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1.
目的:研究α1受体阻断药与山莨菪碱(Ani)形成的药物组合物改善血栓形成的作用及其分子机制。方法:离体大鼠尾动脉血管模型研究α1受体阻断药及其与山莨菪碱的药物组合物的扩血管效应,角又菜胶诱发小鼠尾部血栓模型研究组合物对抗血栓形成的作用及其机制。结果:α1受体阻断药中哌唑嗪(Pra)对血管环舒张率最大,达(82.6±8.9)%,作用强度最强,Ec50值为O.44μmol/L;山莨菪碱和哌唑嗪分别以不同剂量配伍组成组合物,能使角叉菜胶诱发的鼠尾血栓长度(啪)由24.6±4.6缩短到6.94-2.7,成栓率由86.6%下降到50.0%。上述新药物组合物能显著延长血栓小鼠血浆凝血酶原时间(er),对活化部分凝血活酶时间(APTT)无影响;能抑制血栓小鼠血浆中组织型纤溶酶原激活剂(t-PA)、6-酮一前列腺素F1a(6.Keto.PGF1α)含量的降低和组织纤溶酶原激活剂抑制物-1(PAI-1)、血栓烷B2(TXB2)的增多;并不在于扩血管作用的进一步增强上。结论:山莨菪碱和哌唑嗪组成的药物组合物具有舒张外周血管和改善血栓形成的作用,其抗血栓形成机制分别与影响外源性凝血途径、抑制血小板的活化功能以及促进纤溶功能有关。  相似文献   

2.
目的:明确京尼平苷和京尼平的抗血栓和纤溶的作用效果。方法:用旁路循环血栓形成模型和颈总动脉血栓模型,测定CT、BT、PRT、PT,全血溶栓,计算血栓形成抑制率。结果:试验表明,京尼平苷及其苷元能显著延长凝血、出血时间,减少两个血栓模型的血栓重量,京尼平苷高剂量组与阳性药组相比,溶栓作用具有显著性差异(P<0.05),优于阳性药;京尼平、京尼平苷抗凝血及抗血栓作用与阿司匹林组相比无显著差异(P>0.05)。结论:实验表明中药栀子能延长凝血和出血时间,可能有一定的抗血栓和溶栓作用。  相似文献   

3.
目的:研究银杏叶提取物对血栓模型大鼠血栓形成,血小板聚集及血浆中一氧化氮(NO),环磷酸鸟苷(cGMP)和前列环素(PGI2)的影响.方法:100只SD雄性大鼠随机分为5组,分别ig给予5gL-1的CMC-Na,100mg.Kg-1阿司匹林(Asp),42,21,10.5mg.Kg-1银杏叶提取物连续4w.建立大鼠动静脉旁路血栓模型,观察药物时血栓形成的影响,比浊法观察对ADP诱导的血小板聚集的作用,按试剂盒方法检测药物对血浆中NO,cGMP,PGI2的影响.结果:银杏叶提取物可显著抑制血栓形成和血小板聚集率,升高血浆中NO,cGMP,PGI2浓度,高剂量组效果优于阿司匹林组.结论:银杏叶提取物具有抗血栓作用.  相似文献   

4.
血栓性疾病是临床常见疾病,涉及全身各脏器,其发生与血管损伤、血液成分变化及局部血流淤滞等改变有关.P-选择素作为血小板/内皮细胞活化标志及黏附受体,参与血栓形成起始过程,并是连接炎症与血栓的重要介质和靶分子.为此,进行了以P-选择素为靶标的分子磁共振成像(magnetic resonance imaging,MRI)在血栓早期诊断中的应用研究.利用自制的抗P-选择素单抗(PsL-EGFmAb),制备了具有P-选择素靶特异性的MR对比剂(Gd-DTPA)n-BSA-PsL- EGFmAb,并在体外MR成像基础上,进行了犬静脉血栓模型活体观察.结果显示,该对比剂可明显增强体外模拟血小板血栓和全血血栓的显像信号.进一步发现,相应于P-选择素在建模后即刻犬受损静脉血管内膜及形成的血栓部位表达,模型犬在损伤局部注射对比剂后30 min,MR成像即显示高于周围肌肉显影的血管信号,1 h可见附壁血栓增强信号,至3 h随血栓形成增大而持续强化,显示了与P-选择素表达一致的信号强化效果.另从股静脉损伤部位的远心端注射对比剂后30 min至1 h,也显示上述成像效果,2 h 至4 h血栓信号强度由明显上升渐见趋缓,延迟24 h信号强度减弱.此外,该对比剂对实验犬的生命体征及心、肺、肝、肾等理化指标均无明显影响.研究结果提示,研制的MR对比剂对P-选择素具有靶向特异性,可活体内早期定位显像及反映血栓形成状态,且对机体重要脏器功能无影响,这为早期诊断血栓性疾病提供了一种可行的方法.  相似文献   

5.
组织因子是一种位于细胞膜上的糖蛋白,是外源性凝血过程的关键启动因子,近年来其在肿瘤细胞迁移等其他过程中的重要作用也已逐渐被揭示.构建了融合有His标签的小鼠组织因子胞外区段重组蛋白基因,利用昆虫杆状病毒蛋白表达系统成功表达并得到大量可溶性重组小鼠组织因子.利用血浆凝集实验和鼠尾流血时间实验对此重组小鼠组织因子进行的活性检测表明,此重组蛋白具有良好的生物活性,可以引起血浆凝血或缩短鼠尾流血时间.同时,利用此重组蛋白为抗原,制备了小鼠组织因子的小鼠源功能阻断性单克隆抗体,在血浆凝集实验中证明其对小鼠组织因子的活性有明显抑制作用.利用此阻断性单抗,成功地在小鼠深静脉血栓模型中减轻了血栓形成,证明组织因子在深静脉血栓的病程发展中起重要作用,这也是组织因子阻断性单抗在此类动物模型中的首次成功应用.通过此项工作,成功地建立了大量制备具有良好生物活性的重组小鼠组织因子蛋白的方法,并进而得到了小鼠组织因子功能阻断性单抗,为利用各种小鼠动物模型对组织因子在各项生命活动中的作用进行深入研究奠定了良好的基础.  相似文献   

6.
目的 :建立一种无创性小鼠体内血栓动物模型并应用于多种抗血栓药物的药效观察。方法 :用角叉菜胶建立了小鼠体内血栓动物模型。利用此模型观察潘生丁片 ,抗栓胶囊、复方丹参注射液、川芎嗪注射液对血栓形成的影响。结果及结论 :用角叉菜胶建立的小鼠体内血栓动物模型 ,无创伤性 ,操作简易方便。并可应用于多种抗血栓药物的药效观察 ,剂量的选择 ,药物的筛选。  相似文献   

7.
姜桂荣  吴丹  李佐刚 《生物技术》2004,14(Z1):13-14
目的探讨蝮蛇蛇毒纤溶酶对实验性动物血栓形成的影响.方法采用Chandler氏体外法形成大白鼠体外血栓和家兔半体内血栓,给药组和对照组分别注射蛇毒纤溶酶及相同体积的生理盐水,分别测定两组动物体外形成的血栓重量和长度.结果给药组动物形成的血栓明显小于对照组.结论蝮蛇蛇毒纤溶酶具有抑制血栓形成的作用.  相似文献   

8.
血栓形成是临床疾病中常见的一种病理过程,以血栓形成为基本病理特征的心、脑血管疾病已超过恶性肿瘤,成为威胁人类生命的第一杀手。如何有效防治血栓,也是临床治疗中比较棘手的一个问题。目前对血栓形成的机理还有待进一步阐明。β2糖蛋白I(β2GPI)及其抗体是血栓形成发生发展的重要因素之一,可影响内皮细胞、单核细胞、血小板和纤溶系统,促进血液凝固,导致血栓发生。如果能对β2GPI及其抗体进行有效控制,将有助于防治血栓性疾病。本文就近年来β2GPI及其抗体与血栓形成的相关性研究予以综述,希望能为寻找一种安全有效防治血栓性疾病的新途径提供可能。  相似文献   

9.
血栓形成是癌症患者最常见的并发症之一,也是仅次于癌症本身引起患者死亡的主要因素。癌症患者凝血系统的改变,将会对肿瘤的形成、转移等产生影响。本文通过介绍恶性肿瘤患者并发血栓形成的风险评估以及预防方法,总结恶性肿瘤血栓形成的危险因素及发生机制,探讨临床实践过程中恶性肿瘤血栓形成的风险评估方法和预防措施,为避免或减少血栓的发生提供参考。  相似文献   

10.
刘宝林 《蛇志》1990,2(4):40-41
自从1912年Herriek提出血栓形成在急性心肌梗塞的意义后,三十年来成为传统,经典论著;因为在急性心肌梗塞(AM.I.)的病人尸检中冠状动脉发现血栓,同时冠状动脉发生粥样硬化促使血流在高凝状态下诱发微血栓形成,但在四十年代,有人提出质疑,(1)在心内膜下心梗者只有10%的人发现血栓,在透壁心梗的病人只有50%发现血栓,即有一部分人未发现血栓形成。(2)A..I后注入I.意思为心梗发生在血栓  相似文献   

11.
Using two models of experimental thrombosis (arterio-venous shunt and Wessler's model) the effect of plasmin and its combination with alpha-adrenoreceptor antagonists on the formation of thrombus was studied on white rats. It was established that the efficacy of prophylactic of thrombosis by plasmin only was low: middle ball of thrombosis was 2.5-3.0. The combination of plasmin with alpha-adrenoblockers dihydroergotoxine or prazosin under these conditions is most efficient against the formation of thrombus (middle ball of thrombus in this case was 0.8-1.1). Prazosin under certain conditions have some advantages.  相似文献   

12.
We established three types of thrombosis models to explore the effects of the static magnetic field (SMF) on thrombosis in rats and mice with three different MF intensities. In the carrageenan-induced thrombosis model in rats, the SMF treatments reduced the black tail length of rats, extracorporeal thrombus, and the mass of wet and dry thrombus, and improved the coagulation index value. In FeCl3-induced arterial thrombosis model in rats, the SMF treatment showed some anti-thrombotic effects. More specifically, the SMF treatment affected rodent blood pressure, plasma plasminogen activator inhibitor, tissue-type plasminogen activator, thrombus mass, and thrombus protein content. In the adrenaline-induced thrombosis model in mice, the SMF treatment had certain effects on the diameter and blood flow velocity of mouse auricle microcirculation in fine veins and arteries. Overall, the highest MF intensities we tested, 20–150 mT, showed a trend of anti-thrombotic effect, indicating that the moderate-intensity SMF might serve as a potential treatment for clot-related diseases in the future. Bioelectromagnetics. 2020;41:52–62 © 2019 Bioelectromagnetics Society.  相似文献   

13.
The pharmacodynamics of Annexin32, a new Ca2+-dependent phospholipid-binding protein, was studied by measuring coagulation time in rabbits and venous thrombosis in rabbits and rats. Rabbits and rats were given Annexin32 by intravenous administration. Then Kaolin partial thromboplastin time (KPTT), thrombosis in vitro and in vivo were assayed. The results showed that KPTT of rabbits was prolonged (p < 0.01), and the length and weight of thrombus in vitro were reduced (p < 0.01) after administration of Annexin32 at 1 mg/kg. It also inhibited thrombosis in vivo and reduced the weight of venous thrombus significantly in rats (p < 0.01). All these results suggested that Annexin32 possesses the characteristic of antithrombotic effect and fewer side effects on coagulation time.  相似文献   

14.
The pharmacodynamics of Annexin32, a new Ca2+-dependent phospholipid-binding protein, was studied by measuring coagulation time in rabbits and venous thrombosis in rabbits and rats. Rabbits and rats were given Annexin32 by intravenous administration. Then Kaolin partial thromboplastin time (KPTT), thrombosis in vitro and in vivo were assayed. The results showed that KPTT of rabbits was prolonged (p < 0.01), and the length and weight of thrombus in vitro were reduced (p < 0.01) after administration of Annexin32 at 1 mg/kg. It also inhibited thrombosis in vivo and reduced the weight of venous thrombus significantly in rats (p < 0.01). All these results suggested that Annexin32 possesses the characteristic of antithrombotic effect and fewer side effects on coagulation time.  相似文献   

15.
The purpose of this study was to determine whether gender differences have an effect on inflammation and thrombosis in a rat model of venous thrombosis. A thrombus was created in mature female (n = 12) and male (n = 12) Sprague Dawley rats (Rattus norvegicus) by ligating the inferior vena cava (IVC). The IVC containing the thrombus was harvested at 1 and 3 days postligation, weighed, measured, and submitted for immunohistochemical analysis. In addition, hematology was performed at selected time points. There were no statistically significant differences in thrombus mass (mean +/- 1 standard deviation) between female and male rats at 1 (683 +/- 47.7 x 10(-4) versus 660 +/- 112.0 x 10(-4) g/cm) or 3 (683 +/- 83.3 x 10(-4) versus 580 +/- 86.0 x 10(-4) g/cm) days post-ligation. Females had significantly more platelets than did males on day 1 (741 +/- 37.2 versus 523 +/- 55.1 K/microL, P < 0.01). Day 3 males showed significant increases in vein wall neutrophils (18.0 +/- 2.30 versus 11.2 +/- 1.38, P < 0.05), ED-1-positive monocytes (54.4 +/- 16.0 versus 18.7 +/- 5.63, P < 0.05), and circulating white blood cells (15.4 +/- 0.947 x 10(3) versus 10.9 +/- 0.714 x 10(3)/microL, P < 0.01) at post-thrombosis when compared with females. We conclude that although female rats had greater thrombus mass, the male rats demonstrated more inflammatory cells in circulation and in their vein walls. This finding suggests that inflammation plays a role in thrombus resolution.  相似文献   

16.
Although there are some in vitro evidence that angiotensin II (Ang II) may promote thrombosis, there is still no data concerning effect of Ang II on arterial thrombus formation. In the present study we have investigated the influence of Ang II on electrically induced arterial thrombosis in a common carotid artery of renovascular hypertensive rats. Furthermore, we examined if Ang II effect is mediated via AT1 receptor. We measured some coagulation and fibrinolytic parameters at the same time. Since platelets play crucial role in the initiation of arterial thrombosis their contribution in the mode of Ang II action was also determined. Intravenous infusion of Ang II caused significant increase in arterial thrombus weight, which was reversed by losartan, selective AT1 receptor antagonist. The prothrombotic effect of Ang II was accompanied by increase in haemostatic and decrease in fibrinolytic potential of rat plasma. While number of data has clearly demonstrated that Ang II can augment human platelets aggregation, at least in rats, platelets were not involved in the mechanism of Ang II action. Our study shows that Ang II via AT1 receptor accelerates arterial thrombosis in renovascular hypertensive rat, therefore may be considered as a risk factor of myocardial infarction or stroke.  相似文献   

17.
There are few findings indicating that nicotinamide may potentially influence intravascular thrombosis. Interestingly, N-methylnicotinamide, one of the metabolites of nicotinamide - could be more potent than its parent compound. In the present study we have investigated the influence of N-methylnicotinamide on arterial thrombosis in normotensive and renovascular hypertensive rats. The contribution of platelets, coagulation and fibrinolytic systems in the mode of N-methylnicotinamide action was also determined. Furthermore, we examined the role of nitric oxide/prostacyclin in the mechanisms of N-methylnicotinamide action. N-methylnicotinamide, but not nicotinamide, administered intravenously into renovascular hypertensive rats developing electrically induced arterial thrombosis caused dose-dependent decrease of thrombus weight, collagen-induced platelet aggregation and plasma antigen/activity of plasminogen activator inhibitor - 1, without changing of occlusion time, routine coagulation parameters and plasma activity of tissue plasminogen activator. Indomethacin - an inhibitor of prostacyclin synthesis, completely abolished the antithrombotic and antiplatelet effect of N-methylnicotinamide, and the plasma level of 6-keto-PGF(1alpha) , prostacyclin metabolite, increased simultaneously with the inhibition of thrombus formation. Our study shows that N-methylnicotinamide via production/release of prostacyclin inhibits arterial thrombosis development. The antithrombotic effect of N-methylnicotinamide is accompanied by platelet inhibition and enhanced fibrinolysis, due to the decrease production of plasminogen activator inhibitor - 1.  相似文献   

18.
One hundred and thirty legs of 67 patients were examined 5-10 years after the patient had suffered a phlebographically proved deep-vein thrombosis. Forty-seven of the limbs were normal at the time of the phlebogram, 83 contained thrombus. There was little correlation between the phlebographic severity of the thrombus and the late symptoms and signs: 32% of the legs with no thrombosis had symptoms, while 33% of the legs which had suffered severe thrombosis had no symptoms. Postphlebitic symptoms were more common in legs with aging thrombus at the time of phlebography, but upper limit of the thrombus, the age of the patient, and preexisting symptoms did not affect the incidence of late sequelae. The development of a "postphlebitic leg" does not depend solely on the extent of the initial thrombosis and can apparently develop in the absence of thrombosis.  相似文献   

19.
Serotonin content and accumulation in platelets and its release from them, as well as changes in thrombus formation in mesenteric arterioles and venules of the small intestine have been investigated in control rats and rats with spontaneous hypertension (SHR). Serotonin accumulation in platelets was determined upon its incubation with platelets. Disodium ADP salt was used as an inductor of release. Laser-induced thrombosis was caused by microvessels exposure to impulse laser irradiation. The control animals revealed a significant difference between the initial serotonin platelet level and serotonin level upon incubation and release; in values, the values of basic thrombus-forming parameters were higher than in arterioles. In SHR there is a decrease in biogenic amine content in platelets, a depression in its accumulation and release, an increase in the time of thrombus growth, its size up to the separation of the first embolus and its length along the vascular wall. It is concluded that spontaneous hypertension is characterized by decreased functional activity of platelets and depressed resistance of arterioles and venules to thrombus formation.  相似文献   

20.
沙棘油对实验性血栓形成及凝血系统的影响   总被引:5,自引:0,他引:5  
沙棘油能使实验性血栓形成延迟,具有预防血栓形成的作用。沙棘油有一定的抗凝作用,主要参与内源性凝血系统;且有促纤溶作用,明显降低纤维蛋白原含量,使血浆鱼精蛋白副凝试验呈阳性反应。  相似文献   

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