咪苯嗪酮对血小板聚集、血栓形成和血小板环磷酸腺苷含量的影响

本文观察了新型强心剂咪苯嗪酮(CI 914)对血小板聚集、血栓形成和血小板cAMP含量的影响。用比浊法测定CI 914体外抑制AA,ADP和胶原诱导兔血小板聚集的IC_(50)分别为2.6,8.9和15.8μmol;大鼠ivCI 914.25mg/kg能抑制实验性血栓形成,20mg/kg能抑制上述三种诱导剂引起的血小板聚集。在体外,用竞争性蛋白结合法测定,CI-914可使洗涤兔血小板cAMP含量明显升高。CI-914能以剂量依赖方式协同     

咪苯嗪酮对花生四烯酸环氧酶途径代谢产物的选择性影响

兔iv咪苯嗪酮(CI—914)20mg/kg,用RIA法测定其皿浆中TxB_2和6—keto—PGF_(12)含量,给药后30min和60min,6—keto—PGF_(1α)/TxB_2比值显著升高(P<0.05)。在用放射性TLC法进行的洗涤大鼠血小板~(14)C—AA代谢实验中,CI-914在2～500μmol/L范围内以剂量依赖方式抑制大鼠血小板TxB_2生成,IC_(50)为5.15μmol/L,对IIIIT生成的抑制明显弱于对TxB_2生成的抑制作用;在相同剂量范围内,     

3,4-二羟基苯乙酮—一种环加氧酶抑制剂(简报)

3,4-二羟基苯乙酮(DHAP)是从药用植物Ilexpubescns Hook et arn glaber Chang中提出的有效成份,对冠心病心绞痛有较好的疗效。过去的实验结果表明,DHAP可抑制兔血小板聚集和~(14)C-5羟色胺释放反应,同时通过抑制血小板磷酸二酯酶活性增加血小板cAMP水平。此外,DHAP在体外或体内都抑制TXA_2形成。为阐明DHAP对花生四烯酸代谢途径具体作用部位的影响,我们用AA或PGH_2为底物,猪肺微粒体提供酶,用放射免疫分析法测定TXB_2和6-酮-PGF_(1α)含量。结果表明,用     

血栓素B_2放射免疫分析

血栓素A_2(TXA_2)是花生四烯酸(AA)的重要代谢产物之一,具有诱导血小板聚集,降低cAMP水平和收缩血管等作用。在37℃下,性质极不稳定,半衰期仅30秒,很快水解为较稳定的代谢产物TXB_2。虽然测定TXA_2和TXB_2分别可用生物测定和薄层层析,质谱分析等法,但用放射免疫分析法(RIA)不仅特     

血小板内环磷酸腺苷测定方法的改进

3′、5′,环—磷酸腺苷(简称cAMP)是调节机体多种生理功能的重要物质。许多疾病的发生与cAMP有关,特别是血小板内cAMP含量,它不仅影响血小板本身的聚集、释放以及形态的改变,而且还与动脉粥样硬化和血栓形成有着密切联系。因此测定血小板内cAMP水平是了解血小板的生理功能、病理变化和某些药物作用原理的一个重要手段。我们在国内现行测定方法的基础上,对血小板内cAMP的提取进行了较大的玫进。测定结果比较满意。现介绍于下。     

血管紧张素Ⅱ抗阿片作用的可能机制

将含有阿片受体的突触膜片与AII孵育,结果表明,AII即使在10~(-1)～10~(-5)mol/L浓度,亦不能竞争抑制~3H-etorphine与突触膜片的结合。提示AII的抗阿片作用不在受体水平。CA-MP的测定表明,皮下注射吗啡可明显降低脑内cAMP的含量;而脑室注射AII可明显升高脑内cAMP水平。皮下注射吗啡降低脑内cAMP的作用可被脑室注射AII所翻转,使cAMP恢复到正常对照水平。说明AII的抗阿片作用可能通过受体后cAMP水平实现。     

合成消旋丹参素及其衍生物对血小板聚集性和cAMP含量的影响

合成消旋丹参素(简称合成丹参素)及其衍生物(BLA、BLE)在体外实验和体内静脉注射时,对ADP诱导的家兔和大鼠血小板聚集性均有明显的抑制作用。BLK和BLE有较强的促进血小板解聚作用,而合成丹参素较弱。合成丹参索、BLA和BLE在体外实验时,无升高血小板内cAMP作用,反使其cAMP含量下降。提示合成丹参素及其衍生物对血小板功能的作用,不是通过提高cAMP水平;推测可能和抑制血栓素A_2(TXA_2)合成酶有关。     

β环糊精包合血竭对血栓形成和TXB2/6-Keto-PGF1α水平的影响

目的 探讨血竭β环糊精包合血竭对血栓形成作用机制.方法 电刺激大鼠颈动脉血栓形成方法评价包合-PGF1α水平.结果 包合血竭对电刺激大鼠颈动脉引起的血栓有明显的对抗作用,体内外均显著抑制花生四烯酸(AA)诱导的家兔血小板聚集,并降低家兔血浆TXB2含量,升高6-Keto-PGF1α水平.结论 包合血竭抗血栓形成作用与抑制花生四烯酸(AA)代谢有关.     

Y-909对血小板功能的影响

Y-909是已知磷酸二酯酶抑制剂CI-930的类似物。本实验发现Y-909(1O~(-)～10~(-5)M)明显抑制凝血酶诱导的血小板聚集。IC_(50)为1.1×10~(-7)M.用钙的荧光指示剂quin-z标记血小板测胞浆游离钙水平,发现该药(10~(-7)～10~(-4))也抑制凝血酶诱导的胞浆游离钙水平的增加。IC50为1.2×10~(-6)M。抑制钙释放以及钙内流的IG_(50)分别为1.1×10~(-7)和1.4×10~(-6)M。本实验提示Y-909是一种新的血小板功能抑制剂,其抑制血小板聚集的机理与降低血小板胞浆游离钙水平有关。     

人参皂苷Rg1对血小板聚集及环磷腺苷的影响*

[目的]探讨三七活血有效成分人参皂苷Rg1对大鼠血小板聚集的影响。[方法]体外分离大鼠血小板,采用比浊法观察不同浓度Rg1(0.5、1.5、2.5、3、4 mmol/L,)对体外大鼠二磷酸腺苷(ADP)诱导的血小板聚集的抑制作用,以阳性药阿司匹林作为对照;采用酶联免疫(ELISA)法检测Rg1对大鼠血小板环磷腺苷(cAMP)的影响。[结果]0.5 mmol/L人参皂苷Rg1组对血小板聚集无明显影响;阿司匹林组及人参皂苷Rg1(4、3、2.5、1.5 mmol/L)组最大聚集率均明显小于阴性对照组(P<0.01),其抑制率分别为18.95%,59.04%,40.37%,29.77%,9.77%;不同浓度Rg1组对ADP诱导后血小板cAMP的含量与ADP组没有显著性差异。[结论]Rg1可明显抑制ADP诱导的血小板聚集,但其机制并不是通过升高血小板内cAMP含量而抑制血小板激活。     

Value of D-Dimers in patients with acute aortic dissection

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.     

Research of combined liver-kidney transplantation model in rats

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.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

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.     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

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.     

The comparative studies of the influences of Urapidil and Nicardipine on sino-atrial node function, atrio-ventricular node function and hemodynamics

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.     

Expression of OPGmRNA and ODFmRNA in the patients of hip fracture due to osteoporosis

Objective：To investigate the gene expression of osteoprotegerin（OPG） and osteoclast differentiation factor（ODF） in the bone tissue of patients with hip fracture due to osteoporosis. Methods：OPGmRNA and ODFmRNA in the bone tissue in 50 cases of osteoporosis sufferers（over 50 years old） with hip fracture（Observer Group） and 30 cases of hip facture sufferers with no osteoporosis（Control group） were analyzed with the Semi-Quantitative RT-PCR method. Results：The mRNA expressed of ODF, OPG were both high in the patients with hip fracture. In the control group, the expression of OPG mRNA was observed, while the expression of ODF mRNA was very slight. Conclusion：Aged patients contained all signals including OPG, ODF that are essential for inducing osteoclastogenesis and promoting bone resorption.     

The clinicopathological and immuohistochemical analysis of solid-pseudopapillary tumor of the pancreas： report of 9 cases

Objective：To investigate the clinical features, pathological characteristics and immunophenotype of solid-pseudopapillary tumor of the pancreas（SPTP）. Methods：Nine surgically treated cases of SPTP were retrospectively reviewed. Hematoxylin and Eosin（HE） staining and immunohistochemical staining were used to analyze all cases, and the general clinical data was collected. Results：Six patients were asymptomatic except for a palpable mass. Two patients complained of vague-epigastric pain. One patient appeared jaundice. The tumor was encapsulated and solid tissues alternately with cystic tissues. Histologically, the histological structure of solid portion was pseudopapillary with a fibrovascular core. Tumor cells were uniform and medium-sized which were arranged in sheets ets or nests or pseudopapillary patterns. Immunohistochemical studies demonstrated that SPTP proved positive in vimentin（9/9 cases）, AAT（9/9 cases）, NSE（9/9 cases）, ACT（7/9 cases）, CK20（2/9 cases）, CgA（1/9 cases）, S-100（3/gcases）, PR（4/gcases）, Syn（3/9 cases） and CD56（5/9cases）, negative in CEA and ER. Conclusion：SPTP is a tumor predominantly occurring in young women frequently without special symptoms. This tumor has various characteristical histological patterns with different immunophenotype.     

Dynamic Changes in Serum Estradiol and Progesterone levels in Patients of Premenstrual Syndrome with Adverse Flow of Liver-qi

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.     

Real-time Three-dimensional Echocardiography in Assessment of Left Ventricular and Right Ventricular Volumes

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.     

SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

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.