摘要
目的了解内皮素-1(ET-1)在缺氧性肺动脉高压(HPH)新生大鼠肺组织中的表达变化及其意义。方法将120只Wistar新生大鼠按随机数字表法分为缺氧组和对照组,缺氧组新生大鼠建立HPH模型,分别在缺氧3、5、7、10、14、21d检测平均肺动脉压力(mPAP),观察肺小动脉形态学改变并计算肺血管重塑指标:肺小动脉血管壁中层厚度占外径的百分比(MT%)、肺小动脉中层横截面积占总横截面积的百分比(MA%);通过免疫组织化学和Westernblot法分别进行肺组织ET-1蛋白表达的定性和定量分析。结果1.缺氧3、5、7、10、14、21d,缺氧组mPAP[(8.492±1.548)mmHg、(10.022±1.182)mmHg、(11.470±2.868)mmHg、(16.842±2.154)mmHg、(12.824±2.859)mmHg、(21.036±2.590)ITlmHg;1mmHg=0.133kPa]较对照组[(5.141±1.022)mmHg、(8.137±1.057)mlrlHg、(8.730±0.868)mmHg、(12.125±2.541)mmHg、(8.920±0.744)iTlmHg、(11.156±1.644)inmHg]显著升高,差异均有统计学意义(P均〈0.05)。2.缺氧7d新生大鼠出现肺小动脉重塑改变,缺氧组MT%[(53±11)%]和MA%[(60±9)%]分别高于对照组[(49±11)%、(54±8)%],差异均有统计学意义(P均〈0.05)。3.免疫组织化学结果:缺氧3、5、7d,缺氧组肺血管壁ET.1表达强度(0.614、0.613、0.651)明显高于对照组(0.433、0.386、0.369),差异均有统计学意义(P均〈0.05)。4.Westernblot结果:缺氧3、5、7、10d缺氧组ET-1表达量(4.885±1.391、4.434±1.726、6.309±0.330、2.353_-t-O.961)明显高于对照组(1.698±0.794、1.454±0.776、2.045±0.668、0.766±0.515),差异均有统计学意义(P均〈0.05)。5.相关分析结果:缺氧3—7d总ET-1表达量与该时间总mPAP呈正相关(r=0.459,P〈0.05),而与MT%、MA%,之间均未�
Objective To know about the effect and significance of endothelin-1 (ET-1) in pathogenesis of hy- poxic pulmonary hypertension (HPH)in neonatal rats. Methods The 120 newborn Wistar rats were randomly divided into hypoxic group and control group, and the rats of hypoxic group were made into HPH model. Mean pulmonary arte- rial pressure(mPAP) was measured on day 3,5,7,10,14 and 21 after hypoxia. The morphological change of pulmonary vessels were observed, and pulmonary vascular remodeling indexes were also obtained, including the ratio of middle wall thickness to external diameter of small pulmonary arteries ( MT% ) and the ratio of media cross-section area to total cross-sectional area of small pulmonary arteries( MA% ). Immunohistochemistry and Western blot tests were done to de- termine the expression of ET-1 in lung tissue. Results 1. After hypoxia for 3,5,7,10,14,21 days, the levels of mPAP inhypoxiagroup[(8.492~l.548) mm Hg,(10.022±1.182) mm Hg,(11.470±2.868) mm Hg,(16.842± 2. 154) mm Hg, ( 12. 824 ± 2. 859) mm Hg, ( 21. 036 ± 2. 590) mm Hg; 1 mm Hg = 0. 133 kPa ] were significantly higher than those in control group[ (5. 141 ± 1. 022) mm Hg, (8. 137 ± 1. 057) mm Hg, (8. 730 ±0. 868) mm Hg, (12. 125 ±2.541) mm Hg,(8.920 ±0.744) mm Hg,(ll. 156 ±1.644) mm Hg] (all P〈0.05).2. Seven days after hypoxia exposure,small pulmonary arterials remodeling was observed. MT% [ (53 ± 11 ) % ] and MA% [ (60 ± 9) % ] in hypoxia group were also significantly higher than those in control group [ (49 ± 11 ) %, ( 54 ± 8) % ] ( all P 〈 0.05 ). 3. The results of immunohistochemistry:the expression intensities of ET-1 were significantly higher in hypoxia group (0. 614,0. 613,0. 651) after hypoxia for 3,5,7 days than those in control group(0. 433,0. 386,0. 369) (all P 〈 0.05). 4. The results of Westem blot: the levels of ET-1 were significantly higher in hypoxia group(4. 885 ± 1. 391, 4. 434 ± 1. 726,6.
出处
《中华实用儿科临床杂志》
CAS
CSCD
北大核心
2013年第20期1561-1565,共5页
Chinese Journal of Applied Clinical Pediatrics
基金
国家自然科学基金(30960410)