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
Background: Recent studies indicate that C-X-C motif chemokine receptor 4(CXCR4) and its ligand, C-X-C motif chemokine ligand 12(CXCL12), stimulate expression of the cell cycle regulatory protein Cyclin D1 in neurofib...Background: Recent studies indicate that C-X-C motif chemokine receptor 4(CXCR4) and its ligand, C-X-C motif chemokine ligand 12(CXCL12), stimulate expression of the cell cycle regulatory protein Cyclin D1 in neurofibromatosis 1-associated malignant peripheral nerve sheath tumor(MPNST) cells and promote their proliferation. In this study, we measured the expression of CXCR4, CXCL12, and Cyclin D1 proteins in sporadic MPNST tissues from Chinese patients and investigated their prognostic values.Methods: CXCR4, CXCL12, and Cyclin D1 protein expression in samples from 58 Chinese patients with sporadic MPNST was assessed with immunohistochemical staining.Their prognostic values were evaluated with Kaplan-Meier analysis and a log-rank test. Multivariate Cox regression analysis was used to identify independent prognostic factors.Results: High expression of CXCR4, CXCL12, and Cyclin D1 was observed in 19(32.8%), 32(55.2%), and 16(27.6%)samples, respectively. CXCR4 expression was positively correlated with CXCL12 expression(r = 0.334, P = 0.010) and Cyclin D1 expression(r = 0.309, P = 0.018). Patients with high CXCR4 expression showed longer overall survival than those with low CXCR4 expression(χ~2 = 4.642, P = 0.031).Conclusion: High CXCR4 expression may define a specific subtype of sporadic MPNST with favorable prognosis.展开更多
目的:观察趋化因子配体5(chemokine C-C motif ligand 5,CCL5)、趋化因子CXC配体[chemokine(C-X-C motif)ligand,CXCL]10、CXCL13在创伤性脑损伤(traumatic brain injury,TBI)患者外周血液中的表达变化,分析这些趋化因子对损伤程度和预...目的:观察趋化因子配体5(chemokine C-C motif ligand 5,CCL5)、趋化因子CXC配体[chemokine(C-X-C motif)ligand,CXCL]10、CXCL13在创伤性脑损伤(traumatic brain injury,TBI)患者外周血液中的表达变化,分析这些趋化因子对损伤程度和预后的影响。方法:选取39例重度TBI患者[格拉斯哥昏迷评分(Glasgow coma scale,GCS)3~8分]与13例健康对照者。酶联免疫吸附测定法检测TBI患者术后1、3、7 d和对照组外周血中CCL5、CXCL10、CXCL13蛋白含量;Spearman相关分析对不同时间点外周血中CCL5、CXCL10、CXCL13和入院GCS、术后30 d GCS和格拉斯哥结局量表评分(Glasgow outcome scale,GOS)进行相关性分析。结果:与对照组相比,重度TBI患者外周血液中CCL5、CXCL10、CXCL13的表达量均明显升高(均P<0.05)。重度TBI患者术后1 d血液中CCL5、CXCL13的蛋白浓度与入院GCS评分呈负相关(P<0.05),术后3 d CXCL10的浓度与术后30 d GCS评分呈负相关(P<0.05)。重度TBI患者术后1 d CCL5的蛋白含量、术后1 d和3 d CXCL10蛋白含量及术后7 d CXCL13的蛋白含量与术后30 d GOS评分呈负相关(P<0.05)。结论:趋化因子CCL5、CXCL10、CXCL13在TBI早期表达量迅速增加,且表达量越高,损伤程度越重,预后可能越差。展开更多
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.
基金supported by the National Nature Science Foundation of China(81372872 to Jilong Yang,81672650 to Ze Zhu,and 81402215 to Xiaoling Du)funds from the University Cancer Foundation via the Sister Institution Network Fund(to Jilong Yang)
文摘Background: Recent studies indicate that C-X-C motif chemokine receptor 4(CXCR4) and its ligand, C-X-C motif chemokine ligand 12(CXCL12), stimulate expression of the cell cycle regulatory protein Cyclin D1 in neurofibromatosis 1-associated malignant peripheral nerve sheath tumor(MPNST) cells and promote their proliferation. In this study, we measured the expression of CXCR4, CXCL12, and Cyclin D1 proteins in sporadic MPNST tissues from Chinese patients and investigated their prognostic values.Methods: CXCR4, CXCL12, and Cyclin D1 protein expression in samples from 58 Chinese patients with sporadic MPNST was assessed with immunohistochemical staining.Their prognostic values were evaluated with Kaplan-Meier analysis and a log-rank test. Multivariate Cox regression analysis was used to identify independent prognostic factors.Results: High expression of CXCR4, CXCL12, and Cyclin D1 was observed in 19(32.8%), 32(55.2%), and 16(27.6%)samples, respectively. CXCR4 expression was positively correlated with CXCL12 expression(r = 0.334, P = 0.010) and Cyclin D1 expression(r = 0.309, P = 0.018). Patients with high CXCR4 expression showed longer overall survival than those with low CXCR4 expression(χ~2 = 4.642, P = 0.031).Conclusion: High CXCR4 expression may define a specific subtype of sporadic MPNST with favorable prognosis.
文摘目的:观察趋化因子配体5(chemokine C-C motif ligand 5,CCL5)、趋化因子CXC配体[chemokine(C-X-C motif)ligand,CXCL]10、CXCL13在创伤性脑损伤(traumatic brain injury,TBI)患者外周血液中的表达变化,分析这些趋化因子对损伤程度和预后的影响。方法:选取39例重度TBI患者[格拉斯哥昏迷评分(Glasgow coma scale,GCS)3~8分]与13例健康对照者。酶联免疫吸附测定法检测TBI患者术后1、3、7 d和对照组外周血中CCL5、CXCL10、CXCL13蛋白含量;Spearman相关分析对不同时间点外周血中CCL5、CXCL10、CXCL13和入院GCS、术后30 d GCS和格拉斯哥结局量表评分(Glasgow outcome scale,GOS)进行相关性分析。结果:与对照组相比,重度TBI患者外周血液中CCL5、CXCL10、CXCL13的表达量均明显升高(均P<0.05)。重度TBI患者术后1 d血液中CCL5、CXCL13的蛋白浓度与入院GCS评分呈负相关(P<0.05),术后3 d CXCL10的浓度与术后30 d GCS评分呈负相关(P<0.05)。重度TBI患者术后1 d CCL5的蛋白含量、术后1 d和3 d CXCL10蛋白含量及术后7 d CXCL13的蛋白含量与术后30 d GOS评分呈负相关(P<0.05)。结论:趋化因子CCL5、CXCL10、CXCL13在TBI早期表达量迅速增加,且表达量越高,损伤程度越重,预后可能越差。
