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Mammographic appearance of malignant lymphoma of the breast 总被引:4,自引:0,他引:4
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Gaucher disease is an inherited lysosomal storage disease in which the loss in functional activity of glucocerebrosidase (GC) results in the storage of its lipid substrate in cells of the macrophage lineage. A gene therapy approach involving retroviral transduction of autologous bone marrow (BM) followed by transplantation has been recently approved for clinical trial. Amelioration of the disease symptoms may depend on the replacement of diseased macrophages with incoming cells expressing human GC; however, the processes of donor cell engraftment and vector gene expression have not been addressed at the cellular level in relevant tissues. Therefore, we undertook a comprehensive immunohistologic study of macrophage and microglia replacement after murine BM transplantation with retrovirus-marked BM. Serial quantitative PCR analyses were employed to provide an overview of the time course of engraftment of vector-marked cells in a panel of tissues. Following reconstitution of hematopoietic tissues with vector- marked donor cells at early stages, GC+ cells began to infiltrate the liver, lung, brain, and spinal cord by 3 months after transplant. Immunohistochemical analyses of PCR+ tissues using the 8E4 monoclonal antibody specific for human GC revealed that macrophages expressing human GC had partially reconstituted the Mac-1+ population in all tissues in a manner characteristic to each tissue type. In the brain, 20% of the total microglia had been replaced with donor cells expressing GC by 3 to 4 months after transplant. The finding that significant numbers of donor cells expressing a retroviral gene product immigrate to the central nervous system suggests that gene therapy for neuronopathic forms of lysosomal storage diseases as well as antiviral gene therapy for AIDS may be feasible. 相似文献
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抗三尖杉酯碱HL-60细胞的抗程序性细胞死亡及其克服 总被引:13,自引:0,他引:13
三尖杉酯碱(harringtonin,HT)是中国产植物海南粗榧(CephalotaxushainanensisLi)中提取的一种抗肿瘤药物,对急性粒细胞白血病、急性单核细胞白血病有较好疗效(1)。三尖杉酯碱可非常有效地诱导敏感HL-60细胞程序性死亡(apoptosis,Apo)(2,3)。但超过半致死剂量(IC50)近百倍的HT却不能诱导抗三尖杉酯碱细胞HT12程序性死亡。如用维拉帕米(verapamil,Vp)10μg·ml-1逆转多药抗性后,HT虽可诱导HT12细胞程序性死亡,但与敏感细胞相比,出现程序性细胞死亡的时间大大推迟,用药浓度也提高约10倍。这些结果提示:程序性细胞死亡可能作为肿瘤细胞是否已形成抗药性的标志之一,同时也说明程序性细胞死亡相关因子可能参与肿瘤细胞抗药性的形成。 相似文献
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Paranasal sinus hemorrhage: evaluation with MR imaging 总被引:1,自引:0,他引:1
Computed tomography (CT) and magnetic resonance (MR) imaging were performed in ten patients with paranasal sinus hemorrhage after trauma. Acute or subacute hemorrhage was detected on MR images by using T1- and T2-weighted imaging to identify the chemical state of the blood and to differentiate blood from mucosal thickening and sinus effusion. Surgical proof of intrasinus hemorrhage was obtained in only two cases. Displaced fractures, associated cerebral contusions, and traumatic encephalocele were well shown on MR imaging. Nondisplaced and minimally displaced fractures were better evaluated with CT. 相似文献
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Spring hookwire breast lesion localizer: use with rigid-compression mammographic systems 总被引:2,自引:0,他引:2
Modifications have been made in the spring hookwire system to facilitate accurate three-dimensional placement and to aid surgeons in gauging the location of the hook with respect to a breast lesion. Difficulties in placement of the needle created by rigid compression systems can be overcome by using a combination of a fenestrated compression plate and a spot-compression device. 相似文献