心钠素对高血压大鼠动脉平滑肌细胞离子泵活性和基因表达的影响 |
| |
引用本文: | 张贵海,商黔惠,姜黔峰,吴泽兵,刘祖林,万卫红.心钠素对高血压大鼠动脉平滑肌细胞离子泵活性和基因表达的影响[J].中华医学杂志,2009,89(40):2862-2866. |
| |
作者姓名: | 张贵海 商黔惠 姜黔峰 吴泽兵 刘祖林 万卫红 |
| |
作者单位: | 1. 遵义医学院临床医学研究所,遵义医学院附属医院心内科,贵州,563003 2. 遵义医学院临床医学研究所,细胞工程重点实验室,贵州,563003 |
| |
基金项目: | 贵州省科学技术基金,贵州省优秀科技教育人才省长专项资金 |
| |
摘 要: | 目的 探讨心钠素(ANP)对自发性高血压大鼠(SHR)动脉平滑肌细胞膜(ASMC)Na+,K+-ATP酶、Ca2+-ATP酶活性及Na+,K+-ATP酶α,亚单位、Ca+-ATP)酶亚型1(PMCA1)mRNA表达的影响.方法 对SHR大鼠,予不同浓度ANP和血管紧张素Ⅱ(Ang Ⅱ)干预,通过放射免疫、生化酶学和逆转录-聚合酶链反应等方法,检测ASMC的ANP、AngⅡ含量,ATP酶活性及其mRNA表达变化并设WKY大鼠为对照.结果 SHR大鼠ANP含量比WKY大鼠下降(7.3±2.4)pg·10-6比(19.3±3.3) Pg·10-6,P<0.01],Ang Ⅱ含量增加(57±4)pg·10-6比(44±4) pg·10-6,P<0.01],Na+,K+-ATP酶、Ca2+-A11)酶活性及Na+,K+-ATP酶α1亚单位、PMCA1 mRNA表达均显著降低Na+,K+-ATP:(4.3±0.8) μmol·h-1·mg-1比(5.3±1.0) μmol·h-1·mg-1,Ca2+-ATP酶:(3.2±0.7)μmol·h-1·mg-1比(4.5±0.7) μmol·h-1·mg-1,α1亚单位:0.524±0.025比0.704±0.116,PMCA1:0.193±0.030比0.547±0.045](P<0.05~P<0.01).ANP可增加SHR大鼠Na+,K+-ATP酶、Ca2+-ATP酶活性及Na+,K+-ATP酶α1,亚单位及PMCA1 mRNA表达(均P<0.01),Ang Ⅱ则抑制Ca2+-ATP酶活性和PMCA1 mRNA表达(P<0.05~P<0.01),仅1×10-7 mol/L AngⅡ抑制Na+,K+-ATP酶活性及α1亚单位mRNA表达,ANP能拮抗AngⅡ对两种ATP酶活性及其mRNA表达的效应.ANP也能拮抗AngⅡ对WKY大鼠Ca2+-ATP酶活性及PMCA1mRNA表达的效应,对Na+,K+-ATP酶活性及α1亚单位mRNA表达无影响(P>0.05).结论 高血压大鼠ASMC两种ATP酶活性和基因表达下降与局部ANP和AngⅡ分泌异常有关,ANP能拮抗AngⅡ对两种ATP酶活性和基因表达的效应.
|
关 键 词: | 高血压 心钠素 腺苷三磷酸酶 基因表达 |
Effects of ANP upon ion pump activity and gene expression in aortic smooth muscle cells from spontaneously hypertensive rats |
| |
Abstract: | Objective To explore the effects of atrial natriuretic peptide (ANP) upon the activities of Na+,K+-ATPase,Ca2+-ATPase and mRNA expression levels of Na+,K+-ATPase α1-subunit and plasma membrane Ca2+-ATPase isoform 1 (PMCAI) in cultured thoracic aortic vascular smooth muscle cells (ASMCs) isolated from spontaneously hypertensive rats (SHR).Methods ASMCs isolated from 14-weekold male SHR and Wistar-Kyoto (WKY) rots were interference-cultured in different doses of ANP and Angiotensin Ⅱ (Ang Ⅱ).The contents of ANP and Ang Ⅱ in supernatant from ASMCs were measured by radioimmunoassay.The activities of the above two ATPases were measured by biochemistry and enzymology.RT-PCR assay was employed to determine the relative levels of Na+,K+-ATPase α1-subunit and PMCA1 mRNA in ASMCs.Results The ANP level of supematant in SHR ASMCs was significantly lower than those from WKY control (7.3±2.4) pg·10-6 cells vs (19.3±3.3) pg·10-6 cells,P<0.01]while the content of Ang Ⅱ in SHR ASMCs was significantly higher than those from WKY control (57±4) pg·10-6 cells vs (44±4) pg·10-6 cells,P<0.01].The activity of Na+,K+-ATPase (4.3±0.8) μmol·h-1·mg-1 vs (5.3±1.0) μmol·h-1·mg-1],Ca2+-ATPase (3.2±0.7) μmol·h-1·mg-1 vs (4.5±0.7) μmol·h-1·mg-1]in ASMCs from SHR were significantly lower than those from WKY control (both P<0.01).The mRNA expression of Na+,K+-ATPase α1-subunit (0.524±0.025 vs 0.704±0.116),PMCAI (0.193±0.030 vs 0.547±0.045) significantly decreased in ASMCs from SHR versus the WKY control (both P<0.01).As compared with SHR control,exogenous ANP improved obviously the activities of Na+,K+-ATPase,Ca2+-ATPase and expression of α1-subunit,PMCA1 mRNA in a does-dependent manner (P<0.05-P<0.01).Exogenous AngⅡ(1×10-9,1×10-8,1×10-7 mol/L) significantly repressed activities of Ca2+-ATPase and attenuated the expression of PMCA1 mRNA (P<0.05-P<0.01).Only AngⅡ(1×10-7 mol/L) significantly inhibited the activity of Na+,K+-ATPase and attenuated the expression of Na+,K+-ATPase α1-subunit mRNA (both P<0.05).ANP antagonized the effects of AngⅡ (1×10-7 mol/L) upon the activities of two ATPases and the expression of Na+,K+-ATPase α1-subunit PMCA1 mRNA (P<0.05-P<0.01).AngⅡ(1×10-7 mol/L) increased the Na+,K+-ATPase activity and the expression of Na+,K+-ATPase α1-subunit mRNA,repressed the Ca2+-ATPase activity and the expression of PMCA1 mRNA in ASMCs from WKY rat (P<0.05-P<0.01).ANP antagonized the effects of AngⅡ(1×10-7 mol/L) upon the activity of Ca2+-ATPase and the expression of PMCA1 mRNA (P<0.05-P<0.01),but did not antagonize the effects of Ang Ⅱ(1×10-7 mol/L) upon the activity of Na+,K+-ATPase and the expression of α1-subunit mRNA in ASMCs from WKY rats (P>0.05).Conclusion The decreased activities of Na+,K+-ATPase and Ca2+-ATPase may be related to the abnormal autocrine of ANP and AngⅡ in ASMC of SHR.ANP can antagonize the effects of Ang Ⅱ upon the activities of two ATPases and the expression of Na+,K+-ATPase α1-subunit PMCA1 mRNA. |
| |
Keywords: | Hypertension Atrial natriuretic factor Adenosinetriphosphatases Gene expression |
本文献已被 万方数据 等数据库收录! |
|