Functional effects of microRNA-211-5p-targeted inhibition of erythropoietin hepatocyte kinase receptor and ligand B2 signaling pathway on spinal cord nerve injury
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目的 检测微小RNA（miR）-211-5p、促红细胞生成素肝细胞激酶受体B2（EphB2）及促红细胞生成素肝细胞激酶配体B2（ephrin B2）在脊髓损伤（SCI）后脊髓组织以及神经细胞中的表达，探讨其对SCI大鼠神经功能恢复的机制和效果。 方法 2020年5月至2021年6月采用斯普拉格-道利（SD）大鼠和未受伤的PC12细胞进行前瞻性研究。SD大鼠分为假手术组和SCI组，每组各30只，在术后不同时间点（1、3、7、14、21和28 d）进行Basso-Beattie-Bresnahan（BBB）评分，实时荧光定量聚合酶链反应（qPCR）检测miR-211-5p和Eph/ephrin B2 mRNA的相对表达含量；另将SCI大鼠分为重组慢病毒载体LV-miR-211-5p组（A组）、空慢病毒载体LV-eGFP（B组）、0.9%氯化钠组（C组），每组15只，分别重组慢病毒载体、空慢病毒载体和0.9%氯化钠注射于脊髓损伤处头、尾侧，于术后1、7和14 d收集BBB评分，检测脊髓组织中的miR-211-5p和Eph/ephrin B2 mRNA的相对表达含量，另用免疫荧光染色法检测各组GAP-43和突触素的表达。另外用150 μmol/L过氧化氢（H2O2）建立PC12损伤细胞系模型，分别用流式细胞术、Western blot检测不同细胞系的凋亡率和凋亡相关蛋白和含量，双荧光素酶报告基因验证miR-211-5p是否靶向调控EphB2。 结果 动物实验结果显示，术后不同时间点，SCI组的miR-211-5p在损伤后1、3、7、14、21和28 d水平低于假手术组（0.70 ± 0.03比1.00 ± 0.10、0.60 ± 0.04比1.00 ± 0.05、0.45 ± 0.10比1.00 ± 0.12、0.30 ± 0.06比1.00 ± 0.15、0.20 ± 0.05比1.00 ± 0.13、0.10 ± 0.02比1.00 ± 0.07），EphB2和ephrinB2水平高于假手术组（1.10 ± 0.05比1.00 ± 0.01、1.80 ± 0.01比1.00 ± 0.08、2.30 ± 0.01比1.00 ± 0.10、2.60 ± 0.01比1.00 ± 0.05、2.80 ± 0.01比1.00 ± 0.06、3.00 ± 0.01比1.00 ± 0.07，1.20 ± 0.05比1.00 ± 0.02、1.60 ± 0.01比1.00 ± 0.03、2.10 ± 0.10比1.00 ± 0.01、2.40 ± 0.11比1.00 ± 0.09、2.70 ± 0.13比1.00 ± 0.05、2.90 ± 0.12比1.00 ± 0.03），差异均有统计学意义（P<0.05）；术后14 d，A组BBB评分高于B组和C组[（14.0 ± 1.1）分比（8.0 ± 1.1）和（8.2 ± 1.2）分]，miR-211-5p水平高于B组和C组（1.90 ± 0.10比0.40 ± 0.01和0.50 ± 0.02），Eph/ephrin B2水平低于B组和C组（0.70 ± 0.10比1.80 ± 0.04和1.90 ± 0.06，0.60 ± 0.03比2.00 ± 0.04和2.10 ± 0.05），差异均有统计学意义（P<0.05）；免疫荧光染色示，术后14 d A组GAP-43和突触素含量均高于B组和C组（P<0.05）。细胞实验结果显示，过表达miR-211-5p能够抑制H2O2诱导的PC12细胞凋亡率和细胞凋亡相关基因Cleaved-caspase3的表达（P<0.05）。敲低miR-211-5p能够提高H2O2诱导的PC12细胞凋亡率和细胞凋亡相关基因Cleaved-caspase3的表达（P<0.05）。双荧光素酶报告基因实验证实EphB2是miR-211-5p的靶基因，过表达EphB2可拮抗miR-211-5p对H2O2诱导的PC12后细胞凋亡抑制作用。 结论 miR-211-5p可通过抑制Eph/ephrin B2信号通路的表达而促进SCI的神经功能修复，提示把Eph/ephrin B2作为靶点，采用miR-211-5p抑制Eph/ephrin B2信号通路可能对SCI有保护作用。 Objective To detect the expression of microRNA (miR)-211-5p, erythropoietin hepatocyte kinase receptor B2 (EphB2) and erythropoietin hepatocyte kinase ligand B2 (ephrin B2) in spinal cord tissues as well as nerve cells after spinal cord injury (SCI), and to explore their mechanisms and effects on neurological recovery in SCI rats. Methods The study was conducted from May 2020 to June 2021 using Sprague Dawley (SD) rats and PC12 cells. SD rats were divided into sham-operated group and SCI group of 30 rats each, and Basso-Beattie-Bresnahan (BBB) score were performed at different postoperative time points (1, 3, 7, 14, 21 and 28 d), and the relative expression of miR-211-5p and Eph/ephrin B2 mRNA was measured by quantitative real-time polymerase chain reaction (qPCR) the SCI rats were divided into recombinant lentiviral vector LV-miR-211-5p group (group A), empty lentiviral vector LV-eGFP (group B) and saline group (group C), with 15 rats in each group, respectively. The recombinant lentiviral vector, empty lentiviral vector and saline were injected on the cephalic and caudal sides of the spinal cord injury, and the relative expression of miR-211-5p and Eph/ephrin B2 mRNA in the spinal cord tissue was measured at 1, 7 and 14 d after surgery. In addition, a PC12 injury cell line model was established with 150 μmol/L hydrogen peroxide (H 2O2), and the apoptosis rate and apoptosis-related proteins and contents of different cell lines were detected by flow cytometry and Western blot, respectively. MiR-211-5p was verified to target EphB2 by dual luciferase reporter gene. Results The results of the animal experiments showed that at different postoperative time points, the miR-211-5p levels in the SCI group were lower than those in the SHAM group: 0.70 ± 0.03 vs. 1.00 ± 0.10, 0.60 ± 0.04 vs. 1.00 ± 0.05, 0.45 ± 0.10 vs. 1.00 ± 0.12, 0.30 ± 0.06 vs. 1.00 ± 0.15, 0.20 ± 0.05 vs. 1.00 ± 0.13, 0.10 ± 0.02 vs. 1.00 ± 0.07. In contrast, levels of Eph/ephrin B2 were higher in the SCI group compared to the SHAM group: 1.10 ± 0.05 vs. 1.00 ± 0.01, 1.80 ± 0.01 vs. 1.00 ± 0.08, 2.30 ± 0.01 vs. 1.00 ± 0.10, 2.60 ± 0.01 vs. 1.00 ± 0.05, 2.80 ± 0.01 vs. 1.00 ± 0.06, 3.00 ± 0.01 vs. 1.00 ± 0.07 and 1.20 ± 0.05 vs. 1.00 ± 0.02, 1.60 ± 0.01 vs. 1.00 ± 0.03, 2.10 ± 0.10 vs. 1.00 ± 0.01, 2.40 ± 0.11 vs. 1.00 ± 0.09, 2.70 ± 0.13 vs. 1.00 ± 0.05, 2.90 ± 0.12 vs. 1.00 ± 0.03 (P<0.05). At 14 d after surgery, Group A exhibited higher BBB scores than Groups B and C: (14.0 ± 1.1) points vs. (8.0 ± 1.1) and (8.2 ± 1.2) points, while miR-211-5p levels were higher than those in Groups B and C: 1.90 ± 0.10 vs. 0.40 ± 0.01 and 0.50 ± 0.02, and Eph/ephrin B2 levels were lower than those in Groups B and C: 0.70 ± 0.10 vs. 1.80 ± 0.04 and 1.90 ± 0.06, 0.60 ± 0.03 vs. 2.00 ± 0.04 and 2.10 ± 0.05 (P<0.05). Immunofluorescence staining showed that the levels of GAP-43 and synaptophysin in group A were higher than those in groups B and C at 14 d after surgery (P<0.05). Cellular assays showed that overexpression of miR-211-5p inhibited the apoptosis rate of H2O2-induced PC12 cells and the expression of the apoptosis-related gene Cleaved-caspase3 (P<0.05). Knockdown of miR-211-5p increased the apoptosis rate of H2O2-induced PC12 cells and the expression of the apoptosis-related gene Cleaved-caspase3 (P<0.05). Dual luciferase reporter gene assay confirmed that EphB2 was a target gene of miR-211-5p and overexpression of EphB2 antagonized the inhibitory apoptosis effect of miR-211-5p on H2O2-induced PC12 cells. Conclusions This study showed that miR-211-5p could promote neurological repair in SCI by inhibiting the expression of Eph/ephrin B2 signaling pathway, suggesting that using miR-211-5p as a target to inhibit Eph/ephrin B2 signaling pathway may have a protective effect on SCI.
Objective To detect the expression of microRNA (miR)-211-5p, erythropoietin hepatocyte kinase receptor B2 (EphB2) and erythropoietin hepatocyte kinase ligand B2 (ephrin B2) in spinal cord tissues as well as nerve cells after spinal cord injury (SCI), and to explore their mechanisms and effects on neurological recovery in SCI rats. Methods The study was conducted from May 2020 to June 2021 using Sprague Dawley (SD) rats and PC12 cells. SD rats were divided into sham-operated group and SCI group of 30 rats each, and Basso-Beattie-Bresnahan (BBB) score were performed at different postoperative time points (1, 3, 7, 14, 21 and 28 d), and the relative expression of miR-211-5p and Eph/ephrin B2 mRNA was measured by quantitative real-time polymerase chain reaction (qPCR) the SCI rats were divided into recombinant lentiviral vector LV-miR-211-5p group (group A), empty lentiviral vector LV-eGFP (group B) and saline group (group C), with 15 rats in each group, respectively. The recombinant lentiviral vector, empty lentiviral vector and saline were injected on the cephalic and caudal sides of the spinal cord injury, and the relative expression of miR-211-5p and Eph/ephrin B2 mRNA in the spinal cord tissue was measured at 1, 7 and 14 d after surgery. In addition, a PC12 injury cell line model was established with 150 μmol/L hydrogen peroxide (H 2O2), and the apoptosis rate and apoptosis-related proteins and contents of different cell lines were detected by flow cytometry and Western blot, respectively. MiR-211-5p was verified to target EphB2 by dual luciferase reporter gene. Results The results of the animal experiments showed that at different postoperative time points, the miR-211-5p levels in the SCI group were lower than those in the SHAM group: 0.70 ± 0.03 vs. 1.00 ± 0.10, 0.60 ± 0.04 vs. 1.00 ± 0.05, 0.45 ± 0.10 vs. 1.00 ± 0.12, 0.30 ± 0.06 vs. 1.00 ± 0.15, 0.20 ± 0.05 vs. 1.00 ± 0.13, 0.10 ± 0.02 vs. 1.00 ± 0.07. In contrast, levels of Eph/ephrin B2 were higher in the SCI group compared to the SHAM group: 1.10 ± 0.05 vs. 1.00 ± 0.01, 1.80 ± 0.01 vs. 1.00 ± 0.08, 2.30 ± 0.01 vs. 1.00 ± 0.10, 2.60 ± 0.01 vs. 1.00 ± 0.05, 2.80 ± 0.01 vs. 1.00 ± 0.06, 3.00 ± 0.01 vs. 1.00 ± 0.07 and 1.20 ± 0.05 vs. 1.00 ± 0.02, 1.60 ± 0.01 vs. 1.00 ± 0.03, 2.10 ± 0.10 vs. 1.00 ± 0.01, 2.40 ± 0.11 vs. 1.00 ± 0.09, 2.70 ± 0.13 vs. 1.00 ± 0.05, 2.90 ± 0.12 vs. 1.00 ± 0.03 (P<0.05). At 14 d after surgery, Group A exhibited higher BBB scores than Groups B and C: (14.0 ± 1.1) points vs. (8.0 ± 1.1) and (8.2 ± 1.2) points, while miR-211-5p levels were higher than those in Groups B and C: 1.90 ± 0.10 vs. 0.40 ± 0.01 and 0.50 ± 0.02, and Eph/ephrin B2 levels were lower than those in Groups B and C: 0.70 ± 0.10 vs. 1.80 ± 0.04 and 1.90 ± 0.06, 0.60 ± 0.03 vs. 2.00 ± 0.04 and 2.10 ± 0.05 (P<0.05). Immunofluorescence staining showed that the levels of GAP-43 and synaptophysin in group A were higher than those in groups B and C at 14 d after surgery (P<0.05). Cellular assays showed that overexpression of miR-211-5p inhibited the apoptosis rate of H2O2-induced PC12 cells and the expression of the apoptosis-related gene Cleaved-caspase3 (P<0.05). Knockdown of miR-211-5p increased the apoptosis rate of H2O2-induced PC12 cells and the expression of the apoptosis-related gene Cleaved-caspase3 (P<0.05). Dual luciferase reporter gene assay confirmed that EphB2 was a target gene of miR-211-5p and overexpression of EphB2 antagonized the inhibitory apoptosis effect of miR-211-5p on H2O2-induced PC12 cells. Conclusions This study showed that miR-211-5p could promote neurological repair in SCI by inhibiting the expression of Eph/ephrin B2 signaling pathway, suggesting that using miR-211-5p as a target to inhibit Eph/ephrin B2 signaling pathway may have a protective effect on SCI.
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