Similar to that of other enteroviruses, the replication of enterovirus 71(EV71) occurs on rearranged membranous structures called replication organelles(ROs). Phosphatidylinositol 4-kinase Ⅲ(PI4KB), which is required...Similar to that of other enteroviruses, the replication of enterovirus 71(EV71) occurs on rearranged membranous structures called replication organelles(ROs). Phosphatidylinositol 4-kinase Ⅲ(PI4KB), which is required by enteroviruses for RO formation, yields phosphatidylinositol-4-phosphate(PI4P) on ROs. PI4P then binds and induces conformational changes in the RNA-dependent RNA polymerase(Rd Rp) to modulate Rd Rp activity. Here, we targeted 3D polymerase, the core enzyme of EV71 ROs, and found that the host factor Annexin A2(ANXA2) can interact with 3 D polymerase and promote the replication of EV71. Then, an experiment showed that the annexin domain of ANXA2, which possesses membranebinding capacity, mediates the interaction of ANXA2 with EV71 3 D polymerase. Further research showed that ANXA2 is localized on ROs and interacts with PI4KB. Overexpression of ANXA2 stimulated the formation of PI4P, and the level of PI4P was decreased in ANXA2-knockout cells. Furthermore, ANXA2, PI4KB, and 3D were shown to be localized to the viral RNA replication site, where they form a higher-order protein complex, and the presence of ANXA2 promoted the PI4 KB-3D interaction. Altogether, our data provide new insight into the role of ANXA2 in facilitating formation of the EV71 RNA replication complex.展开更多
目的探究负载膜联蛋白A2(ANXA2)的骨髓间充质干细胞(BMSC)来源的外泌体(Exo-ANXA2)对前列腺癌细胞增殖、侵袭与迁移以及前列腺癌移植瘤生长的影响,并研究巨噬细胞是否参与该过程。方法分离与培养BALB/c裸鼠BMSC,采用负载ANXA2的慢病毒...目的探究负载膜联蛋白A2(ANXA2)的骨髓间充质干细胞(BMSC)来源的外泌体(Exo-ANXA2)对前列腺癌细胞增殖、侵袭与迁移以及前列腺癌移植瘤生长的影响,并研究巨噬细胞是否参与该过程。方法分离与培养BALB/c裸鼠BMSC,采用负载ANXA2的慢病毒质粒感染BMSC,并分离外泌体;加入外泌体处理THP-1巨噬细胞,ELISA检测细胞上清培养液肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)、IL-6和IL-10的水平;将外泌体处理的巨噬细胞与前列腺癌细胞共培养后,CCK-8法检测细胞增殖活性,Transwell^(TM)小室检测细胞侵袭与迁移。通过注射PC-3人前列腺癌细胞构建前列腺癌裸鼠移植瘤模型,将建模后的裸鼠随机分为对照组和实验组,每组8只,实验组裸鼠尾静脉注射1 mL Exo-ANXA2,对照组注射等量PBS,于注射后第0、3、6、9、12、15、18、21天,使用游标卡尺测量计算肿瘤体积,21 d处死裸鼠并测量肿瘤组织质量,免疫组织化学染色法检测肿瘤组织中抗原KI-67(ki67)和CD163表达。结果骨髓分离的细胞表面CD90和CD44呈高表达,CD34和CD45呈低表达,且成骨成脂分化能力较强,成功获得BMSC;负载ANXA2的慢病毒质粒感染后,BMSC中有较强的绿色荧光蛋白表达,并成功分离到Exo-ANXA2;经Exo-ANXA2处理后,THP-1细胞中TNF-α和IL-6的水平显著升高而IL-10和IL-13的水平显著下降;Exo-ANXA2处理巨噬细胞后,显著抑制Exo-ANXA2促进PC-3细胞增殖活性、侵袭与迁移的作用;经过给予前列腺癌移植瘤裸鼠注射Exo-ANXA2后,裸鼠在第6、9、12、15、18、21天的肿瘤组织体积显著减小,21 d时裸鼠肿瘤体质量也显著减少,此外,肿瘤组织内ki67和CD163的阳性表达率均显著降低。结论Exo-ANXA2能够抑制前列腺癌细胞增殖、侵袭与迁移,并抑制裸鼠前列腺癌移植瘤生长,M2型巨噬细胞减少。展开更多
ANXA2（AnnexinA2）, a calcium-dependent phospholipid bind- ing protein, is involved in various Ca2＋-related biological activities. In the present study, full-length cDNA of ANXA2 was isolated from the velvet antler t...ANXA2（AnnexinA2）, a calcium-dependent phospholipid bind- ing protein, is involved in various Ca2＋-related biological activities. In the present study, full-length cDNA of ANXA2 was isolated from the velvet antler tip tissue of sika deer （Cervus nippon hortulomm）; the amino acid sequence and gene expression was analyzed by using bioinformatics and real-time reverse transcdptase polymerase chain reaction （RT-PCR） techniques. Nucleotide sequence analysis reveals that the full-length cDNA of the ANXA2 gene was 1372 bp, of which 1020 bp was in the opan-reading frame （OR.F） encoding 339 amino acids; its relative mo- lecular weight was 38.3 kDa; and isoelectrie point was 6.72. Sequence analysis indicates that the protein includes four conserved tan- dem-duplication ANX domains. The gene-aceession nucleotide sequence number in GenBank is JX315571. Expression analysis by RT-PCR re- veals that ANXA2 gene expression has a significant positive correlation with the antler-tissue mineralization process, indicating that this gene may play an important role in the regulation of antler-tissue mineraliza- tion.展开更多
基金This study was supported by the National Science Foundation of China(81971976,81772236)Major Project of Technology Innovation Program of Hubei Province(2018ACA123)。
文摘Similar to that of other enteroviruses, the replication of enterovirus 71(EV71) occurs on rearranged membranous structures called replication organelles(ROs). Phosphatidylinositol 4-kinase Ⅲ(PI4KB), which is required by enteroviruses for RO formation, yields phosphatidylinositol-4-phosphate(PI4P) on ROs. PI4P then binds and induces conformational changes in the RNA-dependent RNA polymerase(Rd Rp) to modulate Rd Rp activity. Here, we targeted 3D polymerase, the core enzyme of EV71 ROs, and found that the host factor Annexin A2(ANXA2) can interact with 3 D polymerase and promote the replication of EV71. Then, an experiment showed that the annexin domain of ANXA2, which possesses membranebinding capacity, mediates the interaction of ANXA2 with EV71 3 D polymerase. Further research showed that ANXA2 is localized on ROs and interacts with PI4KB. Overexpression of ANXA2 stimulated the formation of PI4P, and the level of PI4P was decreased in ANXA2-knockout cells. Furthermore, ANXA2, PI4KB, and 3D were shown to be localized to the viral RNA replication site, where they form a higher-order protein complex, and the presence of ANXA2 promoted the PI4 KB-3D interaction. Altogether, our data provide new insight into the role of ANXA2 in facilitating formation of the EV71 RNA replication complex.
文摘目的探究负载膜联蛋白A2(ANXA2)的骨髓间充质干细胞(BMSC)来源的外泌体(Exo-ANXA2)对前列腺癌细胞增殖、侵袭与迁移以及前列腺癌移植瘤生长的影响,并研究巨噬细胞是否参与该过程。方法分离与培养BALB/c裸鼠BMSC,采用负载ANXA2的慢病毒质粒感染BMSC,并分离外泌体;加入外泌体处理THP-1巨噬细胞,ELISA检测细胞上清培养液肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)、IL-6和IL-10的水平;将外泌体处理的巨噬细胞与前列腺癌细胞共培养后,CCK-8法检测细胞增殖活性,Transwell^(TM)小室检测细胞侵袭与迁移。通过注射PC-3人前列腺癌细胞构建前列腺癌裸鼠移植瘤模型,将建模后的裸鼠随机分为对照组和实验组,每组8只,实验组裸鼠尾静脉注射1 mL Exo-ANXA2,对照组注射等量PBS,于注射后第0、3、6、9、12、15、18、21天,使用游标卡尺测量计算肿瘤体积,21 d处死裸鼠并测量肿瘤组织质量,免疫组织化学染色法检测肿瘤组织中抗原KI-67(ki67)和CD163表达。结果骨髓分离的细胞表面CD90和CD44呈高表达,CD34和CD45呈低表达,且成骨成脂分化能力较强,成功获得BMSC;负载ANXA2的慢病毒质粒感染后,BMSC中有较强的绿色荧光蛋白表达,并成功分离到Exo-ANXA2;经Exo-ANXA2处理后,THP-1细胞中TNF-α和IL-6的水平显著升高而IL-10和IL-13的水平显著下降;Exo-ANXA2处理巨噬细胞后,显著抑制Exo-ANXA2促进PC-3细胞增殖活性、侵袭与迁移的作用;经过给予前列腺癌移植瘤裸鼠注射Exo-ANXA2后,裸鼠在第6、9、12、15、18、21天的肿瘤组织体积显著减小,21 d时裸鼠肿瘤体质量也显著减少,此外,肿瘤组织内ki67和CD163的阳性表达率均显著降低。结论Exo-ANXA2能够抑制前列腺癌细胞增殖、侵袭与迁移,并抑制裸鼠前列腺癌移植瘤生长,M2型巨噬细胞减少。
文摘【目的】从鸡卵泡膜细胞蛋白中筛选和鉴定与膜联蛋白A2(ANXA2)相互作用的细胞蛋白并进行功能分析,为深入研究ANXA2调控鸡卵泡发育的作用机制提供理论依据。【方法】制备开产后30周龄贵州黄鸡的卵泡膜细胞,提取卵泡膜总蛋白后利用His Pull-Down联合质谱技术(LC-MS/MS)从卵泡膜细胞中筛选出与鸡ANXA2互作的细胞蛋白,然后通过GO数据库和KEEG数据库分别进行GO功能富集分析及KEEG信号通路注释分析,并利用STRING Version 11.0绘制蛋白互作网络图。【结果】通过His Pull-Down联合LC-MS/MS共鉴定获得41个鸡ANXA2互作细胞蛋白,GO功能富集分析发现这些互作细胞蛋白在分子功能、生物学进程和细胞组成均发挥作用。其中,在分子功能方面主要涉及蛋白结合(占58.06%)、催化活性(占19.35%)、核糖体结构(占16.13%)及细胞骨架结构组成(占6.45%),在生物学进程方面主要参与细胞骨架(占19.35%)、刺激反应(占19.35%)、翻译(占16.13%)、代谢过程(占12.90%)、细胞迁移(占12.90%)、蛋白折叠(占9.68%)和蛋白运输(占9.68%),而细胞组分显示以定位于细胞膜的蛋白为主(占32.26%)。鸡ANXA2蛋白互作细胞蛋白参与的KEEG信号通路主要有应激反应、代谢、翻译、信号转导、免疫系统和蛋白定位等。鸡ANXA2互作细胞蛋白互作网络可分为3条,即CNN2-FN1-MYH9-MYH10-ACTN1-CSRP1、ANXA1-ANXA2-ENO1-PRDX4-GPI-ATP5B-PRDX3-HSPA8-TUBB2A和CCT7-CCT4-GNB2L1-ATP5A1-RPS3-RPS3A-RPL23A-RPL22-RPS7;互作细胞蛋白间存在复杂的互作关系,其中又以膜联蛋白A1(ANXA1)与烯醇化酶-1(ENO1)及ANXA2的互作关系最明显。【结论】鸡ANXA2互作细胞蛋白主要参与细胞骨架形成、应对刺激和翻译等生物学过程,涉及应激反应、代谢、翻译、信号转导、免疫及蛋白定位等信号通路。其中,PRDX3、PRDX4、MYH9和TCSC可能通过与ANXA2蛋白相互作用而参与鸡卵巢相关疾病的发生,而ANXA1与ANXA2相互作用可能�
基金funded by the General Program of the National Natural Science Foundation of China(31271324)the Fundamental Research Funds for the Central Universities(2572014EA05-03)the Fundamental Research Funds for the Central Universities(DL10BA08)
文摘ANXA2（AnnexinA2）, a calcium-dependent phospholipid bind- ing protein, is involved in various Ca2＋-related biological activities. In the present study, full-length cDNA of ANXA2 was isolated from the velvet antler tip tissue of sika deer （Cervus nippon hortulomm）; the amino acid sequence and gene expression was analyzed by using bioinformatics and real-time reverse transcdptase polymerase chain reaction （RT-PCR） techniques. Nucleotide sequence analysis reveals that the full-length cDNA of the ANXA2 gene was 1372 bp, of which 1020 bp was in the opan-reading frame （OR.F） encoding 339 amino acids; its relative mo- lecular weight was 38.3 kDa; and isoelectrie point was 6.72. Sequence analysis indicates that the protein includes four conserved tan- dem-duplication ANX domains. The gene-aceession nucleotide sequence number in GenBank is JX315571. Expression analysis by RT-PCR re- veals that ANXA2 gene expression has a significant positive correlation with the antler-tissue mineralization process, indicating that this gene may play an important role in the regulation of antler-tissue mineraliza- tion.
