性别差异对脓毒症大鼠肝脏Toll样受体4和髓样分化蛋白-2基因表达的影响

目的探讨性别差异对脓毒症大鼠肝脏组织Toll样受体4(TLR4)和髓样分化蛋白- 2(MD-2)基因表达的影响。方法以脂多糖(LPS)按5 mg/kg体重由大鼠腹腔注射制作脓毒症动物模型,注射后2 h留取肝脏组织检测TLR4、MD-2和肿瘤坏死因子-α(TNF-α)基因表达,同时测定各组大鼠血浆中丙氨酸氨基转移酶(ALT)及雌二醇含量。结果正常雌雄性大鼠肝脏组织均可表达少量TLR4、MD-2、TNF-α基因,其中雌性组分别为0．175±0．034、0．211±0．044、0．201±0．068; 雄性组分别为0．205±0．061、0．243±0．049、0．243±0．063,两组数据差异无统计学意义(P> 0．05),但LPS刺激后雌性大鼠肝脏组织上述指标分别为0．615±0．089、0．708±0．181、0．730± 0．118,血浆中ALT含量为(81．07±10．72)U／L;雄性组分别为0．723±0．091、1．123±0．272、 0．881±0．156,ALT含量为(106．39±14．21)U／L,雌性组各项指标均明显低于雄性大鼠(P< 0．05)。相关分析表明雌性及雄性脓毒症大鼠肝脏组织TLR4及TNF-α基因表达与相应性别大鼠血浆中雌二醇含量呈显著负相关(P<0．05)。结论 LPS刺激后大鼠肝脏组织TLR4、MD-2及 TNF-α基因表达存在性别差异,内源性雌激素的作用可能导致雌性脓毒症大鼠肝脏组织损伤较雄性轻。     

Capsazepine: a competitive antagonist of the sensory neurone excitant capsaicin.

1. Capsazepine is a synthetic analogue of the sensory neurone excitotoxin, capsaicin. The present study shows the capsazepine acts as a competitive antagonist of capsaicin. 2. Capsazepine (10 microM) reversibly reduced or abolished the current response to capsaicin (500 nM) of voltage-clamped dorsal root ganglion (DRG) neurones from rats. In contrast, the responses to 50 microM gamma-aminobutyric acid (GABA) and 5 microM adenosine 5'-triphosphate (ATP) were unaffected. 3. The effects of capsazepine were examined quantitatively with radioactive ion flux experiments. Capsazepine inhibited the capsaicin (500 nM)-induced 45Ca2+ uptake in cultures of rat DRG neurones with an IC50 of 420 +/- 46 nM (mean +/- s.e.mean, n = 6). The 45Ca2+ uptake evoked by resiniferatoxin (RTX), a potent capsaicin-like agonist was also inhibited. (Log concentration)-effect curves for RTX (0.3 nM-1 microM) were shifted in a competitive manner by capsazepine. The Schild plot of the data had a slope of 1.08 +/- 0.15 (s.e.) and gave an apparent Kd estimate for capsazepine of 220 nM (95% confidence limits, 57-400 nM). 4. Capsazepine also inhibited the capsaicin- and RTX-evoked efflux of 86Rb+ from cultured DRG neurones. The inhibition appeared to be competitive and Schild plots yielded apparent Kd estimates of 148 nM (95% confidence limits, 30-332 nM) with capsaicin as the agonist and 107 nM (95% confidence limits, 49-162 nM) with RTX as agonist. 5. A similar competitive inhibition by capsazepine was seen for capsaicin-induced [14C]-guanidinium efflux from segments of adult rat vagus nerves (apparent Kd = 690 nM; 95% confidence limits, 63 nM-1.45 microM).(ABSTRACT TRUNCATED AT 250 WORDS)     

1,1,1,2—四氟乙烷—1,1—二氟乙烷二元系恒温汽液相平衡

采用静态蒸汽总压法实验装置，在２９．９４℃、３９．９２℃和４９．９３℃下，测定了１，１，１，２－四氟乙烷－１，１－二氟乙烷二元系汽液相平衡时的物料，总量、系统组成、蒸汽总压和汽相体积。结合物料衡算和Ｔ、Ｐ、ｘ推算ｙ的曲面样条函数法，计算出对应的平衡汽液相组成。用改进的ＰＲ状态方程和一个与温度无关的可调相互作用参数关联了实验数据。     

166例涎腺腺样囊性癌的临床病理分析

目的 分析涎腺腺样囊性癌的临床病理特点。方法 对166例涎腺腺样囊性癌行临床资料总结和HE组织学观察。结果 本组腺样囊性癌占涎腺上皮性肿瘤的11．5％，占涎腺癌的27．0％；男性略多于女性；中年以上好发；发生于小涎腺者多于大涎腺，以腭部为最常见；腺样型103例，管状型42例，实性型2l例；Ⅰ级17例，Ⅱ级128例，Ⅲ级2l例。结论 需与基底细胞腺癌、涎腺导管癌、多形性低度恶性腺癌、上皮-肌上皮癌鉴别诊断；浸润性极强是其显著特点，手术治疗以局部大块切除为主要原则。     

桡骨远端骨折180例诊断分析

本文分析我院1997-2000年180例诊断、诊疗结果并对并发症进行讨论. 　　1 临床资料 　　1.1 病例 180例中男84例,女96;年龄18～89岁.左侧76例,右侧98例,双侧6例,皆因外伤.……     

三七总皂甙对红系祖细胞增殖调控机理的研究

采用造血祖细胞体外培养和造血生长因子检测等实验血液学技术，研究三七总皂甙对小鼠红系祖细胞调控的生物学机理。结果表明：三七总皂甙对正常或骨髓抑制一贫血模型小鼠的红系祖细胞增殖有明显促进作用。三七总皂甙亦可提高阿糖胞苷所致祖细胞的“自杀”率；经三七总皂甙诱导制备的脾细胞，Ｌ细胞培养上清液和红系祖细胞的直殖具有较高刺激活性。