Isolation and characterization of growth factor(s) from a human B-cell lymphoma

We demonstrate that human neoplastic B cells (Br cells) contain a cytoplasmic protein of molecular mass 60 Kd that exhibits B-cell growth factor (BCGF) activity on growth factor-dependent long-term human B cells as well as on autochthonous tumor cells. This 60-Kd protein is recognized by antibodies against a similar intracellular 60-Kd protein derived from normal human lymphocytes. These results demonstrate that the two proteins share epitope homology. Microculture bioassays indicate that neoplastic and normal 60-Kd proteins are capable of driving neoplastic B cells through S-phase. Western immunoblot analysis indicates that neoplastic B cells secrete 60- as well as 14-Kd protein. Immunoaffinity-purified proteins secreted by Br cells exhibit BCGF activity in anti-IgM or dextran sulfate-preactivated human B cells. In addition, a double-antibody immunofluorescence staining technique was used to demonstrate that Br cells express cell surface receptors for BCGF molecule(s). These studies provide support for the autocrine growth model for neoplastic human B cells and suggest that the autocrine growth factor derived from such tumor cells is similar if not identical to normal BCGF molecules.     

角膜移植260例病因分析并与国外数据比较

目的:总结进行角膜移植手术患者的病因学资料,并与国外相应统计资料比较。方法:收集2001-12/2005-12在南昌大学医学院第一附属医院眼科接受角膜移植手术的260例患者(260眼)的临床资料做以统计,内容包括性别、年龄,与角膜移植相关的临床诊断、手术方法等,患者均知情同意。患者的病种统计以出院时第一诊断为基准。260例患者中行单纯板层角膜移植125例,单纯穿透性角膜移植63例,联合羊膜覆盖33例,联合角膜缘干细胞移植术20例,联合结膜瓣遮盖术19例。术后半年进行视力评估,视力<3.7为盲。结果:260例角膜移植患者全部进入结果分析,无脱落。①260例患者中男162例,女98例,年龄(24±19)岁。角膜移植的病因按病例数由多至少排列,首位为角膜炎后角膜白斑,计86例(占3.08%),尤以病毒性角膜炎为主;外伤后角膜疤痕病变居第2位,计78例(占30%),随后为角膜溃疡并穿孔、蚕食性角膜溃疡、圆锥角膜、角膜皮样瘤、角膜营养不良、角膜失代偿、角膜葡萄肿以及角膜原位癌。角膜炎后角膜白斑病毒性角膜炎后最为多见,而国外类似的统计表明大泡性角膜病变占据首位。②术后半年260例角膜移植患者的脱盲率达94%。结论:与发达国家角膜移植最常见病因为大泡性角膜病变不同,角膜炎后角膜白斑、外伤后角膜疤痕、角膜溃疡并穿孔依次是国内角膜移植最常见的原因。