二甲基亚砜对离体大鼠主动脉和肾内动脉的舒张作用及其机制  

Vasodilatory effect of dimethyl sulfoxide on aortic and intrarenal arteries of rats and its mechanisms

作　　者：吴超 杨晓敏 徐小佳 时晓婉 刘宇 张明升 WU Chao;YANG Xiaomin;XU Xiaojia;SHI Xiaowan;LIU Yu;ZHANG Mingsheng(Department of Pharmacology,School of Basic Medicine,Shanxi Medical University,Taiyuan 030001,China)

机构地区：[1]山西医科大学基础医学院药理学教研室,山西太原030001

出　　处：《中国药理学与毒理学杂志》2025年第4期260-267,共8页Chinese Journal of Pharmacology and Toxicology

基　　金：山西省留学回国人员科技活动择优资助项目(20210043)。

摘　　要：目的探讨二甲基亚砜(DMSO)对离体大鼠主动脉和肾内动脉舒张效应及其机制。方法(1)KCl60 mmol·L^(-1)、U466190.3μmol·L^(-1)和PE 3μmol·L^(-1)预收缩大鼠主动脉和肾内动脉,稳定后累积加入DMSO(0.1%、0.3%、1.0%、3.0%和10.0%),采用离体血管张力法记录主动脉和肾内动脉血管张力变化;KCl 60 mmol·L^(-1)、U466190.3μmol·L^(-1)和PE 3μmol·L^(-1)预收缩大鼠肾内动脉,累积加入DMSO(3.0%和10.0%)作为对照组,3种刺激剂预收缩后分别加入电压门控钾离子通道(Kv)抑制剂4-AP 0.5 mmol·L^(-1)孵育15 min,累积加入DMSO(3.0%和10.0%),计算前后DMSO血管舒张百分比。急性分离大鼠肾内动脉平滑肌细胞,采用全细胞膜片钳技术测定累积加入DMSO(0.1%、0.3%、1.0%和3.0%)后的Kv电流。(2)以DMSO 0%(细胞对照)、0.1%、0.3%、1.0%和3.0%分组处理大鼠主动脉平滑肌细胞(A7r5)24 h;采用DCFH-DA荧光探针检测A7r5细胞活性氧(ROS)水平;化学比色法检测A7r5细胞丙二醛(MDA)水平、过氧化氢酶(CAT)活性和超氧化物歧化酶(SOD)活性;JC-1荧光探针检测A7r5细胞线粒体膜电位。结果(1)DMSO(0.1%~10.0%)浓度依赖性地舒张KCl 60 mmol L^(-1)、U466190.3μmol L^(-1)和PE 3μmol L^(-1)预收缩大鼠主动脉和肾内动脉,最大舒张率分别为(42.3±9.7)%、(73.2±8.4)%、(99.2±4.7)%和(84.0±1.9)%、(80.5±6.1)%、(81.2±4.4)%;与对照组相比,Kv抑制剂4-AP显著抑制DMSO对U46619预收缩肾内动脉的舒张作用。(2)低浓度(0.1%和0.3%)DMSO显著增强Kv电流密度,而高浓度(1.0%和3.0%)DMSO显著降低Kv电流密度;高浓度(1.0%和3.0%)DMSO显著提高A7r5细胞ROS水平和MDA水平,显著降低CAT活性、SOD活性和线粒体膜电位。结论DMSO(0.1%~10.0%)对大鼠离体主动脉和肾内动脉具有浓度依赖性舒张作用,其舒张机制与Kv通道、氧化应激和线粒体损伤有关。OBJECTIVE To investigate the vasodilatory effect of dimethyl sulfoxide(DMSO)on isolated aortic arteries and intrarenal arteries of rats and the mechanisms.METHODS①Rat aortas and intrarenal arteries were pre-contracted with KCl 60 mmol·L^(-1),U466190.3μmol·L^(-1) or PE 3μmol·L^(-1).Following equilibration,dimethyl sulfoxide(DMSO)was cumulatively administered at concentrations of 0.1%,0.3%,1.0%,3.0%and 10.0%.Changes in the vascular tension of aortic and intrarenal arterial rings were recorded using an isolated vessel tension measurement system.Rat intrarenal arteries were pre-contracted with KCl 60 mmol·L^(-1),U466190.3μmol·L^(-1) or PE 3μmol·L^(-1).Cumulative additions of DMSO(3.0%and 10.0%)were administered as the control group.Following pre-contraction with each of the three stimulants,the voltage-gated potassium channel(Kv)inhibitor 4-AP(0.5 mmol·L^(-1))was incubated for 15 min.Cumulative additions of DMSO(3.0%and 10.0%)were then administered,and the vascular relaxation percentages induced by DMSO before and after treatment were calculated.Whole-cell patch-clamp recordings were performed on acutely isolated intrarenal arterial smooth muscle cells of rat to assess Kv currents during cumulative DMSO applications(0.1%,0.3%,1.0%and 3.0%).②Rat aortic smooth muscle cells(A7r5)were exposed to DMSO concentration of 0.0%(control),0.1%,0.3%,1.0%and 3.0%for 24 h.Intracellular reactive oxygen species(ROS)levels were detected using the DCFH-DA fluorescent probe.Malondialdehyde(MDA)content,catalase(CAT)activity,and superoxide dismutase(SOD)activity in A7r5 cells were measured by chemical colorimetry.Mitochondrial membrane potential was evaluated using the JC-1 fluorescent probe.RESULTS①DMSO(0.1%-10.0%)dose-dependently relaxed rats aortic and intrarenal arteries pre-contracted with either KCl 60 mmol·L^(-1),U466190.3μmol·L^(-1) or PE 3μmol·L^(-1).The values of maximum relaxation were(42.3±9.7)%,(73.2±8.4)%,(99.2±4.7)%and(84.0±1.9)%,(80.5±6.1)%and(81.2±4.4)%,respectively.Compared with the control gr

关 键 词：二甲基亚砜 主动脉 肾内动脉 血管舒张 电压依赖性钾通道 

分 类 号：R962[医药卫生—药理学]