目的研究丙型肝炎病毒(HCV)基因组核酸在亚甲蓝光化学法(methelene blue photochemistry,MB-P)灭活病毒前后的变化,在全基因组水平分析MB-P对基因组各结构区段的降解作用。方法含HCV的血浆中加入终浓度为1.0μmol/L的MB,经约30000Lux强...目的研究丙型肝炎病毒(HCV)基因组核酸在亚甲蓝光化学法(methelene blue photochemistry,MB-P)灭活病毒前后的变化,在全基因组水平分析MB-P对基因组各结构区段的降解作用。方法含HCV的血浆中加入终浓度为1.0μmol/L的MB,经约30000Lux强度的荧光照射后,在不同作用时间点取样;将HCV全基因组序列分为互相重叠的8个区段,分别进行RT-PCR,分析基因组核酸的完整性;同时运用实时定量PCR(real time-PCR,RT-PCR)技术观察核酸降解的动力学变化。结果基因组各区段RT-PCR结果发现,经过不同的光照时间,HCV基因组各区段的稳定性不同,第2、4、5、6区段对MB-P作用较敏感,基因组5’端区段和3’端区段经MB-P作用后的稳定性高于基因组其它区段;RT-PCR结果显示,随着光照时间延长,可被检测到的病毒核酸拷贝数逐渐下降。结论MB-P灭活过程中HCV基因组核酸被降解,而且基因组不同区段对光化学作用的反应性不同,提示RNA降解可能是病毒灭活的重要机制;检测病毒核酸稳定性以监测病毒灭活具有一定临床实用价值。展开更多
Foot-and-mouth disease virus （FMDV） is highly contagious and responsible for huge outbreaks among cloven hoofed animals. The aim of the present study is to evaluate a plasmid DNA immunization system that expresses t...Foot-and-mouth disease virus （FMDV） is highly contagious and responsible for huge outbreaks among cloven hoofed animals. The aim of the present study is to evaluate a plasmid DNA immunization system that expresses the FMDV/OflRN/2007 VP1 gene and compare it with the conventional inactivated vaccine in an animal model. The VP1 gene was sub-cloned into the unique Kpn I and BamH I cloning sites of the peDNA3.1＋ and pEGFP-N1 vectors to construct the VPI gene cassettes. The transfected BHKT7 cells with sub-cloned pEGFP-N1-VP1 vector expressed GFP-VP1 fusion protein and displayed more green fluorescence spots than the transfected BHKT7 cells with pEGFP-N1 vector, which solely expressed the GFP protein. Six mice groups were respectively immunized by the sub-cloned pcDNA3.1＋-VP1 gene cassette as the DNA vaccine, DNA vaccine and PCMV-SPORT-GMCSF vector （as molecular adjuvant） together, conventional vaccine, PBS （as negative control）, pcDNA3.1＋ vector （as control group） and PCMV-SPORT vector that contained the GMCSF gene （as control group）. Significant neutralizing antibody responses were induced in the mice which were immunized using plasmid vectors expressing the VP1 and GMCSF genes together, the DNA vaccine alone and the conventional inactivated vaccine （P〈0.05）. Co-administration of DNA vaccine and GMCSF gene improved neutralizing antibody response in comparison with administration of the DNA vaccine alone, but this response was the most for the conventional vaccine group. However, induction of humeral immunity response in the conventional vaccine group was more protective than for the DNA vaccine, but T-cell proliferation and IFN-？ concentration were the most in DNA vaccine with the GMCSF gene. Therefore the group that was vaccinated by DNA vaccine with the GMCSF gene, showed protective neutralizing antibody response and the most Thl cellular immunity.展开更多
To determine the frequency of p16 gene inactivation in leukemia cells, and to evaluate their value in the prediction of their clinical outcome. Bone marrow or peripheral blood samples from...To determine the frequency of p16 gene inactivation in leukemia cells, and to evaluate their value in the prediction of their clinical outcome. Bone marrow or peripheral blood samples from 48 patients with leukemia were examined by multiplex polymerase chain reaction(MPCR) to detect p16 gene homozygous deletion, and restriction enzyme PCR to detect p16 gene methylation. p16 gene inactivation were detected in 10 of the 48 patients(20.4%). They were five patients with p16 homozygous deletion, and five patients with p16 methylation, respectively. p16 gene inactivation correlates with adverse prognosis features. The patients with p16 inactivation had poor response to chemotherapy, and had significantly shorter survival times than the patients in whom p16 gene was preserved(P<0.001). The inactivation of p16 gene play a key role in the pathogenesis and the progression of some leukemia. The detection of p16 gene is reliable prognostic factor that predict shortened survival times.展开更多
OBJECTIVE To investigate the mechanism of hMLH1 deregulation in non-small cell lung cancer （NSCLC）. METHODS A genetic and epigenetic study of the hMLH1 gene was performed using surgical primary tumors from 40 NSCLC ...OBJECTIVE To investigate the mechanism of hMLH1 deregulation in non-small cell lung cancer （NSCLC）. METHODS A genetic and epigenetic study of the hMLH1 gene was performed using surgical primary tumors from 40 NSCLC patients and their corresponding noncancerous tissues. The molecular alterations examined included promoter methylation by Hpa Ⅱ/Msp Ⅰ- based PCR analysis, loss of heterozygosity （LOH） by D3S1621 locus PCR-electrophoresis-silver staining, as well as the loss of protein expression by immunohistochemical analysis. RESULTS The frequencies of hypermethylation, LOH and loss of protein expression of hMLH1 were 67.5% （27/40）, 65% （26/40） and 72.5% （29/ 40）, respectively. Among 26 hMLH1 gene LOH （＋） cases, 21 （80.8%） showed hypermethylation, which was significantly higher than the group of LOH （-）. The frequency of the double inactivation of the hMLH1 gene by hypermethylation and LOH related to a loss of protein expression of 72.4% （21/29）. CONCLUSION Biallelic inactivation of the hMLH1 gene by hypermethylation and LOH most likely will cause loss of hMLH1 protein expression and play an important role in the development of NSCLC. Therefore, controlling and monitoring for hypermethylation of the hMLH1 gene may be partially useful for treatment and early diagnosis of NSCLC.展开更多
文摘目的研究丙型肝炎病毒(HCV)基因组核酸在亚甲蓝光化学法(methelene blue photochemistry,MB-P)灭活病毒前后的变化,在全基因组水平分析MB-P对基因组各结构区段的降解作用。方法含HCV的血浆中加入终浓度为1.0μmol/L的MB,经约30000Lux强度的荧光照射后,在不同作用时间点取样;将HCV全基因组序列分为互相重叠的8个区段,分别进行RT-PCR,分析基因组核酸的完整性;同时运用实时定量PCR(real time-PCR,RT-PCR)技术观察核酸降解的动力学变化。结果基因组各区段RT-PCR结果发现,经过不同的光照时间,HCV基因组各区段的稳定性不同,第2、4、5、6区段对MB-P作用较敏感,基因组5’端区段和3’端区段经MB-P作用后的稳定性高于基因组其它区段;RT-PCR结果显示,随着光照时间延长,可被检测到的病毒核酸拷贝数逐渐下降。结论MB-P灭活过程中HCV基因组核酸被降解,而且基因组不同区段对光化学作用的反应性不同,提示RNA降解可能是病毒灭活的重要机制;检测病毒核酸稳定性以监测病毒灭活具有一定临床实用价值。
文摘Foot-and-mouth disease virus （FMDV） is highly contagious and responsible for huge outbreaks among cloven hoofed animals. The aim of the present study is to evaluate a plasmid DNA immunization system that expresses the FMDV/OflRN/2007 VP1 gene and compare it with the conventional inactivated vaccine in an animal model. The VP1 gene was sub-cloned into the unique Kpn I and BamH I cloning sites of the peDNA3.1＋ and pEGFP-N1 vectors to construct the VPI gene cassettes. The transfected BHKT7 cells with sub-cloned pEGFP-N1-VP1 vector expressed GFP-VP1 fusion protein and displayed more green fluorescence spots than the transfected BHKT7 cells with pEGFP-N1 vector, which solely expressed the GFP protein. Six mice groups were respectively immunized by the sub-cloned pcDNA3.1＋-VP1 gene cassette as the DNA vaccine, DNA vaccine and PCMV-SPORT-GMCSF vector （as molecular adjuvant） together, conventional vaccine, PBS （as negative control）, pcDNA3.1＋ vector （as control group） and PCMV-SPORT vector that contained the GMCSF gene （as control group）. Significant neutralizing antibody responses were induced in the mice which were immunized using plasmid vectors expressing the VP1 and GMCSF genes together, the DNA vaccine alone and the conventional inactivated vaccine （P〈0.05）. Co-administration of DNA vaccine and GMCSF gene improved neutralizing antibody response in comparison with administration of the DNA vaccine alone, but this response was the most for the conventional vaccine group. However, induction of humeral immunity response in the conventional vaccine group was more protective than for the DNA vaccine, but T-cell proliferation and IFN-？ concentration were the most in DNA vaccine with the GMCSF gene. Therefore the group that was vaccinated by DNA vaccine with the GMCSF gene, showed protective neutralizing antibody response and the most Thl cellular immunity.
文摘To determine the frequency of p16 gene inactivation in leukemia cells, and to evaluate their value in the prediction of their clinical outcome. Bone marrow or peripheral blood samples from 48 patients with leukemia were examined by multiplex polymerase chain reaction(MPCR) to detect p16 gene homozygous deletion, and restriction enzyme PCR to detect p16 gene methylation. p16 gene inactivation were detected in 10 of the 48 patients(20.4%). They were five patients with p16 homozygous deletion, and five patients with p16 methylation, respectively. p16 gene inactivation correlates with adverse prognosis features. The patients with p16 inactivation had poor response to chemotherapy, and had significantly shorter survival times than the patients in whom p16 gene was preserved(P<0.001). The inactivation of p16 gene play a key role in the pathogenesis and the progression of some leukemia. The detection of p16 gene is reliable prognostic factor that predict shortened survival times.
文摘OBJECTIVE To investigate the mechanism of hMLH1 deregulation in non-small cell lung cancer （NSCLC）. METHODS A genetic and epigenetic study of the hMLH1 gene was performed using surgical primary tumors from 40 NSCLC patients and their corresponding noncancerous tissues. The molecular alterations examined included promoter methylation by Hpa Ⅱ/Msp Ⅰ- based PCR analysis, loss of heterozygosity （LOH） by D3S1621 locus PCR-electrophoresis-silver staining, as well as the loss of protein expression by immunohistochemical analysis. RESULTS The frequencies of hypermethylation, LOH and loss of protein expression of hMLH1 were 67.5% （27/40）, 65% （26/40） and 72.5% （29/ 40）, respectively. Among 26 hMLH1 gene LOH （＋） cases, 21 （80.8%） showed hypermethylation, which was significantly higher than the group of LOH （-）. The frequency of the double inactivation of the hMLH1 gene by hypermethylation and LOH related to a loss of protein expression of 72.4% （21/29）. CONCLUSION Biallelic inactivation of the hMLH1 gene by hypermethylation and LOH most likely will cause loss of hMLH1 protein expression and play an important role in the development of NSCLC. Therefore, controlling and monitoring for hypermethylation of the hMLH1 gene may be partially useful for treatment and early diagnosis of NSCLC.
