitro and in vivo. Treatment of Huh7 transfectants with EGF or HGF induced tyrosine phosphorylation of SIRPalpha1 and its association with SHP-2, which were accompanied by reduced ERK1 activation. Expression of SIRPalpha1 significantly suppressed activation of NF-kappaB and also sensitized Huh7 cells to TNFalpha or cisplatin-induced cell death. In addition, SIRPalpha1-transfected Huh7 cells displayed reduced cell migration and cell spreading in a fashion that was dependent on SIRPalpha1/SHP-2 complex formation. In conclusion, a negative regulatory effect of SIRPalpha1 on hepatocarcinogenesis is exerted, at least in part, through inhibition of ERK and NF-kappaB pathways.
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Affiliation(s)
- He-Xin Yan
- International Cooperation Laboratory on Signal Transduction, Eastern Hepatobiliary Surgery Institute, Second Military Medical University, Shanghai, China
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Chen LW, Greco V, Ko CM, Li BA. Effects of symmetry energy on two-nucleon correlation functions in heavy-ion collisions induced by neutron-rich nuclei. Phys Rev Lett 2003; 90:162701. [PMID: 12731973 DOI: 10.1103/physrevlett.90.162701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2002] [Indexed: 05/24/2023]
Abstract
Using an isospin-dependent transport model, we study the effects of nuclear symmetry energy on two-nucleon correlation functions in heavy-ion collisions induced by neutron-rich nuclei. We find that the density dependence of the nuclear symmetry energy affects significantly the nucleon emission times in these collisions, leading to larger values of two-nucleon correlation functions for a symmetry energy that has a stronger density dependence. Two-nucleon correlation functions are thus useful tools for extracting information about the nuclear symmetry energy from heavy-ion collisions.
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Affiliation(s)
- Lie-Wen Chen
- Cyclotron Institute and Physics Department, Texas A&M University, College Station, Texas 77843-3366, USA
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Li BA. Probing the high density behavior of the nuclear symmetry energy with high energy heavy-ion collisions. Phys Rev Lett 2002; 88:192701. [PMID: 12005628 DOI: 10.1103/physrevlett.88.192701] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2001] [Indexed: 05/23/2023]
Abstract
High energy heavy-ion collisions are proposed as a novel means to constrain stringently the high density (HD) behavior of nuclear symmetry energy. Within an isospin-dependent hadronic transport model, it is shown for the first time that the isospin asymmetry of the HD nuclear matter formed in high energy heavy-ion collisions is uniquely determined by the HD behavior of the nuclear symmetry energy. Experimental signatures in two sensitive probes, i.e., pi(-) to pi(+) ratio and neutron-proton differential collective flow, are also investigated.
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Affiliation(s)
- Bao-An Li
- Department of Chemistry and Physics, P.O. Box 419, Arkansas State University, State University, Arkansas 72467-0419, USA.
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Li BA. Neutron-proton differential flow as a probe of isospin-dependence of the nuclear equation of state. Phys Rev Lett 2000; 85:4221-4224. [PMID: 11060603 DOI: 10.1103/physrevlett.85.4221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2000] [Indexed: 05/23/2023]
Abstract
The neutron-proton differential flow is shown to be a very useful probe of the isospin-dependence of the nuclear equation of state (EOS). This novel approach utilizes constructively both the isospin fractionation and the nuclear collective flow as well as their sensitivities to the isospin-dependence of the nuclear EOS. It also avoids effectively uncertainties associated with other dynamical ingredients of heavy-ion reactions at intermediate energies.
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Affiliation(s)
- BA Li
- Department of Chemistry and Physics, Arkansas State University, P.O. Box 419, State University, Arkansas 72467-0419, USA
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Abstract
AIM: To clone and identify the whole cDNA of MXR7 gene and to find out its expression in human HCC, and normal tissues.
METHODS: The DNA primers were designed and synthesized accordin g to the whole cDNA sequence of MXR7 gene. The cDNA of human HCC was taken a s the template while the cDNA of MXR7 gene was synthesized by polymerase cha in reaction (PCR). Recombinant DNA conforming to reading frame was constructed b y connecting purified PCR product of the cDNA of MXR7 gene with expression v ector pGEX-5X-1 of fusion protein. The plasmid MXR7/pGEX-5X-1 was identi fied by sequencing. Using 32P labeled MXR7 cDNA as probe, MXR7 mRNA expression was detected by Northern blot analysis in 12 different human no rmal tissues, 7 preoperatively untreated non-liver tumor tissues, 30 preoperati vely untreated HCC, the paracancerous liver tissues and 12 normal liver tissues samples.
RESULTS: Restriction enzyme and sequence analysis confirmed tha t the insertion sequence in vector pGEX-5X-1 was the same as the cDNA sequence of MXR7 gene. Northern blot analysis showed no expression of MXR7 mRNA in 12 kinds of normal human tissues including liver, 7 tumor tissues in other si tes and 12 normal liver tissues, the frequencies of MXR7 mRNA expression in HCC and paracancerous liver tissues were 76.6% and 13.3%, respectively. The frequency of MXR7 mRNA expression in HCC without elevation of serum AFP and in HCC < 5 cm was 90% (9/10) and 83.3% (5/6), respectively.
CONCLUSION: MXR7 mRNA is highly expressed in human HCC, which is specific and occurs at an early stage of HCC, suggesting MXR7 mRNA can be a tumor biomarker for HCC. The detection of MXR7 mRNA expression in the biopsied liver tissue is helpful in discovering early subclinical liver cancer in those with negative serum AFP.
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Li BA, Ko CM. Kaon dispersion relation and flow in relativistic heavy-ion collisions. Phys Rev C Nucl Phys 1996; 54:3283-3285. [PMID: 9971706 DOI: 10.1103/physrevc.54.3283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA, Ko CM, Li GQ. pt dependence of transverse flow in relativistic heavy-ion collisions. Phys Rev C Nucl Phys 1996; 54:844-847. [PMID: 9971410 DOI: 10.1103/physrevc.54.844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA, Ren Z, Ko CM, Yennello SJ. Isospin dependence of collective flow in heavy-ion collisions at intermediate energies. Phys Rev Lett 1996; 76:4492-4495. [PMID: 10061305 DOI: 10.1103/physrevlett.76.4492] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Li BA, Ko CM. Pion flow and antiflow in relativistic heavy-ion collisions. Phys Rev C Nucl Phys 1996; 53:R22-R24. [PMID: 9970975 DOI: 10.1103/physrevc.53.r22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA, Yennello SJ. Isospin nonequilibrium in heavy-ion collisions at intermediate energies. Phys Rev C Nucl Phys 1995; 52:R1746-R1749. [PMID: 9970756 DOI: 10.1103/physrevc.52.r1746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Abstract
Five patients with systemic lupus erythematosus (SLE) were perfused through an extracorporeal shunt filled with DNA-immunoadsorbent (DNA immobilized on carbonized resin beads). High concentrations of anti-DNA antibodies (36.4-67.0%) (binding percentage with 125I-DNA) in the serum of SLE patients were reduced to 13.8-53.0%, respectively. The highest removal percentage was 62.1%. Although the decline levels varied, the symptoms of patients, i.e., long-term severe joint pain, severe edema, hydropericardium, and ascites were all relieved considerably. The immunoadsorbent showed satisfactory blood compatibility.
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Affiliation(s)
- C L Gao
- Institute for Molecular Biology, Nankai University, Tianjin, China
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Li BA, Ko CM, Li GQ. Effects of N*(1440) resonance on particle production in heavy-ion collisions at subthreshold energies. Phys Rev C Nucl Phys 1994; 50:R2675-R2679. [PMID: 9970032 DOI: 10.1103/physrevc.50.r2675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA. Near-threshold K+ production in heavy-ion collisions. Phys Rev C Nucl Phys 1994; 50:2144-2151. [PMID: 9969892 DOI: 10.1103/physrevc.50.2144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA. Decay constants and masses of octet pseudoscalar mesons. Phys Rev D Part Fields 1994; 50:2343-2346. [PMID: 10017868 DOI: 10.1103/physrevd.50.2343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Li BA. In-medium cross section and disappearance of flow. Phys Rev C Nucl Phys 1993; 48:2415-2418. [PMID: 9969098 DOI: 10.1103/physrevc.48.2415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA. Measuring dynamical fluctuations in relativistic heavy ion collisions. Phys Rev C Nucl Phys 1993; 47:693-702. [PMID: 9968487 DOI: 10.1103/physrevc.47.693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA, Bauer W, Bertsch GF. Preferential emission of pions in asymmetric nucleus-nucleus collisions. Phys Rev C Nucl Phys 1991; 44:2095-2099. [PMID: 9967632 DOI: 10.1103/physrevc.44.2095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA, Bauer W. Pion spectra in a hadronic transport model for relativistic heavy ion collisions. Phys Rev C Nucl Phys 1991; 44:450-462. [PMID: 9967416 DOI: 10.1103/physrevc.44.450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Ishikawa K, Tanaka I, Liu KF, Li BA. Tensor-meson dominance and glueball candidate theta (1720). Phys Rev D Part Fields 1988; 37:3216-3219. [PMID: 9958610 DOI: 10.1103/physrevd.37.3216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li BA, Shen QX, Liu KF. Helicity amplitudes of the process J/ psi --> gamma theta in the glueball picture of theta(1700). Int J Clin Exp Med 1987; 35:1070-1073. [PMID: 9957755 DOI: 10.1103/physrevd.35.1070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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