Objective： To investigate the expression of cyclooxygenase-2 （COX-2） mRNA in drug-sensitive cell and drugresistant clones of ovarian cancer cell lines. Methods： RT-PCR and immunocytochemistry were used to investig...Objective： To investigate the expression of cyclooxygenase-2 （COX-2） mRNA in drug-sensitive cell and drugresistant clones of ovarian cancer cell lines. Methods： RT-PCR and immunocytochemistry were used to investigate the expression of cyclooxygenase-2 in 3 clones drug-sensitive and 5 clones drug-resistant ovarian cancer cell. Results： Strong COX-2 mRNA expressions were detected in 3 clones of drug-sensitive cell and weak expressions were detected in 5 clones of drug-resistant cell. The protein expression of COX-2 in drug-sensitive cell was strongly positive reaction in immunocytochemistry stain and there was a weak positive reaction in 5 clones of drug-resistant cell. Conclusion： The expression of COX-2 mRNA in drug-sensitive cell strains is much higher than that in drugresistant strains of ovarian cancer cell lines, providing a basis of the chemoprevention for ovarian cancer.展开更多
Objective The mode of human immunodeficiency virus(HIV) transmission via injection drug use(IDU)still exists, and the recent shift in IDU-related transmission of HIV infection is largely unknown. The purpose of this s...Objective The mode of human immunodeficiency virus(HIV) transmission via injection drug use(IDU)still exists, and the recent shift in IDU-related transmission of HIV infection is largely unknown. The purpose of this study was to analyze the spatiotemporal sources and dynamics of HIV-1 transmission through IDU in Guangxi.Methods We performed a molecular epidemiological investigation of infections across Guangxi from2009 to 2019. Phylogenetic and Bayesian time-geographic analyses of HIV-1 sequences were performed to confirm the characteristics of transmission between IDUs in combination with epidemiological data.Results Among the 535 subjects, CRF08_BC(57.4%), CRF01_AE(28.4%), and CRF07_BC(10.7%) were the top 3 HIV strains;72.6% of infections were linked to other provinces in the transmission network;93.6% of sequence-transmitted strains were locally endemic, with the rest coming from other provinces,predominantly Guangdong and Yunnan;92.1% of the HIV transmission among people who inject drugs tended to be transmitted between HIV-positive IDUs.Conclusion HIV recombinants were high diversity, and circulating local strains were the transmission sources among IDUs in Guangxi. However, there were still cases of IDUs linked to other provinces.Coverage of traditional prevention strategies should be expanded, and inter-provincial collaboration between Guangxi, Yunnan, and Guangdong provinces should be strengthened.展开更多
Objective:To produce comparative data on a group of Trichomonas vaginalis clonal strains with varied drug responses using identical methods and materials.Methods:Five clonal strains of Trichomonas vaginalis were isola...Objective:To produce comparative data on a group of Trichomonas vaginalis clonal strains with varied drug responses using identical methods and materials.Methods:Five clonal strains of Trichomonas vaginalis were isolated from reference strain using agar plate technique.The variability of growth kinetic and susceptibility of clonal strain to metronidazole,tinidazole, satranidazole and nitazoxanide were observed in 96 well microlilre plate.Results:Among these clonal strains there was a good correlation between rates of growth with the relative susceptibility of the strains to drugs in vitro.Regarding metronidazole,tinidazole and satranidazole susceptibility,different degrees of susceptibility were determined.However,no difference in nitazoxanide susceptibility was found between the clonal strain tested and a reference strain. Conclusions:This is the first description of biological variability in clonal stock of Trichomonas vaginalis.Different degrees of drug susceptibility were determined among clonal strains tested. Further studies will be necessary to ascertain the importance of this variability in clinical infection.展开更多
Background and Aims:Lamivudine(3TC),telbivudine(LdT),entecavir(ETV),adefovir(ADF),and tenofovir(TFV)are drugs used to treat hepatitis B virus(HBV)infection,but specific mutations allow some viruses to become resistant...Background and Aims:Lamivudine(3TC),telbivudine(LdT),entecavir(ETV),adefovir(ADF),and tenofovir(TFV)are drugs used to treat hepatitis B virus(HBV)infection,but specific mutations allow some viruses to become resistant to antiviral drugs or to acquire immune escape capacities.These mutations have not been thoroughly investigated in Mexico.This study aimed to estimate the prevalence of HBV antiviral resistance and escape mutations.Methods:This cross-sectional study analyzed 158 samples.HBV DNA was extracted,amplified,and sequenced in serum samples using the spin column method,PCR assay,and Sanger’s sequencing,respectively.HBV genotypes were determined,and HBV mutations were tested using the Geno2pheno tool.Results:Overall,68.4%(108/158)of HBV patients were infected with genotype H,followed by G(11.4%,18/158),A2(10.8%,17/158),F1b(6.9.0%,11/158),D(1.9%,3/158),and E(0.6%,1/158),and 5.1%(8/158)had evidence of recombination.The prevalence of resistance mutations was 8.2%(13/158)and the most common combined mutation was rt180M+rt204V.Notably,we found the combinations rt180M+rt204V+rt173L(n=2)and rt180M+rt204V+rt202G(n=1)that confer multidrug resistance to 3TC,LdT,and ETV.Resistance mutations were found in genotypes A2(11.8%,2/17),and H(10.2%,11/108),and escape mutations were detected in HBV genotypes A2(11.8%,2/17),H(10.2%,11/108),F1b(9.1%,1/11)and G(5.6%,1/18).Conclusions:The highest prevalence of antiviral resistance mutations or escape mutations was detected in HBV genotypes A2 and H.The earliest cases of HBV multidrug resistance were detected in Mexico.展开更多
基金National Natural Science Foundation of China (No.30070786)
文摘Objective： To investigate the expression of cyclooxygenase-2 （COX-2） mRNA in drug-sensitive cell and drugresistant clones of ovarian cancer cell lines. Methods： RT-PCR and immunocytochemistry were used to investigate the expression of cyclooxygenase-2 in 3 clones drug-sensitive and 5 clones drug-resistant ovarian cancer cell. Results： Strong COX-2 mRNA expressions were detected in 3 clones of drug-sensitive cell and weak expressions were detected in 5 clones of drug-resistant cell. The protein expression of COX-2 in drug-sensitive cell was strongly positive reaction in immunocytochemistry stain and there was a weak positive reaction in 5 clones of drug-resistant cell. Conclusion： The expression of COX-2 mRNA in drug-sensitive cell strains is much higher than that in drugresistant strains of ovarian cancer cell lines, providing a basis of the chemoprevention for ovarian cancer.
基金National Natural Science Foundation of China [grant no. 82060610]National Natural Science Foundation of China [grant no. 82103899]+2 种基金Guangxi Scientific and Technological Key Project[Gui Ke AB19245038]Guangxi Scientific and Technological Key Project [Guike 2022AC23005, 2022AC20031,2022JJA141110]Science and Technology Project of Nanning [20223051]。
文摘Objective The mode of human immunodeficiency virus(HIV) transmission via injection drug use(IDU)still exists, and the recent shift in IDU-related transmission of HIV infection is largely unknown. The purpose of this study was to analyze the spatiotemporal sources and dynamics of HIV-1 transmission through IDU in Guangxi.Methods We performed a molecular epidemiological investigation of infections across Guangxi from2009 to 2019. Phylogenetic and Bayesian time-geographic analyses of HIV-1 sequences were performed to confirm the characteristics of transmission between IDUs in combination with epidemiological data.Results Among the 535 subjects, CRF08_BC(57.4%), CRF01_AE(28.4%), and CRF07_BC(10.7%) were the top 3 HIV strains;72.6% of infections were linked to other provinces in the transmission network;93.6% of sequence-transmitted strains were locally endemic, with the rest coming from other provinces,predominantly Guangdong and Yunnan;92.1% of the HIV transmission among people who inject drugs tended to be transmitted between HIV-positive IDUs.Conclusion HIV recombinants were high diversity, and circulating local strains were the transmission sources among IDUs in Guangxi. However, there were still cases of IDUs linked to other provinces.Coverage of traditional prevention strategies should be expanded, and inter-provincial collaboration between Guangxi, Yunnan, and Guangdong provinces should be strengthened.
基金One of us (HC) is grateful to NIPER for providing financial assistance
文摘Objective:To produce comparative data on a group of Trichomonas vaginalis clonal strains with varied drug responses using identical methods and materials.Methods:Five clonal strains of Trichomonas vaginalis were isolated from reference strain using agar plate technique.The variability of growth kinetic and susceptibility of clonal strain to metronidazole,tinidazole, satranidazole and nitazoxanide were observed in 96 well microlilre plate.Results:Among these clonal strains there was a good correlation between rates of growth with the relative susceptibility of the strains to drugs in vitro.Regarding metronidazole,tinidazole and satranidazole susceptibility,different degrees of susceptibility were determined.However,no difference in nitazoxanide susceptibility was found between the clonal strain tested and a reference strain. Conclusions:This is the first description of biological variability in clonal stock of Trichomonas vaginalis.Different degrees of drug susceptibility were determined among clonal strains tested. Further studies will be necessary to ascertain the importance of this variability in clinical infection.
基金funded in part by Consejo Nacional de Ciencia y Tecnologia(CONACYT)grant number PN-2017-5254 to AP,FOSSIS-S0008-2010-1-08-139085 to SRthe Programa de Apoyo a la Incorporación de NPTC.No.UDG-PTC-1439 to AJ-A.
文摘Background and Aims:Lamivudine(3TC),telbivudine(LdT),entecavir(ETV),adefovir(ADF),and tenofovir(TFV)are drugs used to treat hepatitis B virus(HBV)infection,but specific mutations allow some viruses to become resistant to antiviral drugs or to acquire immune escape capacities.These mutations have not been thoroughly investigated in Mexico.This study aimed to estimate the prevalence of HBV antiviral resistance and escape mutations.Methods:This cross-sectional study analyzed 158 samples.HBV DNA was extracted,amplified,and sequenced in serum samples using the spin column method,PCR assay,and Sanger’s sequencing,respectively.HBV genotypes were determined,and HBV mutations were tested using the Geno2pheno tool.Results:Overall,68.4%(108/158)of HBV patients were infected with genotype H,followed by G(11.4%,18/158),A2(10.8%,17/158),F1b(6.9.0%,11/158),D(1.9%,3/158),and E(0.6%,1/158),and 5.1%(8/158)had evidence of recombination.The prevalence of resistance mutations was 8.2%(13/158)and the most common combined mutation was rt180M+rt204V.Notably,we found the combinations rt180M+rt204V+rt173L(n=2)and rt180M+rt204V+rt202G(n=1)that confer multidrug resistance to 3TC,LdT,and ETV.Resistance mutations were found in genotypes A2(11.8%,2/17),and H(10.2%,11/108),and escape mutations were detected in HBV genotypes A2(11.8%,2/17),H(10.2%,11/108),F1b(9.1%,1/11)and G(5.6%,1/18).Conclusions:The highest prevalence of antiviral resistance mutations or escape mutations was detected in HBV genotypes A2 and H.The earliest cases of HBV multidrug resistance were detected in Mexico.
