Studies on ischemia/reperfusion(I/R)injury suggest that exogenous neural stem cells(NSCs)are ideal candidates for stem cell therapy reperfusion injury.However,NSCs are difficult to obtain owing to ethical limitations....Studies on ischemia/reperfusion(I/R)injury suggest that exogenous neural stem cells(NSCs)are ideal candidates for stem cell therapy reperfusion injury.However,NSCs are difficult to obtain owing to ethical limitations.In addition,the survival,differentiation,and proliferation rates of transplanted exogenous NSCs are low,which limit their clinical application.Our previous study showed that neuregulin1β(NRG1β)alleviated cerebral I/R injury in rats.In this study,we aimed to induce human umbilical cord mesenchymal stem cells into NSCs and investigate the improvement effect and mechanism of NSCs pretreated with 10 nM NRG1βon PC12 cells injured by oxygen-glucose deprivation/reoxygenation(OGD/R).Our results found that 5 and 10 nM NRG1βpromoted the generation and proliferation of NSCs.Co-culture of NSCs and PC12 cells under condition of OGD/R showed that pretreatment of NSCs with NRG1βimproved the level of reactive oxygen species,malondialdehyde,glutathione,superoxide dismutase,nicotinamide adenine dinucleotide phosphate,and nuclear factor erythroid 2-related factor 2(Nrf2)and mitochondrial damage in injured PC12 cells;these indexes are related to ferroptosis.Research has reported that p53 and solute carrier family 7 member 11(SLC7A11)play vital roles in ferroptosis caused by cerebral I/R injury.Our data show that the expression of p53 was increased and the level of glutathione peroxidase 4(GPX4)was decreased after RNA interference-mediated knockdown of SLC7A11 in PC12 cells,but this change was alleviated after co-culturing NSCs with damaged PC12 cells.These findings suggest that NSCs pretreated with NRG1βexhibited neuroprotective effects on PC12 cells subjected to OGD/R through influencing the level of ferroptosis regulated by p53/SLC7A11/GPX4 pathway.展开更多
目的探讨Russell-Silver综合征(RSS)发病机制。方法采集6例男性,年龄6~8岁的临床表型疑似RSS患儿,以及2例患儿父母、5例健康男性儿童的外周血2 m L,分离单个核细胞并提取基因组DNA,应用焦磷酸测序技术进行分析,检测染色体11p15.5上印记...目的探讨Russell-Silver综合征(RSS)发病机制。方法采集6例男性,年龄6~8岁的临床表型疑似RSS患儿,以及2例患儿父母、5例健康男性儿童的外周血2 m L,分离单个核细胞并提取基因组DNA,应用焦磷酸测序技术进行分析,检测染色体11p15.5上印记基因控制区域(ICR)1的H19基因的甲基化水平。应用甲基化特异性多重连接探针扩增技术(MS-MLPA)对1例焦磷酸测序结果阳性且为RSS患儿的甲基化水平进行验证分析并对相应区域的基因拷贝数进行检测。结果焦磷酸测序结果显示,6例患儿在H19-差异甲基化区域(DMR)的6个Cp G位点的甲基化率为11%~29%;患儿父母及正常对照组对应位点的甲基化率为44%~59%。焦磷酸测序结果阳性的1例患儿对应的MS-MLPA结果显示,H19基因的4个位点甲基化率在10%左右,明显低于正常水平。KCNQ1OT1基因的4个位点甲基化率约为50%,在正常范围内。所测样本的基因拷贝数均在正常范围内。结论 RSS患儿的ICR1的H19-DMR存在甲基化水平异常。展开更多
基金supported by the National Natural Science Foundation of China,No.81973501the Natural Science Foundation of Shandong Province,No.ZR2019MH009(both to YLG).
文摘Studies on ischemia/reperfusion(I/R)injury suggest that exogenous neural stem cells(NSCs)are ideal candidates for stem cell therapy reperfusion injury.However,NSCs are difficult to obtain owing to ethical limitations.In addition,the survival,differentiation,and proliferation rates of transplanted exogenous NSCs are low,which limit their clinical application.Our previous study showed that neuregulin1β(NRG1β)alleviated cerebral I/R injury in rats.In this study,we aimed to induce human umbilical cord mesenchymal stem cells into NSCs and investigate the improvement effect and mechanism of NSCs pretreated with 10 nM NRG1βon PC12 cells injured by oxygen-glucose deprivation/reoxygenation(OGD/R).Our results found that 5 and 10 nM NRG1βpromoted the generation and proliferation of NSCs.Co-culture of NSCs and PC12 cells under condition of OGD/R showed that pretreatment of NSCs with NRG1βimproved the level of reactive oxygen species,malondialdehyde,glutathione,superoxide dismutase,nicotinamide adenine dinucleotide phosphate,and nuclear factor erythroid 2-related factor 2(Nrf2)and mitochondrial damage in injured PC12 cells;these indexes are related to ferroptosis.Research has reported that p53 and solute carrier family 7 member 11(SLC7A11)play vital roles in ferroptosis caused by cerebral I/R injury.Our data show that the expression of p53 was increased and the level of glutathione peroxidase 4(GPX4)was decreased after RNA interference-mediated knockdown of SLC7A11 in PC12 cells,but this change was alleviated after co-culturing NSCs with damaged PC12 cells.These findings suggest that NSCs pretreated with NRG1βexhibited neuroprotective effects on PC12 cells subjected to OGD/R through influencing the level of ferroptosis regulated by p53/SLC7A11/GPX4 pathway.
文摘目的探讨Russell-Silver综合征(RSS)发病机制。方法采集6例男性,年龄6~8岁的临床表型疑似RSS患儿,以及2例患儿父母、5例健康男性儿童的外周血2 m L,分离单个核细胞并提取基因组DNA,应用焦磷酸测序技术进行分析,检测染色体11p15.5上印记基因控制区域(ICR)1的H19基因的甲基化水平。应用甲基化特异性多重连接探针扩增技术(MS-MLPA)对1例焦磷酸测序结果阳性且为RSS患儿的甲基化水平进行验证分析并对相应区域的基因拷贝数进行检测。结果焦磷酸测序结果显示,6例患儿在H19-差异甲基化区域(DMR)的6个Cp G位点的甲基化率为11%~29%;患儿父母及正常对照组对应位点的甲基化率为44%~59%。焦磷酸测序结果阳性的1例患儿对应的MS-MLPA结果显示,H19基因的4个位点甲基化率在10%左右,明显低于正常水平。KCNQ1OT1基因的4个位点甲基化率约为50%,在正常范围内。所测样本的基因拷贝数均在正常范围内。结论 RSS患儿的ICR1的H19-DMR存在甲基化水平异常。
