On the Use of Paramagnetic Beads and Ferrofluids to Assess and Eliminate the Leukocytic Contribution to Oxygen Radical Generation by Human Sperm Suspensions

PROBLEM: To develop a methodology to determine a) the leukocytic contribution to reactive oxygen species generation by human sperm suspensions and b) the therapeutic value of removing these cellular contaminants. METHODS: Leukocytes were removed with paramagnetic beads or colloidal ferrofluids coated with anti-CD45 antibody. The sperm suspensions were monitored for oxidant generation by chemiluminescence, leukocyte contamination by immunocytochemistry, and fertilizing potential using zona-free hamster oocytes. RESULTS: Percoll®-prepared human sperm suspensions exhibited a competence for PMA-induced reactive oxygen species generation which was significantly correlated with leukocyte contamination. However, the purified spermatozoa remaining after paramagnetic bead treatment, also demonstrated an intrinsic capacity for PMA-responsive reactive oxygen species generation and, freed from the oxidative stress created by the leukocytes, exhibited a significantly enhanced capacity for sperm-oocyte fusion. CONCLUSIONS: Although human spermatozoa can generate reactive oxygen species, sperm function is inhibited by the additional oxidative stress created by contaminating leukocytes. Removal of these cells with paramagnetic beads enhances fertilizing potential.     

The characterization and pathological significance of gastric Campylobacter-like organisms in the ferret: a model for chronic gastritis?

Gastric campylobacter-like organisms (CLO) were isolated from gastric tissues removed at sacrifice from 17 mature ferrets; all animals were colonized, but no macroscopic mucosal lesions or histological features of chronic gastritis were seen. The isolates resembled Campylobacter pylori in many cultural and biochemical characteristics, and produced substantial urease activity, but there were sufficient differences from C. pylori to suggest that ferret gastric CLO represents a separate species. Comparison of human C. pylori and ferret gastric CLO may help to elucidate the pathogenicity of the former in patients with gastritis, and the ferret may serve as a useful animal model for the study of C. pylori infection.     

头孢克洛在健康人体内的药物动力学研究

采用ＨＰＬＣ测定健康志愿者血浆中头孢克洛的浓度。方法简便快速，结果准确。平均回收率为１０２．１８±４．０１％，日间及日内ＲＳＤ均小于６％。血药浓度－时间曲线符合一室模型。     

实验性视网膜光化学损伤中的蛋白激酶C

目的：研究实验性视网膜光化学损伤中蛋白激酶C(protein kinase C，PKC)活性的改变；探索地塞米松(dexamethasone，DXM)对视网膜中PKC活性的影响。 方法；48只SD大鼠分为对照组和DXM组，后者于光照前3天开始，连续5天腹膜腔注射DXM 1mg/(kg·d)。经(1 900±106.9)Ix的绿色荧光灯(λ＝510nm～560nm)连续照射24小时后的6小时和1、3、7、14天，进行视网膜PKC活性检测。 结果：光化学损伤后视网膜中的PKC活性在短暂的上升后即出现持续性的下降；DXM对PKC的活性改变无明显作用。 结论：光化学损伤中的视网膜功能障碍可能与PKC活性的持续降低有关。 （中华眼底病杂志，1997，13：78-80）     

豨莶脂溶性成分的研究

从豨莶(Siegesbeckia orientalis L.)的地上部分,分离出八个化合物,其中I和I根据理化性质和光谱数据确定其结构为ent-17-acetoxy-18-isobutyryloxy-16(α)-kauran-19-oicacid(I)和ent-17-ethoxy-16(α)-kauran-19-oicacid(II),均为新化合物,分别被命为豨莶酯酸(siegesesteric acid,I)和豨莶醚酸(siegesetheric acid,I)。其余化合物分别鉴定为腺梗豨莶萜醇酸(ent-16β,17-dihydroxy-kauran-19-oicacid,II),奇任醇(kirenol,IV,β-谷甾醇葡萄糖甙(β-sitosterolglucoside,V),二十一醇(heneicosanol,VI),花生酸甲酯(methyl arachidate,VII)和β-谷甾醇(β-sitosterol,VII)。除奇任醇和β-谷甾醇外,均为首次从该植物中分得。