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
目的分析前蛋白转化酶枯草溶菌素9(proprotein convertase subtilisin/kexin type 9,PCSK9)单克隆抗体的全球研究现状、热点及前沿,为我国相关科研工作的开展及临床合理用药提供参考。方法检索2011年1月—2022年2月Web of Science数据...目的分析前蛋白转化酶枯草溶菌素9(proprotein convertase subtilisin/kexin type 9,PCSK9)单克隆抗体的全球研究现状、热点及前沿,为我国相关科研工作的开展及临床合理用药提供参考。方法检索2011年1月—2022年2月Web of Science数据库中收录的PCSK9单克隆抗体相关研究文献,通过可视化文献分析软件(CiteSpace)对纳入研究的文献进行分析。结果共纳入文献723篇,年发文量呈总体上升趋势,发文量排名前3位的国家分别为美国、法国和英国,发文量最多的机构是赛诺菲公司,文献篇均被引最高的机构是布莱根妇女医院;研究的热点内容主要有PCSK9单克隆抗体对高胆固醇血症、不耐受他汀类药物的患者、心血管高风险患者、联合他汀类药物降脂治疗的有效性和安全性;近两年研究的前沿为PCSK9单克隆抗体在急性冠脉综合征患者中的应用以及降低脂蛋白(a)水平后的临床获益。结论PCSK9单克隆抗体降血脂的有效性和安全性已经过大量研究证实,但仍缺乏对其经济性及在特殊人群中的应用研究,未来研究应重点关注。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.
文摘目的分析前蛋白转化酶枯草溶菌素9(proprotein convertase subtilisin/kexin type 9,PCSK9)单克隆抗体的全球研究现状、热点及前沿,为我国相关科研工作的开展及临床合理用药提供参考。方法检索2011年1月—2022年2月Web of Science数据库中收录的PCSK9单克隆抗体相关研究文献,通过可视化文献分析软件(CiteSpace)对纳入研究的文献进行分析。结果共纳入文献723篇,年发文量呈总体上升趋势,发文量排名前3位的国家分别为美国、法国和英国,发文量最多的机构是赛诺菲公司,文献篇均被引最高的机构是布莱根妇女医院;研究的热点内容主要有PCSK9单克隆抗体对高胆固醇血症、不耐受他汀类药物的患者、心血管高风险患者、联合他汀类药物降脂治疗的有效性和安全性;近两年研究的前沿为PCSK9单克隆抗体在急性冠脉综合征患者中的应用以及降低脂蛋白(a)水平后的临床获益。结论PCSK9单克隆抗体降血脂的有效性和安全性已经过大量研究证实,但仍缺乏对其经济性及在特殊人群中的应用研究,未来研究应重点关注。
