Contrary to the adult central nervous system,the peripheral nervous system has an intrinsic ability to regenerate that relies on the expression of regenerationassociated genes,such as some kinesin family members.Kines...Contrary to the adult central nervous system,the peripheral nervous system has an intrinsic ability to regenerate that relies on the expression of regenerationassociated genes,such as some kinesin family members.Kinesins contribute to nerve regeneration through the transport of specific cargo,such as proteins and membrane components,from the cell body towards the axon periphery.We show here that KIF4A,associated with neurodevelopmental disorders and previously believed to be only expressed during development,is also expressed in the adult vertebrate nervous system and up-regulated in injured peripheral nervous system cells.KIF4A is detected both in the cell bodies and regrowing axons of injured neurons,consistent with its function as an axonal transporter of cargoes such asβ1-integrin and L1CAM.Our study further demonstrates that KIF4A levels are greatly increased in Schwann cells from injured distal nerve stumps,particularly at a time when they are reprogrammed into an essential proliferative repair phenotype.Moreover,Kif4a m RNA levels were approximately~6-fold higher in proliferative cultured Schwann cells compared with non-proliferative ones.A hypothesized function for Kif4a in Schwann cell proliferation was further confirmed by Kif4a knockdown,as this significantly reduced Schwann cell proliferation in vitro.Our findings show that KIF4A is expressed in adult vertebrate nervous systems and is up-regulated following peripheral injury.The timing of KIF4A up-regulation,its location during regeneration,and its proliferative role,all suggest a dual role for this protein in neuroregeneration that is worth exploring in the future.展开更多
目的探讨驱动蛋白超家族4A(kinesin family member 4A,KIF4A)在乳腺癌中的表达及与临床病理特征、预后的关系。方法利用GEO数据库的GSE3494公共数据集和TCGA数据库的乳腺癌样本及其临床资料,采用χ2检验进行KIF4A与临床病理特征的相关...目的探讨驱动蛋白超家族4A(kinesin family member 4A,KIF4A)在乳腺癌中的表达及与临床病理特征、预后的关系。方法利用GEO数据库的GSE3494公共数据集和TCGA数据库的乳腺癌样本及其临床资料,采用χ2检验进行KIF4A与临床病理特征的相关性分析,Kaplan-Meier法进行生存分析。通过基因富集分析预测乳腺癌中高表达KIF4A所富集的基因集。结果 KIF4A在不同Elston组织学分级和TNM分期的乳腺癌肿瘤样本中表达差异有统计学意义(P=0.000)。GSE3494和TCGA数据库中KIF4A与ER水平、PR水平均显著相关(P=0.000);与年龄仅TCGA数据库分析结果差异有统计学意义(P=0.000)。此外,GSE3494数据集中,KIF4A与肿瘤大小、淋巴结浸润均显著相关(P=0.000);TCGA数据库中,KIF4A仅与T分期显著相关(P=0.000),与N分期(P=0.081)、M分期(P=0.372)均不相关。KIF4A高表达的乳腺癌患者预后较差,其疾病特异生存期(P=0.001)和总体生存率(P=0.005)均远低于KIF4A低表达患者,且富集了与细胞分裂、细胞周期调控、DNA复制及DNA损伤修复有关的基因集。结论 KIF4A与乳腺癌多个临床病理指标相关,可作为潜在的乳腺癌预后标志物和治疗靶标进一步研究。展开更多
Dear Editor： The demonstration that four transcription factors, Oct4/Sox2/Myc/Klf4, can reprogram fibroblasts into ES-like cells or induced pluripotent stem cells （iPS cells） has generated tremendous interests not...Dear Editor： The demonstration that four transcription factors, Oct4/Sox2/Myc/Klf4, can reprogram fibroblasts into ES-like cells or induced pluripotent stem cells （iPS cells） has generated tremendous interests not only in the field of stem cell biology, but also those related fields such as developmental biology and regenerative medicine [1-5]. The advance has greatly improved the prospects of generating patient specific pluripotent stem cells for therapeutic purposes without therapeutic cloning, an approach with formidable technical as well as ethical challenges. The conceptual breakthrough of the iPS strategy is quite obvious, demonstrating for the first time that the reprogramming of somatic nuclei can be achieved through a rational combination of transcription factors with defined regulatory activities, in contrast to the ill defined reprogramming power of unfertilized eggs. However, the application of the iPS strategy is so far limited to mouse fibroblasts carrying engineered selection markers [3, 4]. The need for selection using drug resistance or marker driven by Nanog-or Oct4-promoters would hamper not only its application in human therapy, but also any at- tempts to popularize this exciting experimental approach to other species such as primates. We reason that cells reprogrammed by Oct4/Sox2/Myc/Klf4 can be identified morphologically among the parental fibroblasts and the acquired pluripotent property should offer a growth advantage over their parental fibroblasts.展开更多
Multidrug resistance （MDR） is the major impediment to cancer chemotherapy. The expression of lung resistance-related protein （LRP）, a non-ATP-binding cassette （ABC） transporter, is high in tumor cells, resulting...Multidrug resistance （MDR） is the major impediment to cancer chemotherapy. The expression of lung resistance-related protein （LRP）, a non-ATP-binding cassette （ABC） transporter, is high in tumor cells, resulting in their resistance to a variety of cytotoxic drugs. However, the function of LRP in tumor drug resistance is not yet explicit. Our previous studies had shown that Kinesin KIF4A was overexpressed in cisplatin （DDP）-resistant human lung adenocarcinoma cells （A549/DDP cells） compared with A549 cells. The expression of KIF4A in A549 or A549/DDP cells significantly affects cisplatin resistance but the detailed mechanisms remain unclear. Here, we performed co-immunoprecipitation experiments to show that the tail domain of KIF4A interacted with the N-terminal of LRP. Immunofluorescence images showed that both the ability of binding to LRP and the motility of KIF4A were essential for the dispersed cytoplasm distribution of LRP. Altogether, our results shed light on a potential mechanism in that motor protein KIF4A promotes drug resistance of lung adenocarcinoma cells through transporting LRP-based vaults along microtubules towards the cell membrane. Thus KIF4A might be a cisplatin resistance-associated protein and serves as a potential target for chemotherapeutic drug resistance in lung cancer.展开更多
基金supported by the Portuguese Foundation for Science and Technology(FCT),Centro 2020 and Portugol2020 and the EU FEDER program,via the project GoBack to SIV(PTDC/CVT-CVT/32261/2017,CENTRO-01-0145-FEDER-032261)the doctoral grants of PDC(SFRH/BD/139974/2018)and BMS(2020.06525.BD and DOI 10.54499/2020.06525.BD)+5 种基金the post-doctoral grant to JPF(SFRH/BPD/113359/2015-program-contract described in paragraphs 4,5,6 of art.23 of Law no.100157/2016,of August 29,as amended by Law no.57/2017 of July 2019),the project PTDC/MED-NEU/1677/2021 to JBRthe Institute of Biomedicine iBiMED(UIDB/04501/2020 and DOI 10.54499/UIDB/04501/2020,UIDP/04501/2020 and DOI 10.54499/UIDP/04501/2020)its LiM Bioimaging Facility-a PPBI node(POCI-01-0145-FEDER-022122)supported by the Research Commission of the Medical Faculty of the Heinrich-Heine-University(HHU)Düsseldorf,of the Biologisch-Medizinisches Forschungszentrum(BMFZ)of HHUfinanced by the Spanish"Plan Nacional de Investigacion Cientifica,Desarrollo e Innovacion Tecnologica,Ministerio de Economia y Competitividad(Instituto de Salud CarlosⅢ)",co-financed by the European Union(FEDER program),(grant FIS P/20/00318 and FIS P23/00337 to VC)grant CPP2021-009070 to VC by the"Proyectos de colaboracion publico-privada,Plan de Investigacion Cientifica,Tecnica y de inovacion 2021-2023,Ministerio de Ciencia e Innovacion,Union Europea,Agencia Estatal de Investigacion,Espana"。
文摘Contrary to the adult central nervous system,the peripheral nervous system has an intrinsic ability to regenerate that relies on the expression of regenerationassociated genes,such as some kinesin family members.Kinesins contribute to nerve regeneration through the transport of specific cargo,such as proteins and membrane components,from the cell body towards the axon periphery.We show here that KIF4A,associated with neurodevelopmental disorders and previously believed to be only expressed during development,is also expressed in the adult vertebrate nervous system and up-regulated in injured peripheral nervous system cells.KIF4A is detected both in the cell bodies and regrowing axons of injured neurons,consistent with its function as an axonal transporter of cargoes such asβ1-integrin and L1CAM.Our study further demonstrates that KIF4A levels are greatly increased in Schwann cells from injured distal nerve stumps,particularly at a time when they are reprogrammed into an essential proliferative repair phenotype.Moreover,Kif4a m RNA levels were approximately~6-fold higher in proliferative cultured Schwann cells compared with non-proliferative ones.A hypothesized function for Kif4a in Schwann cell proliferation was further confirmed by Kif4a knockdown,as this significantly reduced Schwann cell proliferation in vitro.Our findings show that KIF4A is expressed in adult vertebrate nervous systems and is up-regulated following peripheral injury.The timing of KIF4A up-regulation,its location during regeneration,and its proliferative role,all suggest a dual role for this protein in neuroregeneration that is worth exploring in the future.
文摘目的探讨驱动蛋白超家族4A(kinesin family member 4A,KIF4A)在乳腺癌中的表达及与临床病理特征、预后的关系。方法利用GEO数据库的GSE3494公共数据集和TCGA数据库的乳腺癌样本及其临床资料,采用χ2检验进行KIF4A与临床病理特征的相关性分析,Kaplan-Meier法进行生存分析。通过基因富集分析预测乳腺癌中高表达KIF4A所富集的基因集。结果 KIF4A在不同Elston组织学分级和TNM分期的乳腺癌肿瘤样本中表达差异有统计学意义(P=0.000)。GSE3494和TCGA数据库中KIF4A与ER水平、PR水平均显著相关(P=0.000);与年龄仅TCGA数据库分析结果差异有统计学意义(P=0.000)。此外,GSE3494数据集中,KIF4A与肿瘤大小、淋巴结浸润均显著相关(P=0.000);TCGA数据库中,KIF4A仅与T分期显著相关(P=0.000),与N分期(P=0.081)、M分期(P=0.372)均不相关。KIF4A高表达的乳腺癌患者预后较差,其疾病特异生存期(P=0.001)和总体生存率(P=0.005)均远低于KIF4A低表达患者,且富集了与细胞分裂、细胞周期调控、DNA复制及DNA损伤修复有关的基因集。结论 KIF4A与乳腺癌多个临床病理指标相关,可作为潜在的乳腺癌预后标志物和治疗靶标进一步研究。
文摘Dear Editor： The demonstration that four transcription factors, Oct4/Sox2/Myc/Klf4, can reprogram fibroblasts into ES-like cells or induced pluripotent stem cells （iPS cells） has generated tremendous interests not only in the field of stem cell biology, but also those related fields such as developmental biology and regenerative medicine [1-5]. The advance has greatly improved the prospects of generating patient specific pluripotent stem cells for therapeutic purposes without therapeutic cloning, an approach with formidable technical as well as ethical challenges. The conceptual breakthrough of the iPS strategy is quite obvious, demonstrating for the first time that the reprogramming of somatic nuclei can be achieved through a rational combination of transcription factors with defined regulatory activities, in contrast to the ill defined reprogramming power of unfertilized eggs. However, the application of the iPS strategy is so far limited to mouse fibroblasts carrying engineered selection markers [3, 4]. The need for selection using drug resistance or marker driven by Nanog-or Oct4-promoters would hamper not only its application in human therapy, but also any at- tempts to popularize this exciting experimental approach to other species such as primates. We reason that cells reprogrammed by Oct4/Sox2/Myc/Klf4 can be identified morphologically among the parental fibroblasts and the acquired pluripotent property should offer a growth advantage over their parental fibroblasts.
基金Project supported by the National Natural Science Foundation of China(Nos.31271485 and 31301138)the Tianjin Research Program of Application Foundation and Advanced Technology(No.12JC 2DJC21400)+3 种基金the Doctor Foundation of Tianjin Normal University(Nos.52XB1104 and 52XB1005)the Joint Funds of the Xinjiang Uygur Autonomous Region Natural Science Foundation(No.2016 D01C375)the Program for New Century Excellent Talents in University in China(No.NCET-11-1066)the State Key Laboratory of Molecular Oncology(No.SKL-KF-2017-18),China
文摘Multidrug resistance （MDR） is the major impediment to cancer chemotherapy. The expression of lung resistance-related protein （LRP）, a non-ATP-binding cassette （ABC） transporter, is high in tumor cells, resulting in their resistance to a variety of cytotoxic drugs. However, the function of LRP in tumor drug resistance is not yet explicit. Our previous studies had shown that Kinesin KIF4A was overexpressed in cisplatin （DDP）-resistant human lung adenocarcinoma cells （A549/DDP cells） compared with A549 cells. The expression of KIF4A in A549 or A549/DDP cells significantly affects cisplatin resistance but the detailed mechanisms remain unclear. Here, we performed co-immunoprecipitation experiments to show that the tail domain of KIF4A interacted with the N-terminal of LRP. Immunofluorescence images showed that both the ability of binding to LRP and the motility of KIF4A were essential for the dispersed cytoplasm distribution of LRP. Altogether, our results shed light on a potential mechanism in that motor protein KIF4A promotes drug resistance of lung adenocarcinoma cells through transporting LRP-based vaults along microtubules towards the cell membrane. Thus KIF4A might be a cisplatin resistance-associated protein and serves as a potential target for chemotherapeutic drug resistance in lung cancer.
