Following ischemic stroke, blood-brain barrier （BBB） is disrupted and is further aggravated with the corresponding incidence of hyperlipidemia. BBB breakdown promotes inflammation infiltration into the brain, which ...Following ischemic stroke, blood-brain barrier （BBB） is disrupted and is further aggravated with the corresponding incidence of hyperlipidemia. BBB breakdown promotes inflammation infiltration into the brain, which exacerbates cerebral ischemic injury as a result. Here, we report that 10-O-（N,N-dimethylaminoethyl）-ginkgolide B methanesulfonate （XQ-1H） , a novel analog of ginkgolide B, alleviates BBB breakdown in hyperlipidemic rats and protects endothelial cells against inflammatory response. Middle cerebral artery occlusion （MCAO） modeled is- chemic stroke in rats. Before surgery, these rats were fed a cholesterol-rich diet to induce an experimental hyperlip- idemic condition. Additionally, lipopolysaccharide （LPS） incubation with rat brain microvessel endothelial cells （rBMECs） was applied to mimic hyperlipidemia-induced inflammatory injury of BBB. The results indicated more severe infarct size, increased BBB permeability, excessive secretion of pro-inflammatory cytokines, and exaggerated inflammation infiltration of the brain in hyperlipidemic rats following MCAO when compared to rats fed with normal diet. XQ-1H protected BBB integrity, lessoned brain edema and inflammation penetration, down- regulated MMP- 9 and VCMA-1 expressions, and extenuated ischemic infarction. XQ-1H alleviated LPS-induced inflammatory re- sponse in rBMECs, characterized by promoting cell viability, inhibiting TNF-α, IL-1β, and IL-6 releasing, and downregulating NF-KB inflammatory signal and down- stream proteins, such as VCAM-1 and iNOS. In conclusion, the present study shows that XQ-1H stabilizes BBB function following ischemic stroke in hyperlipidemic rats, and the possible mechanisms may be related to inflammation inhibition.展开更多
目的探讨映山红花总黄酮(total flavones of rhododendra,TFR)促大鼠脑血管内皮细胞体外形成血管作用及与VEGFR_(2)和神经源性硫化氢(H_(2)S)的关系。方法采用大鼠脑血管内皮细胞单独培养及和与海马神经元共培养,分别采用不同的实验方...目的探讨映山红花总黄酮(total flavones of rhododendra,TFR)促大鼠脑血管内皮细胞体外形成血管作用及与VEGFR_(2)和神经源性硫化氢(H_(2)S)的关系。方法采用大鼠脑血管内皮细胞单独培养及和与海马神经元共培养,分别采用不同的实验方法检测细胞增殖、迁移、成管及H_(2)S含量和钙离子荧光强度,包括CCK-8法、细胞划痕法、Transwell法、基质胶成管、H_(2)S试剂盒及钙离子荧光探针法。结果在单独培养的大鼠脑血管内皮细胞上,H_(2)S供体NaHS(200μmol·L^(-1))和TFR(90、270、810 mg·L^(-1))对大鼠脑血管内皮细胞的增殖、迁移、成管及[Ca^(2+)]i荧光强度都有明显的促进作用。而VEGFR_(2)阻断剂SU5416(10μmol·L^(-1))可抑制TFR的促进内皮细胞增殖、迁移和形成血管及[Ca^(2+)]i荧光强度;在与海马神经元共培养的大鼠脑血管内皮细胞上,TFR显著地升高共培养中H_(2)S含量,并被CBS抑制剂AOAA(200μmol·L^(-1))抑制。与此同时,TFR明显地促进共培养中大鼠脑血管内皮细胞的形成血管作用,并可被AOAA和VEGFR_(2)阻断剂SU5416显著地抑制。结论TFR在体外可通过VEGFR_(2)升高[Ca^(2+)]i来促进脑血管内皮细胞形成血管,并可通过诱导神经元中CBS生成H_(2)S作用于大鼠脑血管内皮细胞的VEGFR_(2)来促进血管形成。展开更多
文摘Following ischemic stroke, blood-brain barrier （BBB） is disrupted and is further aggravated with the corresponding incidence of hyperlipidemia. BBB breakdown promotes inflammation infiltration into the brain, which exacerbates cerebral ischemic injury as a result. Here, we report that 10-O-（N,N-dimethylaminoethyl）-ginkgolide B methanesulfonate （XQ-1H） , a novel analog of ginkgolide B, alleviates BBB breakdown in hyperlipidemic rats and protects endothelial cells against inflammatory response. Middle cerebral artery occlusion （MCAO） modeled is- chemic stroke in rats. Before surgery, these rats were fed a cholesterol-rich diet to induce an experimental hyperlip- idemic condition. Additionally, lipopolysaccharide （LPS） incubation with rat brain microvessel endothelial cells （rBMECs） was applied to mimic hyperlipidemia-induced inflammatory injury of BBB. The results indicated more severe infarct size, increased BBB permeability, excessive secretion of pro-inflammatory cytokines, and exaggerated inflammation infiltration of the brain in hyperlipidemic rats following MCAO when compared to rats fed with normal diet. XQ-1H protected BBB integrity, lessoned brain edema and inflammation penetration, down- regulated MMP- 9 and VCMA-1 expressions, and extenuated ischemic infarction. XQ-1H alleviated LPS-induced inflammatory re- sponse in rBMECs, characterized by promoting cell viability, inhibiting TNF-α, IL-1β, and IL-6 releasing, and downregulating NF-KB inflammatory signal and down- stream proteins, such as VCAM-1 and iNOS. In conclusion, the present study shows that XQ-1H stabilizes BBB function following ischemic stroke in hyperlipidemic rats, and the possible mechanisms may be related to inflammation inhibition.
文摘目的探讨映山红花总黄酮(total flavones of rhododendra,TFR)促大鼠脑血管内皮细胞体外形成血管作用及与VEGFR_(2)和神经源性硫化氢(H_(2)S)的关系。方法采用大鼠脑血管内皮细胞单独培养及和与海马神经元共培养,分别采用不同的实验方法检测细胞增殖、迁移、成管及H_(2)S含量和钙离子荧光强度,包括CCK-8法、细胞划痕法、Transwell法、基质胶成管、H_(2)S试剂盒及钙离子荧光探针法。结果在单独培养的大鼠脑血管内皮细胞上,H_(2)S供体NaHS(200μmol·L^(-1))和TFR(90、270、810 mg·L^(-1))对大鼠脑血管内皮细胞的增殖、迁移、成管及[Ca^(2+)]i荧光强度都有明显的促进作用。而VEGFR_(2)阻断剂SU5416(10μmol·L^(-1))可抑制TFR的促进内皮细胞增殖、迁移和形成血管及[Ca^(2+)]i荧光强度;在与海马神经元共培养的大鼠脑血管内皮细胞上,TFR显著地升高共培养中H_(2)S含量,并被CBS抑制剂AOAA(200μmol·L^(-1))抑制。与此同时,TFR明显地促进共培养中大鼠脑血管内皮细胞的形成血管作用,并可被AOAA和VEGFR_(2)阻断剂SU5416显著地抑制。结论TFR在体外可通过VEGFR_(2)升高[Ca^(2+)]i来促进脑血管内皮细胞形成血管,并可通过诱导神经元中CBS生成H_(2)S作用于大鼠脑血管内皮细胞的VEGFR_(2)来促进血管形成。
