CAJ | 학술논문

本实验旨在探讨诱导型一氧化氮合酶(iNOS)的激活与血压之间的关系。三组SD大鼠分别静脉输注不同浓度(0.3％, 4％及8%)NaCl溶液以使其处于不同的血压水平。运用同位素标记的L-精氨酸转换成L－Citrulline的转换率变化及Greiss反应, 分别测定不同血压时iNOS的活性及NO的生成量。另四组大鼠包括正常Wistar、正常SD、高盐诱导的高血压(NaHR)及自发性高血压大鼠(SHR), 经测定血压后, 取主动脉血管并以Western印迹杂交法测定其iNOS蛋白水平。结果表明, 血压较低时, SD大鼠iNOS活性基本没有改变, 而在输入4％及8％NaCl并处于较高血压水平的SD大鼠, 其iNOS活性及NO生成均明显升高。此外Western印迹表明, 两种高血压大鼠主动脉组织iNOS蛋白水平均较正常Wistar及正常SD大鼠高, 密度扫描表明, NaHR及SHR主动脉组织iNOS蛋白分别较正常SD大鼠及正常Wistar大鼠升高149％及261％。这一结果提示, 诱导型一氧化氮合酶是血液动力学调控的重要组成部分, 尤其是在血压处于较高水平时, iNOS具有重要的代偿调节作用。除细胞因子、细菌产物等之外, 血压也是调节iNOS表达及活性的重要因素之一。
본실험지재탐토유도형일양화담합매(iNOS)적격활여혈압지간적관계。삼조SD대서분별정맥수주불동농도(0.3％, 4％급8%)NaCl용액이사기처우불동적혈압수평。운용동위소표기적L-정안산전환성L－Citrulline적전환솔변화급Greiss반응, 분별측정불동혈압시iNOS적활성급NO적생성량。령사조대서포괄정상Wistar、정상SD、고염유도적고혈압(NaHR)급자발성고혈압대서(SHR), 경측정혈압후, 취주동맥혈관병이Western인적잡교법측정기iNOS단백수평。결과표명, 혈압교저시, SD대서iNOS활성기본몰유개변, 이재수입4％급8％NaCl병처우교고혈압수평적SD대서, 기iNOS활성급NO생성균명현승고。차외Western인적표명, 량충고혈압대서주동맥조직iNOS단백수평균교정상Wistar급정상SD대서고, 밀도소묘표명, NaHR급SHR주동맥조직iNOS단백분별교정상SD대서급정상Wistar대서승고149％급261％。저일결과제시, 유도형일양화담합매시혈액동역학조공적중요조성부분, 우기시재혈압처우교고수평시, iNOS구유중요적대상조절작용。제세포인자、세균산물등지외, 혈압야시조절iNOS표체급활성적중요인소지일。
The goal of this study was to clarify the relationship between blood pressure and inducible nitric oxide synthase (iNOS) activity. Different levels of blood pressure were obtained by long-term (six days) intravenous infusion of different concentrations (0.3%～8%) of NaCl solution to normal SD rats. iNOS activity assay and measurement of urinary nitrate/nitrite (UNOx), an index of NO production of the whole body, were carried out by isotope-labeled L-arginine convertion rate measurement and Greiss Reaction respectively. Groups of normotensive and hypertensive rats including normal Wistar rats, normal Sprague-Dawley (SD) rats, high NaCl-induced hypertensive rats (NaHR) and spontaneously hypertensive rats (SHR) were used to detect the changes in iNOS protein under normotension and hypertension by Western blotting. iNOS activity of aorta and kidney tissues and UNOx increased more significantly in hypertensive animals than in the normotensive control ones. Accordingly, iNOS protein in the aortas of NaHR and SHR increased by 149% and 261% respectively. It is suggested that in addition to cytokine and bacterial products etc, blood pressure is also an effective regulatory factor involved in iNOS activation and expression.