Sm-like 5 knockdown inhibits proliferation and promotes apoptosis of colon cancer cells by upregulating p53,CDKN1A and TNFRSF10B

BACKGROUND The role of Sm-like 5(LSM5)in colon cancer has not been determined.In this study,we investigated the role of LSM5 in progression of colon cancer and the potential underlying mechanism involved.AIM To determine the role of LSM5 in the progression of colon cancer and the potential underlying mechanism involved.METHODS The Gene Expression Profiling Interactive Analysis database and the Human Protein Atlas website were used for LSM5 expression analysis and prognosis analysis.Real-time quantitative polymerase chain reaction and Western blotting were utilized to detect the expression of mRNAs and proteins.A lentivirus targeting LSM5 was constructed and transfected into colon cancer cells to silence LSM5 expression.Proliferation and apoptosis assays were also conducted to evaluate the growth of the colon cancer cells.Human GeneChip assay and bioinformatics analysis were performed to identify the potential underlying mechanism of LSM5 in colon cancer.RESULTS LSM5 was highly expressed in tumor tissue and colon cancer cells.A high expression level of LSM5 was related to poor prognosis in patients with colon cancer.Knockdown of LSM5 suppressed proliferation and promoted apoptosis in colon cancer cells.Silencing of LSM5 also facilitates the expression of p53,cyclin-dependent kinase inhibitor 1A(CDKN1A)and tumor necrosis factor receptor superfamily 10B(TNFRSF10B).The inhibitory effect of LSM5 knockdown on the growth of colon cancer cells was associated with the upregulation of p53,CDKN1A and TNFRSF10B.CONCLUSION LSM5 knockdown inhibited the proliferation and facilitated the apoptosis of colon cancer cells by upregulating p53,CDKN1A and TNFRSF10B.

Mechanism of stilbene glycosides on apoptosis of SH-SY5Y cells via regulating PI3K/AKT signaling pathway

Objective:To investigate the effects of stilbene glycoside(TSG)on okadaic acid-induced apoptosis in human neuroblastoma cells(SH-SY5Y)via the PI3K/AKT pathway.Methods:The optimal concentration of OA was screened by CCK-8 assay,and SH-SY5Y cells were divided into control group,model group,TSG group,LY294002 group and LY294002+TSG group.The proliferation and apoptosis in each group were detected by CCK-8 and TUNEL assays;Western blotting method and real-time fluorescence quantitative polymerase chain reaction was used to detect the expression of PI3K,P-PI3K(Y607),AKT,P-AKT(Ser473),Bcl-2 and Bax proteins.The relative protein expression was represented by P-PI3K(Y607)/PI3K,P-AKT(Ser473)/AKT and Bcl-2/Bax gray ratio.Results:CCK-8 screened the optimal concentration of OA as 40 nmol/L.Compared with the control group,the model group increased relative cell viability,decreased apoptosis rate,the pathway and apoptotic proteins expression levels of P-PI3K(Y607)/PI3K,P-AKT(Ser473)/AKT and Bcl-2/Bax were decreased,and the mRNA expression levels of PI3K,AKT and Bcl-2 were decreased.Bax mRNA expression level increased(P<0.05);Compared with model group,TSG group increased relative cell viability,decreased apoptosis rate,increased protein expression levels of P-PI3K(Y607)/PI3K,P-AKT(Ser473)/AKT,Bcl-2/Bax,and increased mRNA expression levels of PI3K,AKT,and Bcl-2.Bax mRNA expression decreased(P<0.05),LY294002 group decreased relative cell viability,increased apoptosis rate,P-PI3K(Y607)/PI3K protein expression levels were significantly decreased(P<0.05),P-AKT(Ser473)/AKT and Bcl-2/Bax protein expression levels were significantly decreased,but there was no statistical significance,PI3K,AKT and Bcl-2 mRNA expression levels were decreased,and Bax mRNA expression levels were increased(all P<0.05);Compared with LY294002 group,LY294002+TSG group increased relative cell viability,decreased apoptosis rate,and the protein expression levels of P-PI3K(Y607)/PI3K,P-AKT(Ser473)/AKT and Bcl-2/Bax were increased.The mRNA expression levels of PI3K,AKT,Bcl-2 were increased,Bax was decreased(all P<0.05).Conclusion:Stilbene glycoside may alleviate okadaic acid-induced apoptosis in SH-SY5Y cells by interfering with the PI3K/AKT signaling pathway,which in turn regulates the expression of apoptotic factors such as Bcl-2 and Bax.

不同强度运动预防高脂膳食大鼠心肌脂质沉积效果及对miR-145-5p、KLF5、PPARα表达的影响

目的:观察12周中等强度持续运动(moderate-intensity continuous training,MICT)与高强度间歇运动(high intensity interval training,HIIT)预防高脂膳食大鼠心肌脂质沉积效果的异同,以及对miR-145-5p、KLF5、PPARα表达的影响,从而探讨其可能机制。方法:5周龄雄性SD大鼠随机分为普通膳食安静组(C组)、高脂膳食安静组(F组)、高脂膳食MICT组(M组)、高脂膳食HIIT组(H组),每组8只。12周跑台训练干预结束后,超声心动图检测大鼠心脏结构与功能;光镜和透射电镜观察大鼠心肌脂质沉积;检测大鼠血清、心肌脂质含量;RT-PCR、Western Blot和免疫荧光双标记检测大鼠心肌miR-145-5p、KLF5、PPARα的表达情况。结果:(1)与C组比较,F组大鼠心肌结构、功能受损;心肌纤维松弛,脂质沉积增多;血清及心肌脂质含量增加(P<0.05);心肌组织miR-145-5P表达升高(P<0.05),KLF5、PPARαm RNA与蛋白表达水平降低(P<0.05);KLF5、PPARα阳性细胞数降低(P<0.01)。(2)与F组比较,M、H组大鼠心肌结构、功能均改善;心肌纤维紧密,脂质沉积减少;血清及心肌脂质含量减少(P<0.01);心肌组织miR-145-5P表达降低(P<0.05),KLF5、PPARαm RNA与蛋白表达水平增加(P<0.05);KLF5、PPARα阳性细胞数增加(P<0.01)。(3)与M组比较,H组大鼠心肌脂质沉积减少;血清HDL含量增加(P<0.01),心肌TG含量降低(P<0.05);KLF5、PPARα阳性细胞数增加(P<0.01)。结论:12周MICT与HIIT均能预防高脂膳食大鼠心肌脂质沉积,大鼠心肌miR-145-5p、KLF5、PPARα表达水平的变化可能是运动影响心肌脂质代谢的机制之一,HIIT预防效果较好,可能与该信号通路的活化程度有关。

5-methoxytryptophan induced apoptosis and PI3K/Akt/FoxO3a phosphorylation in colorectal cancer

BACKGROUND Colorectal cancer(CRC)is a highly prevalent malignancy worldwide,and new therapeutic targets urgently need to be found to prolong patient survival.5-methoxytryptophan(5-MTP)is a tryptophan metabolite found in animals and humans.However,the effects of 5-MTP on proliferation and apoptosis of CRC cells are currently unknown.AIM To investigate the effects of 5-MTP on the proliferation,migration,invasion,and apoptosis abilities of CRC cells.Additionally,we seek to explore whether 5-MTP has the potential to be utilized as a drug for the treatment of CRC.METHODS In order to evaluate the effect of 5-MTP on CRC cells,a series of experiments were conducted for evaluation.Colony formation assay and Cell Counting Kit 8 assays were used to investigate the impact of 5-MTP on the proliferation of CRC cell lines.Cell cycle assays were employed to examine the effect of 5-MTP on cellular growth.In addition,we investigated the effects of 5-MTP on apoptosis and reactive oxygen species in HCT-116 cells.To obtain a deeper understanding of how 5-MTP affects CRC,we conducted a study to examine its influence on the PI3K/Akt signaling pathway in CRC cells.RESULTS This article showed that 5-MTP promoted apoptosis and cell cycle arrest and inhibited cell proliferation in CRC cells.In many articles,it has been reported that PI3K/Akt/FoxO3a signaling pathway is one of the most important signaling pathways involved in internal regulating cell proliferation and differentiation. Nevertheless, 5-MTP combined with PI3K/Akt/FoxO3a signaling pathway inhibitors significantly promotedapoptosis and cell cycle arrest and inhibited cell proliferation in CRC cells compared with 5-MTP alone in ourstudy.CONCLUSIONTherefore, there is strong evidence that 5-MTP can be used as an effective medicine for CRC treatment.

血清KLF5含量与阳性淋巴结比例的相关性及其对膀胱癌患者根治术后预后的预测价值

目的:探究血清Kruppel样因子5(recombinant Kruppel factor 5,KLF5)含量与阳性淋巴结比例的相关性及其对膀胱癌患者根治术后预后的预测价值。方法:选取新乡市中心医院和郑州大学第一附属医院泌尿外科2019年6月至2022年9月进行根治性膀胱切除术治疗的92例膀胱癌患者作为研究对象,根据疗效分为有效组和无效组。酶联免疫吸附法检测血清KLF5的表达水平、分析血清KLF5含量与阳性淋巴结比例的相关性和预后的预测价值分析。结果:治疗有效组患者血清KLF5的表达水平显著低于无效组(P<0.05);有效组患者阳性淋巴结比例与无效组相比,具有显著差异(P<0.05);采用Pearson分析血清KLF5与阳性淋巴结比例间关系,发现血清KLF5与阳性淋巴结比例呈正相关(r=0.607);logistic多因素回归分析显示,血清KLF5(OR=2.751,95%CI=1.777~4.260,P=0.000)与阳性淋巴结比例(OR=2.751,95%CI=1.389~7.342,P=0.006)是影响膀胱癌根治术患者病情预后的独立危险因素;ROC结果显示,血清KLF5与阳性淋巴结比例对预测膀胱癌根治术患者预后的曲线下面积(area under the curve,AUC)分别为0.909、0.748,对应灵敏度分别为80.71%、93.26%,特异度分别为91.24%、92.50%。二者联合诊断的AUC为0.929,灵敏度和特异度分别为92.30%和92.50%。结论:血清KLF5和阳性淋巴结比例是膀胱根治术患者预后的独立危险因素,并且KLF5与患者的阳性淋巴结比例呈正相关,因此在预测膀胱根治术患者预后的过程中,动态检测相关影响因素的变化可以为临床医生诊断病情提供依据。

circROBO1上调KLF5促进视网膜细胞瘤侵袭的机制研究

目的:探索circROBO1通过上调KLF5促进视网膜Y79细胞侵袭的作用及其可能的调控机制。方法:RNase R酶消化及qRT-PCR实验检测环状RNA circROBO1在视网膜Y79细胞中的结构稳定性;分别提取视网膜Y79细胞的胞质及胞核RNA,进行circROBO1的亚细胞定位分析;采用siRNA沉默视网膜Y79细胞中circROBO1的表达,划痕实验、Transwell细胞侵袭与迁移实验检测circROBO1对Y79细胞迁移与侵袭能力的影响;通过CircInteractome及TargetScan在线软件分别预测circROBO1与下游miRNA及miRNA与下游靶基因KLF5的靶向结合位点,并采用双荧光素酶报告基因实验验证两者之间的靶向调控关系。蛋白免疫印迹实验检测siRNA沉默Y79细胞中circROBO1的表达后对KLF5表达的影响。结果:与未经RNase R酶处理的对照组相比,circROBO1的相对表达量在RNase R酶处理后并无显著变化;而线性ROBO1的相对表达量在经RNase R酶处理后,则显著降低(t=16.18,P<0.05);circROBO1在细胞质中的含量显著高于细胞核(t=13.04, P<0.05);与转染si-control的对照组相比,si-circROBO1组视网膜Y79细胞的迁移率、Transwell细胞侵袭与迁移能力均显著降低(t=22.54,P<0.05);circROBO1可靶向吸附miR-885-5p、miR-885-5p与KLF5之间存在靶向结合位点(t=11.39,P<0.05);与si-control组相比,si-circROBO1组的KLF5蛋白表达显著降低(t=17.26,P<0.05)。结论:circROBO1通过上调KLF5促进视网膜Y79细胞瘤侵袭。

甲状腺乳头癌组织中KLF5、TAZ、UHRF1的表达水平及其临床意义

目的探讨甲状腺乳头癌组织中KLF5、TAZ、UHRF1的表达水平及其临床意义。方法选取甲状腺乳头癌患者150例,所有研究对象均同意术中留取病灶组织标本以及配对的癌旁组织标本。观察甲状腺乳头癌组织中KLF5、TAZ、UHRF1的表达及与甲状腺乳头癌临床病理参数的关系以及KLF5、TAZ、UHRF1表达间的相关性。结果甲状腺乳头状癌组织中KLF5、TAZ、UHRF1蛋白阳性表达率(75.33%、70.00%、64.00%)均高于癌旁组织,差异均具有统计学意义(P<0.05)。KLF5、TAZ、UHRF1表达与肿瘤临床分期、肿块大小、淋巴结转移和甲状腺外侵犯相关(P<0.05),与患者年龄、性别及有无多灶性无关(P>0.05)。KLF5蛋白表达分别与TAZ、UHRF1蛋白表达呈正相关(γ=0.594,0.491,P均<0.05),TAZ蛋白表达与UHRF1蛋白表达呈正相关(γ=0.486,P<0.05)。结论甲状腺乳头癌组织中KLF5、TAZ、UHRF1的表达均上调,均与临床分期、肿块大小、淋巴结转移、甲状腺外侵犯有关。

CircROBO1 promotes retinal Y79 cell tumor invasion by targeting KLF5

Objective:To explore the role of circROBO1 in promoting the invasion of retinal Y79 cells by targeting KLF5 and its possible regulatory mechanism.Methods:RNase R enzyme digestion and qRT-PCR experiments were used to detect the structural stability of circular circROBO1 in retinal Y79 cells;cytoplasmic and nuclear RNAs of retinal Y79 cells were extracted for localization analysis of circROBO1;The expression of circROBO1 in retinal Y79 cells were silenced by siRNA.The effect of circROBO1 on the migration and invasion ability of HT-29 cells was detected by scratch assay,Transwell cell invasion and migration assay.The target binding sites of circROBO1 and its downstream miRNA and that of miRNA and its downstream target gene KLF5 were predicted by CircInteractome and TargetScan online software respectively,and the target regulation relationship between them was verified by double luciferase reporter gene experiment.Western blot was used to detect the effect of siRNA silencing the expression of circROBO1 in Y79 cells on the expression of KLF5.Results:Compared with the control group without RNase R enzyme treatment,relative circROBO1 levels did not change significantly after treatment,while relative linear ROBO1 levels decreased significantly after treatment(t=16.18,P<0.05);the content of circROBO1 in the cytoplasm was significantly higher than that in the nucleus(P<0.05);compared with si-control group,the migration rate and the invasion and migration abilities of Transwell cells were all lower in the si-circROBO1 group(t=22.54,P<0.05);circROBO1 can adsorb miR-885-5p,and there is a target binding site between miR-885-5p and KLF5(t=11.39,P<0.05);compared with the si-control group,the KLF5 protein expression in the si-circROBO1 group was significantly decreased(t=17.26,P<0.05).Conclusions:circROBO1 promotes retinalY79 cell tumor invasion by targeting KLF5.

Selenium nanoparticles reduce oxidative stress-induced cardiomyocyte apoptosis in ascites syndrome in broiler chickens via the ATF6-DR5 signaling pathway

Broiler ascites syndrome(AS)is one of the main diseases threatening the health of broilers.It is well documented that myocardial hypertrophy and failure is one of the key mechanisms of broiler ascites syndrome.Therefore,prevention of cardiac hypertrophy and failure would be one goal to reduce broiler ascites syndrome incidence.Myocardial hyper-trophy and failure are closely related to endoplasmic reticulum stress(ERS)in cardiac myocytes,and the endoplasmic reticulum stress signaling system(ATF6-DR5)is one of the important pathways of myocardial apoptosis.Excessive hyper-trophy will affect the heart muscle's normal contraction and diastole function,and the heart will turn from compen-sated to decompensate thus causing myocardial injury.Myocardial apoptosis is a core component of the pathological changes of this myocardial injury.Nano-selenium is a kind of red elemental selenium nanoparticle.Due to its excellent physical,chemical and biological properties,it has attracted extensive academic attention in recent years.It has been proven to have excellent antioxidant,antibacterial,antitumor,antihypertrophic,and antiapoptotic abilties.Herein,nano-selenium(1μmol/L)can inhibit hydrogen peroxide(H_(2)O_(2))-induced oxidative stress in broiler primary cardiomyocytes,and at the same time reduce cardiomyocyte apoptosis.In vivo,nano-selenium can reduce broiler myocardial injury-related enzyme indicators(AST,CK and LDH),and alleviate myocardial injury.It can also activate the antioxidant enzyme system(SOD,GSH-Px and CAT)and reduce MDA,and make the recovery ofT-AOC ability in the organization.Meanwhile,nano-selenium can down-regulate the genes and proteins expression of ATF-6,GRP-78,CHOP and caspase 12 in the ERS-related signaling pathway,and inhibit that of downstream-related caspase 3,Bax and caspase 9,and increase that of the downstream anti-apoptotic Bcl-2,thereby maintaining the homeostasis of the endoplasmic reticulum and alleviating cardiomyocyte apoptosis.It can be seen that nano-selenium can protect the damaged myocardium in the broiler ascites caused by high-salt drinking by regulating the ATF6-DR5 signaling pathway.This study was performed in chickens and cardiomyocyte cells and attempted to demonstrate that selenium nanoparticles can protect the damaged myocar-dium in broiler ascites.This paper provides a new idea for preventing and treating broiler ascites syndrome.

The effect of miR-129-5p in pancreatic cancer cells on apoptosis through targeted of HMGB1

Objective:To investigate the role of miR-129-5p in regulating HMGB1 expression in pancreatic cancer cell apoptosis.Methods:The untreated pancreatic cancer SW1990 cells were used as the control group.Mimics-NC(empty vector),miR-129-5p mimics,inhibitor-NC(empty vector)and miR-129-5p inhibitor were transfected into SW1990 cells by liposome transfection method as the mimics-NC group,miR-129-5p overexpression group(miR-129-5p mimics group),inhibitor-NC group and miR-129-5p low expression group(miR-129-5p inhibitor group).The binding site of miR-129-5p and HMGB1 was predicted by online target gene prediction website Target genes,and the targeting relationship between miR-129-5p and HMGB1 was verified by dual luciferase gene report experiment.The expression of miR-129-5p in each group was detected by qRT-PCR,and the expression of HMGB1 protein and apoptosis-related proteins Caspase 3 and Bcl-2 by Western blot.Hoechst staining was used to observe the changes of apoptosis.Results:Compared with the mimics-NC group and control group,miR-129-5p mimics transfection significantly up-regulated miR-129-5p level(P<0.01),inhibited HMGB1(P<0.01)and Bcl-2(P<0.05)protein expression,pro-moted Caspase 3 protein expression(P<0.05),and promoted apoptosis;compared with the inhibitor-NC group and control group,miR-129-5p inhibitor transfection significantly down-regulated miR-129-5p level(P<0.05),promoted HMGB1 and Bcl-2 protein expression(all P<0.05),inhibited Caspase 3protein expression(P<0.01),and inhibited apoptosis.The results of dual luciferase reporter gene assay showed that miR-129-5p could inhibit the fluorescence activity of wildtype HMGB1 cells and target the expression of HMGB1.Conclusion:miR-129-5p promotes the apoptosis of pancreatic cancer SW1990 cells by targeting inhibition of HMGB1 expression.

KLF4和KLF5蛋白在不同临床分期胃癌组织中的表达及意义

背景与目的:胃癌的发生、发展及生物学行为受到多个分子信号通路的影响,转录因子是调控这些分子通路的重要因素。而转录因子KLF4(Krüppel-like factors 4)、KLF5(Krüppel-like factors 5)与胃癌相关性的报道比较罕见。因此探讨转录因子KLF4、KLF5对胃癌生物学行为影响的分子机制具有重要的意义。方法:收集158例手术切除的胃溃疡型腺癌组织标本,同时取78例癌旁组织作为对照。应用免疫组织化学SP法检测胃腺癌组织、癌旁组织中转录因子KLF4和KLF5蛋白的表达。结果:158例胃腺癌组织中KLF4的阳性表达率为40.50%,KLF5的阳性表达率为63.93%,KLF4和KLF5的表达与患者性别、年龄及肿瘤位置之间无显著相关性(P>0.05),与肿瘤有无淋巴转移及WHO临床分期之间有显著相关性(P<0.05)。随着临床分期等级的增加,KLF4表达呈现递减趋势,而KLF5表达呈现增加趋势,其表达率与肿瘤临床分期程度显著相关(P<0.05)。结论:胃癌组织中KLF4的低表达和KLF5蛋白高表达可能是胃黏膜恶性转变以及胃癌发生浸润转移的重要生物学标志,检测KLF4和KLF5对预测胃癌浸润转移有重要意义。

KLF5沉默通过抑制NF-κB信号通路减少氧化应激条件下心肌细胞炎症因子分泌

目的研究沉默Krüpple样因子5(KLF5)对氧化应激条件下心肌细胞炎症因子分泌的影响及机制。方法心肌H9c2细胞用过氧化氢处理,qRT-PCR和Western blot检测细胞中KLF5 mRNA和蛋白表达水平。用KLF5 shRNA慢病毒感染H9c2细胞,给予过氧化氢处理后,qRT-PCR和Western blot检测细胞中KLF5表达水平。MTT检测沉默KLF5对过氧化氢处理的心肌细胞活性的影响,同时用qRT-PCR法检测肿瘤坏死因子-α(TNF-α)、白细胞介素-1β(IL-1β)mRNA水平,Western blot检测细胞中核因子-κBp65(NF-κBp65)蛋白水平。用NF-κB激活剂处理沉默KLF5的心肌细胞,MTT检测其在过氧化氢处理后细胞活性,qRT-PCR法检测过氧化氢处理后细胞中TNF-α、IL-1β水平。结果过氧化氢诱导H9c2细胞中KLF5 mRNA和蛋白表达。KLF5 shRNA慢病毒感染可下调氧化应激条件下H9c2细胞中KLF5的表达。过氧化氢能够下调H9c2细胞活性,提高细胞分泌的TNF-α、IL-1β水平,促进细胞中NF-κBp65蛋白表达。沉默KLF5能够提高过氧化氢条件下H9c2细胞经活性,减少细胞分泌TNF-α、IL-1β,抑制细胞中NF-κBp65蛋白表达。NF-κB激活剂可以逆转沉默KLF5对过氧化氢处理的心肌细胞增殖活性、炎症因子分泌的影响。结论氧化应激诱导心肌细胞表达KLF5,沉默其表达可以通过抑制NF-κB通路减少心肌细胞中炎症因子表达。

TAZ和KLF5在肝细胞癌组织中的表达及其临床意义

目的:检测TAZ和KLF5在肝细胞癌(HCC)及对应癌旁组织中的表达情况,分析两者的临床意义。方法:收集76例HCC及对应癌旁组织,运用免疫组化技术检测TAZ及KLF5的表达情况,分析两者与HCC临床病理特征之间的相关性。结果:TAZ及KLF5蛋白在HCC组织中的表达显著高于对应癌旁组织(P=0.001;P=0.035);TAZ及KLF5蛋白表达与肿瘤病理分级(P=0.007;P=0.047)和TNM分期(P=0.009;P=0.040)显著相关;HCC组织中TAZ与KLF5蛋白表达显著正相关(r=0.651,P=0.003)。结论:HCC组织中TAZ及KLF5过表达与恶性临床病理参数相关,且TAZ与KLF5蛋白表达正相关,提示TAZ可能通过抑制KLF5蛋白降解促进HCC进展。

KLF5和Survivin蛋白异常表达与胃癌预后的关系

目的通过分析KLF5和Survivin蛋白在胃癌组织中的表达,探讨KLF5和Survivin在胃癌发生、发展中的相互关系及二者对胃癌预后的影响。方法采用免疫组化SP法检测79例胃癌组织和40例正常胃组织中KLF5和Survivin的表达,并根据检测结果进行相关性分析、Kaplan-Meier法进行生存分析、通过Cox比例风险模型分析KLF5和Survivin的表达与患者预后的关系。结果 79例胃癌组织中KLF5和Survivin的阳性率分别为46.84%和56.96%,二者表达均与肿瘤分化程度、临床分期、浸润程度及有无淋巴结转移显著相关(P<0.05)。经Spearman等级相关分析显示,KLF5和Survivin在胃癌组织中的表达呈正相关(r_s=0.444,P<0.05)。Kaplan-Meier法生存分析显示,KLF5和Survivin阳性组的中位生存期(28个月和29个月)明显低于阴性组(48.5个月和50.6个月)(P<0.000 1)。Cox回归分析表明,肿瘤浸润深度、临床分期、淋巴结转移以及KLF5和Survivin异常表达是影响胃癌患者预后的危险因素。结论 KLF5和Survivin高表达与胃癌分化程度、浸润和转移有关,并且二者间可能存在相互调节和协同效应,是胃癌不良预后的危险因素,可作为胃癌诊断及预后评价的客观指标。

BCL6、KLF5、NCL基因在儿童急性淋巴细胞白血病中异常表达的特点

目的:研究转录因子基因BCL6、KLF5及核仁蛋白基因NCL在急性淋巴细胞白血病(acute lymphoblastic leukemia,ALL)患儿骨髓细胞中的表达情况及其在不同疾病状态下的表达特点。方法:选取北京儿童医院2004年1月至2005年12月住院ALL患儿100例,另取由于骨骼畸形而在北京儿童医院进行外科手术的5例非ALL患儿作对照;以基因芯片检测ALL患儿骨髓细胞中异常表达基因,GeXP多重基因表达分析系统检测BCL6、KLF5、NCL基因在另外选取的10例配对ALL患儿初诊及缓解期的表达变化。结果:基因芯片筛查发现,在100例各亚型ALL标本中,BCL6和KLF5mRNA表达均下调,NCLmRNA表达均上调。BCL6和KLF5mRNA在10例ALL初诊患儿骨髓细胞中表达较低,完全缓解后表达升高(0.380±0.16vs0.850±0.10,0.074±0.021vs0.228±0.049;均P<0.01);NCLmRNA在ALL初诊患儿骨髓细胞中表达较高,完全缓解后表达降低(0.234±0.054vs0.151±0.055,P<0.01)。在10例配对患者儿中,TEL-AML1阳性及E2A-PBX1阳性组患儿的初诊及缓解期骨髓细胞中,该3个基因在两组中的表达变化趋势一致。结论:ALL患儿骨髓细胞中BCL6、KLF5基因在初诊时表达下调、在临床缓解后表达上调,NCL基因初诊时上调、临床缓解后下调;该3个基因似可作为白血病的分子标志物及效疗的监测指标。

周期性牵张应力作用下KLF5对人牙周膜细胞增殖和成骨分化的影响

目的 :探讨周期性牵张应力(cyclic tensile stress,CTS)作用下Kruppel样转录因子5(Kruppel-like factor 5,KLF5)在人牙周膜细胞(human periodontal ligament cells,h PDLCs)中的表达及其对h PDLCs增殖和成骨分化的影响。方法:酶解组织块法体外培养h PDLCs,对其施加形变率10%,频率0.5 Hz的周期性牵张应力1、4、8、12、24 h,采用RT-PCR和Western印迹法检测细胞中KLF5 m RNA和蛋白的表达。转染si RNA(si-KLF5)至h PDLCs沉默KLF5表达,RT-PCR检测KLF5 m RNA的表达。同时,将过表达碱性成纤维细胞生长因子(basic fibroblast growth factor,b FGF、FGF2)的pc DNA3.1-FGF2转染至稳定转染si-KLF5的h PDLCs,加力8 h后,以CCK8法检测各组细胞的增殖活性,碱性磷酸酶(alkaline phosphatase,ALP)试剂盒检测ALP活性,RT-PCR检测成骨分化因子Runx2和Osterix的m RNA表达,Western印迹法检测Runx2、Osterix、FGF2、GSK-3β、P-GSK-3β(ser 9)、β-catenin蛋白的表达。采用SPSS22.0软件包对数据进行统计学分析。结果 :10%CTS刺激呈时间依赖性地诱导h PDLCs中KLF5 m RNA和蛋白表达。si-KLF5转染可显著抑制10%CTS诱导的h PDLCs的增殖,降低其ALP活性,减少Runx2和Osterix的m RNA和蛋白表达,并抑制FGF2-GSK-3β/β-catenin信号通路的激活;而过表达FGF2可以部分逆转沉默KLF5对h PDLCs增殖和成骨分化的抑制效应。结论 :周期性牵张应力作用下,KLF5通过FGF2-GSK-3β//β-catenin信号通路影响人牙周膜细胞的增殖和成骨分化。

结肠癌中KLF5表达与Cyclin D1和PCNA及P53的关系及意义

目的通过检测转录因子KLF5蛋白和细胞周期素D1(Cyclin D1)、增殖细胞核抗原(PCNA)、P53蛋白在结肠癌组织中的表达,对KLF5在结肠癌细胞增殖过程中的意义进行探讨。方法对48例结肠癌和30例癌旁组织石蜡标本进行免疫组化染色,检测KLF5与Cyclin D1、PCNA、P53在两种组织中的表达情况,并分析其关系。结果结肠癌组织中KLF5、Cyclin D1、PCNA表达均强于癌旁组织(均P<0.05),P53在两种组织中表达无明显差异(P>0.05)。相关分析显示,结肠癌组织中KLF5与Cyclin D1之间、KLF5与P53之间表达存在正相关关系(P均<0.05);Cyclin D1与PCNA表达也存在正相关关系(P<0.05),Cyclin D1与P53、PCNA与P53之间表达均无明显相关关系(P>0.05)。结论结肠癌组织中KLF5表达上调,这与KLF5可能通过调节CyclinD1、P53表达而参与结肠癌细胞增殖有关。

EGCG Enhances TRAIL-mediated Apoptosis in Human Melanoma A375 Cell Line

Tumor necrosis factor-related apoptosis-inducing ligand （TRAIL） is a promising anti-cancer agent. Epigallocatechin-3-gallate （EGCG） is a polyphenolic constituent of green tea. In this study, inhibitory effect of combined use of EGCG and TRAIL on human melanoma A375 cells was examined and the possible mechanism investigated. The cells were divided into 4 groups： control group, EGCG group （EGCG： 10, 20 μg/mL）, TRAIL group （TRAIL： 25 ng/mL） and EGCG＋TRAIL group （combined group）. The growth inhibition was measured in the A375 cells treated with different concentrations of TRAIL （（25, 50, 75, 100, 125, 150 ng/mL） by MTT assay. The apoptosis was assessed by flow cytometry. The expressions of DR4 and DR5 were detected by flow cytometry and western blotting. The activities of caspase-8 and caspase-3 were determined by colorimetric assay. The results showed that TRAIL could dose-dependently inhibit the growth of A375 cells and the IC50 of TRAIL was 150 ng/mL. The apoptosis rate was 11.8% in the TRAIL group, 5%–7% in the EGCG group and 48.9%–59.1% in the combined group. Significant difference was found in the apoptosis rate between the combined group and the EGCG or TRAIL group （P〈0.05 for each）. The expression of DR4 instead of DR5 was significantly increased in the EGCG group. The activity of caspase-3 rather than caspase-8 was substantially enhanced in the EGCG group. These results suggest that EGCG is useful for the TRAIL-based treatment for melanoma.

FBXW7与KLF5在乳腺癌中的表达及临床意义

目的:研究FBXW7与KLF5在乳腺癌病变组织中的表达程度及两个因子同临床相应病理学特征之间的联系以及两者内在联系,并阐明其在人类乳腺癌形成过程中的作用机制。方法:选取经佳木斯大学附属第一医院确诊为乳腺癌并行手术治疗的患者病理蜡块,且再次由资深病理科医生证实,通过采用Elivision TM Plus/HRP免疫组化方法,分别检测45例乳腺癌组织标本中FBXW7和KLF5两个与癌症相关基因的表达状况,同时在应用软件SPSS17.0的帮助下,采用传统的统计学计算方法分析上述两因子同临床相应的病理学特点间的关系,最后探讨FBXW7和KLF5是否存在相关的临床指导意义。结果:乳腺癌中KLF5阳性表达率为82.22%,高于正常乳腺的17.78%;乳腺癌中FBXW7蛋白阳性表达为53.33%,低于正常乳腺中的100.00%;二组间差异均具有统计学意义(P<0.05)。结论:KLF5在乳腺癌中表达明显增强,FBXW7在乳腺癌中表达明显降低,提示在乳腺癌发生中KLF5和FBXW7发挥一定作用,对KLF5、FBXW7的检测可作为重要生物学指标。

TRAIL-induced apoptosis of hepatocellular carcinoma cells is augmented by targeted therapies

AIM:To analyze the effect of chemotherapeutic drugs and specific kinase inhibitors,in combination with the death receptor ligand tumor necrosis factor-related apoptosis inducing ligand(TRAIL),on overcoming TRAIL resistance in hepatocellular carcinoma(HCC)and to study the efficacy of agonistic TRAIL antibodies,as well as the commitment of antiapoptotic BCL-2 proteins, in TRAIL-induced apoptosis. METHODS:Surface expression of TRAIL receptors (TRAIL-R1-4)and expression levels of the antiapoptotic BCL-2 proteins MCL-1 and BCL-xL were analyzed by flow cytometry and Western blotting,respectively. Knock-down of MCL-1 and BCL-xL was performed by transfecting specific small interfering RNAs.HCC cellswere treated with kinase inhibitors and chemotherapeutic drugs.Apoptosis induction and cell viability were analyzed via flow cytometry and 3-(4,5-Dimethyl-thiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. RESULTS:TRAIL-R1 and-R2 were profoundly expressed on the HCC cell lines Huh7 and Hep-G2. However,treatment of Huh7 and Hep-G2 with TRAIL and agonistic antibodies only induced minor apoptosis rates.Apoptosis resistance towards TRAIL could be considerably reduced by adding the chemotherapeutic drugs 5-fluorouracil and doxorubicin as well as the kinase inhibitors LY294002[inhibition of phosphoinositol- 3-kinase(PI3K)],AG1478(epidermal growth factor receptor kinase),PD98059(MEK1),rapamycin(mam- malian target of rapamycin)and the multi-kinase inhibitor Sorafenib.Furthermore,the antiapoptotic BCL-2 proteins MCL-1 and BCL-xL play a major role in TRAIL resistance:knock-down by RNA interference increased TRAIL-induced apoptosis of HCC cells.Additionally, knock-down of MCL-1 and BCL-xL led to a significant sensitization of HCC cells towards inhibition of both c-Jun N-terminal kinase and PI3K.CONCLUSION:Our data identify the blockage of survival kinases,combination with chemotherapeutic drugs and targeting of antiapoptotic BCL-2 proteins as promising ways to overcome TRAIL resistance in HCC.