目的探讨在炎性激活条件下的椎间盘退变(IDD)过程中miR-335-3p靶向调控趋化因子配体(CCL)5的机制及可能抑制IDD进展的方法。方法建立人髓核(NP)细胞的原代培养,肿瘤坏死因子(TNF)-α诱导NP细胞,Trizol法获取NP细胞总RNA,随后对mRNA及mi...目的探讨在炎性激活条件下的椎间盘退变(IDD)过程中miR-335-3p靶向调控趋化因子配体(CCL)5的机制及可能抑制IDD进展的方法。方法建立人髓核(NP)细胞的原代培养,肿瘤坏死因子(TNF)-α诱导NP细胞,Trizol法获取NP细胞总RNA,随后对mRNA及miRNA进行高通量测序分析。对miR-335-3p靶向结合mRNA进行预测,结合STRING富集分析miRNA靶标基因,确定TNF-α影响NP细胞的关键基因。应用The Human Protein Atlas(https://www.proteinatlas.org/)分析CCL5及其下游调控蛋白受体趋化因子受体(CCR)5基因在免疫相关细胞中的表达水平。应用Targetscan预测miR-335-3p与CCL53′UTR序列的靶向结合位点。结合promega的双荧光素酶报告系统使用turner仪器进行测量。将人NP细胞分成:Control组(NP细胞)、TNF-α组、mimic-NC组、miR-335-3p mimic组。使用Lipofectamine RNAiMAX将miR-335-3p mimic或miR-NC寡核苷酸序列转染入人NP细胞。采用实时荧光定量聚合酶链反应(qRT-PCR)方法检测miR-335-3p的表达情况。Western印迹实验检测NP细胞外基质相关蛋白的表达水平。结果与Control组比较,TNF-α组miR-335-3p基因表达水平显著下调(P<0.01),CCL5基因表达水平显著上调(P<0.01);miR-335-3p mimic组miR-335-3p表达水平较mimic-NC组显著上调(P<0.01),CCL5表达水平显著较mimic-NC组下调(P<0.01)。与Control组比较,TNF-α组生长分化因子(GDF)5和性别决定区Y框蛋白(SOX)9蛋白显著下调,而基质金属蛋白酶(MMP)2蛋白表达水平显著上调(P<0.01);与mimic-NC组比较,miR-335-3p mimic组MMP2蛋白表达水平显著下调,而GDF5和SOX9蛋白显著上调(P<0.01)。结论miR-335-3p在TNF-α诱导的炎症条件下可特异性下调CCL5,从而逆转TNF-α诱导的软骨生成因子SOX9的异常表达。展开更多
Spinal cord injury causes accumulation of a large number of leukocytes at the lesion site where they contribute to excessive inflammation.Overproduced chemokines are responsible for the migratory process of the leukoc...Spinal cord injury causes accumulation of a large number of leukocytes at the lesion site where they contribute to excessive inflammation.Overproduced chemokines are responsible for the migratory process of the leukocytes,but the regulatory mechanism underlying the production of chemokines from resident cells of the spinal cord has not been fully elucidated.We examined the protein levels of macrophage migration inhibitory factor and chemokine C-C motif chemokine ligand 2 in a spinal cord contusion model at different time points following spinal cord injury.The elevation of macrophage migration inhibitory factor at the lesion site coincided with the increase of chemokine C-C motif chemokine ligand 2 abundance in astrocytes.Stimulation of primary cultured astrocytes with different concentrations of macrophage migration inhibitory factor recombinant protein induced chemokine C-C motif chemokine ligand 2 production from the cells,and the macrophage migration inhibitory factor inhibitor 4-iodo-6-phenylpyrimidine attenuated the stimulatory effect.Further investigation into the underlying mechanism on macrophage migration inhibitory factor-mediated astrocytic production of chemokine C-C motif chemokine ligand 2 revealed that macrophage migration inhibitory factor activated intracellular JNK signaling through binding with CD74 receptor.Administration of the macrophage migration inhibitory factor inhibitor 4-iodo-6-phenylpyrimidine following spinal cord injury resulted in the reduction of chemokine C-C motif chemokine ligand 2-recruited microglia/macrophages at the lesion site and remarkably improved the hindlimb locomotor function of rats.Our results have provided insights into the functions of astrocyte-activated chemokines in the recruitment of leukocytes and may be beneficial to develop interventions targeting chemokine C-C motif chemokine ligand 2 for neuroinflammation after spinal cord injury.展开更多
Osteoporosis is defined as a disorder associated withlow bone mineral density （BMD）. Evidence indicatesthat the immune system is strongly related to bonemetabolism in terms of osteoimmunology, noticeably,interplay b...Osteoporosis is defined as a disorder associated withlow bone mineral density （BMD）. Evidence indicatesthat the immune system is strongly related to bonemetabolism in terms of osteoimmunology, noticeably,interplay between the skeletal and immune system likecellular and non-cellular components, including innateand adaptive immune responses and cytokines andchemokines. Very few studies are available thatinvestigated the role of chemokines in osteoporosis.展开更多
We previously showed that hydrogen sulfide(H2S)has a neuroprotective effect in the context of hypoxic ischemic brain injury in neonatal mice.However,the precise mechanism underlying the role of H2S in this situation r...We previously showed that hydrogen sulfide(H2S)has a neuroprotective effect in the context of hypoxic ischemic brain injury in neonatal mice.However,the precise mechanism underlying the role of H2S in this situation remains unclear.In this study,we used a neonatal mouse model of hypoxic ischemic brain injury and a lipopolysaccharide-stimulated BV2 cell model and found that treatment with L-cysteine,a H2S precursor,attenuated the cerebral infarction and cerebral atrophy induced by hypoxia and ischemia and increased the expression of miR-9-5p and cystathionineβsynthase(a major H2S synthetase in the brain)in the prefrontal cortex.We also found that an miR-9-5p inhibitor blocked the expression of cystathionineβsynthase in the prefrontal cortex in mice with brain injury caused by hypoxia and ischemia.Furthermore,miR-9-5p overexpression increased cystathionine-β-synthase and H2S expression in the injured prefrontal cortex of mice with hypoxic ischemic brain injury.L-cysteine decreased the expression of CXCL11,an miR-9-5p target gene,in the prefrontal cortex of the mouse model and in lipopolysaccharide-stimulated BV-2 cells and increased the levels of proinflammatory cytokines BNIP3,FSTL1,SOCS2 and SOCS5,while treatment with an miR-9-5p inhibitor reversed these changes.These findings suggest that H2S can reduce neuroinflammation in a neonatal mouse model of hypoxic ischemic brain injury through regulating the miR-9-5p/CXCL11 axis and restoringβ-synthase expression,thereby playing a role in reducing neuroinflammation in hypoxic ischemic brain injury.展开更多
文摘目的探讨在炎性激活条件下的椎间盘退变(IDD)过程中miR-335-3p靶向调控趋化因子配体(CCL)5的机制及可能抑制IDD进展的方法。方法建立人髓核(NP)细胞的原代培养,肿瘤坏死因子(TNF)-α诱导NP细胞,Trizol法获取NP细胞总RNA,随后对mRNA及miRNA进行高通量测序分析。对miR-335-3p靶向结合mRNA进行预测,结合STRING富集分析miRNA靶标基因,确定TNF-α影响NP细胞的关键基因。应用The Human Protein Atlas(https://www.proteinatlas.org/)分析CCL5及其下游调控蛋白受体趋化因子受体(CCR)5基因在免疫相关细胞中的表达水平。应用Targetscan预测miR-335-3p与CCL53′UTR序列的靶向结合位点。结合promega的双荧光素酶报告系统使用turner仪器进行测量。将人NP细胞分成:Control组(NP细胞)、TNF-α组、mimic-NC组、miR-335-3p mimic组。使用Lipofectamine RNAiMAX将miR-335-3p mimic或miR-NC寡核苷酸序列转染入人NP细胞。采用实时荧光定量聚合酶链反应(qRT-PCR)方法检测miR-335-3p的表达情况。Western印迹实验检测NP细胞外基质相关蛋白的表达水平。结果与Control组比较,TNF-α组miR-335-3p基因表达水平显著下调(P<0.01),CCL5基因表达水平显著上调(P<0.01);miR-335-3p mimic组miR-335-3p表达水平较mimic-NC组显著上调(P<0.01),CCL5表达水平显著较mimic-NC组下调(P<0.01)。与Control组比较,TNF-α组生长分化因子(GDF)5和性别决定区Y框蛋白(SOX)9蛋白显著下调,而基质金属蛋白酶(MMP)2蛋白表达水平显著上调(P<0.01);与mimic-NC组比较,miR-335-3p mimic组MMP2蛋白表达水平显著下调,而GDF5和SOX9蛋白显著上调(P<0.01)。结论miR-335-3p在TNF-α诱导的炎症条件下可特异性下调CCL5,从而逆转TNF-α诱导的软骨生成因子SOX9的异常表达。
基金supported by the China Postdoctoral Science Foundation,No.2020M681689(to YMH)the Basic Scientific Research Projects of Nantong,Nos.JC2020015(to HX)and JC2020041(to YMH)。
文摘Spinal cord injury causes accumulation of a large number of leukocytes at the lesion site where they contribute to excessive inflammation.Overproduced chemokines are responsible for the migratory process of the leukocytes,but the regulatory mechanism underlying the production of chemokines from resident cells of the spinal cord has not been fully elucidated.We examined the protein levels of macrophage migration inhibitory factor and chemokine C-C motif chemokine ligand 2 in a spinal cord contusion model at different time points following spinal cord injury.The elevation of macrophage migration inhibitory factor at the lesion site coincided with the increase of chemokine C-C motif chemokine ligand 2 abundance in astrocytes.Stimulation of primary cultured astrocytes with different concentrations of macrophage migration inhibitory factor recombinant protein induced chemokine C-C motif chemokine ligand 2 production from the cells,and the macrophage migration inhibitory factor inhibitor 4-iodo-6-phenylpyrimidine attenuated the stimulatory effect.Further investigation into the underlying mechanism on macrophage migration inhibitory factor-mediated astrocytic production of chemokine C-C motif chemokine ligand 2 revealed that macrophage migration inhibitory factor activated intracellular JNK signaling through binding with CD74 receptor.Administration of the macrophage migration inhibitory factor inhibitor 4-iodo-6-phenylpyrimidine following spinal cord injury resulted in the reduction of chemokine C-C motif chemokine ligand 2-recruited microglia/macrophages at the lesion site and remarkably improved the hindlimb locomotor function of rats.Our results have provided insights into the functions of astrocyte-activated chemokines in the recruitment of leukocytes and may be beneficial to develop interventions targeting chemokine C-C motif chemokine ligand 2 for neuroinflammation after spinal cord injury.
文摘Osteoporosis is defined as a disorder associated withlow bone mineral density （BMD）. Evidence indicatesthat the immune system is strongly related to bonemetabolism in terms of osteoimmunology, noticeably,interplay between the skeletal and immune system likecellular and non-cellular components, including innateand adaptive immune responses and cytokines andchemokines. Very few studies are available thatinvestigated the role of chemokines in osteoporosis.
基金supported by the National Natural Science Foundation of China,Nos.82271327(to ZW),82072535(to ZW),81873768(to ZW),and 82001253(to TL).
文摘We previously showed that hydrogen sulfide(H2S)has a neuroprotective effect in the context of hypoxic ischemic brain injury in neonatal mice.However,the precise mechanism underlying the role of H2S in this situation remains unclear.In this study,we used a neonatal mouse model of hypoxic ischemic brain injury and a lipopolysaccharide-stimulated BV2 cell model and found that treatment with L-cysteine,a H2S precursor,attenuated the cerebral infarction and cerebral atrophy induced by hypoxia and ischemia and increased the expression of miR-9-5p and cystathionineβsynthase(a major H2S synthetase in the brain)in the prefrontal cortex.We also found that an miR-9-5p inhibitor blocked the expression of cystathionineβsynthase in the prefrontal cortex in mice with brain injury caused by hypoxia and ischemia.Furthermore,miR-9-5p overexpression increased cystathionine-β-synthase and H2S expression in the injured prefrontal cortex of mice with hypoxic ischemic brain injury.L-cysteine decreased the expression of CXCL11,an miR-9-5p target gene,in the prefrontal cortex of the mouse model and in lipopolysaccharide-stimulated BV-2 cells and increased the levels of proinflammatory cytokines BNIP3,FSTL1,SOCS2 and SOCS5,while treatment with an miR-9-5p inhibitor reversed these changes.These findings suggest that H2S can reduce neuroinflammation in a neonatal mouse model of hypoxic ischemic brain injury through regulating the miR-9-5p/CXCL11 axis and restoringβ-synthase expression,thereby playing a role in reducing neuroinflammation in hypoxic ischemic brain injury.
