Picotamide inhibition of excess in vitro thromboxane B2 release by colorectal mucosa in inflammatory bowel disease.

BACKGROUND: Inflammatory bowel disease is associated with increased mucosal release of eicosanoids. Among these, thromboxane A2 has been proposed as a possible inflammatory mediator; its suppression may be a useful therapeutic option. METHODS: Using a tissue incubation technique, we compared release of immunoreactive thromboxane B2 by colonic biopsies from patients with ulcerative colitis, Crohn's disease and controls, and assessed the inhibitory effect of picotamide, a thromboxane synthesis inhibitor-receptor antagonist, which has been widely used in Italy for management of ischaemic heart and cerebrovascular disease. RESULTS: Increased amounts of thromboxane B2 were released from biopsies from patients with active ulcerative colitis (median 238 pg/20 min/mg wet weight (interquartile range 147- 325), n = 12) and active Crohn's disease (252 (174-450), 6) compared with those from patients with quiescent ulcerative colitis (95 (61- 140), 12) or Crohn's disease (105 (57-201), 13), or controls (136 (64- 206), 8). Incubation with picotamide at concentrations between 100 microM and 1 mM reduced thromboxane B2 release (IC50 890 microM). CONCLUSION: Since increased thromboxane A2 production may have pathogenetic importance, thromboxane synthesis inhibitor-receptor antagonists such as picotamide merit therapeutic trial in the management of inflammatory bowel disease.     

Follistatin and activin A production by the male reproductive tract

Follistatin is a binding protein for the activin and inhibin family of hormones, regulating their biological activity. In the male reproductive tract, the interaction of these factors is likely to be involved in the regulation of the proliferation of several cell types. We have investigated the presence of follistatin and activin A in seminal plasma using specific immunoassays and have localized follistatin and activin/inhibin subunits in the adult human testis, prostate and seminal vesicle to establish their likely sources. High concentrations of immunoreactive follistatin were present in seminal plasma in normal men (mean 97.9 ng/ml; 1.43 ng/ml in peripheral plasma) and were similar in men with oligo/azoospermia and following vasectomy. Follistatin immunoreactivity was localized to both Leydig and Sertoli cells of the testis, and to epithelial cells of the prostate gland and seminal vesicle, which are likely to be the predominant sources of the hormone in seminal plasma. Activin A was also present in seminal plasma in normal men but was undetectable following vasectomy, thus deriving from the testis. Consistent with this finding, the betaA-subunit was immunolocalized in Sertoli and Leydig cells but was not present in seminal vesicle or prostate gland. The functional significance of the high concentrations of follistatin secreted into seminal plasma by the prostate gland and/or seminal vesicle is uncertain, but they may regulate the biological activity of testis-derived activin A and inhibin B.      

726例小儿急性中毒的特点及预防探讨

[目的]探讨小儿急性中毒的特点及预防方法。[方法]回顾分析5年来共726例小儿急性中毒的一般临床调查资料。[结果]小儿急性中毒近年来明显增多,发病年龄高峰为小于3岁及大于8岁,中毒种类多,医源性中毒、误服和自杀中毒有增多趋势。[结论]预防措施应重在加强对食物卫生及医疗单位尤其是基层医疗机构执业规范的监督管理,并应注意青少年的心理健康教育。     

Michaelis—Menten兼有一级消除动力学模型平均稳态时的一些特性

本文将Rowland等人的二房室模型中的消除过程扩展成米氏兼一级消除过程。据此,推导出达到稳态浓度的时间、血药浓度-时间曲线下面积和生物利用度的公式;进而得到平均清除率和剂量间的关系以及剂量与平均清除率和血浆浓度呈线性关系的结论。     

室间隔缺损患者肺动脉压的多因素分析

本文对４３例经心导管证实的空间隔缺损患者进行了多因素逐步回归分析，发现在２３项临床参数中，对肺动脉压有显著影响的因素，依次为红细胞压积、周围血管征、空间隔缺损大小、心脏杂音强度、心胸比率（ｒ＝０．８０２８），并初步探讨了各因素对肺动脉压的影响机制，旨在能非创伤性地动态了解患者肺动脉压力，为临床工作提供参考依据。     

肉鸡对不同形态锰源的生物利用率研究

目的 :　研究肉仔鸡对不同形态锰源的相对生物学利用率。方法 :　将 62 4只 1日龄肉公鸡随机分为 1 3组 ,分别饲不添加锰的基础饲粮 (对照组 )或以不同锰化合物添加 60、1 2 0、1 80 mg/ kg锰的试验饲粮 2 1 d。结果 :　肉鸡生长性能各指标和腿病发生率以及肉鸡的跖骨灰锰含量、心肌细胞线粒体中 Mn SOD活性均未受到添加锰源以及锰源与锰水平互作的显著影响 ,但受到添加锰水平的显著影响。肉鸡心肌含锰量和 Mn SOD m RNA水平均未受到添加锰源与锰水平互作的显著影响 ,但受到添加锰源及添加锰水平的显著影响。其中中等和强络合强度有机锰源的生物学利用率明显高于无机硫酸锰和弱络合强度有机锰源。结论 :　中等和强络合强度的复合氨基酸锰对肉仔鸡的生物学利用率明显优于无机硫酸锰和弱络合强度的蛋氨酸锰     

年轻人冠状动脉壁平滑肌细胞的表型变化及其与巨噬细胞的关系——免疫组织化学研究

选用年轻人冠状动脉材料，免疫组织化学方法，观察了弥漫性内膜增厚、脂纹、动脉粥样硬化斑块中平滑肌细胞的免疫表型变化，并将这些变化同巨噬细胞进行了联系。结果表明，凡是有巨噬细胞浸润之处，不管何种病变，该处的平滑肌细胞便失去了相应抗体的反应性，但仍能被抗间叶细胞抗体所标记，提示平滑肌细胞已经发生表型转变。这一现象说明巨噬细胞在平滑肌细胞表型转变过程中起重要作用，有助于人们对动脉粥样硬化病变、冠脉成形术后再狭窄病变发生过程的认识。     

黄芪丹参复方成分对一氧化氮合成阻滞孕鼠模型血浆IL-1、IL-10变化的影响

目的探讨黄芪丹参复方成分提高胎盘血供的分子机制，为临床有效防治胎盘血供不足所致妊娠并发症提供思路。方法提取分离黄芪、丹参复方成分，运用NOS（一氧化氮合酶）阻滞剂L－精氨酸甲酯（L—NAME）建立一氧化氮合成阻滞大鼠模型，ELISA法检测妊娠18d大鼠血浆IL－1、IL－10水平。以及胎盘超微形态学变化，大鼠血压、尿蛋白变化，以及仔鼠重、肝重、脑重、胎盘重等。结果一氧化氮合成阻滞模型组IL－1含量明显高于空白组（P〈0．01），经黄芪丹参注射液治疗后，血浆IL－1水平比模型组降低（P〈0．05）；模型组IL－10含量较空白组低（P〈0．01），中药组血浆IL－10水平高于模型组（P〈0．05）；胎盘形态学、血压、尿蛋白以及仔重、仔肝重、脑重等均有显著差异（P〈0．05，P〈0．01）。结论黄芪丹参复方成分可能对妊娠早期母－胎界面免疫平衡具有调控作用，通过促进局部生理抑制性免疫反应增强和杀伤、排斥免疫反应减弱，从而有利于母胎循环构建，维持胎盘血液供应。