目的研究miR-145-3p能否调控人牙周膜成纤维细胞(HPDLFs)的自噬及其可能存在的作用机制。方法收集12~18岁因正畸需要减数而拔除的健康前磨牙,采集和培养HPDLFs,并进行鉴定。将miR-145-3p类似物(miR-145-3p-mimics组)、miR-145-3p抑制物(...目的研究miR-145-3p能否调控人牙周膜成纤维细胞(HPDLFs)的自噬及其可能存在的作用机制。方法收集12~18岁因正畸需要减数而拔除的健康前磨牙,采集和培养HPDLFs,并进行鉴定。将miR-145-3p类似物(miR-145-3p-mimics组)、miR-145-3p抑制物(miR-145-3p-inhibitor组)、阴性对照(miR-145-3p normal control,miR-145-3p-NC组)以及带有GFP-LC3的质粒转染至HPDLFs,24 h后荧光显微镜观察荧光发生情况。双荧光素酶报告实验验证miR-145-3p与HDAC4的靶向关系,Western Blot检测各转染组细胞内HDAC4、Beclin-1、P62和LC3的蛋白表达。结果免疫组化结果表明,波形蛋白为阳性染色而角蛋白呈阴性染色,证明其为无混杂细胞的HPDLFs。转染结果显示,miR-145-3p-mimics组的细胞内荧光强度最高,有大量自噬体形成,而miR-145-3p-inhibitor组荧光最弱。双荧光素酶报告实验证实miR-145-3p靶向抑制HPDLFs细胞中HDAC4的表达。4组细胞中miR-145-3p-inhibitor组P62蛋白表达最高(P<0.05),而其他3组差异无统计学意义(P>0.05);miR-145-3p-mimics组细胞内Beclin-1和LC3蛋白表达最高(P<0.05),其他3组差异无统计学意义(P>0.05)。结论miR-145-3p在HPDLFs中可调控自噬,这种作用可能是通过靶向抑制HDAC4表达实现的。展开更多
This study was designed to investigate the effect of 002C-3, a derivative of magnolol, on transient cerebral middle occlusion （tMCAO） in a mice model and to identify the underlying mechanisms. 002C-3 （100 and 150 p...This study was designed to investigate the effect of 002C-3, a derivative of magnolol, on transient cerebral middle occlusion （tMCAO） in a mice model and to identify the underlying mechanisms. 002C-3 （100 and 150 pg/kg, i.v. after ending occlusion） significantly reduced neurological deficit scores, infarct volumes, and brain water contents after 1.5 h MCAO and 24 h reperfusion. 002C-3 （75 150μg/kg） decreased the exudation of Evans blue from brain capillaries. 002C-3 （100 μg/kg） significantly inhibited the activity of MMP-9 and MMP-2 in the injured hemisphere. 002C-3 decreased the expression of autophagy-associated proteins, Beclin-1 and LC3B-Ⅱ, and increased the level of p62 in injured hemisphere. 002C-3 （100 pg/kg） significantly increased the expression of p-CaMKIV and p-HDAC4 in injured hemisphere. In conclusion, 002C-3 shows a neuroprotective effect on tMCAO injury in mice, and its mechanisms may be associated with alleviation of blood-brain barrier damage caused by the activation of MMPs, inhibition of autophagy, and stimulation of calcium signals related to cell survival. These findings suggest that 002C-3 is a neuroprotective agent that acts on multiple pathways.展开更多
Human adipose-derived stem cells(hASCs)are a promising cell type for bone tissue regeneration.Circular RNAs(circRNAs)have been shown to play a critical role in regulating various cell differentiation and involve in me...Human adipose-derived stem cells(hASCs)are a promising cell type for bone tissue regeneration.Circular RNAs(circRNAs)have been shown to play a critical role in regulating various cell differentiation and involve in mesenchymal stem cell osteogenesis.However,how circRNAs regulate hASCs in osteogenesis is still unclear.Herein,we found circ_0003204 was significantly downregulated during osteogenic differentiation of hASCs.Knockdown of circ_0003204 by si RNA or overexpression by lentivirus confirmed circ_0003204 could negatively regulate the osteogenic differentiation of hASCs.We performed dual-luciferase reporting assay and rescue experiments to verify circ_0003204 regulated osteogenic differentiation via sponging miR-370-3p.We predicted and confirmed that miR-370-3p had targets in the 3′-UTR of HDAC4 m RNA.The following rescue experiments indicated that circ_0003204 regulated the osteogenic differentiation of hASCs via miR-370-3p/HDAC4 axis.Subsequent in vivo experiments showed the silencing of circ_0003204 increased the bone formation and promoted the expression of osteogenic-related proteins in a mouse bone defect model,while overexpression of circ_0003204 inhibited bone defect repair.Our findings indicated that circ_0003204 might be a promising target to promote the efficacy of hASCs in repairing bone defects.展开更多
文摘目的研究miR-145-3p能否调控人牙周膜成纤维细胞(HPDLFs)的自噬及其可能存在的作用机制。方法收集12~18岁因正畸需要减数而拔除的健康前磨牙,采集和培养HPDLFs,并进行鉴定。将miR-145-3p类似物(miR-145-3p-mimics组)、miR-145-3p抑制物(miR-145-3p-inhibitor组)、阴性对照(miR-145-3p normal control,miR-145-3p-NC组)以及带有GFP-LC3的质粒转染至HPDLFs,24 h后荧光显微镜观察荧光发生情况。双荧光素酶报告实验验证miR-145-3p与HDAC4的靶向关系,Western Blot检测各转染组细胞内HDAC4、Beclin-1、P62和LC3的蛋白表达。结果免疫组化结果表明,波形蛋白为阳性染色而角蛋白呈阴性染色,证明其为无混杂细胞的HPDLFs。转染结果显示,miR-145-3p-mimics组的细胞内荧光强度最高,有大量自噬体形成,而miR-145-3p-inhibitor组荧光最弱。双荧光素酶报告实验证实miR-145-3p靶向抑制HPDLFs细胞中HDAC4的表达。4组细胞中miR-145-3p-inhibitor组P62蛋白表达最高(P<0.05),而其他3组差异无统计学意义(P>0.05);miR-145-3p-mimics组细胞内Beclin-1和LC3蛋白表达最高(P<0.05),其他3组差异无统计学意义(P>0.05)。结论miR-145-3p在HPDLFs中可调控自噬,这种作用可能是通过靶向抑制HDAC4表达实现的。
基金National Natural Science Foundation of China(Grant No.81302763,81573333)Beijing Natural Science Foundation(Grant No.7144218)
文摘This study was designed to investigate the effect of 002C-3, a derivative of magnolol, on transient cerebral middle occlusion （tMCAO） in a mice model and to identify the underlying mechanisms. 002C-3 （100 and 150 pg/kg, i.v. after ending occlusion） significantly reduced neurological deficit scores, infarct volumes, and brain water contents after 1.5 h MCAO and 24 h reperfusion. 002C-3 （75 150μg/kg） decreased the exudation of Evans blue from brain capillaries. 002C-3 （100 μg/kg） significantly inhibited the activity of MMP-9 and MMP-2 in the injured hemisphere. 002C-3 decreased the expression of autophagy-associated proteins, Beclin-1 and LC3B-Ⅱ, and increased the level of p62 in injured hemisphere. 002C-3 （100 pg/kg） significantly increased the expression of p-CaMKIV and p-HDAC4 in injured hemisphere. In conclusion, 002C-3 shows a neuroprotective effect on tMCAO injury in mice, and its mechanisms may be associated with alleviation of blood-brain barrier damage caused by the activation of MMPs, inhibition of autophagy, and stimulation of calcium signals related to cell survival. These findings suggest that 002C-3 is a neuroprotective agent that acts on multiple pathways.
基金supported by grants from the National Natural Science Foundation of China(82071150,82170934,81870743,8190104 and 82171001)。
文摘Human adipose-derived stem cells(hASCs)are a promising cell type for bone tissue regeneration.Circular RNAs(circRNAs)have been shown to play a critical role in regulating various cell differentiation and involve in mesenchymal stem cell osteogenesis.However,how circRNAs regulate hASCs in osteogenesis is still unclear.Herein,we found circ_0003204 was significantly downregulated during osteogenic differentiation of hASCs.Knockdown of circ_0003204 by si RNA or overexpression by lentivirus confirmed circ_0003204 could negatively regulate the osteogenic differentiation of hASCs.We performed dual-luciferase reporting assay and rescue experiments to verify circ_0003204 regulated osteogenic differentiation via sponging miR-370-3p.We predicted and confirmed that miR-370-3p had targets in the 3′-UTR of HDAC4 m RNA.The following rescue experiments indicated that circ_0003204 regulated the osteogenic differentiation of hASCs via miR-370-3p/HDAC4 axis.Subsequent in vivo experiments showed the silencing of circ_0003204 increased the bone formation and promoted the expression of osteogenic-related proteins in a mouse bone defect model,while overexpression of circ_0003204 inhibited bone defect repair.Our findings indicated that circ_0003204 might be a promising target to promote the efficacy of hASCs in repairing bone defects.
