Objective To investigate the frequency of t(14; 18) in different subtypes of B-cell lymphomas and the ability or the polymerase chain reaction(PCR) to detect this rearrangement in frozen samples. Methods 1o7 cases of ...Objective To investigate the frequency of t(14; 18) in different subtypes of B-cell lymphomas and the ability or the polymerase chain reaction(PCR) to detect this rearrangement in frozen samples. Methods 1o7 cases of B-cell lymphomas were studied uslng DNA extracted from rresh-frozen tissues. The DNA samples were amplified by PCR for bcl-2 MBR/JH. The products of bcl-2/JH rearrangement were hybridized with an internal olignucleotide probe or bcl-2 MBR. Results The rearranged bcl-2MBR/JH gene was detected in 13 of the 25(52. o% ) follicular center lymphomas, according to REAL classification: 8 of 11 (72. 7%) grade 1, 2 of 5(40. 0%) grade I, and 3 of 90 (33. 3%) grade, 17 of 82(2o. 8%) cases or difruse large B-cell lymphomas were found to have detectable bel-2 MBR/J. rearrangement- Conclusion The rrequency or bcl-2 MBR/JH rearrangement in diffuse large B-cell lymphomas is significantly lower than those in follicular center lympkomas(X2= 9. 28, P <o. oo5), suggesting that bcl2/JH rearrangements occur mainly in follicular center lymphomas. in addition, the result of reconstruction experiments suggest that amplification or bcl-2 MBR/JH rearrangements by PCR is both sensitive and specific for detection of t (14; 18 ) translocation.展开更多
Objective:The function of euchromatic histone-lysine N-methyltransferase 2(EHMT2)has been studied in several cancers;however,little is known about its role in mantle cell lymphoma(MCL).Thus,this study aimed to charact...Objective:The function of euchromatic histone-lysine N-methyltransferase 2(EHMT2)has been studied in several cancers;however,little is known about its role in mantle cell lymphoma(MCL).Thus,this study aimed to characterize the significance and function of EHMT2 in MCL.Methods:EHMT2 expression in MCL and reactive hyperplasia(RH)were investigated by immunohistochemistry.Genome-wide analysis of DNA methylation was performed on EHMT2+MCL samples.The function of EHMT2 was determined by CCK&flow cytometry,and western blot assays.Gene expression profile analysis was performed before and after EHMT2 knockdown to search for EHMT2-regulated genes.Co-immunoprecipitation(Co-IP)experiments were conducted to identify the proteins interacting with EHMT2.Results:EHMT2 was expressed in 68.57%(24/35)of MCLs but not in any RHs.Genome-wide analysis of DNA methylation on EHMT2+MCLs revealed that multiple members of the HOX,FOX,PAX,SOX,and CDX families were hypermethylated or hypomethylated in EHMT2+MCLs.BIX0I294,a EHMT2 inhibitor,inhibited MCL cell growth and stalled cells in the G1 phase.Additionally,BIX01294 downregulated the expressions of cell cycle proteins,cyclin DI,CDK4,and P21,but upregulated the expressions of apoptosis-related proteins,Bax and caspase-3.Co-IP experiments revealed that EHMT2 interacted with UHRF1,HDAC1,and HDAC2 but not with HDCA3.After EHMT2 knockdown,multiple genes were regulated,including CD5 and CCND1,mostly enriched in the Tec kinase signaling pathway.In addition,several genes(e.g.,MARCH 1,CCDC50,HIP1,and WNT3)were aberrantly methylated in EHMT2+MCLs.Conclusions:For the first time,we determined the significance of EHMT2 in MCL and identified potential EHMT2-regulated genes.展开更多
Costimulation plays very important role in T cells activation and tumor immunity. B71 is alone of the major costimulatory molecules both in human and rodents. Previous work indicated that B71 gene transfected EL4 lymp...Costimulation plays very important role in T cells activation and tumor immunity. B71 is alone of the major costimulatory molecules both in human and rodents. Previous work indicated that B71 gene transfected EL4 lymphoma can induce antitumor immunity in vivo. This paper showed that inoculation of EL4B71+ plus IL2 could elicit an antitumor effects in vivo and in vitro. Immunization with EL4B71+ tumor cells or EL4B71+ tumor cells plus IL2 could significantly prolong the survival time of the EL4 tumorbearing mice and also delay the occurrence of the tumor node in vivo. A strong proliferation response and CTL activity as well as the increased IL2 and TNF production of the splenocyte from the immunized mice with EL4B71+ or EL4B71+ plus IL2 were seen in the in vitro TLMC system. These finding indicated that the costimulatory molecule is necessary for inducing an effective antitumor immunity and IL2 optimal production.展开更多
目的:筛选c-MYC/Bcl-2重排的弥漫大B细胞淋巴瘤(diffuse large B-cell lymphoma,DLBCL)潜在的高风险致病基因及致病通路,为此类淋巴瘤的发病机制提供理论依据。方法:从基因表达数据库(GEO)下载GSE44164及GSE43677数据集,选择c-MYC/Bcl-...目的:筛选c-MYC/Bcl-2重排的弥漫大B细胞淋巴瘤(diffuse large B-cell lymphoma,DLBCL)潜在的高风险致病基因及致病通路,为此类淋巴瘤的发病机制提供理论依据。方法:从基因表达数据库(GEO)下载GSE44164及GSE43677数据集,选择c-MYC/Bcl-2重排的DLBCL数据为实验组、生发中心B细胞为对照组。采用R程序语言的limma包、WGCNA包及clusterProfiler包对获得的mRNA转录组数据进行差异表达分析、基因共表达变化分析、GO功能富集分析与KEGG信号通路富集分析。使用STRING数据库对差异表达基因(DEGs)进行蛋白互相作用网络分析,并使用Cytoscape软件内置的插件(包括CytoHubba及CytoNca插件)筛选核心基因。采用第二代高通量测序技术对IM-9细胞系及DOHH-2细胞系进行mRNA转录组测序,使用Read count值将核心基因进行配对样本t检验,筛选P值具有统计学意义的基因为疾病的核心基因。挑选部分关键基因使用Western Blot技术在蛋白层面进行验证。结果:差异分析共得到835个DEGs,WGCNA获得一个与c-MYC/Bcl-2重排的DLBCL高度相关的模块(turquoise模块,cor=0.86,P值<0.05)。GO富集分析结果显示生物学进程BP共富集到1 437条,细胞组分CC富集到123条,分子功能相关MF富集到147条;KEGG富集到72条相关通路,主要与ECM受体相互作用、B细胞受体信号通路及PI3K-Akt信号通路等相关。STRING数据库中PPI网络共得到284个相互关联作用的蛋白质,通过Cytoscape软件进一步筛选,再通过二代高通量测序及蛋白验证得出COL1A1、COL3A1、COL1A2、MMP2、COL5A1、COL5A2、COL4A2、TIMP1、MMP9、POSTN、BGN、DCN、LUM为此类淋巴瘤的核心基因,影响此类淋巴瘤细胞生存、侵袭和迁移等。结论:使用生物信息学及基础实验相结合的方法探究与c-MYC/Bcl-2重排的DLBCL淋巴瘤细胞致病或侵袭迁移等相关的关键基因,为更深入地探索此类淋巴瘤发生发展机制及寻找相关靶向药物提供理论依据。展开更多
文摘Objective To investigate the frequency of t(14; 18) in different subtypes of B-cell lymphomas and the ability or the polymerase chain reaction(PCR) to detect this rearrangement in frozen samples. Methods 1o7 cases of B-cell lymphomas were studied uslng DNA extracted from rresh-frozen tissues. The DNA samples were amplified by PCR for bcl-2 MBR/JH. The products of bcl-2/JH rearrangement were hybridized with an internal olignucleotide probe or bcl-2 MBR. Results The rearranged bcl-2MBR/JH gene was detected in 13 of the 25(52. o% ) follicular center lymphomas, according to REAL classification: 8 of 11 (72. 7%) grade 1, 2 of 5(40. 0%) grade I, and 3 of 90 (33. 3%) grade, 17 of 82(2o. 8%) cases or difruse large B-cell lymphomas were found to have detectable bel-2 MBR/J. rearrangement- Conclusion The rrequency or bcl-2 MBR/JH rearrangement in diffuse large B-cell lymphomas is significantly lower than those in follicular center lympkomas(X2= 9. 28, P <o. oo5), suggesting that bcl2/JH rearrangements occur mainly in follicular center lymphomas. in addition, the result of reconstruction experiments suggest that amplification or bcl-2 MBR/JH rearrangements by PCR is both sensitive and specific for detection of t (14; 18 ) translocation.
基金This study was supported by the National Natural Science Foundation of China(Grant No.81272277)the Natural Science Foundation of Shandong Province(Grant No.ZR2018MH020).
文摘Objective:The function of euchromatic histone-lysine N-methyltransferase 2(EHMT2)has been studied in several cancers;however,little is known about its role in mantle cell lymphoma(MCL).Thus,this study aimed to characterize the significance and function of EHMT2 in MCL.Methods:EHMT2 expression in MCL and reactive hyperplasia(RH)were investigated by immunohistochemistry.Genome-wide analysis of DNA methylation was performed on EHMT2+MCL samples.The function of EHMT2 was determined by CCK&flow cytometry,and western blot assays.Gene expression profile analysis was performed before and after EHMT2 knockdown to search for EHMT2-regulated genes.Co-immunoprecipitation(Co-IP)experiments were conducted to identify the proteins interacting with EHMT2.Results:EHMT2 was expressed in 68.57%(24/35)of MCLs but not in any RHs.Genome-wide analysis of DNA methylation on EHMT2+MCLs revealed that multiple members of the HOX,FOX,PAX,SOX,and CDX families were hypermethylated or hypomethylated in EHMT2+MCLs.BIX0I294,a EHMT2 inhibitor,inhibited MCL cell growth and stalled cells in the G1 phase.Additionally,BIX01294 downregulated the expressions of cell cycle proteins,cyclin DI,CDK4,and P21,but upregulated the expressions of apoptosis-related proteins,Bax and caspase-3.Co-IP experiments revealed that EHMT2 interacted with UHRF1,HDAC1,and HDAC2 but not with HDCA3.After EHMT2 knockdown,multiple genes were regulated,including CD5 and CCND1,mostly enriched in the Tec kinase signaling pathway.In addition,several genes(e.g.,MARCH 1,CCDC50,HIP1,and WNT3)were aberrantly methylated in EHMT2+MCLs.Conclusions:For the first time,we determined the significance of EHMT2 in MCL and identified potential EHMT2-regulated genes.
文摘Costimulation plays very important role in T cells activation and tumor immunity. B71 is alone of the major costimulatory molecules both in human and rodents. Previous work indicated that B71 gene transfected EL4 lymphoma can induce antitumor immunity in vivo. This paper showed that inoculation of EL4B71+ plus IL2 could elicit an antitumor effects in vivo and in vitro. Immunization with EL4B71+ tumor cells or EL4B71+ tumor cells plus IL2 could significantly prolong the survival time of the EL4 tumorbearing mice and also delay the occurrence of the tumor node in vivo. A strong proliferation response and CTL activity as well as the increased IL2 and TNF production of the splenocyte from the immunized mice with EL4B71+ or EL4B71+ plus IL2 were seen in the in vitro TLMC system. These finding indicated that the costimulatory molecule is necessary for inducing an effective antitumor immunity and IL2 optimal production.
