目的研究丹参多酚酸通过沉默信息调节因子1(silent information regulator protein,SIRT1)/高迁移率蛋白1(high-mobility group box 1,HMGB1)路径改善大鼠脑缺血再灌注损伤的机制。方法选择雄性普通级健康132只SD大鼠,随机分为四组:假手...目的研究丹参多酚酸通过沉默信息调节因子1(silent information regulator protein,SIRT1)/高迁移率蛋白1(high-mobility group box 1,HMGB1)路径改善大鼠脑缺血再灌注损伤的机制。方法选择雄性普通级健康132只SD大鼠,随机分为四组:假手术(Sham)组、模型(IS)组、丹参多酚酸(SA)组、SIRT1特异性抑制剂EX527(EX527)组。采用改良线栓法构建大鼠右侧大脑中动脉栓塞模型,采用改良的神经功能缺损评分(modified Neurological SeverityScores,mNSS)法评估神经功能缺损程度,采用RT-PCR法检测脑组织SIRT1、HMGB1 mRNA含量,Western blot法检测脑组织SIRT1、HMGB1、P-53、NF-κB蛋白的表达,ELISA法检测血清肿瘤抑制基因P-53、核因子-κB(nuclear factor-kappa B,NF-κB)水平,TUNEL法检测脑组织神经细胞凋亡指数。结果(1)与Sham组和EX527组比,SA组mNSS评分明显降低(P<0.05)。(2)7 d SA组HMGB1、P-53、NF-κB蛋白表达均明显低于Sham组和EX527组,EX527组HMGB1、P-53、NF-κB蛋白的表达低于IS组同时显著高于Sham组(P<0.05);SA组SIRT1蛋白表达量显著高于Sham组和EX527组,而EX527组SIRT1蛋白表达量又显著高于Sham组和IS组(P<0.05)。(3)7 d SA组HMGB1mRNA表达均显著低于Sham组、IS组和EX527组,EX527组HMGB1mRNA表达显著高于IS组的同时低于Sham组(P<0.05);SA组SIRT1mRNA表达量显著高于Sham组、IS组和EX527组,EX527组SIRT1mRNA表达量显著高于Sham组、IS组(P<0.05)。(4)7 d SA组大鼠外周血中P-53、NF-κB蛋白表达均显著低于IS组和EX527组,EX527组P-53、NF-κB蛋白的表达显著低于IS组同时高于Sham组(P<0.05)。(5)大鼠脑组组织缺血/再灌注损伤1 d后,SA组神经细胞凋亡指数明显低于Sham组和EX527组(P<0.05),而EX527组神经细胞凋亡指数要显著低于IS组(P<0.05)。结论丹参多酚酸可以通过促进SIRT1转录、抑制HMGB1迁移和表达,减少下游通路的炎症因子P-53、NF-κB的释放,同时抑制神经细胞凋亡,从而减轻大鼠大脑缺血/再灌注损伤。展开更多
Icariin, a flavonoid glycoside, is extracted from Epimedium. This study aimed to investigate the vascular protective effects of icariin in type 1 diabetic rats by inhibiting high-mobility group box 1 (HMGB1)-related i...Icariin, a flavonoid glycoside, is extracted from Epimedium. This study aimed to investigate the vascular protective effects of icariin in type 1 diabetic rats by inhibiting high-mobility group box 1 (HMGB1)-related inflammation and exploring its potential mechanisms. The impact of icariin on vascular dysfunction was assessed in streptozotocin (STZ)-induced diabetic rats through vascular reactivity studies. Western blotting and immunofluorescence assays were performed to measure the expressions of target proteins. The release of HMGB1 and pro-inflammation cytokines were measured by enzyme-linked immunosorbent assay (ELISA). The results revealed that icariin administration enhanced acetylcholine-induced vasodilation in the aortas of diabetic rats. It also notably reduced the release of pro-inflammatory cytokines, including interleukin-8 (IL-8), IL-6, IL-1β, and tumor necrosis factor-alpha (TNF-α) in diabetic rats and high glucose (HG)-induced human umbilical vein endothelial cells (HUVECs). The results also unveiled that the pro-inflammatory cytokines in the culture medium of HUVECs could be increased by rHMGB1. The increased release of HMGB1 and upregulated expressions of HMGB1-related inflammatory factors, including advanced glycation end products (RAGE), Toll-like receptor 4 (TLR4), and phosphorylated p65 (p-p65) in diabetic rats and HG-induced HUVECs, were remarkably suppressed by icariin. Notably, HMGB1 translocation from the nucleus to the cytoplasm in HUVECs under HG was inhibited by icariin. Meanwhile, icariin could activate G protein-coupled estrogen receptor (GPER) and sirt1. To explore the role of GPER and Sirt1 in the inhibitory effect of icariin on HMGB1 release and HMGB-induced inflammation, GPER inhibitor and Sirt1 inhibitor were used in this study. These inhibitors diminished the effects of icariin on HMGB1 release and HMGB1-induced inflammation. Specifically, the GPER inhibitor also negated the activation of Sirt1 by icariin. These findings suggest that icariin activates GPER and increases the expression of Sirt1, which in turn reduces HMGB1 translocation and release, thereby improving vascular endothelial function in type 1 diabetic rats by inhibiting inflammation.展开更多
文摘目的研究丹参多酚酸通过沉默信息调节因子1(silent information regulator protein,SIRT1)/高迁移率蛋白1(high-mobility group box 1,HMGB1)路径改善大鼠脑缺血再灌注损伤的机制。方法选择雄性普通级健康132只SD大鼠,随机分为四组:假手术(Sham)组、模型(IS)组、丹参多酚酸(SA)组、SIRT1特异性抑制剂EX527(EX527)组。采用改良线栓法构建大鼠右侧大脑中动脉栓塞模型,采用改良的神经功能缺损评分(modified Neurological SeverityScores,mNSS)法评估神经功能缺损程度,采用RT-PCR法检测脑组织SIRT1、HMGB1 mRNA含量,Western blot法检测脑组织SIRT1、HMGB1、P-53、NF-κB蛋白的表达,ELISA法检测血清肿瘤抑制基因P-53、核因子-κB(nuclear factor-kappa B,NF-κB)水平,TUNEL法检测脑组织神经细胞凋亡指数。结果(1)与Sham组和EX527组比,SA组mNSS评分明显降低(P<0.05)。(2)7 d SA组HMGB1、P-53、NF-κB蛋白表达均明显低于Sham组和EX527组,EX527组HMGB1、P-53、NF-κB蛋白的表达低于IS组同时显著高于Sham组(P<0.05);SA组SIRT1蛋白表达量显著高于Sham组和EX527组,而EX527组SIRT1蛋白表达量又显著高于Sham组和IS组(P<0.05)。(3)7 d SA组HMGB1mRNA表达均显著低于Sham组、IS组和EX527组,EX527组HMGB1mRNA表达显著高于IS组的同时低于Sham组(P<0.05);SA组SIRT1mRNA表达量显著高于Sham组、IS组和EX527组,EX527组SIRT1mRNA表达量显著高于Sham组、IS组(P<0.05)。(4)7 d SA组大鼠外周血中P-53、NF-κB蛋白表达均显著低于IS组和EX527组,EX527组P-53、NF-κB蛋白的表达显著低于IS组同时高于Sham组(P<0.05)。(5)大鼠脑组组织缺血/再灌注损伤1 d后,SA组神经细胞凋亡指数明显低于Sham组和EX527组(P<0.05),而EX527组神经细胞凋亡指数要显著低于IS组(P<0.05)。结论丹参多酚酸可以通过促进SIRT1转录、抑制HMGB1迁移和表达,减少下游通路的炎症因子P-53、NF-κB的释放,同时抑制神经细胞凋亡,从而减轻大鼠大脑缺血/再灌注损伤。
基金supported by the National New Drug Innovation Program of China(No.2017ZX09301004)the National Natural Science Foundation of China(No.81873131)。
文摘Icariin, a flavonoid glycoside, is extracted from Epimedium. This study aimed to investigate the vascular protective effects of icariin in type 1 diabetic rats by inhibiting high-mobility group box 1 (HMGB1)-related inflammation and exploring its potential mechanisms. The impact of icariin on vascular dysfunction was assessed in streptozotocin (STZ)-induced diabetic rats through vascular reactivity studies. Western blotting and immunofluorescence assays were performed to measure the expressions of target proteins. The release of HMGB1 and pro-inflammation cytokines were measured by enzyme-linked immunosorbent assay (ELISA). The results revealed that icariin administration enhanced acetylcholine-induced vasodilation in the aortas of diabetic rats. It also notably reduced the release of pro-inflammatory cytokines, including interleukin-8 (IL-8), IL-6, IL-1β, and tumor necrosis factor-alpha (TNF-α) in diabetic rats and high glucose (HG)-induced human umbilical vein endothelial cells (HUVECs). The results also unveiled that the pro-inflammatory cytokines in the culture medium of HUVECs could be increased by rHMGB1. The increased release of HMGB1 and upregulated expressions of HMGB1-related inflammatory factors, including advanced glycation end products (RAGE), Toll-like receptor 4 (TLR4), and phosphorylated p65 (p-p65) in diabetic rats and HG-induced HUVECs, were remarkably suppressed by icariin. Notably, HMGB1 translocation from the nucleus to the cytoplasm in HUVECs under HG was inhibited by icariin. Meanwhile, icariin could activate G protein-coupled estrogen receptor (GPER) and sirt1. To explore the role of GPER and Sirt1 in the inhibitory effect of icariin on HMGB1 release and HMGB-induced inflammation, GPER inhibitor and Sirt1 inhibitor were used in this study. These inhibitors diminished the effects of icariin on HMGB1 release and HMGB1-induced inflammation. Specifically, the GPER inhibitor also negated the activation of Sirt1 by icariin. These findings suggest that icariin activates GPER and increases the expression of Sirt1, which in turn reduces HMGB1 translocation and release, thereby improving vascular endothelial function in type 1 diabetic rats by inhibiting inflammation.