重组人肿瘤坏死因子受体融合蛋白诱导胶原诱导型关节炎大鼠滑膜细胞凋亡的研究

 目的胶原诱导大鼠类风湿性关节炎(CIA)为动物模型,探讨重组人肿瘤坏死因子受体融合蛋白(rhTNFR:Fc)对CIA滑膜细胞凋亡的影响。方法Wistar大鼠模型随机分组,rhTNFR:Fc组和甲氨喋呤(MTX)阳性对照组按1.75mg·kg^-1剂量每日皮下注射给药,阴性对照组和正常对照组皮下注射等量生理盐水,31d后抽取膝关节滑液以ELISA法测定TNF-α水平;膝关节滑膜作苏木素-伊红染色(HE)、电镜、缺口末端标记法(TUNEL)标记检测凋亡。结果电镜下可见早期滑膜凋亡细胞,MTX组和rhTNFR:Fc组滑膜细胞凋亡数与阴性对照组比较明显增加,突变型p53的表达被明显抑制,P<0.05;MTX组和rhTNFR:Fc组膝关节滑液TNF-α、NO水平显著下降,与阴性对照组比较差异具显著性,P<0.01。结论首次阐明rhTNFR:Fc诱导CIA大鼠滑膜细胞凋亡,抗类风湿性关节炎可能通过下调p53,降低TNF-α、NO来诱导滑膜细胞凋亡,减轻CIA大鼠的关节炎症。     

Effect of Feixian Recipe on laminin, collagen I and III in rats with pulmonary fibrosis induced by bleomycin

The aim of this paper is to observe the effect of the Feixian Recipe on pulmonary fibrosis in rats. A rat model with pulmonary fibrosis was established by intratracheal injection of bleomycin. On days 14, 28 and 45, the contents of laminin, collagen I and collagen III in lung tissue homogenate in the model group, the sham operated group, the Feixian group and the prednisone group were measured. The contents of laminin and collagen I and III were decreased significantly by the Feixian Recipe. Feixian Recipe has a significant therapeutic effect on bleomycin-induced pulmonary fibrosis in rats. __________ Translated from Journal of Beijing University of Traditional Chinese Medicine, 2007, 30(9): 608–610 [译自: 北京中医药大学学报]     

Four-week administration of nimesulide, a cyclooxygenase-2 inhibitor, improves endothelial dysfunction in the hindlimb vasculature of streptozotocin-induced diabetic rats

The aim of this study was to examine the effect of chronic administration of nimesulide, a cyclooxygenase-2 inhibitor, on endothelial dysfunction in streptozotocin-induced diabetic rats. Three groups of Sprague-Dawley rats (300–350 g, n = 6) were used. The first group served as normoglycemic control and the second and third groups were rendered diabetic by an intraperitoneal injection of streptozotocin (60 mg/kg). The third group received the selective COX-2 inhibitor, nimesulide (20 mg/kg/day), orally by gavage for 4 weeks while the second group received only drinking water and served as diabetic control. At the end of the treatment period, the rats were anesthetized with urethane (1.2 g/kg) and mean arterial pressure, heart rate and hindlimb blood flow were monitored. This was followed by the injection of acetylcholine (endothelium-dependent vasodilator, 0.1–0.8 μg/kg) and sodium nitroprusside (endothelium-independent vasodilator 1–4 μg/kg). Mean arterial pressure was significantly reduced and hindlimb vascular conductance was not significantly affected in the control diabetic group when compared to the normoglycemic control group. Nimesulide treatment did not cause any significant change in any of the measured hemodynamic parameters. Acetylcholine and sodium nitroprusside induced dose-dependent increases in hindlimb vascular conductance in control normoglycemic rats which were attenuated in diabetic control rats. Nimesulide reversed the attenuation of acetylcholine-induced increase in hindlimb vascular conductance. In conclusion, chronic administration of the selective COX-2 inhibitor, nimesulide improved endothelial dysfunction in the hindlimb vasculature of streptozotocin induced diabetic rats. This suggests that COX-2 products might be involved in the pathogenesis of endothelial dysfunction in streptozotocin-induced diabetic rats.     

参麦注射液对脑出血大鼠缺氧诱导因子1-α表达的影响

目的:研究参麦注射液对脑出血大鼠血肿周围区缺氧诱导因子1-α(Hypoxia inducible factor 1-α,HIF1-α)表达的影响及其意义。方法:将50只SD大鼠随机分为正常组、假手术组、模型组、参麦组4组,模型组和参麦组组内又分为1、3、5、7天共4个时间点,立体定位仪定位注射胶原酶VII造大鼠脑出血模型,观察大鼠脑出血后神经病理体征改变,免疫组织化学法检测血肿周围区HIF1-α的表达,以及参麦注射液治疗后的影响。结果:与模型组相比较,参麦组大鼠神经病理体征减轻明显(P<0.01);正常组和假手术组脑组织神经细胞无HIF1-α表达,而模型组血肿周围区HIF1-α的表达1天时增多,3天时达到高峰,5天时表达下降,至7天时仍有少量表达,与模型组相比较,参麦组各时间点的HIF1-α表达要少,二者有显著性差异(P<0.01)。结论:参麦注射液可能通过促进血肿吸收、抑制血肿周围区HIF1-α表达而发挥神经保护作用。     

科技动态

目的初步探讨大龄雄性F344大鼠自发性不育症与精子参数、生精细胞及精子核成熟度之间的关系。方法4、7、10、13月龄雄性F344、SD、Wistar大鼠分别记为A1、A2、A3、A4组,B1、B2、B3、B4组,C1、C2、C3、C4组,测定各组精子参数、生精细胞和精子核成熟度并与A4组作比较。结果A4组精子存活率除了与A3组无统计学差异(P≥0.05)外,显著低于其它组(P<0.01);其精子畸形率不仅高于C1组(P<0.05),且显著高于其它组(P<0.01);其精子活动力a级和b级均显著低于其它组(P<0.01);其精子核苯胺蓝染色 率显著高于其他组(P<0.01),阴性率显著低于其他组(P<0.01)。结论精子存活率减少、畸形率高、活动力低下、核成熟度异常可能是大龄雄性F344大鼠生殖力明显下降或自发性不育症的病因。     

中药养胃散对大鼠胃肠黏膜中前列腺素、生长抑素及促胃动素的促分泌作用

目的 观察中药养甲散对实验动物用药后胃肠黏膜中前列腺素（PG），生长抑素（SS），促胃动素（MTL）的变化规律。方法 实验用60只大鼠禁食12h，随机分为3组：吲哚美辛＋养胃散组（n=20），吲哚美辛＋生理盐水组（n=20），生理盐水组（n=20）。实验组均给予吲哚美辛0．02g／100g体重灌胃，每日2次，共2d，制作胃肠黏膜损伤模型，对照组给予等量生理盐水。然后给予相应制剂1ml／100g体重灌胃每日2次，10d，放射免疫法测定胃及十二指肠黏膜PG，SS，MTL的含量。结果养胃散能明显增加吲哚美辛损伤后的胃及十二指肠黏膜中PG，SS，MTL的含量，与吲哚美辛组相比有显著性差异（P〈0．05）。结论 中药养胃散能增加胃肠黏膜内PG，SS，MTL的分泌，可能是其增强胃黏膜屏障功能的机制之一。     

龈内阿米巴的致病作用人群调查及动物实验研究

目的 研究齿龈内阿米巴（Entamoeba gingivalis,Eg）致病作用及其与牙周病的关系.方法 给大鼠免疫抑制剂（醋酸泼尼松龙）,用细钢丝结扎下颌切牙的颈部,在Eg组和对照组大鼠分别用齿龈内阿米巴和生理盐水涂抹龈缘,观察大鼠发病和病理改变情况,调查人群感染齿龈内阿米巴情况.结果 Eg组大鼠牙周组织发病率高于对照组（P＜0.01）,Eg组大鼠牙龈上皮组织溃疡、炎症细胞浸润、牙龈沟内上皮增生、牙周脓肿形成、牙槽骨吸收和脓液查见活齿龈内阿米巴,对照组未见病理改变;牙周病患者感染率高于健康人群（P＜0.01）.结论 齿龈内阿米巴是一种机会致病原虫,当宿主免疫力下降时,可致牙周病.     

盐酸甲氯芬酯对VD大鼠学习记忆及长时程增强的影响

目的:观察盐酸甲氯芬酯对血管性痴呆(VD)模型大鼠学习记忆能力的影响并探讨其神经生物学机制.方法:采用改良的4-VO法建立VD大鼠模型,用盐酸甲氯芬酯治疗,然后进行Morris水迷宫测试和在体海马齿状回长时程增强(LTP)检测.结果:盐酸甲氯芬酯组与模型组比,平均逃避潜伏期缩短、穿越平台次数增加,且高频刺激后的PS幅值、PS斜率明显增大,PS峰潜伏期缩短.结论:盐酸甲氯芬酯可改善VD模型大鼠学习记忆能力,易化VD模型大鼠海马齿状回LTP可能是其途径之一.     

金纳多对RCS鼠视网膜色素变性神经元保护作用

目的 探讨金纳多（Ginaton，EGb761）对RCS大鼠视网膜色素变性神经元保护作用的机制。方法 将出生后雄性RCS大鼠48只随机分为给药组和对照组。给药组大鼠从生后7d开始腹腔注射金纳多，每3d注射一次，剂量为100mg／kg。对照组大鼠注射生理盐水，剂量相同。苏木精-伊红染色和TUNEL检测观察EGB761对视网膜色素变性神经元的保护作用。应用免疫组织化学方法检测Caspase-2蛋白的表达。结果 给药组大鼠生后20和25d，感光细胞的数目与对照组大鼠比较明显增加（t=3．32、3．56，P〈0．05）。给药组大鼠生后25d TUNEL检测阳性细胞数目比对照组少，差异有统计学意义（t=3．74，P〈0．05）。生后25～40d，给药组和对照组大鼠在节细胞层和内核层观察到Caspase-2阳性染色。给药组大鼠生后20和25d时内核层Caspase-2阳性细胞数少于对照组（t=2．87，P〈0．05）。结论 在RCS大鼠视网膜变性的早期，EGb761对神经元起保护作用，其作用机制可能与Caspase-2蛋白的低表达有关。     

沙棘籽渣黄酮和沙棘油对高糖高脂诱导的老年肥胖雌鼠血脂的影响

目的:观察沙棘籽渣黄酮和沙棘油对老年肥胖雌鼠血脂的影响。方法:应用沙棘籽渣黄酮和沙棘油对高糖高脂诱导的老年肥胖雌鼠进行灌胃给药,连续6w,观察对老年肥胖雌鼠体重、肥胖指数、血脂及游离脂肪酸、高低密度脂蛋白等指标的影响。结果:沙棘籽渣黄酮可显著降低老年肥胖雌鼠的肥胖指数,有效控制其体重增加;并能极显著降低模型动物血清甘油三酯和游离脂肪酸水平;沙棘油可显著降低老年肥胖雌鼠的游离脂肪酸水平。结论:沙棘籽渣黄酮和沙棘油均可显著改善老年肥胖雌鼠血脂状况。