Background: Previously, we showed that targeted disruption of viral receptor genes in avian leukosis virus(ALV)subgroups using clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protei...Background: Previously, we showed that targeted disruption of viral receptor genes in avian leukosis virus(ALV)subgroups using clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protein 9(Cas9))-based genome editing confers resistance to ALV subgroups B and J. Here, we used the same strategy to target the receptor expressed by ALV subgroup A(TVA) and generate chicken cells resistant to infection by this virus.Results: CRISPR/Cas9-based disruption of exon 2 within the tva gene of DF-1 fibroblasts conferred resistance to infection by ALV subgroup A regardless of whether frameshift mutations were introduced during editing. Conversely,overexpression of the wild-type TVA receptor(wtTVA) by tva-modified DF-1 clones restored susceptibility to ALV subgroup A. The results confirm that exon 2, which contains the low-density lipoprotein receptor class A domain of TVA, is critical for virus entry. Furthermore, we sequentially modified DF-1 cells by editing the tva, tvb, and Na^+/H^+ exchange 1(chNHE1) genes, which are the specific receptors for ALV subgroups A, B, and J, respectively.Conclusions: Simultaneous editing of multiple receptors to block infection by different subgroups of ALV confirmed that ALV subgroups A, B, and J do not share host receptors. This strategy could be used to generate cells resistant to multiple viral pathogens that use distinct receptors for cell entry.展开更多
Three tetraurea-appended porphyrin derivatives were synthesized and applied as anion receptors to complex with various anions, including F^-, Cl^-, Br^-, I^-, NO3^-, HSO4^-, and AcO^-. The binding stoichiometries were...Three tetraurea-appended porphyrin derivatives were synthesized and applied as anion receptors to complex with various anions, including F^-, Cl^-, Br^-, I^-, NO3^-, HSO4^-, and AcO^-. The binding stoichiometries were all measured to be 1：1 and high binding abilities of these receptors toward the anions were demonstrated with the association constants of up to 1.1 × 10^8 L/mol. The complexation of the receptors with anions was further unambiguously confirmed by single-crystal X-ray analysis展开更多
异基因造血干细胞移植(allo-HSCT)后,供者来源的自然杀伤细胞(NK)可在保留移植物抗白血病(GVL)效应的同时发挥控制移植物抗宿主病(GVHD)作用。NK细胞表面的1磷酸鞘氨醇受体5(S1PR5)通过与胞外的第一信使1磷酸鞘氨醇(S1P)相互作用,调节N...异基因造血干细胞移植(allo-HSCT)后,供者来源的自然杀伤细胞(NK)可在保留移植物抗白血病(GVL)效应的同时发挥控制移植物抗宿主病(GVHD)作用。NK细胞表面的1磷酸鞘氨醇受体5(S1PR5)通过与胞外的第一信使1磷酸鞘氨醇(S1P)相互作用,调节NK细胞的迁移和在外周血、脾、淋巴结等器官中的分布。本研究旨在探讨allo-HSCT后外周血NK细胞S1PR5表达变化及对GVHD的影响。分离纯化17例供者及相应受者移植后1个月外周血NK细胞,通过荧光探针实时定量PCR技术检测S1PR5 mRNA的表达情况,并结合患者临床资料和随访结果进行分析。结果表明,供者与allo-HSCT后患者外周血中NK细胞S1PR5表达变化(0.235±0.191 vs0.330±0.261,P>0.05)不具有统计学意义;急性GVHD(aGVHD)患者组移植后外周血NK细胞S1PR5表达水平较无aGVHD的患者组明显下降(0.973±0.834 vs 6.166±5.32,P<0.05);移植后患者与相应供者相比,外周血NK细胞S1PR5表达水平下降超过10%时易发生aGVHD;NK细胞S1PR5表达变化与慢性GVHD发生率无明显相关性(3.401±2.324 vs 2.762±1.972,P>0.05)。结论:NK细胞S1PR5表达水平下调与aGVHD发生有关,可能机制是由于S1PR5的低表达影响了NK细胞在体内的分布,从而影响到调控aGVHD的作用。展开更多
基金supported by This work was supported by the National Research Foundation of Korea grant funded by the Korea government(MSIP)(NRF-2015R1A3A2033826)“Cooperative Research Program for Agriculture Science and Technology Development(Project No.PJ0131642018)” Rural Development Administration,Republic of Korea+1 种基金supproted by the Royal Society International Professorships(No.IC160046)Biotechnology and BiologicalSciences Research Council(BBSRC)Partnership award(BB/M027481/1),UK
文摘Background: Previously, we showed that targeted disruption of viral receptor genes in avian leukosis virus(ALV)subgroups using clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protein 9(Cas9))-based genome editing confers resistance to ALV subgroups B and J. Here, we used the same strategy to target the receptor expressed by ALV subgroup A(TVA) and generate chicken cells resistant to infection by this virus.Results: CRISPR/Cas9-based disruption of exon 2 within the tva gene of DF-1 fibroblasts conferred resistance to infection by ALV subgroup A regardless of whether frameshift mutations were introduced during editing. Conversely,overexpression of the wild-type TVA receptor(wtTVA) by tva-modified DF-1 clones restored susceptibility to ALV subgroup A. The results confirm that exon 2, which contains the low-density lipoprotein receptor class A domain of TVA, is critical for virus entry. Furthermore, we sequentially modified DF-1 cells by editing the tva, tvb, and Na^+/H^+ exchange 1(chNHE1) genes, which are the specific receptors for ALV subgroups A, B, and J, respectively.Conclusions: Simultaneous editing of multiple receptors to block infection by different subgroups of ALV confirmed that ALV subgroups A, B, and J do not share host receptors. This strategy could be used to generate cells resistant to multiple viral pathogens that use distinct receptors for cell entry.
基金supported by the National Natural Science Foundation of China(Nos.21572042 and 21773052)the Program for Innovative Research Team in Chinese University(No.IRT 1231)+1 种基金the Natural Science Foundation of Zhejing Province(Nos.LZ16B020002 and LQ17B040002)the Public Welfare Technology and Application Program of Zhejiang Province(No.2015C31141)
文摘Three tetraurea-appended porphyrin derivatives were synthesized and applied as anion receptors to complex with various anions, including F^-, Cl^-, Br^-, I^-, NO3^-, HSO4^-, and AcO^-. The binding stoichiometries were all measured to be 1：1 and high binding abilities of these receptors toward the anions were demonstrated with the association constants of up to 1.1 × 10^8 L/mol. The complexation of the receptors with anions was further unambiguously confirmed by single-crystal X-ray analysis
文摘异基因造血干细胞移植(allo-HSCT)后,供者来源的自然杀伤细胞(NK)可在保留移植物抗白血病(GVL)效应的同时发挥控制移植物抗宿主病(GVHD)作用。NK细胞表面的1磷酸鞘氨醇受体5(S1PR5)通过与胞外的第一信使1磷酸鞘氨醇(S1P)相互作用,调节NK细胞的迁移和在外周血、脾、淋巴结等器官中的分布。本研究旨在探讨allo-HSCT后外周血NK细胞S1PR5表达变化及对GVHD的影响。分离纯化17例供者及相应受者移植后1个月外周血NK细胞,通过荧光探针实时定量PCR技术检测S1PR5 mRNA的表达情况,并结合患者临床资料和随访结果进行分析。结果表明,供者与allo-HSCT后患者外周血中NK细胞S1PR5表达变化(0.235±0.191 vs0.330±0.261,P>0.05)不具有统计学意义;急性GVHD(aGVHD)患者组移植后外周血NK细胞S1PR5表达水平较无aGVHD的患者组明显下降(0.973±0.834 vs 6.166±5.32,P<0.05);移植后患者与相应供者相比,外周血NK细胞S1PR5表达水平下降超过10%时易发生aGVHD;NK细胞S1PR5表达变化与慢性GVHD发生率无明显相关性(3.401±2.324 vs 2.762±1.972,P>0.05)。结论:NK细胞S1PR5表达水平下调与aGVHD发生有关,可能机制是由于S1PR5的低表达影响了NK细胞在体内的分布,从而影响到调控aGVHD的作用。
基金Supported by the National Natural Science Foundation of China(20871069)Natural Science Foundation of Jiangsu Province(BK2008428)Fund of State Key Laboratory of Coordination Chemistry
