石蒜碱对人白血病细胞K562凋亡作用的研究

为了研究石蒜碱对人白血病细胞K562的凋亡作用,采用MTT法检测石蒜碱对K562细胞的细胞毒作用,数据表明石蒜碱对K562细胞的IC50为16.000μmol/L.流式细胞仪检测石蒜碱对K562细胞凋亡率的影响,数据表明给药剂量越大,其凋亡率越高,凋亡率与给药剂量呈依赖关系.激光共聚焦扫描显微镜检测石蒜碱对K562细胞膜电位的影响,数据表明随着给药剂量增大,膜电位逐渐降低,且成剂量依赖关系.结果显示石蒜碱能够诱导K562细胞凋亡并使其膜电位降低.     

基因重组α-干扰素治疗慢性粒细胞白血病31例

目的 :观察干扰素治疗慢性粒细胞白血病的疗效。方法 :应用基因重组α干扰素 (IFN α)治疗 31例慢性粒细胞白血病 (CML) ,其中慢性期 (CP) 30例 ,(1例完全缓解病例 ) ,加速期 (AP) 1例。剂量为隔日 30 0万U平均疗程为 9个月 (3～ 4 0个月 )。结果 :单用IFN α治疗CMLCP 5例 ,其中 2例有效 ;联用甲异靛治疗 12例 ,联用羟基脲治疗 14例 ,有效率分别为 91.6 %和 5 7.1% ,与单用甲异靛或羟基脲治疗相比无显著差异。缓解后有 8例单用IFN α维持治持 ,平均持续缓解时间为 6个月。复查Ph+ CML 16例 ,治疗后均未达到完全转阴。结论 :提示IFN α可用于CMLCP和缓解后维持治疗 ,若加大剂量和延长用药时间 ,有可能进一步提高疗效。IFN α对CMLAP无效     

Active compounds-based discoveries about the differentiation and apoptosis of leukemic cells

Acute myeloid leukemia （AML） is a heterogeneous group of hematopoietic malignancies which are characterized by the blockage of hematopoietic cell differentiation with uncontrolled proliferation and/or impaired apoptosis. Over the past 20 years, there has been tremendous progress in the biological, molecular, and cytogenetic aspects of the disease, accompanied by significant advancements in the treatment of AML patients. For example, all-trans retinoic acid （ATRA） and arsenic trioxide （As2O3） have been used clinically for effective treatments of patients with acute promyelocytic leukemia （APL, a unique subtype of AML） through differentiation and/or apoptosis induction. More intriguingly, these active compounds-based chemical biological studies greatly accelerated our understanding on leukemogenesis and targeted therapy of AML patients. Based on some recent findings mainly from our group, this review attempts to summarize the related advances from Chinese researchers.     

人白血病抑制因子（hLIF）单克隆抗体的制备与鉴定

 为了获得抗人白血病抑制因子（hLIF）单克隆抗体,以重组hLIF蛋白为抗原,免疫Balb/c小鼠,采用传统的小细胞融合、无限稀释法制备了10株杂交瘤的腹水hLIF抗体,并对腹水进行了纯化.腹水粗品抗体经rProteinA一步亲和层析法纯化和鉴定后,抗体分子量都符合抗体的特性,抗体的纯度都达到了96.6%以上,抗体亲和常数在1.89×10-9~1.51×10-12mol/L,其中1B8a、5C1b、5G4a细胞株制备的抗体属于高亲和力抗体,可以对其的应用进行进一步的研究和探讨.     

HERG1 K+ channels on the leukemic cells mediated angiogenesis in vitro

Human ether-a-go-go-related gene （HERG1） K^＋ channels are overexpressed in leukemia, which contributes to neoangiogene- sis. The purpose of this study was to investigate the role of HERG1 K^＋ channels on leukemia angiogenesis. We cultured human umbili- cal vein endothelial cells （HUVECs） in conditioned media, which were derived from leukemic cells with or without E-4031, a HERG1 K^＋ channel special inhibitor. The HUVECs proliferation was mea- sured using CCK-8 assay and migration by a Trans-well. Endothelial tube formation was investigated using Matrigel. Vascular endothelial growth factor （VEGF） levels were tested by ELISA and VEGF mRNA expression using RT-PCR. Our results revealed that blocking HERG1 K^＋ channels could inhibit leukemia-induced HUVECs pro- liferation, migration, and tube formation in vitro. The results sug- gested that HERG1 K~ channels could increase leukemia angio- genesis. Furthermore, blockage of HERG1 K^＋ channels could also decrease leukemic cells secreting VEGF and expressing VEGF mRNA. HERG1 K^＋ channels have a promoting effect on leukemia angiogenesis, and the possible mechanism may be that HERG1 K^＋ channels enhance VEGF expression. Thus, HERG1 K4 channel is a potential target of antiangiogenesis in leukemia.     

成人急性白血病淋巴细胞HSP70蛋白及mRNA的表达研究

研究热休克蛋白70(HSP70)在成人急性白血病淋巴细胞中的表达。用W estern blot法检测化疗前、后及正常人HSP70的蛋白表达,RT-PCR法检测其HSP70mRNA的表达。化疗前成人急性白血病淋巴细胞HSP70蛋白表达明显低于正常人(P<0.05);其HSP70mRNA表达的灰度值为(0.112±0.005),明显低于正常(人0.198±0.002)(P<0.05);而化疗后,成人急性白血病淋巴细胞HSP70及其mRNA(0.287±0.001)明显高于正常人(0.198±0.002)(P<0.05)。HSP70在成人急性淋巴细胞白血病淋巴细胞中高表达,对癌细胞起保护作用。     

粉防己碱逆转人早幼粒白血病HL60耐药细胞对三尖杉酯碱的耐药性

无细胞毒性浓度的粉防己碱（０．５ｍｇ·Ｌ－１），明显地增强三尖杉酯碱对人早幼粒白血病ＨＬ６０耐药细胞的生长抑制作用，降低集落形成率，但对敏感ＨＬ６０细胞没有增强作用。ＤＰＨ荧光标记法测定表明，粉防己碱对细胞膜流动性没有影响；提取经药物作用后的细胞ＤＮＡ，琼脂糖凝胶电泳显示，粉防己碱增加三尖杉酯碱引起的ＨＬ６０耐药细胞ＤＮＡ降解，使细胞以编程方式死亡。结果表明：粉防己碱能逆转人早幼粒白血病ＨＬ６０耐药细胞对三尖杉酯碱的耐药性，值得临床上进一步研究。     

同种异基因骨髓移植治疗小儿难治性白血病

目的：本介绍我科近来成功应用同种异体骨髓移植（Ａｌｌｏ－ＢＭＴ）治疗１例小儿复发性白血病的方法、结果和经验体会。资料与方法：１）病例：男性病儿，７岁，急性粒单细胞白血病（Ｍ４ａ）复发，经再次诱导治疗获缓解（ＣＲ２），巩固和强化治疗３疗程后行Ａｌｌｏ－ＢＭＴ；２）供体：同胞弟弟，４岁，组织配型结果ＨＬＡ－Ａ、Ｂ和ＤＲ位点全相合，但红细胞血型不合；３）移植步骤：①预处理，由全身放疗（ＴＢＩ），８００     

Cytotoxic Compounds from Zanthoxylum Americanum

Introduction　　Thenorthernpricklyashtree,Zanthoxylumamericanum(Rutaceae),isnativetoNorthAmerica,rangingfromQuebec,Canada(whereitisknownasClavalier),southtoGeorgiaandwesttoOklahoma,bothofUSA.Ithasalonghistoryofuseformedicinalpurposesandsharesthecommonname“toothachetree”withthesouthernpricklyash,Zanthoxylumclava-herculis.Bothareusedforthereliefoftoothachesbutthenorthernspeciesisusedtoremedymanyothercomplaints.ItwasextensivelyusedbyNativeAmericansand1800'sphysicians[1,2].Earlierphytoche…     

全反式维甲酸三氧化二砷联合化疗治疗急性早幼粒细胞性白血病的临床研究

目的：观察全反式维甲酸、三氧化二砷双诱导联合化疗对急性早幼粒细胞性白血病的疗效和特点．方法：对36例急性早幼粒细胞性白血病患者给予全反式维甲酸、三氧化二砷双诱导,达完全缓解后。序贯应用全反式维甲酸、三氧化二砷,联合小剂量化疗,观察缓解时间和药物不良反应．结果：36例中2例早期因脑出血而死亡,其余均完全缓解,完全缓解率达94．4％,达完全缓解的时间为21～70d．结论：本方案治疗急性早幼粒细胞性白血病能够获得很高的完全缓解率,降低了复发率,缩短了诱导时间,可望长期生存,疗效确切、可靠．