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重楼甾体总皂苷对血小板聚集的直接诱导作用及初步机制研究 总被引:2,自引:0,他引:2
目的:确定重楼甾体总皂苷(TSSP)体外直接诱导血小板聚集作用并对其可能的机制进行探索.方法:比浊法测定血小板聚集,透射电镜观察血小板形态学改变.结果:体内外血小板聚集模型研究表明,TSSP体内给药能够增强ADP诱导血小板聚集.体外能够直接诱导血小板聚集,并呈剂量效应关系.电镜观察TSSP能够直接激活血小板引起变形释放等反应.肾上腺素能够增强TSSP诱导的血小板聚集,该增强作用能被酚妥拉明所拮抗.蛋白酪氨酸磷酸酶抑制剂过钒酸钠能够增强TSSP诱导血小板聚集.结论:本研究表明,TSSP中含有参与止血作用的药理活性成分. 相似文献
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目的探讨中药保留灌肠治疗急性阑尾炎的临床效果。方法将我院收治的64例急性阑尾炎患者,随机分为对照组和观察组,对照组采用西医对症支持治疗,观察组采用中药保留灌肠治疗。分析两组治疗效果及治疗过程中不良反应发生情况。结果观察组显效率、总有效率显著高于对照组,差异有统计学意义(P〈0.05)。观察组肛门排气时间、肛门排便时间、肠鸣音恢复时间显著早于对照组,差异有统计学意义(P〈0.05)。观察组随访期间复发率显著低于对照组,差异有统计学意义(P〈0.05)。结论中药保留灌肠治疗急性阑尾炎疗效优于西医对症支持治疗,患者治疗后胃肠道功能恢复良好,复发率低,使用方便,值得临床推广应用。 相似文献
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目的 探讨多种细胞因子配伍应用治疗4.5 Gy γ射线照射比格犬造血系统损伤的作用及可能机制。方法 16只比格犬均给予4.5 Gy 60Co γ射线全身照射,随机分为照射对照、综合对症和细胞因子3组。细胞因子组在综合对症支持治疗的基础上应用rhG-CSF、rhIL-11和rhIL-2联合治疗,采用流式细胞术检测外周血中CD34+细胞含量、有核细胞周期及凋亡比例。结果 4.5 Gy γ射线照射犬外周血中CD34+细胞含量在照射后1 d明显下降(照射对照组和综合对症组分别为照前值的61.3%和52.1%),G0/G1期有核细胞比例增加(分别为99.27%和99.49%),且凋亡率(分别为26.93%和21.29%)和坏死率(分别为3.27%和4.14%)明显升高(与照前值比较, P<0.05);而经过细胞因子治疗后,外周血中CD34+细胞含量在照射后1 d即明显升高(为照前值的135.6%),G0/G1期有核细胞比例(99.71%)进一步增加,其凋亡率(5.66%)和坏死率(1.60%)明显低于照射对照和综合对症组。结论 本研究的细胞因子组合可能通过动员骨髓中CD34+细胞到外周血,使细胞周期阻滞在G0/G1期,减少细胞凋亡,从而促进极重度骨髓型急性放射病犬造血功能的恢复。 相似文献
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Therapeutic effects of combined cytokines on hematopoietic injuries induced by 4.5 Gy γ-rays irradiation in beagles
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Objectivc To observe the therapeutic effects of combined cytokines on hematopoietic injuries induced by 4.5 Gy60 Co γ-rays irradiation in beagles,and to provide experimental evidences for the clinical treatment of extremely severe myeloid acute radiation sickness(ARS).Methods 16 beagles were given 4.5 Gy60 Co γ-rays total body irradiation,and then randomly assigned into irradiation control group,supportive care group and cytokines group.In addition to supportive care,recombinant human granulocyte colony-stimulating factor (rhG-CSF),recombinant human interleukin-11(rhIL-11)and recombinant human interleukin-2(rhIL-2)were administered subcutaneouly to dogs in cytokines group.Peripheral blood hemogram was examined once every two days.Bone marrow and peripheral blood were collected to proceed colony cultivation 4 d pre-irradiation and 1 and 45 d post-irradiation.Conventional histopathological sections of sternum were prepared to observe the histomorphology changes. Results After irradiation,the population of all kinds of cells in peripheral blood declined sharply.WBC nadir Was elevated(1.04×109/L,but 0.28×109/L and 0.68×109/L for the irradiation control group and the supportive care group separately),the duration of thrombocytopenia was shortened (24 days,but 33 days for the supportive care groug) and red blood cell counts were maintained in the range of normal values after cytokincs treatment in combination.The colony forming efficiency of haemopoietic stem cells(HSCs)in bone marrow and peripheral blood decreased obviously 1 d post irradiation,but recovered to the level of that before irradiation 45 d post irradiation after supportive care and cytokines treatment.Hematopoietic cells disappeared in bone marrow of animals in irradiation control group,but hematopoietic functions were recovered after cytokines were administrated.Conclusions RhG-CSF.rhIL-11 and rhIL-2 used in combination could elevate WBC nadir,accelerate the recovery of leukocytes,platelets and red blood cells and promote the proliferation,differentiation and maturity of HSPCs left in the body after 4.5 Gy γ-rays total body irradiation,eventually restore the hematopoietic function.Hence,combination of rhG-CSF,rhIL-11 and rhIL-2 could serve as better therapeutic strategy to treat extremely severe myeloid ARS. 相似文献
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Experimental therapeutic effect of combined cytokines on beagle dogs exposed to 4.5 Gy γ-rays
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Objective To evaluate the effects of combined administration of recombinant human interleukin-11(rhIL-11),recombinant human G-CSF(rhG-CSF)and recombinant human interleukin-2 (rhIL-2)on acute radiation sickness(ARS)beagles.Methods Sixteen beagle were irradiated with 4.5 Gy60 Co γ-rays to establish ARS models,and were divided into irradiation control group,supportive care group and combined cytokines treatment group.After irradiation irradiation control group was given no treatment,the dogs in supportive care group received purely symptomatic treatment,while combined cytokines treatment group received rhIL-11 50μg/(kg·d)and rbG-CSF 10μg/(kg·d)subcutaneously(0-14 d)and rhIL-2 1×1 06 U/d(29-43 d)besides symptomatic treatment.Manifestation and characteristics of ARS beagles were observed,and the survival time were recorded.At last,post-mortem examination and histological examination were performed.Results All animals underwent nausea,diarrhea and fever.After irradiation,all animals in irradiation control group died in two weeks,and the mean survival time was 12.7 d,while only one died at 33 d in supportive care group.All dogs in combined cytokine group survived at 45 day after exposure,and their haematopoiesis and gastrointestinal tract were recovered.Conclusions Combination of rhIL-11 + rhG-CSF + rhIL-2 treatment could be significantly effective on ARS beagles irradiated by 4.5 Gy60 Co γ-rays,which could accelerate injured haemotopoiesis and intestinal tract recovery,increase the survival rate and improve the life quality of animals. 相似文献
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Objective To explore the clotting mechanism in beagles irradiated by 4.5 Gy γ-rays after treatment with supportive care,or supportive care and combined cytokines.Methods Sixteen beagles were divided into irradiation control group,Supportive care group and combined cytokines treatment group.Platelet aggregation test,thrombelagtography (TEG) and the time measurement were analyzed in vitro.Results In irradiation group and supportive care group,the platelet aggregation rates in beagles were decreased markedly and the k value of TEG was increased 7 d post-irradiation,while those indexes in combined cytokines treatment group changed little.At 14 d post-irradiation,each parameter of TEG in irradiated group changed obviously.The values of r,k,r+k and M were elevated significantly,clotting time and the maximum coagulation time of thrombus delayed,the Ma value was decreased markedly,and the maximum elasticity amplitude of thrombus was diminished.All parameters in combined cytokines treatment group were better than those in supportive care group.The thrombin time was prolonged obviously in irradiated group 14 d post-irradiation,while the thrombin time was the longest at 2-3 weeks post irradiation in supportive care group and combined cytokines treatment group(P>0.05).Conclusions Cytokines could improve the platelet aggregation and the blood clotting functions of beagles suffering from acute radiation sickness. 相似文献
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本文观察了5例肿瘤患者半身经一次800radx—射线照射后甲襞微循环的观察和照射部位、非照射部位容积脉波的测量,照后6小时和3天,照射部位容积脉波显示微血管舒张,局部组织血流量增加。照后25~35天局部组织血流量明显减少,非照射部位容积脉波出现类似变化,甲襞微循环观察在照后3天显示微血管舒张,血管运动性增强。照后25~35天,微血管管径变细,管袢变短等血管构型的变化。 相似文献
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目的:观察了不同剂量rhIL-6对6.5Gy照射C57BL/6J小鼠外周血细胞恢复的影响。方法:IL-6的剂量分别为10,200,500和1000μg·kg^-1·d^-1,连续给药4天,首次于照后30分钟入,皮下注射,每日两次。照后5,11,14,18,22和30天测定外周血白细胞、血小板和红细胞数量等变化。结果表明:IL-6的4种剂量治疗组外周血细胞数降至最低值时间与对照组相同即:WBC为5天 相似文献
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PLA2/AA信号途径与重楼皂苷诱导大鼠子宫平滑肌收缩活动的关系研究 总被引:1,自引:0,他引:1
目的:探讨宫血宁活性成分--重楼总皂苷(TSSP)诱导大鼠离体子宫肌条收缩的机制,考察PLA2/AA信号途径与TSSP引起的大鼠离体子宫收缩的关系.方法:应用离体子宫张力测定法,观察不同PLA2/AA信号途径抑制剂对TSSP引起的大鼠离体子宫收缩作用的影响.结果:非特异性前列腺素合成酶抑制剂可明显抑制TSSP和米索前列醇引起的子宫收缩,提示二者可能存在相似机制.环氧酶1(COX-1)抑制剂SC560,环氧酶2(COX-2)抑制剂NS-398,EP受体抑制剂AH6809和脂氧酶(5-LO)抑制剂REV5901均可对TSSP缩宫作用产生明显抑制;磷脂酶A2(PLA2)抑制剂AACOCF3也可明显抑制TSSP的缩宫作用,提示PLA2/AA信号途径与TSSP的缩宫作用密切相关.结论:TSSP对大鼠子宫平滑肌收缩活动的调节与PLA2/AA信号途径的激活有关. 相似文献