MR流量测定的实验研究

目的探讨MR流量测量与不同感兴趣区(ROI)直径的关系。方法使用Philips 1.5T双梯磁共振机流量测定程序,测量2mm内径塑胶管中不同流量的水(0.5、1.0、1.5、2.0、2.5ml/s),不同流向(流入及流出方向)、不同ROI位置(测量图中心区和偏中心区)与不同的ROI直径(直径0.5、1.0、1.5、2.0mm)流量变化关系,统计计算标准的ROI直径。结果在不同流量、流向和测量位置中,流量与ROI直径大小存在明显的直线相关(r>0.95,P<0.05),ROI直径大小显著地影响测量结果,当ROI直径取值等于测量图直径的0.6040±0.0480时,所测结果与实际流量一致。在不同流量下的不同流向及ROI位置对流量测定无影响(P>0.05)。结论对直径2mm流量测定,应选取测量图上直径的0.6040±0.0480 ROI进行。     

化疗药物性静脉炎及渗漏损伤的动物实验模型研究概况

化疗药物性静脉炎及渗漏损伤的动物实验模型是研究体内化疗药物性静脉炎及渗漏损伤的发病机制和评价各种治疗方法的重要条件。化疗药物性静脉炎及渗漏损伤的实验研究进展缓慢,其主要原因是缺乏理想的动物模型。依文献报道,化疗药物性静脉炎模型主要以大白兔耳缘静脉注射长春瑞滨等化疗药物为多见,化疗药物渗漏损伤模型主要以大鼠及大白兔背部皮下注射盐酸阿霉素等化疗药物为多见。文章就近年来常用的一些化疗药物性静脉炎及渗漏损伤的动物模型综述如下。     

冬虫夏草对大鼠小剂量环孢素A慢性肾毒性保护作用的实验研究

为进一步探讨冬虫夏草对环孢素Ａ慢性肾毒性的保护作用和机制，将ＳＤ大鼠分为两组：ＣｓＡ大鼠分为两组：ＣｓＡ组和ＣｓＡ＋冬虫夏草组，实验３个组。结果显示：在实验不同时期冬虫夏草组大鼠血Ｃｒ，ＢＵＮ及血清Ｎａ＾＋，Ｋ＾＋均较对照组为低，实验第３月冬虫夏草组鼠血清血管紧张素Ⅱ（ＡＴ－Ⅱ）水平低于对照组；实验不同阶段尿ＥＧＦ排出量亦较对照组为低；肾组织病理形态改变较对照组明显为轻。本实验证明冬虫夏草对ＣｓＡ     

月舒贴药液对原发性痛经的药效研究

通过抑制子宫平滑肌、镇痛及抗炎等试验评价月舒贴药液对原发性痛经的主要功效。结果表明：月舒贴药液有抑制正常大鼠子宫平滑肌收缩频率、幅度的趋势，明显对抗缩宫素所致子宫平滑肌收缩作用，显著抑制冰醋酸对小鼠的致痛作用，明显抑制大鼠足趾部肿胀作用。上述结果提示月舒贴可有效的缓解痛经的症状和体征。     

乌苯美司的药物动力学及对实验性肿瘤转移的治疗作用

目的：探讨乌苯美司对小鼠药物动力学及与实验性肿瘤转移治疗活性间的关系。方法：用放射免疫法测定小鼠在不同给药途径下的乌苯美司血清药物动力学及观察乌苯美司对黑色素瘤肺转移模型的治疗活性。结果：乌苯美司ｉｖ的Ｔ１２较短，初始血药浓度较高。ｉｖ和ｉｍ给药后的曲线下面积较大；ｐｏ及ｉｐ则较小。不同给药途径对实验性肿瘤转移均有治疗作用。结论：乌苯美司的血清Ｔ１２较短，其治疗活性取决于冲击和高剂量的给药方式。     

家犬实验性附睾淤积症及其超声波治疗对附睾起始部超微结构的影响

实验性附睾淤积症引起家犬附睾起始部主细胞超微结构异常改变,但较附睾体部所见为轻;经超声波处理后(功率0.75W/cm~2,每日一次,每次8min,连续7日)则见其明显改变、或完全恢复,且未造成附睾起始部主细胞新的损伤。本实验结果在与附睾体部主细胞相应变化进行比较后,发现由于附睾淤积症对附睾管不同部位的影响是不同的,因而这种形态和功能均已不同程度改变了的附睾不同部位的主细胞对超声波作用的反应也各不相同,这除因主细胞功能状态不同外,尚与超声波声场的不均匀有关,提示探寻超声波治疗最适宜的量不仅必要,而且是有可能找到的。     

The effects of intermittent administration of human parathyroid hormone (1–34) on streptozotocin-induced diabetic rats

Intermittent administration of low doses of human parathyroid hormone (h-PTH) has been reported to exhibit an anabolic effect on bone, increasing its mass. We investigated the effects of intermittent administration of h-PTH on bone changes in streptozotocin- (STZ-) induced diabetes mellitus (DM) rats by measuring bone mineral density and bone mineral contents and by bone histomorphometry. Wistar rats, 7–8 months old, were used. Osteoporosis was induced by diabetes mellitus, which was established by an intraperitoneal injection of STZ. Rats were separated into five groups: sham-injected, baseline control, vehicle-only-administered, and low-dose (6.0μg/kg) or high-dose (60.0μg/kg) h-PTH-administered groups. h-PTH or vehicle was injected subcutaneously six times a week for 4 weeks beginning 9 weeks after STZ administration. Bone mineral density and mineral contents were significantly lower in the baseline control and vehicle groups than in the control group. The PTH-administered groups showed higher values compared with both vehicle and baseline control groups. In bone histomorphometry, both bone volume and bone formation in the STZ group were markedly reduced. The h-PTH-administered rats showed increase in both bone volume and bone formation, which are related parameters, but administration of h-PTH did not alter the extent of eroded surface. Our results suggest that intermittent administration of h-PTH is effective in activating bone formation and in preventing further bone loss in osteoporosis developed by STZ-induced DM.     

大鼠实验性肝硬化时甲状腺激素水平及甲状腺形态学变化的研究

将Wistar大鼠分为三组：肝硬化组，给予四氯化碳等复合因素，给药组，除给CCl4等复合因素外，用赤栀黄合剂灌胃41天；正常组给以一般饮食及饮水。结果，与正常组及给药组相比，硬化组血T3、T4测定值低，甲状腺滤泡中胶质明显减少，滤泡细胞与胶质间空泡增多，滤泡上皮细胞内PAS阳性小滴数日增多。表明在实验性肝硬化期间甲状腺参与了抗疾病的代谢活动，其机理可能是肝硬化时肝细胞合成、转运T3，T4的蛋白质减少。运输中的T3，T4减少，活性甲状腺素不足，从而导致甲状腺代偿性功能活跃。赤栀黄合剂具有保肝，恢复甲状腺素水平的作用。     

中药消结灵抗癌疗效和机理的实验研究

中药消结灵 ,具有扶正培本、清热解毒、理气化瘀 ,软坚散结之功效。临床治疗肝癌患者1 3 0例 ,总缓解率为 72 3 % ,总有效率为 89 2 %。小鼠模型实验 ;抗肝癌实体瘤抑制率为 4 8%～ 70 % ;抗SI80肉瘤抑制率为 3 6%～ 5 1 % ;抗腹水型肝癌生命延长率为 72 2 %～ 75 9% ;抗艾氏腹水癌生命延长率为 73 7%～ 74 9%。超微病理和免疫组化证实 ,消结灵破坏癌细胞的膜系统 ,使其裂解肉溃 ;诱导癌细胞内产生大量溶酶体 ,致使其溶解变性坏死 ;促使癌细胞核仁呈颗粒变性 ,阻碍其分裂增殖 ;激活淋巴细胞增生 ,免疫组化染色T淋巴细胞活性增强 ;刺激枯否细胞数量增加且功能旺盛 ,分泌免疫调节因子破坏癌细胞     

Experimental study of spinal cord compression by epidural tumors using electron probe X-ray microanalysis and confocal laser scanning microscopy

Changes in the nerve fibers of the spinal cord were studied in rat experimental epidural tumor models. Light microscopy showed demyelinization in all with rats paraparesis and paraplegia. Cross-sectional views of nerve fibers stained with 3,3dipentyloxacarbo-cyanine iodide, obtained by confocal laser scanning microscopy, showed distorted, shrunken fibers with a low fluorescence intensity. Changes in the electrolyte contents of nerve fibers were studied by electron probe X-ray microanalysis. The K concentration in axons and the myelin sheath was increased in the paraparesis group, but was decreased in the paraplegia group. These findings suggest that, in the paraparesis group, compression of the spinal cord damaged cell membrane channels, which subsequently caused an increase in intracellular K, a decline in the action potential, and low-intensity fluorescence of nerve fibers. On the other hand, in the paraplegia group, destruction of cell membranes caused a decrease in intracellular K until it approached the extracellular level. This reduced both the action potential and the fluorescence intensity. As Ca and Mg concentrations in both axons and the myelin sheath increased in relation to the severity of neurologic damage, it appears that these electrolytes may also play an important role in damage to nerve fibers.