Analysis of the potential biological value of pyruvate dehydrogenase E1 subunitβin human cancer

BACKGROUND The pyruvate dehydrogenase E1 subunitβ(PDHB)gene which regulates energy metabolism is located in mitochondria.However,few studies have elucidated the role and mechanism of PDHB in different cancers.AIM To comprehensive pan-cancer analysis of PDHB was performed based on bioinformatics approaches to explore its tumor diagnostic and prognostic value and tumor immune relevance in cancer.In vitro experiments were performed to examine the biological regulation of PDHB in liver cancer.METHODS Pan-cancer data related to PDHB were obtained from the Cancer Genome Atlas(TCGA)database.Analysis of the gene expression profiles of PDHB was based on TCGA and Genotype Tissue Expression Dataset databases.Cox regression analysis and Kaplan-Meier methods were used to assess the correlation between PDHB expression and survival prognosis in cancer patients.The correlation between PDHB and receiver operating characteristic diagnostic curve,clinicopathological staging,somatic mutation,tumor mutation burden(TMB),microsatellite instability(MSI),DNA methylation,and drug susceptibility in pan-cancer was also analyzed.Various algorithms were used to analyze the correlation between PDHB and immune cell infiltration and tumor chemotaxis environment,as well as the co-expression analysis of PDHB and immune checkpoint(ICP)genes.The expression and functional phenotype of PDHB in single tumor cells were studied by single-cell sequencing,and the functional enrichment analysis of PDHB-related genes was performed.The study also validated the level of mRNA or protein expression of PDHB in several cancers.Finally,in vitro experiments verified the regulatory effect of PDHB on the proliferation,migration,and invasion of liver cancer.RESULTS PDHB was significantly and differently expressed in most cancers.PDHB was significantly associated with prognosis in patients with a wide range of cancers,including kidney renal clear cell carcinoma,kidney renal papillary cell carcinoma,breast invasive carcinoma,and brain lower grade glioma.In some cancers,PDHB expression was clearly associated with gene mutations,clinicopathological stages,and expression of TMB,MSI,and ICP genes.The expression of PDHB was closely related to the infiltration of multiple immune cells in the immune microenvironment and the regulation of tumor chemotaxis environment.In addition,single-cell sequencing results showed that PDHB correlated with different biological phenotypes of multiple cancer single cells.This study further demonstrated that down-regulation of PDHB expression inhibited the proliferation,migration,and invasion functions of hepatoma cells.CONCLUSION As a member of pan-cancer,PDHB may be a novel cancer marker with potential value in diagnosing cancer,predicting prognosis,and in targeted therapy.

Genetic diversity of the S-type small subunit ribosomal RNA gene of Plasmodium knowlesi isolates from Sabah,Malaysian Borneo and Peninsular Malaysia

Objective:To determine the genetic diversity of Plasmodium(P.)knowlesi isolates from Sabah,Malaysian Borneo and Peninsular Malaysia,targeting the S-type SSU rRNA gene and including aspects of natural selection and haplotype.Methods:Thirty-nine blood samples infected with P.knowlesi were collected in Sabah,Malaysian Borneo and Peninsular Malaysia.The S-type SSU rRNA gene was amplified using polymerase chain reaction,cloned into a vector,and sequenced.The natural selection and haplotype of the S-type SSU rRNA gene sequences were determined using DnaSP v6 and illustrated using NETWORK v10.This study's 39 S-type SSU rRNA sequences and eight sequences from the Genbank database were subjected to phylogenetic analysis using MEGA 11.Results:Overall,the phylogenetic analysis showed no evidence of a geographical cluster of P.knowlesi isolates from different areas in Malaysia based on the S-type SSU rRNA gene sequences.The S-type SSU rRNA gene sequences were relatively conserved and with a purifying effect.Haplotype sharing of the S-type SSU rRNA gene was observed between the P.knowlesi isolates in Sabah,Malaysian Borneo,but not between Sabah,Malaysian Borneo and Peninsular Malaysia.Conclusions:This study suggests that the S-type SSU rRNA gene of P.knowlesi isolates in Sabah,Malaysian Borneo,and Peninsular Malaysia has fewer polymorphic sites,representing the conservation of the gene.These features make the S-type SSU rRNA gene suitable for comparative studies,such as determining the evolutionary relationships and common ancestry among P.knowlesi species.

Cognitive dysfunction in schizophrenia patients caused by downregulation of γ-aminobutyric acid receptor subunits

BACKGROUND The expression pattern of gamma aminobutyric acid(GABA)receptor subunits are commonly altered in patients with schizophrenia,which may lead to nerve excitation/inhibition problems,affecting cognition,emotion,and behavior.AIM To explore GABA receptor expression and its relationship with schizophrenia and to provide insights into more effective treatments.METHODS This case-control study enrolled 126 patients with schizophrenia treated at our hospital and 126 healthy volunteers who underwent physical examinations at our hospital during the same period.The expression levels of the GABA receptor subunits were detected using 1H-magnetic resonance spectroscopy.The recognized cognitive battery tool,the MATRICS Consensus Cognitive Battery,was used to evaluate the scores for various dimensions of cognitive function.The correlation between GABA receptor subunit downregulation and schizophrenia was also analyzed.RESULTS Significant differences in GABA receptor subunit levels were found between the case and control groups(P<0.05).A significant difference was also found between the case and control groups in terms of cognitive function measures,including attention/alertness and learning ability(P<0.05).Specifically,as the expression levels of GABRA1(α1 subunit gene),GABRB2(β2 subunit gene),GABRD(δsubunit),and GABRE(εsubunit)decreased,the severity of the patients’condition increased gradually,indicating a positive correlation between the downregulation of these 4 receptor subunits and schizophrenia(P<0.05).However,the expression levels of GABRA5(α5 subunit gene)and GABRA6(α6 subunit gene)showed no significant correlation with schizophrenia(P>0.05).CONCLUSION Downregulation of the GABA receptor subunits is positively correlated with schizophrenia.In other words,when GABA receptor subunits are downregulated in patients,cognitive impairment becomes more severe.

Cardioprotective Potential of Cymbopogon citratus Essential Oil against Isoproterenol-induced Cardiomyocyte Hypertrophy:Possible Involvement of NLRP3 Inflammasome and Oxidative Phosphorylation Complex Subunits

Objective:Cymbopogon citratus(DC.)Stapf is a medicinal and edible herb that is widely used for the treatment of gastric,nervous and hypertensive disorders.In this study,we investigated the cardioprotective effects and mechanisms of the essential oil,the main active ingredient of Cymbopogon citratus,on isoproterenol(ISO)-induced cardiomyocyte hypertrophy.Methods:The compositions of Cymbopogon citratus essential oil(CCEO)were determined by gas chromatography-mass spectrometry.Cardiomyocytes were pretreated with 16.9µg/L CCEO for 1 h followed by 10µmol/L ISO for 24 h.Cardiac hypertrophy-related indicators and NLRP3 inflammasome expression were evaluated.Subsequently,transcriptome sequencing(RNA-seq)and target verification were used to further explore the underlying mechanism.Results:Our results showed that the CCEO mainly included citronellal(45.66%),geraniol(23.32%),and citronellol(10.37%).CCEO inhibited ISO-induced increases in cell surface area and protein content,as well as the upregulation of fetal gene expression.Moreover,CCEO inhibited ISO-induced NLRP3 inflammasome expression,as evidenced by decreased lactate dehydrogenase content and downregulated mRNA levels of NLRP3,ASC,CASP1,GSDMD,and IL-1β,as well as reduced protein levels of NLRP3,ASC,pro-caspase-1,caspase-1(p20),GSDMD-FL,GSDMD-N,and pro-IL-1β.The RNA-seq results showed that CCEO inhibited the increase in the mRNA levels of 26 oxidative phosphorylation complex subunits in ISO-treated cardiomyocytes.Our further experiments confirmed that CCEO suppressed ISO-induced upregulation of mt-Nd1,Sdhd,mt-Cytb,Uqcrq,and mt-Atp6 but had no obvious effects on mt-Col expression.Conclusion:CCEO inhibits ISO-induced cardiomyocyte hypertrophy through the suppression of NLRP3 inflammasome expression and the regulation of several oxidative phosphorylation complex subunits.

Overexpression of proteasome 26S subunit non-ATPase 6 protein and its clinicopathological significance in intrahepatic cholangiocarcinoma

BACKGROUND Currently,intrahepatic cholangiocarcinoma(ICC)poses a continuing,significant health challenge,but the relationship has yet to be established between ICC and the proteasome 26S subunit non-ATPase 6(PSMD6).AIM To investigate the protein expression and clinicopathological significance of PSMD6 in ICC.METHODS The potential impact of the PSMD6 gene on the growth of ICC cell lines was analyzed using clustered regularly interspaced short palindromic repeat knockout screening technology.Forty-two paired specimens of ICC and adjacent noncancerous tissues were collected.PSMD6 protein expression was determined by immunohistochemistry.Receiver operating characteristic curve analysis was performed to validate PSMD6 expression level,and its association with ICC patients’various clinicopathological characteristics was investigated.RESULTS The PSMD6 gene was found to be essential for the growth of ICC cell lines.PSMD6 protein was significantly overexpressed in ICC tissues(P<0.001),but showed no significant association with patient age,gender,pathological grade,or tumor-node-metastasis stage(P>0.05).CONCLUSION PSMD6 can promote the growth of ICC cells,thus playing a pro-oncogenic role.

Is 26S proteasome non-ATPase regulatory subunit 6 a potential molecular target for intrahepatic cholangiocarcinoma?

In this editorial we comment on the article by Tang et al published in the recent issue of World Journal of Hepatology.Drug therapy of intrahepatic cholangiocarcinoma(iCCA)poses an enormous challenge since only a small proportion of patients demonstrate beneficial responses to therapeutic agents.Thus,there has been a sustained search for novel molecular targets for iCCA.The study by Tang et al evaluated the role of 26S proteasome non-ATPase regulatory subunit 6(PSMD6),a 19S regulatory subunit of the proteasome,in human iCCA cells and specimens.The authors employed clustered regularly interspaced short palindromic repeat(CRISPR)knockout screening technology integrated with the computational CERES algorithm,and analyzed the human protein atlas(THPA)database and tissue microarrays.The results show that PSMD6 is a gene essential for the proliferation of 17 iCCA cell lines,and PSMD6 protein was overexpressed in iCCA tissues without a significant correlation with the clinicopathological parameters.The authors conclude that PSMD6 may play a promoting role in iCCA.The major limitations and defects of this study are the lack of detailed information of CRISPR knockout screening,in vivo experiments,and a discussion of plausible mechanistic cues,which,therefore,dampen the significance of the results.Further studies are required to verify PSMD6 as a molecular target for developing novel therapeutics for iCCA.In addition,the editorial article summarizes the latest advances in molecular targeted drugs and recently emerging immunotherapy in the clinical management of iCCA,development of proteasome inhibitors for cancer therapy,and advantages of CRISPR screening technology,computational methods,and THPA database as experimental tools for fighting cancer.We hope that these comments may provide some clues for those engaged in the field of basic and clinical research into iCCA.

F-box only protein 2 exacerbates non-alcoholic fatty liver disease by targeting the hydroxyl CoA dehydrogenase alpha subunit

BACKGROUND Non-alcoholic fatty liver disease(NAFLD)is a major health burden with an increasing global incidence.Unfortunately,the unavailability of knowledge underlying NAFLD pathogenesis inhibits effective preventive and therapeutic measures.AIM To explore the molecular mechanism of NAFLD.METHODS Whole genome sequencing(WGS)analysis was performed on liver tissues from patients with NAFLD(n=6)and patients with normal metabolic conditions(n=6)to identify the target genes.A NAFLD C57BL6/J mouse model induced by 16 wk of high-fat diet feeding and a hepatocyte-specific F-box only protein 2(FBXO2)overexpression mouse model were used for in vivo studies.Plasmid transfection,co-immunoprecipitation-based mass spectrometry assays,and ubiquitination in HepG2 cells and HEK293T cells were used for in vitro studies.RESULTS A total of 30982 genes were detected in WGS analysis,with 649 up-regulated and 178 down-regulated.Expression of FBXO2,an E3 ligase,was upregulated in the liver tissues of patients with NAFLD.Hepatocyte-specific FBXO2 overexpression facilitated NAFLD-associated phenotypes in mice.Overexpression of FBXO2 aggravated odium oleate(OA)-induced lipid accumulation in HepG2 cells,resulting in an abnormal expression of genes related to lipid metabolism,such as fatty acid synthase,peroxisome proliferator-activated receptor alpha,and so on.In contrast,knocking down FBXO2 in HepG2 cells significantly alleviated the OA-induced lipid accumulation and aberrant expression of lipid metabolism genes.The hydroxyl CoA dehydrogenase alpha subunit(HADHA),a protein involved in oxidative stress,was a target of FBXO2-mediated ubiquitination.FBXO2 directly bound to HADHA and facilitated its proteasomal degradation in HepG2 and HEK293T cells.Supplementation with HADHA alleviated lipid accumulation caused by FBXO2 overexpression in HepG2 cells.CONCLUSION FBXO2 exacerbates lipid accumulation by targeting HADHA and is a potential therapeutic target for NAFLD。

Role of brahma-related gene 1/brahma-associated factor subunits in neural stem/progenitor cells and related neural developmental disorders

Different fates of neural stem/progenitor cells(NSPCs)and their progeny are determined by the gene regulatory network,where a chromatin-remodeling complex affects synergy with other regulators.Here,we review recent research progress indicating that the BRG1/BRM-associated factor(BAF)complex plays an important role in NSPCs during neural development and neural developmental disorders.Several studies based on animal models have shown that mutations in the BAF complex may cause abnormal neural differentiation,which can also lead to various diseases in humans.We discussed BAF complex subunits and their main characteristics in NSPCs.With advances in studies of human pluripotent stem cells and the feasibility of driving their differentiation into NSPCs,we can now investigate the role of the BAF complex in regulating the balance between self-renewal and differentiation of NSPCs.Considering recent progress in these research areas,we suggest that three approaches should be used in investigations in the near future.Sequencing of whole human exome and genome-wide association studies suggest that mutations in the subunits of the BAF complex are related to neurodevelopmental disorders.More insight into the mechanism of BAF complex regulation in NSPCs during neural cell fate decisions and neurodevelopment may help in exploiting new methods for clinical applications.

Long non-coding RNA CDKN2B-AS1 promotes hepatocellular carcinoma progression via E2F transcription factor 1/G protein subunit alpha Z axis

BACKGROUND A series of long non-coding RNAs(lncRNAs)have been reported to play a crucial role in cancer biology.Some previous studies report that lncRNA CDKN2B-AS1 is involved in some human malignancies.However,its role in hepatocellular carcinoma(HCC)has not been fully deciphered.AIM To decipher the role of CDKN2B-AS1 in the progression of HCC.METHODS CDKN2B-AS1 expression in HCC was detected by quantitative real-time polymerase chain reaction.The malignant phenotypes of Li-7 and SNU-182 cells were detected by the CCK-8 method,EdU method,and flow cytometry,respectively.RNA immunoprecipitation was executed to confirm the interaction between CDKN2B-AS1 and E2F transcription factor 1(E2F1).Luciferase reporter assay and chromatin immunoprecipitation were performed to verify the binding of E2F1 to the promoter of G protein subunit alpha Z(GNAZ).E2F1 and GNAZ were detected by western blot in HCC cells.RESULTS In HCC tissues,CDKN2B-AS1 was upregulated.Depletion of CDKN2B-AS1 inhibited the proliferation of HCC cells,and the depletion of CDKN2B-AS1 also induced cell cycle arrest and apoptosis.CDKN2B-AS1 could interact with E2F1.Depletion of CDKN2B-AS1 inhibited the binding of E2F1 to the GNAZ promoter region.Overexpression of E2F1 reversed the biological effects of depletion of CDKN2B-AS1 on the malignant behaviors of HCC cells.CONCLUSION CDKN2B-AS1 recruits E2F1 to facilitate GNAZ transcription to promote HCC progression.

引进美国小麦种质资源抗病性及品质性状鉴定

为了挖掘新的种质资源,本研究对引自美国的442份小麦材料对白粉病和条锈病的抗病性、蛋白含量以及高分子量麦谷蛋白(HMW-GS)亚基组成进行了鉴定分析。抗病性鉴定结果显示,153份材料抗白粉病,27份抗条锈病,6份兼抗两种病害。蛋白质含量达到GB/T 17892-1999《优质小麦强筋小麦》一等(粗蛋白质含量≥15.0%)的样品有143份。高分子量麦谷蛋白检测发现,供试材料共含18种HMW-GS亚基和100种不同亚基组合类型,其中N,7+9,5+10出现次数最多,优质亚基1、2*、7^(oe)、17+18、5+10的材料分别占总材料数的25.6%、5.2%、27.8%、7.7%和25.6%,含7^(oe),5+10亚基的有36份,含2*,5+10亚基的有1份,含2*,7^(oe)亚基的有7份。综合抗病性及品质分析结果显示,PI 17738等11份材料至少抗1种病害,且蛋白含量≥15.0%,湿面筋含量≥35.0%,同时含有稀有优质亚基。以上11份材料可作为我国优质、抗病小麦培育亲本,为我国小麦抗病和品质遗传改良提供优异基因源。

7^(OE)+8^(*)亚基对东北强筋小麦品种品质性状影响研究

小麦品质改良是东北春麦区强筋小麦育种的主要目标之一。Glu-B1位点7^(OE)+8^(*)亚基为超强筋小麦品种必备基因。为了明确该亚基在东北春麦区强筋小麦遗传背景下的品质遗传效应,本研究利用分子标记和选择回交相结合的手段,将7^(OE)+8^(*)亚基定向导入到强筋小麦品种龙麦26和龙麦35(Glu-B1位点均为7+9亚基)的遗传背景之中,对BC_(5)F_(1)、BC_(6)F_(1)群体和自交BC6F2鉴定获得的纯合品系进行7^(OE)+8^(*)亚基遗传效应评价。结果表明,在强筋小麦品种龙麦26(7+9)和龙麦35(7+9)遗传背景下转入7^(OE)+8^(*)亚基后,其干面筋、面筋指数、形成时间、稳定时间、断裂时间、拉伸面积、延伸性和最大抗延阻力等品质指标3年平均分别提高1.3%(P=0.82)和1.8%(P=0.49)、6.6%(P=0.59)和4.7%(P=0.37)、55.0%(P=0.24)和35.8%(P=0.56)、44.5%(P=0.43)和32.8%(P=0.73)、41.4%(P=0.31)和30.0%(P=0.66)、28.0%(P=0.05)和23.4%(P=0.37)、6.5%(P=0.47)和5.8%(P=0.42)、19.5%(P=0.31)和18.0%(P=0.38);Zeleny沉降值2年平均分别提高6.8%和11.4%。以上结果表明,在2个强筋小麦品种遗传背景下,Glu-B1位点转入7^(OE)+8^(*)亚基较7+9亚基对各项品质指标改良均存在正向效应,但提高幅度存在差异,对形成时间、稳定时间、断裂时间、最大抗延阻力、拉伸面积等衡量面筋质量的指标提高幅度更大,表明该亚基对面筋质量改良效应显著。综上所述,7^(OE)+8^(*)亚基可作为东北春麦区强筋小麦遗传背景下品质性状进一步改良的优选基因,为超强筋小麦育种的重要基因资源。

鸭短喙侏儒综合征亚单位疫苗安全性及免疫效果评价

旨在评价鸭短喙侏儒综合征(SBDS)亚单位疫苗(rBac-JS01 VP2株)的免疫效果。将40只产蛋母鸭和4只成年公鸭随机分成2组,每组产蛋母鸭20只和成年公鸭2只,试验组母鸭经颈背侧皮下注射疫苗0.5 mL,阴性对照组母鸭经颈背侧皮下注射PBS 0.5 mL。免疫后2、4和6个月,分别收集各组种鸭鸭蛋并人工孵化,每个阶段任意选择1日龄健康的公、母雏鸭各20只进行SBDS-JS01毒株攻毒,记录攻毒后雏鸭体重和发病情况,并在攻毒后第3、5、7、14、21天采集雏鸭肛拭子检测排毒情况,每组随机剖检2只雏鸭,观察组织病理变化,PCR检测各组病毒分布情况;免疫后2、4、6个月,采集产蛋鸭血液并分离血清,收集鸭蛋并提取、纯化卵黄抗体,采用SBDS-JS01株测定病毒中和抗体效价。结果显示:种鸭免疫后2、4、6个月,所孵雏鸭对SBDS-JS01攻毒保护率分别为100%、95%、90%,观察期各时间段内免疫攻毒组与对照组相比,试验鸭的体重无显著性差异(P>0.05),而非免疫攻毒组试验鸭的体重极显著低于其他各组(P<0.01);雏鸭攻毒后,免疫攻毒组在免疫后2个月所孵雏鸭肛拭子检测均呈阴性,观察期内各时间段组织器官病毒分布均低于非免疫攻毒组;疫苗免疫组在免疫后2、4、6个月血清的SBDSJS01中和抗体效价分别为(10.51±1.59)log_(2)、(9.46±1.27)log_(2)、(8.83±1.15)log_(2),卵黄中和抗体效价分别为(10.12±1.46)log_(2)、(9.37±1.06)log_(2)、(8.49±1.21)log_(2);不同时期的血清中和抗体效价和卵黄中和抗体效价基本一致,升降趋势相同,且与被动免疫攻毒保护水平变化具有很好的相关性。提示:制备的SBDS亚单位疫苗安全性高,免疫效果较好,对SBDS病毒可提供持续有效的保护力。

黔豆系列品种贮藏蛋白亚基组成及其含量分析

为明确黔豆系列大豆品种(品系)中大豆球蛋白组分及其各亚基组分含量,以促进营养或加工专用大豆新品种的选育与应用,本研究利用聚丙烯酰胺凝胶电泳(SDS-PAGE)对41份大豆品种(品系)的7S和11S球蛋白亚基组成、相对百分含量和11S/7S比值进行分析。结果表明,各品种间大豆蛋白及其亚基组分相对百分含量存在较大差异;41份供试品种(品系)的7S、11S球蛋白平均相对百分含量分别为26.93%、54.92%,变幅分别为15.58%~43.89%、37.10%~66.48%,变异系数分别为29.36%、13.57%;11S/7S值为0.85~4.05,平均值为2.28,变异系数为38.71%;7S蛋白的变异系数高于11S蛋白,7S蛋白β亚基的变异系数最大,11S蛋白B亚基的变异系数最大,表现出更丰富的遗传多样性;筛选出11S/7S值高于3的品种11份,其中高于4的品种2份;7S与11S球蛋白组分间存在极显著负相关;系统聚类将41份供试品种(品系)聚类为三类,第Ⅰ类群11S蛋白含量和11S/7S平均值最高,第Ⅱ类群A 4、A 1A 2亚基平均含量最高,第Ⅲ类群7S蛋白和A 3亚基的平均含量最高。

稳转hTERT绵羊睾丸细胞系的建立

羊睾丸原代细胞的体外培养是探究牛羊病毒致病机理的重要材料,实际科研工作中常受困于此类细胞传代性差、性质不稳定等缺点。外源性导入人端粒酶逆转录酶基因(hTERT)可以促使端粒酶活性的表达,延长细胞体外培养寿命是一种有效建立细胞永生化的方法。本试验中,通过RT-PCR获得hTERT。利用同源重组的技术,成功的构建了hTERT的真核表达质粒和慢病毒质粒。利用慢病毒表达系统,建立了稳转hTERT绵羊的睾丸细胞系。间接免疫荧光和蛋白免疫印迹试验研究结果均显示,hTERT基因已成功整合进入绵羊睾丸基因组中并稳定表达。第30代次的羊睾丸细胞生长较快,性状较稳定,表明已成功构建了具有永生化特性的绵羊睾丸细胞系,为草食动物病毒的相关研究提供重要的细胞模型。

磷脂酰肌醇-4,5-二磷酸肌醇-3-激酶对原发性肝癌TACE治疗反应的预测作用

目的探讨经导管动脉化疗栓塞术(TACE)治疗的原发性肝癌患者磷脂酰肌醇-4,5-二磷酸肌醇-3-激酶(PIK3CA)的表达及其与TACE治疗反应的相关性。方法从TCGA数据库下载425例肝癌患者PIK3CA的表达量。利用GSE104580数据集内TACE治疗敏感和不敏感患者癌组织PIK3CA表达量,分析两组基因表达差异,绘制ROC曲线分析TACE治疗敏感性与PIK3CA表达的相关性。从GSE14520数据集下载具有完整临床资料、接受TACE治疗的肝细胞癌27例,基于PIK3CA的表达量最佳截断值,分成PIK3CA高表达组和PIK3CA低表达组,比较两组患者的临床资料。应用“survminer”R包进行Kaplan-Meier生存分析。结果肝癌组织PIK3CA表达明显高于癌旁组织;TACE不敏感患者癌组织PIK3CA表达量高于TACE敏感患者,TACE治疗敏感性与PIK3CA表达相关性的ROC曲线下面积(AUC)为0.645;生存分析显示PIK3CA表达量越低,患者生存时间越长,且1、2、3年的AUC分别为0.765、0.713、0.633。结论PIK3CA对于肝细胞癌有一定的诊断价值,有可能作为TACE治疗敏感性的预测指标。

云南蚕区家蚕微孢子虫遗传多样性分析

家蚕微孢子虫(Nosema bombycis)是蚕业生产上一种重要病害——微粒子病的病原体。探讨家蚕微孢子虫种内的遗传多样性,可为云南蚕区家蚕微粒子病的防控提供参考依据。从云南省不同养蚕地区收集了感染微孢子虫的病蚕样品,分离纯化家蚕微孢子虫并提取基因组,克隆SSU rDNA(small subunit ribosomal DNA)和ITS(internal transcribed spacer)序列并进行生物信息学分析。结果发现,云南蚕区Nosema bombycis分离株SSU rDNA序列同源性高达99%以上,遗传距离小于0.006,它们在长度和多个位点存在差异,呈现不同程度的多态性;ITS遗传差异较为显著,序列中存在多碱基的插入或缺失、单碱基的转换和颠换。基于SSU rDNA和rDNA-ITS序列构建系统发生树,结果显示,云南蚕区家蚕微孢子虫分离株系间存在遗传分化,种群间亲缘关系与地理位置无直接联系。研究结果丰富了云南蚕区家蚕微孢子虫的种内遗传多样性。

猪链球菌重组磷酸ABC转运体ATP酶的免疫保护效果评价

猪链球菌(S.suis)是一种重要的人畜共患病原菌,给养猪业造成重大的经济损失。为了评估猪链球菌磷酸ABC转运体ATP酶蛋白的免疫保护效果,本研究构建了猪链球菌磷酸ABC转运体ATP酶原核表达载体进行蛋白的重组表达,纯化并制备该重组蛋白的亚单位疫苗,加强免疫接种后两周,检测其血清抗体效价、免疫保护率、各脏器载菌量以及炎性因子表达情况。结果显示,该蛋白经大肠杆菌表达后主要以可溶形式存在。ELISA检测表明该蛋白可以诱发小鼠产生高水平IgG抗体,免疫组小鼠抗体水平显著高于对照组,该重组蛋白对小鼠感染2型猪链球菌(S.suis serotype 2,S.suis 2)的保护率达到60%,显著降低了小鼠大脑、心脏及肺脏的载菌量,免疫组小鼠细胞因子IL-1β、IFN-γ、IL-6、IL-8和TNF-α的mRNA表达显著上调。研究表明猪链球菌重组磷酸ABC转运体ATP酶蛋白具有较强的免疫原性,是猪链球菌病潜在的亚单位疫苗候选蛋白。

光照条件变化对蓝隐藻色素蛋白复合物表达含量的影响

前期研究发现蓝隐藻(Chroomonas placoidea)藻蓝蛋白PC645存在未报道过的β亚基,但其受光照条件的影响及表达情况不明。实验比较了6组不同光照条件下培养的蓝隐藻对数生长期细胞的色素组成变化及PC645亚基的表达差异。发现光照增加对叶绿素a/c-蛋白复合物影响不明显,但有利于PC645的积累;且影响PC645中两种β亚基的相对表达量,而对α亚基含量影响很小。1级12 h和24 h时β_(2)亚基相对含量最高,较低或过高强度的光照都不利于β_(2)的表达。说明PC645在蓝隐藻光适应机制中可能担负调节作用,β_(2)亚基的存在不仅影响隐藻藻胆蛋白的聚合形式,也与藻细胞的光能传递功能可调性相关。实验结果将为分析新亚基的功能,阐明隐藻特异的光合系统结构与机理提供依据。

Gabra3通过AKT/mTOR途径促进膀胱癌T24细胞侵袭和迁移

目的:探究γ-氨基丁酸受体亚基α-3(Gamma-aminobutyric acid receptor subunit alpha-3,Gabra3)基因对膀胱癌T24细胞凋亡、迁移和侵袭的作用及其机制。方法:TCGA数据库分析Gabra3基因在膀胱癌中的表达以及转移和生存的相关性。建立Gabra3过表达和Gabra3突变的T24细胞株,根据转染质粒不同,分为空白T24细胞(Control)、空pDONR223载体转染T24细胞(NC)、野生型Gabra3过表达T24细胞株(wt-Gabra3)、突变型Gabra3 T24细胞株(mut-Gabra3)。在回补实验中,分为转染突变型Gabra3 T24组(mut-Gabra3)、转染空pDONR223载体mut-Gabra3组(mut-Gabra3-NC)、转染野生型Gabra3过表达组(mut-Gabra3+wt-Gabra3)。用TUNEL染色检测T24细胞凋亡,细胞划痕和Transwell分别检测T24细胞迁移和侵袭,Western blot检测AKT/mTOR通路相关分子生物表达水平。结果:Gabra3基因在膀胱癌中显著高表达(P<0.05),生存曲线证实远处转移存在的患者生存期明显较短(P<0.05)。成功构建Gabra3过表达和突变的T24细胞株。与Control组相比,wt-Gabra3组细胞凋亡能力显著降低,迁移、侵袭能力显著增强(P<0.05),而mut-Gabra3组细胞凋亡显著增加,侵袭能力显著减弱(P<0.05);wt-Gabra3组细胞p-AKT、p-mTOR、p-4E-BP1、p-S6K蛋白表达均显示上凋(P<0.05),而mut-Gabra3组细胞上述蛋白无差异。在回补实验中,过表达wt-Gabra3的mut-Gabra3突变T24细胞凋亡能力受到抑制(P<0.05),迁移和侵袭能力显著增强(P<0.05),并且该组细胞AKT/mTOR通路相关分子显著激活(P<0.05)。结论:外源性的未编辑的Gabra3可以促进膀胱癌T24细胞的迁移、侵袭能力,并且可能与激活AKT/mTOR途径通路密切相关。

X连锁迟发性脊椎骨骺发育不良家系TRAPPC2基因缺失突变的高通量测序分析

目的·研究一个X连锁迟发性脊椎骨骺发育不良(spondyloepiphyseal dysplasia tarda,SEDT)家系的致病基因及突变类型。方法·提取一个SEDT家系6名成员外周血基因组DNA。应用Clearseq遗传性疾病试剂盒靶向捕获先证者基因组样本中与罕见遗传性疾病相关的致病区域,并进行高通量测序,过滤去除高频突变。采用外显子组隐马尔科夫模型(exome hidden Markov model,XHMM)分析拷贝数变异(copy number variant,CNV),并进一步对6名家系成员基因缺失片段的拷贝数进行实时定量PCR分析。结果·高通量测序分析结果显示,先证者X染色体存在2.5 kb缺失(chrX:13732385~13734927),该区域覆盖转运蛋白复合体亚单位2(transport protein particle complex subunit 2,TRAPPC2)基因的第4~6个外显子。定量PCR结果证实先证者及其表哥均存在该缺失,先证者母亲为杂合缺失,先证者父亲、姐姐和表型正常的舅舅拷贝数均正常。结论·TRAPPC2基因第4~6个外显子片段的缺失为SEDT的致病性突变;同时高通量测序分析中运用XHMM算法可检测到致病基因多个外显子的缺失。