A cell line secreting stimulating factors for CFU-GEMM culture

The multipotent hemopoietic stem cell has fastidious growth requirements in vitro. Traditionally, phytohemagglutinin-stimulated leukocyte conditioned medium has been used to supply the undefined growth factors required for culture of the human multipotent hemopoietic progenitor. We describe the use of medium conditioned by the bladder carcinoma cell line, 5637, to replace PHA-LCM in CFU-GEMM cultures and show that the properties of this conditioned medium closely mimic those of PHA-LCM in two separate CFU-GEMM culture systems.     

食管球囊联合超细胃镜扩张贲门失弛缓症1例

对1例中年贲门失弛缓症患者于超细胃镜直视下应用食管球囊预扩张一次的基础上,将胃镜插至胃底反转对球囊定位后再次扩张.扩张口径满意,无穿孔；症状缓解,随访1mo无复发.     

胃黏膜保护的基础与临床研究进展

长期以来胃黏膜保护一直是基础和临床研究的重点与热点.近年来人们对胃黏膜保护的细胞和分子机制已有了全面深入的认识,发现具有胃黏膜细胞保护作用的物质有很多种,具有细胞保护作用的器官和组织也不仅仅限于胃黏膜,在胰腺、肝脏、肾脏、心脏和脑等都发现有类似现象.因此细胞保护概念的内涵和外延都有拓展.我们对三叶因子、氧自由基、幽门螺杆菌、酒精、非甾体类抗炎药及细胞因子等研究热点与胃黏膜保护相互作用的机制进行初步的探讨.     

Genetic differences in red cell osmotic fragility: analysis in allophenic mice

Mice of strain DBA/2J were found to produce red cells considerably more resistant to osmotic lysis than cells from C57BL/6J or the F1 hybrid between the two strains. Such strain-specific differences in osmotic fragility could be the result of genetically determined humoral or other systemic differences that indirectly influence red cell properties. Alternatively, this phenotypic variation might be an inherent property of the erythrocyte themselves and be directly controlled by their genotype. Analysis of red cells from allophenic (mosaic) mice of the strain composition C57BL/6J in equilibrium DBA/2J demonstrated that the latter possibility is the case. In such mice, erythrocytes of the DBA/2J genotype are relatively more resistant to osmotic lysis than are those of the C57BL/6J genotype; partial lysis of allophenic blood at intermediate salt concentrations results in marked enrichment for DBA/2J cells among the survivors. Future experiments designed to determine the mechanism underlying this difference can now focus on the properties of the red blood cells per se with the certainty that this property is inherent to the genotype of each cell.     

Platelet-type von Willebrand's disease: characterization of a new bleeding disorder

An autosomally transmitted bleeding diathesis sharing some, but not all, features previously described in von Willebrand's disease (vWd) was studied in five patients representing three generations of a single family. Bleeding times in the upper normal range in conjunction with low-normal platelet counts, normal factor VIII coagulant activity and VIII-related antigen, decreased VIII-ristocetin cofactor activity, selective decrease of the higher molecule weight factor VIII/von Willebrand factor (VIII/vWF) multimers, and increased ristocetin- induced platelet agglutination at low ristocetin concentrations were characteristic. Binding of patient VIII/vWF to washed normal platelets was within normal limits, whereas binding of normal VIII/vWF to patient platelets was significantly increased (p less than 0.001 at 0.6 mg/ml ristocetin). This disorder accordingly appears to involve an intrinsic platelet abnormality affecting platelet-VIII/vWF interactions. It is proposed that the concept of vWD be broadened to include patients with this abnormality, which may appropriately be called "Platelet-type von Willebrand's disease."     

Cytosine arabinoside with daunorubicin or adriamycin for therapy of acute myelocytic leukemia: a CALGB study

A randomized comparison of the relative efficacy and toxicity of daunorubicin (DNR) at 30 or 45 mg/sq m or adriamycin (ADM) at 30 mg/sq m, given on the first 3 days of a 7-day continuous infusion of cytosine arabinoside (ara-C) at 100 mg/sq m/day, shows the outcome to be dependent on anthracycline, dose, and patient age. DNR 45 is significantly better than DNR 30 or ADM 30 for inducing complete remissions (CR) in patients younger than 60 yr, (72%, 59%, 58% CRs, respectively). DNR 30 is better than DNR 45 or ADM 30 for inducing CR in patients older than 60 yr (47%, 31%, 35%, respectively). There was a corresponding shift in the induction mortality for the age, dose, and anthracycline groups. Adriamycin was significantly more toxic to the gastrointestinal tract than daunorubicin. The duration of complete remission, with cyclic courses of maintenance therapy, was independent of the patient's age, the dose, or choice of anthracycline used in induction, and of whether the maintenance courses were given every 4 wk or every 8 wk.     

Augmentation of neutrophilic granulocyte progenitors in the bone marrow of mice with tumor-induced neutrophilia: cytochemical study of in vitro colonies

Transplantation of CE mammary carcinoma into mice has been shown to produce marked neutrophilia. Previous studies in vivo indicated a significant increase in marrow neutrophil production in these mice, but regulatory mechanisms of this neutrophilia have not been well understood. In order to obtain information about neutrophil production mechanisms at the progenitor cell level, the profile of marrow granulocyte-macrophage progenitors in mice with neutrophilia induced by this tumor was quantitatively analyzed by cytochemical staining of in vitro colonies to distinguish colonies of neutrophils (N-colony), macrophages (M-colony), and mixed cells (NM-colony). Cell cycle kinetics of progenitors were studied by in vivo administration of cytocidal drugs. The absolute number of N-colonies in a femur increased significantly and reached three times normal three to four weeks after tumor implantation. The number of NM-colonies also increased significantly by the fourth week, but the number of M-colonies was unchanged. The number of N-colonies in a femur related directly to the degree of neutrophilia. The increased number of N-colonies from the marrow of tumor-bearing mice was not attributed to a different time course of colony growth nor to a different sensitivity to CSA; instead, a significantly larger fraction of neutrophilic progenitors from the tumor-bearing mice were in active cell cycle than were those of normal mice. The day 14 tumor-bearing mouse serum demonstrated N-colony stimulating activity while the sera of normal mice and day 7 tumor- bearing mice were inhibitory for in vitro colony growth. These studies demonstrated an increase in the numbers and turnover rate of marrow neutrophilic progenitors in CE tumor-induced neutrophilia, suggesting that this tumor stimulates proliferation of these progenitors in vivo.     

新型牙种植体及圆柱状种植体与颌骨结合力的比较

目的:为适应牙槽骨吸收严重,高度和宽度不足的病例,设计一种一段式新型牙种植体,通过动物体内种植体种植实验观察其与颌骨的结合力,并与圆柱状种植体进行对照。方法:实验于2006-08/2007-05在四川大学华西口腔动物中心完成。①材料:新型牙种植体由直径为3.6 mm的3个圆柱体并排,长14.8 mm,高6 mm,表面积为406.93 mm2,有效抗压面积为134.60 mm2;圆柱状种植体直径为3.6 mm,长为9 mm,基桩高度2 mm,表面积为117.06 mm2,抗压面积为10.174 mm2。2种种植体均由纯钛制成,由成都力威特数控设备有限公司提供。②实验方法:选健康成年雄性狼狗6只,随机分为1,2,3个月组3组,每组2只,分别拔除其双侧下颌全部前磨牙,3个月后每侧拔牙窝内种植新型种植体2颗,同时种植2颗圆柱状种植体为对照。于术后1,2,3个月各处死2只犬,拍摄X射线片观察种植体-骨界面愈合情况及骨密度变化,并利用万能力学实验机通过推出实验测试种植体-骨结合力。结果:狼狗6只均进入结果分析。①种植体-骨界面愈合情况:2种种植体和骨界面的一般观察、牙周检测和X射线表现均相似,均无骨质破坏。②种植体-骨结合力:新型种植体在植入后1个月,骨结合力已达承受正常力的水平;时间变化曲线表明2种种植体的骨结合力随时间均逐渐增加,但新型种植体的骨结合力明显大于圆柱状种植体(P<0.001)。结论:新型种植体因为其特殊的设计体部形态、圆盘状结构增加了支持骨组织的承载面积,较圆柱状种植体有更大的骨结合力。     

催化加氢法制备扑热息痛

目的：研究进一步催化加氢法制备扑热息痛的工艺方法。方法：以对硝基酚和醋酐为原料,Ｐｄ－Ｃ或Ｐｔ－Ｃ作催化剂,加氢制备扑热息痛,优选反应条件。结果：以５％Ｐｔ－Ｃ或５％Ｐｔ－Ｃ作催化剂,于８５℃的温度下反应较为理想,收率可灰８２．３％。结论：相对于传统的二步法工艺,一步加氢法制备扑热息痛的方法操作简便,反应时间短,污染少,是制备扑热息痛的一条很好的途径。