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1.
目的 :探讨薯蓣皂苷元(Dio)干预对野百合碱(MCT)诱导肺动脉高压(PAH)大鼠影响。方法 :36只大鼠随机分为正常对照组、MCT模型组、肺动脉高压薯蓣皂苷元干预组,检测平均肺动脉压力(m PAP)、右心指数(RV/LV+S)、形态学指标、IL-6及凋亡指数,以观察Dio干预对MCT诱导PAH大鼠的影响。结果 :薯蓣皂苷元干预组m PAP、右心指数、肺小动脉管壁厚度、肺小动脉胶原纤维含量、肺组织匀浆中IL-6水平明显低于MCT模型组,而凋亡指数明显高于MCT模型组。结论 :Dio可能通过抑制肺血管重构、抑制炎症因子和促进肺血管平滑肌细胞凋亡等途径,防治MCT诱导的大鼠PAH。  相似文献   

2.
目的 研究腺苷A2A受体基因敲除小鼠肺动脉压力变化、肺血管重构情况,及慢性低氧环境对其的影响,探讨A2A受体在肺动脉高压发生发展中的调节作用.方法 将A2A受体基因敲除小鼠(KO)及野生型小鼠(WT)随机分为常氧组和低氧组,低氧组置于低氧舱内(O2:9%~10%).2周后检测右心室收缩压(RVSP)、体循环压(SBP)、右心室/左心室加室间隔质量比(右心肥大指数)、肺组织HE染色、弹力纤维染色、透射电镜观察及免疫组化检测肺阻力血管平滑肌细胞肌动蛋白(α-SMA)和增殖细胞核抗原(PCNA)表达情况.结果 常氧环境下,与WT相比A2ARKO小鼠呈现:①RVSP升高,右心肥大指数增加;②肺阻力血管壁增厚,管腔减小;③血管壁PCNA阳性细胞增多,α-SMA表达增强;④肺细小动脉内皮细胞活化,平滑肌细胞、成纤维细胞肥大,胶原纤维大量沉积.低氧2周后,KO小鼠RVSP升高及肺阻力血管重构程度进一步加重.结论 A2AR在肺动脉高压及肺血管重构发生发展过程中起重要的调节作用,慢性低氧可诱导肺动脉高压及肺血管重构进一步加重.  相似文献   

3.
目的:观察低氧诱导因子-1α(HIF-1 α)蛋白和血管内皮生长因子(VEGF)蛋白在低氧性肺动脉高压小鼠肺内的表达,探讨HIF和VEGF在其中的调控作用.方法:建立低氧性肺动脉高压小鼠模型,SPF级雄性C57BL/6小鼠16只,随机分为正常对照组(C组),低氧、高二氧化碳4 w组(H组),每组8只.测二组小鼠的右心室收缩压(RVSP)和右心室重量:比RV/(LV S).光镜下观察右心室和肺组织病理学改变.应用免疫组化技术检测肺细小动脉上HIF-1 α蛋白和VEGF蛋白的表达.结果:H组小鼠RVSP明显高于C组,且RV/(LV S)亦有增加.光镜下肺细小动脉管腔变窄管壁增厚,中膜平滑肌细胞肥大增生.免疫组织化学显示:H组小鼠肺细小动脉HIF-1 α蛋白和VEGF蛋白免疫组化吸光度高于对照组;VEGF蛋白与HIF-1 α蛋白表达呈正相关.结论:慢性低氧使HIF-1 α蛋白和VEGF蛋白在肺细小动脉表达增加,二者参与小鼠肺动脉高压的形成和发展过程.  相似文献   

4.
目的:探讨线粒体ATP敏感性钾通道开放剂(mitoKATPCO)尼可地尔(nicorandil)对大鼠低氧性肺动脉高压的影响?方法:将40只大鼠随机分成对照组(C组)?低氧组(H组)?低氧+尼可地尔组(N组)与低氧+尼可地尔+5-羟基葵酸盐组(HD组),后3组置于常压低氧仓内,每周6 d,每天8 h,持续4周后测定各组大鼠平均肺动脉压(mPAP),右心肥厚指数RV/(V+S),HE染色观察肺小动脉血管壁的病理变化并检测增殖相关抗原(PCNA)?结果:慢性缺氧可诱导大鼠mPAP及RV/(LV+S)升高,大鼠肺小血管增厚重构,PCNA表达增加,尼可地尔可显著抑制上述变化,且该效应可被线粒体KATP(mitoKATP)通道特异性阻断剂5-羟基葵酸盐阻断?结论:尼可地尔通过开放mitoKATP通道降低肺动脉压,拮抗右心肥厚,并抑制肺血管增殖重构,治疗低氧性肺高压?  相似文献   

5.
目的观察不同时期应用辛伐他汀对野百合碱(MCT)诱导大鼠肺动脉高压(PAH)的改善作用,初步评价早期应用辛伐他汀对PAH的预防效果。方法将24只SD大鼠随机分成4组,每组6只。对照组:d_0腹腔注射生理盐水1次;PAH模型组:d_0腹腔注射MCT(50 mg/kg)1次;早期干预组:腹腔注射MCT(50 mg/kg)d–7~d~(–1)辛伐他汀(20 mg·kg~(–1)·d~(–1))灌胃,d_0腹腔注射MCT(50 mg/kg)1次,d1~14辛伐他汀灌胃;后期干预组:d0腹腔注射MCT(50 mg/kg),d15~35辛伐他汀(20 mg·kg~(–1)·d~(–1))灌胃。d_(36)通过右心导管测大鼠右心室收缩压(RVSP)和平均肺动脉压(m PAP),处死大鼠后分离心肺,测定右心室肥厚指数(RVHI)和肺小动脉中膜厚度百分比(WT%),进行肺小动脉周围炎症评分。结果与PAH组比较,早期干预组及后期干预组RVSP、m PAP、RVHI、WT%得到显著改善(P0.01),肺小动脉周围炎症评分降低(P0.05);与后期干预组比较,早期干预组m PAP、RVSP改善更明显(P0.05),WT%下降更显著(P0.01),而RVHI、肺小动脉周围炎症评分无显著差异(P0.05)。结论辛伐他汀早期及后期干预均可改善MCT诱导PAH大鼠RVSP、m PAP及WT%的恶化,早期干预较后期干预效果更显著。  相似文献   

6.
目的了解低氧肺动脉高压时肺内凝血酶敏感蛋白-1(TSP-1)与肺血管重建的关系。方法将30只雄性Wistar大鼠分为正常对照组和低氧肺动脉高压组,肺动脉高压组以常压低氧建立大鼠肺动脉高压模型,以微导管法测定各组大鼠肺动脉压,采用免疫组化法检测各组大鼠肺内TSP-1和TGF-β1的表达,对肺组织切片进行图像分析。结果低氧3周后,低氧肺动脉高压组大鼠形成明显的肺动脉高压,管壁增厚和管腔狭窄,大鼠肺动脉压(2.86±0.39)kPa,右心室肥厚指数〔右心室(RV)/左心室+室间隔(LV+S)〕为(43.53±3.38)%,管壁厚度占外径的百分比(WT%)为(35.24±11.2)%,管壁面积占血管总面积的百分比(WA%)为(55.09±12.38)%,分别与正常对照组〔(1.35±0.28)kPa、(23.68±3.48)%、(23.63±9.74)%和(41.62±12.83)%〕相比升高(P<0.01);肺小动脉TSP-1免疫阳性染色灰度值在低氧肺动脉高压组大鼠为1.32±0.04,与正常对照组(0.96±0.03)相比增强(P<0.01),低氧肺动脉高压组大鼠TGF-β1免疫阳性染色灰度值为1.38±0.05,与正常对照组(1.04±0.04)相比增强(P<0.01)。结论低氧所致TSP-1的合成增多在低氧性肺血管重建和肺动脉高压的发病过程中起一定的作用,其作用可能与活化TGF-β1有关。  相似文献   

7.
目的通过观察慢性低氧所致肺动脉高压对大鼠肺血管平滑肌细胞及成纤维细胞中蛋白激酶CβI(PKCβI)的膜转位和蛋白表达量的影响,初步探讨PKCβI在慢性低氧诱导大鼠肺动脉高压的发生、发展过程中所起的作用。方法建立慢性常压低氧肺动脉高压大鼠模型,将雄性SD大鼠随机分为正常对照组、低氧1 d、3 d、7d、14 d和21 d组,应用蛋白免疫印迹和免疫组化技术检测肺动脉高压形成过程中大鼠肺血管平滑肌细胞及成纤维细胞中PKCβI的膜转位和蛋白表达水平。结果 (1)RVSP和RV/(LV+S)比值较正常对照组明显增加(P<0.05),低氧后3 d、7 d、14 d和21 d后大鼠肺血管明显增厚;(2)大鼠肺血管平滑肌细胞和成纤维细胞均有PKCβI的表达,且低氧14 d后PKCβI的蛋白表达量较正常对照组相比降低(P<0.05)。结论 PKCβI蛋白表达量的下调可能参与了慢性低氧诱导的大鼠肺动脉高压肺血管重塑的发生、发展过程。  相似文献   

8.
杨勇  吕进泉  赵文生 《重庆医学》2012,41(30):3186-3187,3191,3241
目的探讨水飞蓟素对野百合碱(MCT)诱发肺动脉高压大鼠模型肺血管重构的保护作用及机制。方法 24只雄性SD大鼠随机分为正常对照组(C组)、MCT诱发肺动脉高压模型组(M组)、水飞蓟素治疗组(S组),每组8只。28d后,右心导管法测量各组右心室收缩压(RVSP),称量法计算右心室肥大指数(RVHI),HE染色和α-平滑肌肌动蛋白(α-SMA)免疫组织化学染色观察肺血管重构,TUNEL法检测肺动脉平滑肌细胞凋亡,RT-PCR法行肺组织Fas mRNA半定量检测。结果与M组比较,S组RVSP、RVHI、α-SMA表达均降低(P<0.01),肺动脉平滑肌细胞凋亡稍升高,肺组织Fas mRNA表达升高(P<0.05)。结论水飞蓟素对野百合碱诱发肺动脉高压大鼠肺血管重构具有保护作用。  相似文献   

9.
目的 :探讨胰岛素样生长因子 -1受体 (IGF 1R)mRNA在低氧大鼠肺小动脉壁的变化。方法 :采用原位杂交方法检测低氧性肺动脉高压大鼠和正常大鼠肺小动脉壁IGF 1RmRNA的表达 ,用图像分析技术检测肺小动脉的形态改变和半定量技术检测IGF 1RmRNA的表达强度。结果 :低氧性肺动脉高压大鼠肺小动脉管壁增厚、管腔狭窄 ,反映管壁增厚的两个指标MT %和MA %均显著高于正常对照组 (P <0 .0 5 )。正常对照组大鼠肺小动脉壁IGF 1RmRNA有微弱表达 ,低氧组肺小动脉壁IGF 1RmRNA表达呈强阳性 ,低氧组表达强度显著大于正常对照组 (P <0 .0 0 1)。结论 :低氧情况下 ,肺小动脉壁IGF 1RmRNA表达水平与低氧性肺血管重建密切相关  相似文献   

10.
CTGF在低氧性肺血管重建中的作用   总被引:1,自引:1,他引:1  
目的:通过建立低氧性肺动脉高压大鼠模型,探讨结缔组织生长因子(CTGF)在大鼠低氧性肺血管重建中的作用。方法:通过间断常压低氧法建立大鼠低氧性肺动脉高压模型,用右心导管法测定平均肺动脉压(mPAP);称重计算右心室肥厚指数[RV/(LV S)];肺组织切片经HE染色后图像分析技术定量检测大鼠肺小动脉的形态改变;免疫组织化学染色法测定肺小动脉管壁CTGF蛋白表达,并经图像分析半定量检测其表达强度。结果:3周后,低氧组大鼠的mPAP、RV/(LV S)、反映管壁增厚的管壁厚度占血管外径的百分比和管壁面积占血管总面积的百分比两指标均高于正常对照组(P<0.01)。正常对照组大鼠肺小动脉壁CTGF蛋白未表达;低氧组大鼠肺小动脉壁外膜CTGF明显表达,内膜略有表达,中膜几乎无表达。结论:常压低氧3周可成功建立肺动脉高压大鼠模型,CTGF与低氧性肺血管重建密切相关。  相似文献   

11.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

12.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

13.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

14.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

15.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

16.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

17.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

18.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

19.
目的:评价使用安心颗粒对急诊经皮冠状动脉介入术(PPCI)术后生活质量的影响.方法:将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组(术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次)和对照组(仅接受基础药物治疗).所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表(MIDAS)、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果:入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异(P>0.05);出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低(P<0.05);组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低(P<0.05).两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血(P>0.05).两组发生轻度血小板减少症的患者数比较无差异(P>0.05).结论:PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.  相似文献   

20.
Objective To measure Derpl and Blot5 allergen levels in asthmatics' homes in Hongkong.Methods Seventy houses were enrolled for a mite indoor environment study. Dust samples were obtained from two sites of each patients' house: bed and floor. Derpl and Blot5 levels were quantified by a two-site monoclonal antibody-based ELISA technique.Results The levels of Derpl allergens found in bed (geometric mean (GM) 3.43 μg/g of dust; 95%CI, 1.89-4.96 μg/g)and on the floor (GM 1.12 μg/g of dust; 95%CI, 0.71-1.53 μg/g) indicated significant differences (P=0.005). However, the levels of Blot5 allergens found in bed (GM 19.00 μg/g of dust; 95%CI, 0.89-38.90 μg/g) and on the floor (GM 6.14 μg/g of dust; 95%CI, 0.40-11.90 μg/g) showed no statistically significant difference. In addition, in regards to the exposure index for Derpl and Blot5 allergens found in bed and on the floor, 17.6% in bed and 8.6% on the floor had levels of Blot5 ≥ 10 μg/g of dust, higher than those obtained for Derp1 (7.2% and 0% in bed and on the floor respectively, P< 0.05); higher percentages in bed and on the floor (25.0% and 35.7%) were observed for levels of Blot5 =0 μg/g of dust as compared with Derpl in bed and on the floor (4.3% and 14.5% respectively, P< 0.05).Conclusions Derpl and Blot5 are the major allergens found in this regional study, Blot5 is a more potent allergen in Hongkong, probably reflecting the high level of exposure to Blomia tropicalis (Bt). Bt and Dermatophagoides pteronyssinus (Dp) allergens should be included for precise diagnosis and effective immuno-therapeutic treatment of mite allergy in Hongkong.  相似文献   

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