目的:探讨circ-0030042与人第10号染色体缺失的磷酸酶(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)的相互作用关系,并分析其在增生性瘢痕(Hypertrophic scar,HS)患者中对成纤维细胞增殖与迁移的影响及作用机制。方...目的:探讨circ-0030042与人第10号染色体缺失的磷酸酶(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)的相互作用关系,并分析其在增生性瘢痕(Hypertrophic scar,HS)患者中对成纤维细胞增殖与迁移的影响及作用机制。方法:通过circRNA序列和定量聚合酶链反应(PCR技术)检测正常皮肤成纤维细胞(NSFBs)和增生性瘢痕患者成纤维细胞(HSFBs)中circ-0030042的表达。用CCK8检测法检测转染48 h后的HSFBs细胞增殖情况。利用stubRFP-sensGFP-LC3基因转染、流式细胞仪及电子显微镜观察circ-0030042对miR-145/PTEN轴调控VEGF水平的表达。利用生物信息学分析、RNA免疫沉淀、免疫荧光检测等方法,揭示circ-0030042介导HS患者成纤维细胞增殖与迁移的作用机制。结果:circ-0030042在增生性瘢痕中显著上调,过表达时作为VEGF海绵抑制miR-145诱导的成纤维细胞,维持体内稳定性。此外,circ-0030042通过海绵化VEGF水平并阻断其miR-145捕获转录因子(FOXO1)mRNA来影响自噬,而circ-0030042诱导FOXO1的抑制被VEGF水平过表达或circ-0030042结合减少所抵消。过表达circ-0030042对成纤维细胞的增殖抑制与VEGF表达的抑制作用被过表达miR-145部分抵消。结论:干扰circ-0030042通过靶向下调miR-145/PTEN轴进而抑制HSFBs细胞的增殖与迁移,进一步诱导恶性细胞凋亡。展开更多
Neuroinflammation exacerbates secondary damage after spinal cord injury,while microglia/macrophage pyroptosis is important to neuroinflammation.Circular RNAs(circRNAs)play a role in the central nervous system.However,...Neuroinflammation exacerbates secondary damage after spinal cord injury,while microglia/macrophage pyroptosis is important to neuroinflammation.Circular RNAs(circRNAs)play a role in the central nervous system.However,the functional role and mechanism of circRNAs in regulating microglia/macrophage pyroptosis after spinal cord injury are still poorly studied.In the present study,we detected microglia/macrophage pyroptosis in a female rat model of spinal cord injury,along with upregulated levels of circ0000381 in the spinal cord.Our further experimental results suggest that circ0000381 may function as a sponge to sequester endogenous microRNA423-3p(miR-423-3p),which can increase the expression of NOD-like receptor 3(NLRP3),a pyroptosis marker.Therefore,upregulation of circ0000381 may be a compensatory change after spinal cord injury to attenuate microglia/macrophage pyroptosis.Indeed,knockdown of circ0000381 expression exacerbated microglia/macrophage pyroptosis.Collectively,our findings provide novel evidence for the upregulation of circ0000381,which may serve as a neuroprotective mechanism to attenuate microglia/macrophage pyroptosis after spinal cord injury.Accordingly,circ0000381 may be a novel therapeutic target for the treatment of spinal cord injury.展开更多
文摘目的:探讨circ-0030042与人第10号染色体缺失的磷酸酶(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)的相互作用关系,并分析其在增生性瘢痕(Hypertrophic scar,HS)患者中对成纤维细胞增殖与迁移的影响及作用机制。方法:通过circRNA序列和定量聚合酶链反应(PCR技术)检测正常皮肤成纤维细胞(NSFBs)和增生性瘢痕患者成纤维细胞(HSFBs)中circ-0030042的表达。用CCK8检测法检测转染48 h后的HSFBs细胞增殖情况。利用stubRFP-sensGFP-LC3基因转染、流式细胞仪及电子显微镜观察circ-0030042对miR-145/PTEN轴调控VEGF水平的表达。利用生物信息学分析、RNA免疫沉淀、免疫荧光检测等方法,揭示circ-0030042介导HS患者成纤维细胞增殖与迁移的作用机制。结果:circ-0030042在增生性瘢痕中显著上调,过表达时作为VEGF海绵抑制miR-145诱导的成纤维细胞,维持体内稳定性。此外,circ-0030042通过海绵化VEGF水平并阻断其miR-145捕获转录因子(FOXO1)mRNA来影响自噬,而circ-0030042诱导FOXO1的抑制被VEGF水平过表达或circ-0030042结合减少所抵消。过表达circ-0030042对成纤维细胞的增殖抑制与VEGF表达的抑制作用被过表达miR-145部分抵消。结论:干扰circ-0030042通过靶向下调miR-145/PTEN轴进而抑制HSFBs细胞的增殖与迁移,进一步诱导恶性细胞凋亡。
基金supported by the National Natural Science Foundation of China,No.81901241(to YZ)。
文摘Neuroinflammation exacerbates secondary damage after spinal cord injury,while microglia/macrophage pyroptosis is important to neuroinflammation.Circular RNAs(circRNAs)play a role in the central nervous system.However,the functional role and mechanism of circRNAs in regulating microglia/macrophage pyroptosis after spinal cord injury are still poorly studied.In the present study,we detected microglia/macrophage pyroptosis in a female rat model of spinal cord injury,along with upregulated levels of circ0000381 in the spinal cord.Our further experimental results suggest that circ0000381 may function as a sponge to sequester endogenous microRNA423-3p(miR-423-3p),which can increase the expression of NOD-like receptor 3(NLRP3),a pyroptosis marker.Therefore,upregulation of circ0000381 may be a compensatory change after spinal cord injury to attenuate microglia/macrophage pyroptosis.Indeed,knockdown of circ0000381 expression exacerbated microglia/macrophage pyroptosis.Collectively,our findings provide novel evidence for the upregulation of circ0000381,which may serve as a neuroprotective mechanism to attenuate microglia/macrophage pyroptosis after spinal cord injury.Accordingly,circ0000381 may be a novel therapeutic target for the treatment of spinal cord injury.