摘要
目的探究内皮细胞中香草素受体4型瞬时感受器电位通道(TRPV4通道)与胞浆型磷脂酶A2(c PLA2)在空间上的偶联作用。方法通过设定梯度盐(培养基中外源加入20、40、80、160 mol·L^(-1)Na Cl)确定高盐处理内皮细胞的最适盐浓度;在细胞水平上,通过免疫荧光能量共振转移(immuno-FRET)技术检测人微血管内皮细胞(HMEC)和小鼠胸主动脉原代内皮细胞中TRPV4与c PLA2的空间偶联作用;在动物组织水平,通过同样的技术检测正常小鼠与高盐诱导的高血压小鼠的胸主动脉血管环上的内皮细胞中TRPV4与c PLA2的空间偶联情况。结果高盐诱导内皮细胞的最适盐浓度为40 mol·L^(-1)Na Cl;在细胞水平和动物组织水平上,高盐处理的HMEC、小鼠胸主动脉原代内皮细胞和高盐诱导的高血压小鼠胸主动脉血管环上的内皮细胞中,TRPV4与c PLA2的空间偶联作用均明显增强。结论在细胞和组织水平上,高盐饮食能增强内皮细胞中TRPV4与c PLA2的空间偶联作用,这种空间偶联可能进一步引起两者的功能偶联,为血管内皮功能紊乱的研究提供了新的思路。
Aim To observe the physical coupling between transient receptor potential channel vanilloidtype 4( TRPV4) and cPLA2 in endothelial cells.Methods We investigated the physical association of TRPV4-cPLA2 coupling by immunofluorescence resonance energy transfer( immuno-FRET) to assess the spatial proximity between TRPV4 and cPLA2 in human microvascular endothelial cells( HMEC),primary cultured endothelial cells and in thoracic aortas rings from high salt-induced hypertension mice. Results At the cellular level,with high salt treatment,the physical interaction of TRPV4 and cPLA2 was significantly enhanced in primary vascular endothelial cells andHMEC. Furthermore, in thoracic aortas rings from high salt-induced hypertension mice,we found an increases interaction between TRPV4 and cPLA2 in endothelial cells from arterial segments. Conclusion High-salt treatment increases the endothelial TRPV4-cPLA2 coupling,indicating that this coupling may provide a new target for vascular endothelial dysfunction.
出处
《中国药理学通报》
CAS
CSCD
北大核心
2016年第12期1718-1723,共6页
Chinese Pharmacological Bulletin
基金
国家自然科学基金资助项目(No 91439131)