四氯化碳诱导近交系C57BL/6小鼠建立肝纤维化模型

目的 比较不同剂量四氯化碳诱导近交系C57BL/6小鼠肝纤维化模型的效果,以建立稳定的肝纤维化模型。方法 选择5周龄的C57BL/6近交系小鼠,分别腹腔注射给予高、中、低剂量的四氯化碳诱导肝纤维化,实验结束后取血及肝脏组织,检测血浆丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)的水平及肝脏病理变化。结果 近交系C57BL/6小鼠药物诱导后,各剂量组动物均能存活到8周,高剂量组存活率仅为20%远低于中、低组;血清转氨酶含量升高程度、肝组织病理改变存在剂量时间效应关系。病理分析表明,各剂量组均可见肝细胞变性/坏死、中央静脉周围/汇管区混合细胞浸润及肝脏纤维化。结论 10%四氯化碳给药8周后能诱导近交系C57BL/6小鼠形成较稳定的肝纤维小鼠模型,为后续肝纤维化机制研究及药物筛选工作奠定了基础。     

卵巢过度刺激综合征大鼠模型的建立

目的 筛选、比较卵巢过度刺激综合征大鼠模型(OHSS)的建立方法,为OHSS机制研究及治疗药物的开发提供良好的动物模型。方法 将60只3～5周龄的Wistar和SD大鼠随机分组后注射不同剂量的孕马血清(PMSG)和人绒毛膜促性腺激素(hCG)进行OHSS模型的建立,并通过大体病理学检查、脏器指数测量、血液孕激素、雌激素及VEGF浓度测定等方法对所建立模型进行综合评价。结果 3周龄SD大鼠出现了明显的卵巢增大,血管通透性增加,血清VEGF水平上升等OHSS典型改变,更适用于进行OHSS大鼠模型的建立。结论 比较并筛选得到了可靠造模方法,为后续的OHSS发病机制研究及治疗药物开发提供了良好的动物模型。     

Presence of serum proteins in submaxillary duct perfusate

Summary The secretory activity of the main excretory duct of rat submaxillary gland was investigated by the technique of luminal perfusion. Immunologic studies of the perfusate revealed the presence of serum antigens and the absence of intrinsic submaxillary gland antigens. It is suggested that the submaxillary duct permits passive transport of serum proteins to saliva from serum.     

Pubertal changes in the medio-basal hypothalamic area after neonatal suprachiasmatic nucleus lesions in the rat

Summary In order to get more insight into the mechanism by which the onset of puberty is controlled, a developmental study on the displacement of catalase- and dopamine-containing cells in the hypothalamic region was done in rats which received a neonatal lesion of the suprachiasmatic nucleus. The displacement of cells is delayed after these lesions. However, the time lost at the beginning of the displacement is made up at the end of the migration.     

纳洛酮对离体心肌缺血再灌注损伤大鼠心脏功能的影响

目的:在离体大鼠心肌缺血再灌注模型上,观察阿片受体特异拮抗剂纳洛酮对大鼠心功能的影响,并探讨其机制。方法:建立改良的Langendorff离体大鼠心脏灌注模型,缺血40min,再恢复常速灌注30min,造成心肌缺血再灌注损伤。用两种不同浓度的纳洛酮(16mg/kg和32mg/kg)分别灌注缺血的心脏后,观察再灌注15min时①心脏左室内压(LVP)、左心室内压最大变化率(±LVdly/dt)、心率(HR)的变化;②冠脉流量、冠脉流出液中总蛋白、肌红蛋白含量、乳酸脱氢酶(LDH)的变化。结果:用纳洛酮灌流缺血的心脏后,与单纯缺血再灌注组比较:①左室内压、左心室内压最大变化率(±LVdp/dt)分别增加;②平均冠脉流量增加、冠脉流出液中总蛋白、肌红蛋白含量和乳酸脱氢酶(LDH)含量均明显减少。结论:纳洛酮对离体的缺血再灌注损伤心脏有保护作用。该研究拓宽了纳洛酮的临床用途,为防治缺血性心脏病提供了理论依据。     

近交系大鼠DNA指纹图和微卫星DNA多态性的分析

实验动物常规生化标记监测方法主要是通过蛋白质的变化来推测相应的基因的变化 ,而在某种程度上存在着一定的局限性。而DNA指纹图和微卫星DNA是对遗传物质DNA的直接监测 ,比生化标记更准确、更可靠 ,更直观。实验中选取国内常用的SHR、SHRSP、WKY、F344、RCS、LEW等 6个近交系大鼠群体 ,采用DNA指纹图和微卫星DNA技术对 6个近交系大鼠群体进行DNA多态性分析 ,以期筛选出具有精确可靠、快速简便、灵敏性高的遗传监测方法。结果 :(1)DNA指纹图①在 4 0kb— 2 3 1kb之间各组的平均图带数在 14— 19条 ,同一群体不同个体间的相…     

The effect of castration,testosterone and estradiol on14C-serotonin metabolism by organ cultures of male rat pineal glands

Summary The pineal gland of the male rat does not appear to rely on prior conversion of testosterone to estradiol for the stimulant effect of testosterone on pineal melatonin and 5-methoxytryptophol synthesis.     

超低温慢速冻存与玻璃化冻存对大鼠骨髓细胞存活率的影响

本文对大鼠骨髓细胞的常规慢速冻存和玻璃化法冻存进行了比较研究，实验结果表明：玻璃化法冻存较短时间的骨髓细胞的回收率和存活率与慢速冻存相比无显著差异，具有一定的可行性。     

15-Hydroxyprostaglandin dehydrogenase and hexokinase in spontaneously hypertensive rat kidney

Summary 15-Hydroxyprostaglandin dehydrogenase (PGDH) surged in hypertensive (SHR) and normotensive (WKY) rat kidney at 8 days of age, is greatest in SHR. Hexokinase fell in SHR at 17 days of age, but thereafter was similar to WKY. This suggests multisystem enzymatic abnormalities in SHR kidney during development of hypertension.     

Inhibition of TSH-stimulated thyroid hormone release and potentiation of TRH-stimulated TSH release by indomethacin in perifusion systems of rat thyroids and pituitaries

Summary Using indomethacin (Ind), a prostaglandin, synthesis inhibitor, in vivo experiments in rats and in vitro experiments with perifusion systems of rat thyroids and pituitaries were conducted. After 35 days of intragastric infusion of Ind, serum TSH levels were markedly increased, the thyroid was swollen and, as a consequence, T₃ and T₄ levels were normal. The T₃ release from perifused rat thyroids under continuous stimulation with 10 mU/ml TSH was inhibited significantly (p<0.01) by 1.0×10^–6 M Ind. On the other hand, the TSH release from perifused rat pituitaries under TRH stimulation was enhanced conspicuously by Ind. It was concluded that Ind decelerated thyroid hormone release from the thyroid and accelerated TSH release from the pituitary in perifusion systems.