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1.
目的探讨三味檀香散水提液(ESWTX)对离体大鼠肺动脉血管环的舒张作用。方法采用大鼠离体肺动脉血管环张力记录法,观察ESWTX对去甲肾上腺素(NE)、氯化钾(KCL)引起的肺动脉血管环收缩作用的影响。结果ESWTX能使NE和KCL引起的收缩血管平滑肌的最大收缩反应量效曲线分别下降(P〈0.05),ESWTX对NE和KCL引起的收缩达峰值的离体肺动脉环有舒张作用(P〈0.05)。结论EswTx的作用类似于维拉帕米,具有舒张肺动脉血管平滑肌的作用,其机制可能与拮抗钙离子有关。  相似文献   

2.
目的观察催产素(OT)的血管舒张作用并探讨其可能机制。方法采用大鼠离体血管功能实验装置,描记张力变化,血管按随机数表分组,每组6枚血管环,分别保留或去除内皮,各阻断剂预处理30min之后做OT舒张曲线。结果 OT不能舒张苯肾上腺素(PE)预收缩的内皮完整非孕大鼠血管环。而OT(0.1U-3.2U)浓度依赖性地舒张苯肾上腺素(PE)预收缩的内皮完整或去除内皮的大鼠胸主动脉环。一氧化氮合成酶抑制剂亚硝基左旋精氨酸甲酯(L-NAME)可抑制PE诱导的血管舒张作用(P〈0.01);环氧合酶抑制剂吲哚美辛(Indo)对PE诱导的血管舒张作用无影响。钾通道阻断剂四乙胺(TEA)3mmol/L预处理可减弱OT对内皮完好血管的舒张效应。OT对PE诱导的血管舒张作用与Ca2+浓度无关。结论 OT具有舒张孕鼠血管作用,其机制与NO-cGMP途径和血管平滑肌钾通道有关。  相似文献   

3.
目的:研究千层纸素A对离体大鼠胸主动脉的血管舒张作用及其内皮依赖性作用机制。方法:分离wistar大鼠的胸主动脉,采用离体大鼠胸主动脉环张力测定法检测千层纸素A对1Mmol/L去甲肾上腺素(norepinephrine,NE)或60mmol/L氯化钾预收缩的大鼠离体胸主动脉环的舒张效应,并观察去内皮或用一氧化氮合酶抑制剂N-硝基L-精氨酸甲酯(NG-nitro-Largininemethylester,LNAME)预处理后千层纸素A舒张血管作用的变化。结果:千层纸素A(10、100μmol/L)可以舒张NE(1μmol/L)和氯化钾(60mmol/L)预收缩的内皮完整的离体血管,10、100μmol/L药物浓度组与溶剂对照组比较差异有统计学意义(P〈0.05,P〈0.01);对去内皮血管的舒张作用显著低于内皮完整的血管(P〈0.05,P〈0.01);终浓度为100μmol/L的L—NAME可以显著降低100μmol/L千层纸素A的舒血管作用,加入L—NAME组-9不加入抑制剂组比较差异有统计学意义(P〈0.05,P〈0.01)。结论:千层纸素A可通过内皮依赖的一氧化氮途径发挥舒张血管的作用。  相似文献   

4.
目的:观察混合氧(95%O2和5%CO2)、纯氧、空气三种不同气体供氧对离体血管环收缩和舒张功能的影响。方法:分别以混合氧(95%O2和5%CO2)、纯氧、空气进行供氧对内皮完好的离体大鼠胸主动脉环进行离体灌流实验,观察去甲肾上腺素(NE)诱发的血管环收缩的潜伏期、达峰时间、最大收缩幅度值及乙酰胆碱(Ach)引起的张力下降百分率等四项指标的变化情况,从而推断含氧量不同的三种气体对离体血管环收缩和舒张功能的影响。结果:混合氧与纯氧比较,纯氧组的达峰时间较混合氧组长[(576.40±36.89)sVS(838.00±85.98)s],有显著差异(P<0.01),收缩的潜伏期、最大收缩幅度及张力下降百分比三项观察指标均无统计学意义(P>0.05);混合氧与空气比较,空气组达峰时间较混合氧组长[(576.40±36.89)sVS(866.10±55.18)s],有显著差异(P<0.01),空气组的Ach作用下张力下降百分率较混合氧组低[(41.98±4.95)%VS(48.43±4.32)%],有显著差异(P<0.01),收缩的潜伏期及最大收缩幅度两项指标无统计学差异(P>0.05)。结论:混合氧、纯氧对NE诱发的离体血管收缩反应的潜伏期、最大收缩张力及Ach作用引起的舒血管作用的影响无统计学差异,但纯氧使血管环收缩的达峰时间延长;空气组在延长血管环收缩达峰时间的同时对Ach引起的舒血管作用减弱。  相似文献   

5.
[目的]探讨银杏叶水提取物对大鼠离体胸主动脉环的舒张作用及其机制.[方法]建立大鼠离体主动脉环灌流模型,观察银杏叶水提取物对分别经1μmol/L苯肾上腺素及5-HT预收缩的内皮完整血管环和去内皮血管环的舒张作用,并观察左旋硝基精氨酸甲酯(L-NAME)及亚甲蓝预处理对银杏叶水提取物的舒张血管作用的影响.[结果]银杏叶水提取物对大鼠离体内皮完整的胸主动脉环具有浓度依赖性的舒张作用;L-NAME和亚甲蓝预处理可明显抑制银杏叶水提取物的舒张作用.[结论]银杏叶水提取物对大鼠离体胸主动脉环具有内皮依赖性舒张血管作用,其可能机制是通过血管内皮细胞鸟苷酸环化酶途径介导.  相似文献   

6.
目的 探讨葛根素(puerarin)对溶血磷脂酰胆碱(lysophosphatidylcholine,LPC)损伤家兔血管内皮依赖性舒张功能的影响。方法 采用离体血管环张力实验法检测乙酰胆碱诱导的内皮依赖性舒张反应来评价LPC对血管内皮功能的损害和葛根素的保护作用。结果 分别用2.5~10mg/LLPC孵育血管环30min,出现剂量依赖性抑制乙酰胆碱诱导的内皮依赖性舒张反应。用0.25~1g/L葛根素分别孵育血管环15min,再与5mg/LLPC共同孵育30min,明显改善LPC所致的血管舒张功能的损害。结论 葛根素对LPC所致的血管内皮依赖性舒张功能的损伤具有明显的保护作用。  相似文献   

7.
肾上腺髓质素对大鼠离体血管平滑肌张力作用的影响   总被引:2,自引:0,他引:2  
目的 研究肾上腺髓质素(Adrenomedullin,Adm)对大鼠离体血管平滑肌的影响及其作用机制。方法 大鼠离体胸主动脉血管环张力记录法。结果 Adml—50和降钙素基因相关肽(CGRP)呈浓度依赖的方式抑制苯肾上腺素(Phe)所致的血管环收缩。血管环预先用β1受体抑制剂atenolol(10^-6mol/L)或β2受体抑制剂ICI—118,551(10^-7mol/L)处理后,Adml—50仍能增强血管环对异丙肾上腺素(Iso)所致的舒张反应。此外,Adml—50对磷酸二酯酶抑制剂(rolip-ram)所致的血管舒张反应亦有增强作用,但这种作用在腺苷环化酶激动剂(forskolin)存在的条件下被抑制。结论 Adml—50是一种强血管舒张因子。其舒张血管平滑肌的机制与活化腺苷环化酶,增加细胞内cAMP,进而激活β受体有关。  相似文献   

8.
目的:观察逍遥软胶囊总挥发油及当归、薄荷单味药材挥发油对sD大鼠离体胸主动脉环的作用。方法:采用大鼠离体胸主动脉环灌流,静息张力2.5g,观察总挥发油及当归、薄荷单味药材挥发油对氯化钾(KC1)或苯肾上腺素(PE)预收缩的作用。结果:总挥发油能明显舒张由KC1、PE预收缩的大鼠主动脉环,其血管舒张作用并不依赖血管内皮,0.01%总挥发油最大舒张分别达95.8%±2.3%、55.5%±4.0%。终浓度0.01%当归挥发油、0.01%薄荷挥发油也均能抑制KC1和PE诱导血管环的收缩,但作用强度有不同,对KC1预收缩舒张分别为84.7%±3.9%、27.3%±4.6%,对PE预收缩的舒张分别为52.0%4±3.2%、47.8%±3.1%。结论:逍遥软胶囊总挥发油及当归、薄荷单味药材挥发油对离体血管环具有舒张作用。  相似文献   

9.
《延边医学院学报》2018,(2):101-103
[目的]研究扛板归乙醇提取物(EPP)对大鼠离体血管功能的影响及其机制.[方法]制作大鼠离体胸主动脉血管环标本,观察EPP(0.1~100.0mg/L)对内皮完整和去内皮的大鼠离体胸动脉血管舒张作用的影响,并探讨作用机制.[结果]EPP剂量依赖性地舒张PE(1.0μmol/L)预收缩的内皮完整的血管环,而内皮去除、L-NAME和ODQ预处理可显著抑制EPP对血管环的舒张效应(P<0.05);维拉帕米、吲哚美辛、格列本脲及TEA预处理不能抑制EPP诱导的内皮完整血管环的舒张作用(P>0.05).[结论]EPP具有内皮依赖性血管舒张作用,其机制认为可能与NO-cGMP途径有关系.  相似文献   

10.
目的:探讨离体SD大鼠主动脉对一定浓度胰岛素的反应性改变及其主要机制.方法:采用血管环灌流装置,对比观察离体SD大鼠胸主动脉环在内皮存在条件下,由去甲肾上腺素(NE)引发收缩后,未加干预或施加干预(L-NAME或5-HD抑制剂处理)对Ins反应的变化.结果:Ins(120 U/L)对NE引发收缩后的离体SD大鼠胸主动脉环具有舒张作用,血管舒张率为:(24土8)%,P<0.01,用L-NAME或5-HD抑制剂处理后,Ins对离体SD大鼠胸主动脉环的舒张作用明显减弱,血管舒张率分别为:(9土3)%和(14土5)%,P<0.01.结论:Ins对离体SD大鼠胸主动脉环具有舒张作用,L-NAME或5-HD可阻断该舒张反应,故考虑Ins介导的血管舒张反应主要是内皮或NO依赖的舒张反应,少部分舒张反应是通过诱导mitoKATP通道开放来实现的.  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.
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   

20.
ANTI-PROLIFERATION EFFECT OF ORIDONIN ON HL-60 CELLS AND ITS MECHANISM   总被引:4,自引:0,他引:4  
Objcetive To investigate the anti-proliferation effect of oridonin on leukemic HL-60 cells and its mechanism. Methods HL-60 cells in vitro in culture medium were given different concentrations of oridonin. The inhibitory rate of cells were measured by microculture tetrazolium (MTT) assay, cell apoptotic rate was detected by flow cytometry (FCM), morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the activity of telomerase was detected using telomere repeat amplification protocol (TRAP) PCR-ELISA before and after apoptosis occurred. Results Oridonin could decrease telomerase activity, inhibit growth of HL-60 cells, and cause apoptosis significantly. The suppression was both in time- and dose-dependent manner. Marked morphological changes of cell apoptosis including condensation of chromatin and nuclear fragmentation were observed clearly by hoechst 33258 fluorescence staining especially after cells were treated 48-60 hours by oridonin. Conclusions Oridonin has apparent anti-proliferation and apoptotic effects on HL-60 cells in vitro, decreasing telomerase activity of HL-60 cells may be one of its most important mechanisms. These results will provide strong laboratory evidence of oridonin for clinical treatment of acute leukemia.  相似文献   

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