丹参单体IH764-3通过抑制白细胞激活产物减轻人脑微血管内皮细胞的缺氧-复氧损伤

目的探讨丹参单体IH764-3在白细胞介导的脑内皮细胞缺氧-复氧损伤中的作用及机制。方法通过MTT法检测人脑微血管内皮细胞(HBMVEC)的存活;明胶酶谱法检测白细胞MMP-9的释放;荧光定量法检测白细胞内活性氧水平;ELISA法检测白细胞释放细胞因子的水平。结果缺氧-复氧使HBMVEC存活下降,当复氧时加入白细胞激活产物使损伤加重,同时加入IH764-3则具有保护作用。缺氧-复氧使白细胞释放MMP-9增加;细胞内活性氧水平升高;释放的TNF-α、IL-1α、IL-2、IFN-γ增加。IH764-3可呈剂量依赖性减少由缺氧-复氧所致的白细胞分泌MMP-9、ROS和细胞因子增加。结论IH764-3能够减轻白细胞介导的HBMVEC的缺氧-复氧损伤,在脑缺血前及缺血后干预中具有潜在应用价值。

Salvia miltiorrhiza monomer IH764-3 protects human brain microvascular endothelial cell from hypoxia/reoxygention injury through inhibiting leukocyte activity

Objective To investigate the effect of IH764-3 on the leukocyte-mediated hypoxia-reoxygention injury of human brain microvascular endothelial cell (HBM VEC). Methods MTT assay was used to detect the survival of HBMVEC; gelatin zymography was used to check the activity of MMPs. The level of reactive oxygen species (ROS) in leukocyte was determined via commercially available kit, and the indirect enzyme-linked immunosorbent assay (ELISA) was used to quantify the contents of TNF-α, IL-1α, IL-2 and INF-γ in leukocyte culture medium. Results Survival of HBMVEC was impaired by hypoxia-reoxygenation, which was aggravated by supernatant of activated leukocytes but was attenuated by IH764-3. Leukocytes produced high level of MMP-9, ROS and cytokines (TNF-α, IL-1α, IL-2, IFN-γ) after hypoxia-reoxygenation, the process was inhibited by IH 764-3. Furthermore, IH764-3 could effectively reverse hypoxia-reoxygenation injury of HBMVEC with supernatant of activated leukocytes. Conclusion IH764-3 can protect HBMVEC from leukocyte-involved hypoxia-reoxygenation injury by attenuating the activation of leukocytes and inhibiting the pathogenic effects of leukocytes products.