Blood Group Chimerism as a Clue to Generalized Tissue Mosaicism

Blood group studies disclosed mosaicism of the red cells in a healthy male Negro donor who was subsequently also found to have mosaicism of skin and bone marrow with respect to XX-XY chromosomal constitution and whose skin showed unequal pigmentation. The two red cell populations were unequal in numbers with a ratio of approximately 10:1. The major population was group A, Jk^a negative and showed the sickling trait in wet films and by electrophoresis. The minor population was group B, Jk^a positive, did not sickle and contained only hemoglobin A. Both red cells were Le^a positive despite the fact that the propositus was a secretor. However, only A substance was secreted and it was demonstrated by salivary studies and with the help of complete family studies, that the minor genetic product which had produced the group B erythrocytes represented the gene contribution se se and was the source of Le^a substance sufficient to coat both red cell populations. The family studies showed that the propositus had received a 2 allele contribution from each parent and was therefore the result of double fertilization of a double egg nucleus presumably an ovum and a polar body.     

骨髓单个核细胞移植对心肌修复相关因子的调节作用

目的:干细胞移植后可以通过分化为心肌细胞、减少心肌重构等方面发挥改善心功能的作用。观察急性心肌梗死后进行骨髓单个核细胞移植对相关细胞因子的调节作用,探讨干细胞发挥改善心脏重构的可能机制。方法:实验于2006-01/2007-02在福建省高血压研究所完成。①实验材料:清洁级SD大鼠由上海实验动物公司提供。②实验方法:取SD大鼠骨髓,分离出单个核细胞,以DAPI标记骨髓单个核细胞。取体质量200～250g雄性SD大鼠24只,建立急性心肌梗死模型后,随机分为2组,实验组从股静脉注入同种异体大鼠骨髓单个核细胞1.0×107,对照组注入等量的生理盐水。③实验评估:于移植后4周采用免疫组组织化学法检测DAPI阳性细胞、肌钙蛋白阳性细胞、基质细胞源性因子1、转化生长因子β及大鼠心功能改变。结果:24只大鼠均进入结果分析。移植后4周实验组基质细胞源性因子1表达较对照组明显升高,转化生长因子β表达较对照组下降;实验组在免疫荧光显微镜下可观察到DAPI和肌钙蛋白阳性细胞,心功能较对照组明显改善。结论:骨髓单个核细胞移植改善急性心肌梗死大鼠心功能的同时伴有基质细胞源性因子1表达增加及转化生长因子β表达下降。     

Proliferation of human malignant hematopoietic cells in immunodeficient mice: suppression by antibody to pluripotent K-562 leukemia cells involves direct cytolysis and effector cells

Six human hematopoetic cell lines were successfully heterotransplanted into athymic (nude) and asplenic-athymic (lasat) neonatal mice. The tumors arising from leukemia and lymphoma cells could then be serially transplanted into adult nude mice. Seven days after the fourth serial mouse passage, each mouse was treated with goat immune gamma globulin against K-562 cells. One control group was treated similarly, but with nonimmune (normal) gamma globulin, while another control group was not treated. The goat gamma globulin was not toxic for nude and lasat mice, and the immune, but not the normal, gamma globulin suppressed local subcutaneous growth of myelosarcomas, lymphosarcomas, and Burkitt lymphoma cells. On the other hand, the growth of lung, breast, and prostatic carcinomas and a melanoma of human origin were not altered by the immune gamma globulin. Since suppression of cell growth occurred equally well in decomplemented mice, a complement-mediated cytotoxicity apparently cannot be considered as responsible for the abrogation. The Fab fragment of the immunoglobulin did not suppress the growth of the myelosarcomas. We conclude that antibody suppression of the in vivo proliferation was specific for malignant hematopoietic cells and that the Fc portion of IgG is necessary for in vivo cytolysis of leukemia cells. The most probable mechanisms are direct antibody cytolysis and antibody-dependent macrophage-mediated cytotoxicity.     

Outpatient therapy of intra-abdominal abscesses following early discharge from the hospital

Although percutaneous aspiration and drainage of abdominal abscesses will frequently avert an open surgical procedure, patients remain hospitalized during drainage. The authors treated 9 patients for abscesses using percutaneous drainage catheters and sent them home with the catheter in place. All had an uneventful recovery. An average of $12,050 was saved in each case. The authors suggest that outpatient drainage of abdominal abscesses is significantly less expensive than inpatient treatment, yet does not jeopardize patient care.