川芎嗪-双黄连-病毒唑对大鼠肺间质纤维化作用及其机理研究

气管灌注博莱霉素建立肺间质纤维化大鼠模型，次日或第15天腹腔注射川芎嗪－双黄连－病毒唑，采用Lowry法和MDA－TBA比色法及日本岛津UV－120－02型分光光度计测定大鼠肺组织羟氢酸，胶原蛋白和过氧化脂质含量，并对动物体重，存活率，肺组织病理学进行观察，结果表明，给药第28天，测定川芎嗪－双黄连－病毒唑组肺组织胶原蛋白和羟脯氨酸含量比给药第14天时分别降低了37.1%和33．0％，肺组织病理学检查，炎性细胞，纤维化程度明显降低，动物体重，存活率均有所增加。     

糖尿病合并冠心病无症状心肌缺血的动态心电图分析

目的 :探讨动态心电图监测糖尿病合并冠心病无症状心肌缺血的发生规律及特点。方法 :对 5 2例糖尿病合并冠心病患者采用 2 4小时动态心电图监测 ,观察ST段变化情况。结果 :记录到缺血性ST段改变 2 65阵 ,其中无症状者 2 3 6阵 ( 89.0 6% ) ;心肌缺血持续时间及缺血时心率两者的均值在有症状和无症状者中有非常显著性差异 (P <0 .0 1)。结论 :糖尿病合并冠心病患者无症状心肌缺血和心植物神经病变的发生率高 ,动态心电图监测对早期诊断具有重要意义     

Improvement of the classification accuracy in discriminating diabetic retinopathy by multifocal electroretinogram analysis

The multifocal electroretinogram (mfERG) is a newly developed electrophysiological technique.In this paper,a classifi- cation method is proposed for early diagnosis of the diabetic retinopathy using mfERG data.MfERG records were obtained from eyes of healthy individuals and patients with diabetes at different stages.For each mfERG record,103 local responses were extracted.Amplitude value of each point on all the mfERG local responses was looked as one potential feature to classify the experimental subjects.Feature sub- sets were selected from the feature space by comparing the inter-intra distance.Based on the selected feature subset,Fisher's linear classi- fiers were trained.And the final classification decision of the record was made by voting all the classifiers' outputs.Applying the method to classify all experimental subjects,very low error rates were achieved.Some crucial properties of the diabetic retinopathy classification method are also discussed.     

血啉甲醚-光动力学疗法去除大鼠前列腺增生的实验研究

以丙酸睾酮诱导的大鼠前列腺增生为研究对象,观察光动力学疗法(PDT)对大鼠前列腺增生的治疗作用.研究结果表明:单纯激光照射或单纯注射光敏剂对大鼠前列腺增生无显著影响(P>0.05);大鼠经各PDT治疗组治疗后,前列腺体积均明显减小,前列腺指数明显下降,与动物模型组存在明显差异(P均小于0.01),说明光动力疗法对前列腺增生细胞具有杀伤和抑制生长作用.     

电刺激迷走背核对大鼠心电活动的影响

用心电高频信息检测分析仪研究了电刺激大鼠迷走神经背核 (DMV)对心电活动的影响 ,分析了刺激前、刺激即刻、刺激后 4min和刺激后 8min高频心电图 (HF -ECG)的各项时域值 .结果显示 :①刺激前心率 ( 4 2 7± 5 6)次 min(x±SD ,下同 ) ,刺激即刻 ( 191± 96)次 min ,与刺激前相比心率显著降低 (p <0 .0 1) ,刺激后心率有回升的趋势 .②刺激前QRS波宽 (Ⅱ导联 ,下同 )( 14 .5± 1.3 )ms ,刺激即刻 ( 19.0± 3 .1)ms,与刺激前相比QRS波宽显著延长 (p <0 .0 1) .③刺激前QRSVp -p( 0 .5 2± 0 .12 )mV ,刺激即刻 ( 0 .3 7± 0 .10 )mV ,与刺激前相比显著降低 (p <0 .0 5 ) .④刺激前切迹数 0 .2 0± 0 .4个 ,刺激即刻 0 .7± 0 .8个 ,与刺激前相比显著增多 .结果表明刺激大鼠的DMV对HF -ECG的时域值有明显影响 ,DMV对心脏电活动有调节作用 .     

Klotho基因在骨质疏松大鼠模型中的表达

研究了卵巢摘除致雌性大鼠骨质疏松过程中Klotho基因表达的变化,探讨雌激素缺失引起骨质疏松发生的可能分子机制.摘除卵巢并喂以特殊饲料致大鼠骨质疏松后,分别测定骨质疏松组和对照组大鼠血清中的钙浓度与碱性磷酸酶含量,X射线法检测两组大鼠股骨密度,实时荧光定量PCR评估两组大鼠肾脏组织中Klotho基因的表达量.结果显示,与对照组相比,卵巢摘除后大鼠血钙浓度降低,碱性磷酸酶含量升高,骨密度减少,同时肾脏组织中Klotho基因表达显著下调.提示Klotho基因的下调及其对相关信号传导通路的影响可能是雌激素缺失导致骨质疏松的分子机制之一.     

外界噪声对一类logistic模型干扰的动力学分析

自然界中,小型动物的生长满足一类logistic模型,除了自身繁殖死亡外,其数量改变在很大程度上受捕食者和其他外界因素的限制。以草原小型害鼠(以下简称小鼠)为例分析了抑制因子μ和噪声关联常数λ对其稳态概率密度分布的影响,结果发现抑制因子μ和噪声关联常数λ的增大,对小鼠的增长均起到抑制作用。     

Effects of progesterone and estradiol benzoate on superoxide dismutase activity in the brain of male rats

The activities of mitochondrial, manganese-containing superoxide dismutase (MnSOD) and cytoplasmic, copper-zinc-containing superoxide dismutase (CuZnSOD) were measured in subcellular fractions of whole brain homogenates prepared from intact and gonadectomized (GDX) male rats, untreated or treated subcutaneously (sc) with a single dose of 2 mg progesterone (P) and/or 5 g estradiol benzoate (EB). Neither MnSOD nor CuZnSOD was affected by the removal of the testes. Similarly, CuZnSOD activity was steady following systemic administration of P and/or EB to intact and GDX animals 2 h or 24 h prior to sacrifice. On the other hand, both P and EB suppressed MnSOD in the brain of either intact or GDX rats. These results suggest involvement of P and EB in the control of MnSOD activity in the brain of male rats.     

Some extracellular matrix elements as markers of ‘capillary tunnels’ in hypertrophied rat heart

We studied the distribution of the extracellular matrix proteins fibronectin (FN) and laminin (LM) in the hypertrophied hearts of spontaneously hypertensive rats (SHR), using an immunofluorescence method with specific antibodies. The immunohistochemical reaction was positive in the cytoplasm of some hypertrophied cardiomyocytes. The results showed that FN and LM can be used as markers for tunnels, i.e. intracardiocytic invaginations of the sarcolemma. The tunnels observed contained capillaries.     

Stress and putative endogenous ligands for benzodiazepine receptors: The importance of characteristics of the aversive situation and of differential emotionality in experimental animals

The relationships between anxiety/stress, possible endogenous ligands for benzodiazepine receptors and the behavioral modification by drugs are discussed in this short review, including the specific characteristics of elements involved in those interactions, e.g. ones concerning the aversiveness of the stressful situation and the nature of the organism under investigation. These are important factors when considering aversive tasks, insofar as they may involve stressful conditions which differ in intensity and in the degree of control afforded the subject. These characteristics may well lead to differing functional effects on GABA-gated chloride channels or, in other words, to an incongruous balance between endogenous benzodiazepine receptor agonist and inverse agonist activity. This is not surprising, as it is well known that different forms of stressors often actually produce divergent behavioral, physiological and biochemical effects. This review also illustrates the necessity of taking into account the variable effects of stressors and/or drugs on animals differing in reactivity or emotionality, even in the case of non-selected stocks. The implication is made that, by genetic and/or environmental manipulation of the emotional state of the animals used, it will be possible to obtain more clearly definable results in neuropharmacological and psychopharmacological studies.