医学临床研究
醫學臨床研究
의학림상연구
JOURNAL OF CLINICAL RESEARCH
2014年
3期
437-440,441
,共5页
主动脉%肌%平滑%血管%信号传导
主動脈%肌%平滑%血管%信號傳導
주동맥%기%평활%혈관%신호전도
Aorta%Muscle%Smooth%Vascular%Signal Transduction
【目的】探讨C-型利钠肽(C-type natriuretic peptide ,CNP)对5-羟色胺(5-hydroxytryptamine ,5-H T )诱导的主动脉血管平滑肌细胞收缩的拮抗作用及其机制。【方法】主动脉血管平滑肌A10细胞,采用不同的CNP浓度(10-5~10-9 M )分别作用不同的时间(0 min ,5 min ,10 min ,15 min ,20 min ,30 min)后,采用酶联免疫吸附法(Elisa方法)检测环磷酸鸟苷(cGMP)的含量变化;Western blot 检测CNP刺激后,细胞中蛋白激酶α(PKGIα)和 PKGIβ的蛋白表达变化;共聚焦显微镜观察 CNP拮抗5-HT 诱导的细胞收缩情况。【结果】经过不同浓度的CNP刺激后,平滑肌细胞中cGMP的生成量明显增加,呈浓度依赖性,且在刺激一开始时(5 min) cGMP浓度即开始明显增加,到10 min左右达到高峰。另外,经CNP作用后,cGMP的下游分子cGM P依赖性蛋白激酶(GM P-PKG )被活化,主要表现为PKGIα表达增加;采用PKG特异抑制剂干扰后, CNP对5-HT诱导的主动脉血管平滑肌细胞收缩的拮抗作用减弱。【结论】CNP可活化cGMP-PKGIa信号拮抗5-HT诱导的主动脉血管平滑肌细胞收缩,表明CNP可作为预防治疗动脉粥样硬化治疗的有效靶点。
【目的】探討C-型利鈉肽(C-type natriuretic peptide ,CNP)對5-羥色胺(5-hydroxytryptamine ,5-H T )誘導的主動脈血管平滑肌細胞收縮的拮抗作用及其機製。【方法】主動脈血管平滑肌A10細胞,採用不同的CNP濃度(10-5~10-9 M )分彆作用不同的時間(0 min ,5 min ,10 min ,15 min ,20 min ,30 min)後,採用酶聯免疫吸附法(Elisa方法)檢測環燐痠鳥苷(cGMP)的含量變化;Western blot 檢測CNP刺激後,細胞中蛋白激酶α(PKGIα)和 PKGIβ的蛋白錶達變化;共聚焦顯微鏡觀察 CNP拮抗5-HT 誘導的細胞收縮情況。【結果】經過不同濃度的CNP刺激後,平滑肌細胞中cGMP的生成量明顯增加,呈濃度依賴性,且在刺激一開始時(5 min) cGMP濃度即開始明顯增加,到10 min左右達到高峰。另外,經CNP作用後,cGMP的下遊分子cGM P依賴性蛋白激酶(GM P-PKG )被活化,主要錶現為PKGIα錶達增加;採用PKG特異抑製劑榦擾後, CNP對5-HT誘導的主動脈血管平滑肌細胞收縮的拮抗作用減弱。【結論】CNP可活化cGMP-PKGIa信號拮抗5-HT誘導的主動脈血管平滑肌細胞收縮,錶明CNP可作為預防治療動脈粥樣硬化治療的有效靶點。
【목적】탐토C-형리납태(C-type natriuretic peptide ,CNP)대5-간색알(5-hydroxytryptamine ,5-H T )유도적주동맥혈관평활기세포수축적길항작용급기궤제。【방법】주동맥혈관평활기A10세포,채용불동적CNP농도(10-5~10-9 M )분별작용불동적시간(0 min ,5 min ,10 min ,15 min ,20 min ,30 min)후,채용매련면역흡부법(Elisa방법)검측배린산조감(cGMP)적함량변화;Western blot 검측CNP자격후,세포중단백격매α(PKGIα)화 PKGIβ적단백표체변화;공취초현미경관찰 CNP길항5-HT 유도적세포수축정황。【결과】경과불동농도적CNP자격후,평활기세포중cGMP적생성량명현증가,정농도의뢰성,차재자격일개시시(5 min) cGMP농도즉개시명현증가,도10 min좌우체도고봉。령외,경CNP작용후,cGMP적하유분자cGM P의뢰성단백격매(GM P-PKG )피활화,주요표현위PKGIα표체증가;채용PKG특이억제제간우후, CNP대5-HT유도적주동맥혈관평활기세포수축적길항작용감약。【결론】CNP가활화cGMP-PKGIa신호길항5-HT유도적주동맥혈관평활기세포수축,표명CNP가작위예방치료동맥죽양경화치료적유효파점。
[Objective]To explore the effect of C-type natriuretic peptide (CNP ) on antagonizing 5-hydroxytryptamine(5-HT)-induced aortic smooth muscle cell contraction and its mechanism .[Methods]CNP stimulated A10 aortic smooth muscle cells in vitro by different concentrations (10-5M-10-9M ,respectively ) at different time points(0 ,5 ,10 ,15 ,20 and 30 minutes) .Then enzyme-linked immunosorbent assay(ELISA) was used to detect the changes of cGMP concentration .The expressions of PKGIα and PKGIβ in cells after CNP stimulation were detected by Western blot .The effect of CNP on 5-HT-induced cell contraction was ob-served by confocal microscopy .[Results] The generation of cGMP in smooth muscle cells after CNP treatment was obviously increased in a dose dependent manner ,and markedly increased in the beginning (5min) and reached to the peak around 10min .Meanwhile ,the expression of cGMP downstream molecule ,cGMP-depend-ent protein kinase (PKG ) after CNP treatment was activated which presented the increased expression of PKGIα.After PKG specific inhibitor interfered ,the antagonistic effect of CNP on 5-HT-induced aortic vascu-lar smooth muscle cell contraction was decreased .[Conclusion]CNP can activate cGMP-PKGIa signal against 5-HT-induced aortic vascular smooth muscle cell contraction .It indicates that CNP can be used as an effective target for the prevention and treatment of atherosclerosis .