首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
目的 :探讨大鼠急性坏死性胰腺炎时磷脂酶 A2 (PLA2 )对脑组织的影响。方法 :逆行性胰胆管注射 3 %牛磺胆酸钠建立急性坏死性胰腺炎 (ANP)大鼠模型 ,分为对照组、假手术组、ANP组、ANP治疗组 ,测定各组血中淀粉酶、磷脂酶 A2 及脑组织中磷脂酶A2 ,观察各组脑组织学改变。结果 :假手术组与对照组比较 ,血淀粉酶、磷脂酶 A2 及脑组织中 PLA2 没有显著性差异 ;ANP组与对照组比较 ,血淀粉酶、磷脂酶 A2 及脑组织中 PLA2水平明显升高 ,ANP组有脑膜血管扩张出血 ,脑内小血管充血 ,脑膜、脑实质可见炎细胞浸润 ,间隙增宽 ,二组之间有显著性差异 ;与 ANP组比较 ,ANP治疗组血淀粉酶、磷脂酶 A2及脑组织中 PLA2 水平明显下降。治疗组与 ANP组比较脑组织病理损害明显减轻。结论 :磷脂酶 A2 可能在造成急性坏死性胰腺炎大鼠血脑屏障通透性增高、脑组织损伤中起重要作用。  相似文献   

2.
目的 探讨巨噬细胞移动抑制因子(MIF)在实验性急性坏死性胰腺炎(ANP)肺损伤发病机制中的作用以及ANP早期应用抗炎细胞因子白介素-10(IL-10)对肺组织的保护作用.方法 92只大鼠随机分为对照组、ANP组和lL-10干预组,腹腔注射左旋-精氨酸制作ANP模型,干预组于末次精氨酸注射后第2、5及8h腹腔内注射IL-10 10 ku.各组再分4、12、24和3 h点.观察并比较ANP组与IL-10干预组胰腺、腹腔及肺的大体及组织学改变,检测各组血清MIF水平以及肺组织的MIF表达.结果 ANP时MIF明显升高,应用IL-10干预后各时点血清MIF明显下降(P<0.05).正常对照大鼠肺组织的支气管上皮细胞及肺泡细胞MIF仅为弱表达,ANP时肺组织MIF阳性细胞数增加、染色明显增强,IL-10干预组的肺组织病变程度较ANP组明显减轻.结论 ANP时MIF明显升高,肺组织MIF表达明显增强,提示MIF参与了大鼠ANP相关肺损伤的发病;IL-10对血清及肺组织的MIF水平有抑制作用,可减轻实验性ANP相关肺损伤的损害程度,早期给药对肺组织有保护作用.  相似文献   

3.
骨髓间充质干细胞对肺损伤大鼠的治疗作用   总被引:5,自引:0,他引:5  
目的:观察骨髓间充质干细胞(MSCs)对大鼠肺损伤的治疗作用.方法:将SD大鼠MSCs用DAPI标记后注入受体大鼠体内.将受体大鼠分为4组:肺损伤组、MSCs治疗组、MSCs对照组和正常对照组.2 wk后观察肺组织结构、植入细胞的变化,同时检测支气管肺泡灌洗液中层黏连蛋白、透明质酸以及肺组织羟脯氨酸含量的变化.结果:MSCs治疗组大鼠肺组织中可见少量DAPI标记的细胞,其中部分细胞表达广谱细胞角蛋白,肺间质增生减轻;支气管肺泡灌洗液中层黏连蛋白、透明质酸及肺组织羟脯氨酸的含量在肺损伤组均有明显升高(P<0.01),而在MSCs治疗组均有所下降(P<0.01).结论:MSCs可在损伤的大鼠肺组织中分化为肺泡上皮细胞,降低支气管肺泡灌洗液中层黏连蛋白、透明质酸及肺组织羟脯氨酸的含量,减轻大鼠肺损伤及纤维化的形成.  相似文献   

4.
目的:研究PPAR-γ增殖物激动剂(罗格Yqm)对ANP及合并肺损伤大鼠是否有保护作用.方法:50只健康雄性SD大鼠随机分为5组,正常对照组、假手术组、ANP组、罗格列酮预防组,罗格列酮治疗组.正常对照组,未做任何处理;假手术组,腹腔内注射同等剂量生理盐水;采用大剂量精氨酸腹腔注射诱导ANP模型,预防组于造模前60 min给予罗格列酮10ms/kg,2次,每次间隔30 min,治疗组于造模后60 min给予罗格列酮10 ms/kg,2次,每次间隔30 min.各组于造模后24 h处死大鼠,观察大鼠血清AMY、TNF-α和IL-1β水平变化,同时检测胰腺和肺的组织病理变化和肺组织髓过氧化物酶(MPO)的变化.结果:ANP组AMY、TNF-α、IL-1β和MPO均较对照组和假手术组明显升高(P<0.001);罗格列酮预防和治疗组血清AMY、TNF-α、IL-1β、肺组织中MPO水平较ANP组明显下降,且胰腺和肺的病理损伤也明显减轻(P<0.001)结论:罗格列酮能明显降低ANP的炎症,能明显减少TNF-α、IL-1β的产生,能降低肺组织中MPO含量,对ANP及合并的肺损伤具有保护和治疗作用.  相似文献   

5.
目的:探讨临床剂量异丙酚对大鼠小肠缺血再灌注后肺损伤磷脂酶A2(PLA2)变化的影响及其保护作用.方法:雄性SD大鼠120只,随机分为假手术对照组(Ⅰ组)、小肠缺血再灌注组(Ⅱ组)及给予异丙酚每小时10mg/kg(Ⅲ组),制作小肠缺血再灌注模型.以125I标记白蛋白肺摄取指数作为肺损伤的指标,以髓过氧化物酶活性作为评价多形核中性粒细胞(PMN)在肺组织聚集的指标;实验结束即刻留取肺组织,待测肺组织形态学变化.结果:异丙酚可明显抑制小肠缺血再灌注后肺组织髓过氧化酶(MPO)、PLA2活性升高(P<0.01),降低125I标记白蛋白肺摄取指数(P<0.01);Ⅰ组肺组织结构正常,Ⅱ组可见肺泡压闭实变,腔内有大量渗出,炎性细胞浸润,毛细血管扩张,支气管壁增厚,腔内有渗出,出血;Ⅲ组肺部改变较Ⅱ组明显减轻,除了有少量渗出、肺泡壁稍为增厚、毛细血管轻微扩张外,肺组织结构基本接近正常.结论:PLA2在大鼠小肠缺血再灌注后肺损伤中有重要作用,临床剂量异丙酚可明显降低肺组织内PLA2活性增高,改善肺毛细血管通透性改变,产生肺保护作用.  相似文献   

6.
缺血预处理对肝脏缺血再灌注所致急性肺损伤的保护作用   总被引:2,自引:0,他引:2  
目的:观察全肝缺血再灌注后所致急性肺损伤的发病机制及缺血顸处理的保护作用.方法:通过脾静脉-股静脉转流建立大鼠全肝缺血再灌注模型.18只大鼠随机分3组,全肝缺血40 min再灌注3 h组(IR组);缺血预处理组(IP组),阻断肝脏血流5 min再灌注5 min后,再行全肝缺血40 mjn再灌注3 b;对照组(C组)仅行麻醉及假手术.3 h后检测各组肺泡灌洗液中总蛋白的含量、肺组织含水量以及髓过氧化物酶(MPO)含量和组织及血中丙二醛(MDA)含量.结果:与C组比较,IR组肺泡灌洗液总蛋白含量和肺组织含水量明显升高,而IP组增高不明显.IR组肺组织MPO和MDA及血清中MDA含量明显高于对照组,而预处理可以减少MPO和MDA的升高.结论:肝脏缺血再灌注通过中性粒细胞浸润和氧化应激反应导致急性肺损伤.缺血预处理可以减少粒细胞的浸润,增加抗氧化的能力,减轻肺损伤.  相似文献   

7.
目的探讨ghrelin在大鼠急性坏死性胰腺炎肺损伤中的作用和机制。方法 54只SD大鼠随机分为假手术(SO)组、急性坏死性胰腺炎(ANP)组和ghrelin干预组,采用胰胆管逆行注射5%牛磺胆酸钠诱导大鼠ANP模型,ghrelin干预组于模型制作前30 min和造模后3 h腹腔注射ghrelin,SO组开腹后翻动胰腺后关腹。观察各组大鼠血清淀粉酶的变化,ELISA检测血清肿瘤坏死因子-α(TNF-α),光镜观察胰腺和肺组织的病理改变,Western blot检测肺组织核因子-κB(NF-κB)蛋白的表达,酶化学法测定肺组织髓过氧化物酶(MPO)的变化。结果 ANP组大鼠胰腺和肺组织随着时间延长病变加重;ANP组血清淀粉酶、TNF-α、肺组织MPO均较SO组明显升高(均P〈0.05),表达水平与肺病理严重程度成正相关。ghrelin干预组各检测指标均较ANP组明显降低(均P〈0.05),胰腺及肺组织病理损伤明显减轻。结论 ghrelin可减轻大鼠ANP后的肺损伤,并对MPO和TNF-α有明显的抑制作用,其机制可能与影响了NF-κB的表达,从而干预了炎症信号传导过程有关。  相似文献   

8.
目的研究白藜芦醇甙(PD)对休克大鼠肺损伤的干预机制.方法将休克性肺损伤大鼠随机分为4组:单纯手术组、内毒素休克组、PD预防组和PD治疗组,检测肺系数、肺组织肺通透指数(LPI)、肺泡灌洗液(BALF)中蛋白含量及磷脂酶A2(PLA2)活性,观察肺组织病理切片.结果 PD预防组和治疗组中LPI、BALF中蛋白含量、PLA2较对照组明显降低;PD可明显减轻内毒素休克性肺损伤的程度.结论白藜芦醇甙对大鼠内毒素休克性肺损伤具有保护作用,且预防性用药效果更佳.  相似文献   

9.
[目的]探讨大黄素对大鼠重症急性胰腺炎(SAP)肺损伤的早期保护作用及其机制.[方法]将SD大鼠随机分为假手术组、SAP组及大黄素组,再将每组分为术后4,8,12h亚组,检测各组血浆淀粉酶、肺泡灌洗液磷脂酶A2(PLA2),白细胞介素(IL)-18及IL-6水平,并对肺组织进行病理评分,采用RT—PCR法测定肺组织表面蛋白A(SP—A)mRNA表达,且与细胞因子水平进行相关性分析.[结果]大黄素组血浆淀粉酶、肺泡灌洗液PLA2水平及肺组织病理评分与同时间点SAP组相比较均明显降低(P〈0.05);大黄素组肺泡灌洗液IL-1β,IL-6值与4h时SAP组相比较明显降低(P〈0.05);大黄素组肺组织SP-AmRNA表达水平明显高于SAP组(P〈0.01);肺组织SP—AmRNA表达在4,8h与IL-18,IL-6呈负相关(r=-0.587,P〈0.05).[结论]大黄素通过抑制PLA2活性及降低炎性因子,减轻SAP模型早期肺炎症反应,提示大黄素有良好的肺组织保护作用,改善SAP所致的早期肺损伤.  相似文献   

10.
目的研究非对称二甲基精氨酸(ADMA)在大鼠脑缺血再灌注(I/R)诱导的急性肺损伤发病过程中的作用。方法成年雄性SD大鼠随机分为假手术组(S)、模型组(I/R)、ADMA处理组(ADMA+I/R)和DDAH处理组(DDAH+I/R)。通过大鼠脑缺血2 h后恢复血流灌注诱导急性肺损伤。在恢复血流灌注24 h后,采用比色法检测各组大鼠肺组织一氧化氮合酶(NOS)活性和NO含量。采用RT-PCR和Western blotting分别检测肺组织蛋白激酶(PKC)和肌球蛋白轻链激酶(MLCK)mRNA和蛋白表达水平;ELISA法检测支气管肺泡灌洗液及入肺血和出肺血血浆中的ADMA水平。结果脑I/R损伤大鼠支气管肺泡灌洗液和入肺血血浆中ADMA水平明显升高,肺组织中NO含量和NOS活性明显降低(P<0.05),同时MLCK和PKC mRNA和蛋白表达明显上调(P<0.05)。预先给予外源性DDAH后,脑缺血/再灌注损伤大鼠支气管肺泡灌洗液和入肺血血浆中ADMA水平明显降低,肺组织NO含量和NOS活性明显升高,MLCK和PKC mRNA和蛋白表达明显下调(P<0.05)。结论 ADMA通过上调肺组织MLCK和PKC的表达参与了脑I/R损伤后急性肺损伤的发病过程。ADMA可能是脑缺血/再灌注损伤诱导急性肺损伤的一个新的生物标志物和治疗靶点。  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 investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P<0.01);the MAP decreased(P<0.01)and the HR increased drastically(P<0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号