补肾中药对雄激素致不孕大鼠卵巢核仁组成区蛋白的影响

观察补肾中药对雄激素致不孕大鼠卵巢核仁组成区蛋白的影响。用ＳＤ雌性大鼠幼仔，出生９ｄ龄注射丙酸睾丸酮，制成雄激素致不孕大鼠（ＡＳＲ）模型。８０ｄ龄灌服补肾中药水溶液两周。１００ｄ龄心脏灌注处死。以核仁组成区蛋白嗜银染色（ＡｇＮＯＲ）和增殖细胞核杭原（ＰｃＮＡ）为指标，观察卵巢颗粒细胞、间质腺细胞的形态学变化。结果：补肾中药能够使ＡＳＲ卵巢颗粒细胞增殖、卵泡发育。治疗组的ＡｇＮＯＲ和ＰｃＮＡ计数明显高于模型组，而与对照组之间无显著差异。结论：补肾中药的这种作用可能是通过调节了下丘脑－垂体－卵巢性腺功能的结果，从而促使卵巢颗粒细胞发育、卵泡成熟。     

冷束缚应激大鼠室旁核Fos表达的检测

目的：探讨应激对下丘脑室旁核中Fos表达的影响，以期揭示应激性溃疡发病的神经内分泌机制。方法：采用SD大鼠冷束缚应激模型，用免疫组织化学方法检测应激前后大鼠下丘脑室旁核Fos的表达。结果：应激后室旁核Fos阳性细胞数量显著增多（t=26.7,P＜0．001）。结论：室旁核可能参与了应激性溃疡的病理过程。     

肝癌组织辅助性T细胞-2细胞因子强势分泌研究

目的　探讨人肝癌组织中辅助性T细胞亚群 (Th1/Th2 )细胞因子表达模式。方法　收集我科手术切除肝癌组织标本 15例 ,肝良性疾病或肝硬化门静脉高压手术患者肝组织标本 15例作为对照 ,β 肌动蛋白 (β actin)作为参照 ,采用半定量逆转录 聚合酶联反应 (RT PCR)方法检测人肝癌组织中γ 干扰素 (IFN γ)和白细胞介素 4(IL 4)mRNA的表达。结果　人肝癌组织中IFN γmRNA表达 (相对数 :1.18± 0 .3 1)比对照组肝组织中IFN γmRNA表达弱 (相对数 :1.86±0 .5 0 ) ,而IL 4mRNA表达 (相对数 :1.73± 0 .5 1)比对照组强 (相对数 :0 .94± 0 .41,P <0 .0 5 )。结论　人肝癌组织中Th1类细胞因子表达弱 ,Th2类细胞因子表达强 ,呈现Th2细胞因子表达模式 ,肝癌组织局部微环境处于免疫抑制状态 ,肿瘤细胞易发生免疫逃逸     

用脱脂奶粉代替小牛胸腺DNA进行核酸分子杂交

本文应用脱脂奶粉代替小牛胸腺DNA等大分子物质配制预杂交液和杂交液进行核酸分子杂交,同时用经典的含小牛胸腺DNA等大分子物质的预杂交液和杂交液作为对照。结果表明,用脱脂奶粉可以代替小牛胸腺DNA等大分子物质进行核酸分子杂交,此法经济,配制简便,实际可用。     

Nd—YAG激光在可摘局部义齿基牙预备的应用

为了解决可摘局部义齿修复过程中牙本质过敏基牙预备的困难和戴牙后加重磨耗等问题，于１９９１年起，对２０例（３０颗）牙本质过敏基牙在预备前、后进行了Ｎｄ－ＹＡＧ激光治疗。经过０．５～４年的临床观察，结果表明该疗法可以明显减轻患者在基牙预备时的敏感与不适，使得基牙预备顺利完成且无副作用，治疗后支托窝与隙卡沟均无明显磨耗。根据本研究结果，建议将Ｎｄ－ＹＡＧ激光治疗作为对可摘局部义齿的牙本质过敏基牙预备的常规方法，对健康基牙亦可在预备后应用。     

UVB radiation induces phosphorylation of the epidermal growth factor receptor, decreases EGF binding and blocks EGF induction of ornithine decarboxylase gene expression in SV40-transformed human keratinocytes

Abstract We previously demonstrated that epidermal growth factor (EGF) induces a several-fold increase in ornithine decarboxylase (ODC) activity and the steady-state level of ODC mRNA in cultured SV40-transformed human keratinocytes (1). Pretreatment of cell cultures with ultraviolet B (UVB) radiation resulted in a reduction of EGF-induced ODC activity. To determine whether UVB inhibits the accumulation of ODC mRNA by EGF, cells were pretreated with 20 mJ/cm² UVB or sham-irradiated and then incubated with 100 ng/ml EGF. Northern blot analysis revealed that UVB irradiation entirely blocked the EGF induction of ODC mRNA. Since the binding of EGF to its plasma membrane receptor is the first step in initiating a biological response, the effect of UVB on EGF binding was evaluated. UVB treatment of cultured keratinocytes resulted in an immediate and dose-dependent reduction of EGF binding. Scatchard analysis revealed thai the reduction of EGF binding was due to a 52% decrease in the number of available receptors, from 6.2 × 10⁴/cell to 3.0 × 10⁴/cell. However, UVB decreased the EGF-binding affinity very little (Kd = 0.60 nM in control and Kd=0.75 nM in UVB-treated Z114 cells). In addition, UVB did not alter the rate of EGF internalization. These data suggest that UVB blocks the signal transduction pathway of EGF that is involved in regulation of ODC gene expression. Immunoblot analysis of extracts from irradiated cells showed that UVB induced tyro-sine phosphorylation of EGFR and that the quantity of EGFR protein was unaffected by UVB treatment. Phosphorylation of EGFR may be responsible for decreased binding of EGF to its receptor.     

No association between the Pro197Leu polymorphism in the glutathione peroxidase (GPX1) gene and schizophrenia

OBJECTIVE: Oxidative stress such as free radical-mediated neuronal dysfunction may be involved in the pathophysiology of schizophrenia. The human glutathione peroxidase (GPX1) is a selenium-dependent enzyme, which plays an important role in the detoxification of free radicals. We therefore hypothesized that the GPX1 gene, which is located on chromosome 3p21.3, may be involved in the pathophysiology of schizophrenia. The aim of this study is to examine whether a potentially functional polymorphism, a proline (Pro) to leucine (Leu) substitution at codon 197 (Pro197Leu) of the human GPX1 gene, is associated with susceptibility to schizophrenia. METHODS: We genotyped the Pro197Leu polymorphism in a total of 113 nuclear families that had a proband with schizophrenia. Genetic association was tested using the transmission disequilibrium test (TDT), the sib transmission disequilibrium test (STDT), and the family-based association test (FBAT). RESULTS: The minor allele (Leu) frequency was calculated to be 0.282. We could not find significant transmission disequilibrium of the alleles for the Pro197Leu polymorphism in the GPX1 gene in association with the presence of schizophrenia in our family sample (TDT, chi2=0.03, degrees of freedom=1, P=0.86; combined TDT-STDT, Z'=-0.052, P=0.47; FBAT, Z=0.000, P=1.000). CONCLUSION: The results of this study suggest that the GPX1 polymorphism is unlikely to be associated with susceptibility to schizophrenia.     

血浆ET-1和CGRP含量测定对脑出血病人的应用价值

目的 :探讨血浆内皮素 (ET)和降钙素基因相关肽 (CGRP)在脑出血病人急性期与恢复期中的变化。方法 :采用放射免疫分析技术 ,对 4 2例脑出血病人的急性期与恢复期 ,分别测定血浆ET和CGRP含量 ,并用 35例健康对照人员作比较。结果 :脑出血病人血浆ET含量明显高于对照组 (p <0 0 1) ,治疗后有所下降 ;而血浆CGRP含量 ,在脑出血的急性期 ,显著高于对照组 (p <0 0 1) ,恢复期降为正常。结论 :血浆ET和CGRP在脑出血的急性期显著升高 ,并与脑损伤程度有关 ,提示神经肽参与出血性脑损伤的发生发展过程     

肝毒清颗粒对大鼠实验性肝纤维化的防治作用

目的 :观察肝毒清颗粒的抗纤维化作用。方法 :将Wistar雄性大鼠随机分成 6组 ,即正常对照组、模型组、肝毒清大、中、小剂量组和乙肝宁阳性组 ,采用四氯化碳诱导肝纤维化模型。于造模第 2个月始给予治疗药物。实验持续 3月后将大鼠处死取血作肝功检查及取肝组织做病理检查。结果 :肝毒清能降低AST ,升高TP、ALB ,与模型组比较 (P <0 .0 5 ) ;减轻肝脂肪变性、减少纤维组织增生、促进肝细胞再生。结论 :肝毒清对大鼠肝纤维化有明显防治作用     

益气活血类方剂配伍方法的探讨

就气虚血瘀证的临床特征病因、病机进行了探讨,旨在为气虚血瘀证提供遭药组方依据,总结了益气活血类方剂的配伍规律,提出了以益气活血类方剂的配伍规律,提出了以益气活血法为主要治则,分别配行经气药,滋阻养血药,利水化痰药,浊阳散寒药达到气顺血调、标本同治。