慢性髓细胞白血病患者染色体分析及bcr/abl融合基因转录本定量的临床意义

目的探讨慢性髓细胞白血病(CML)患者染色体分析与bcr／abl融合基因定量的临床应用价值。方法17例CML患者采用骨髓细胞短期培养法制备染色体,应用G、R显带技术进行染色体分析,同时采用实时定量RT-PCR技术进行bcr／abl融合基因定量检测,并对其中的9例患者进行了跟踪观察。结果全部患者均检出Ph染色体及表达bcr／abl融合基因,阳性患者之间19cr／abl表达水平差异很大。常规药物治疗后稳定于慢性期的4例患者,bcr／bal表达水平轻度上升或下降,未发现新的染色体异常;进入急变期的3例患者bcr／abl表达平均上升了9．06倍,均出现新的附加染色体异常;2例异基因骨髓移植的患者bcr／abl表达水平随临床治疗而发生变化;bcr／abl变化趋势相同而细胞遗传学结果不同的患者,对药物治疗的反应不同,预后也不一样。结论染色体分析结合bcr／abl基因定量较为全面地反映了CML患者的生物学特性,与疾病进展密切相关,对CML的诊断、疗效评价、预后判断反映白血病细胞负荷有较大的临床价值。     

Successful mobilization of peripheral blood HPCs with G-CSF alone in patients failing to achieve sufficient numbers of CD34+ cells and/or CFU-GM with chemotherapy and G-CSF

BACKGROUND: Mobilization with chemotherapy and G-CSF may result in poor peripheral blood HPC collection, yielding <2 x 10(6) CD34+ cells per kg or <10 x 10(4) CFU-GM per kg in leukapheresis procedures. The best mobilization strategy for oncology patients remains unclear. STUDY DESIGN AND METHODS: In 27 patients who met either the CD34 (n = 3) or CFU-GM (n = 2) criteria or both (n = 22), the results obtained with two successive strategies-that is, chemotherapy and G-CSF at 10 microg per kg (Group 1, n = 7) and G-CSF at 10 microg per kg alone (Group 2, n = 20) used for a second mobilization course-were retrospectively analyzed. The patients had non-Hodgkin's lymphoma (5), Hodgkin's disease (3), multiple myeloma (5), chronic myeloid leukemia (1), acute myeloid leukemia (1), breast cancer (6), or other solid tumors (6). Previous therapy consisted of 10 (1-31) cycles of chemotherapy with additional chlorambucil (n = 3), interferon (n = 3), and radiotherapy (n = 7). RESULTS: The second collection was undertaken a median of 35 days after the first one. In Group 1, the results of the two mobilizations were identical. In Group 2, the number of CD34+ cells per kg per apheresis (0.17 [0.02-0.45] vs. 0.44 [0.11-0.45], p = 0. 00002), as well as the number of CFU-GM (0.88 [0.00-13.37] vs. 4.19 [0.96-21.61], p = 0.00003), BFU-E (0.83 [0.00-12.72] vs. 8.81 [1. 38-32.51], p = 0.00001), and CFU-MIX (0.10 [0.00-1.70] vs. 0.56 [0. 00-2.64], p = 0.001134) were significantly higher in the second peripheral blood HPC collection. However, yields per apheresis during the second collection did not significantly differ in the two groups. Six patients in Group 1 and 18 in Group 2 underwent transplantation, and all but one achieved engraftment, with a median of 15 versus 12 days to 1,000 neutrophils (NS), 22 versus 16 days to 1 percent reticulocytes (NS), and 26 versus 26 days to 20,000 platelets (NS), respectively. However, platelet engraftment was particularly delayed in many patients. CONCLUSION: G-CSF at 10 microg per kg alone may constitute a valid alternative to chemotherapy and G-CSF to obtain adequate numbers of peripheral blood HPCs in patients who previously failed to achieve mobilization with chemotherapy and G-CSF. This strategy should be tested in prospective randomized trials.     

应用国产ES探针检测慢性髓系白血病的bcr/abl融合及der(9)中间缺失

本研究旨在验证国产LSI bcr/abl ES探针检测慢性髓系白血病(CML)bcr/abl融合基因及衍生9号染色体中间缺失的有效性。应用国产LSI bcr/abl ES探针对97例经骨髓细胞形态学及常规细胞遗传学显带分析确诊的CML患者进行FISH检测,对具有der(9)中间缺失的病例再进行ASS基因探针的FISH检测,并取同期129例染色体核型正常的除外血液肿瘤性疾病及骨髓增殖性疾病患者作为阴性对照。结果显示:97例CML患者中91例染色体核型分析具有经典的t(9;22),6例为变异易位。经FISH检测所有患者均具有bcr/abl融合信号,其中16例具有der(9)中间缺失,占16.5%,在16例der(9)中间缺失的病例中13例具有ASS基因的缺失。129例阴性对照患者均未检测出bcr/abl融合。结论:国产LSI bcr/abl ES探针能有效识别bcr/abl融合及der(9)中间缺失,无假阴性及假阳性结果,ES-FISH检测结果与G显带核型具有很好的一致性。     

慢性粒细胞白血病患者Ph染色体变异易位的细胞遗传学特征与荧光原位杂交研究

本研究探讨慢性粒细胞白血病(CML)中变异Ph染色体易位的细胞遗传学特征并比较双色单融合(DC-SF)与双色双融合(DCDF)bcr／abl探针荧光原位杂交技术(FISH)在变异易位CML中的应用价值。应用常规细胞遗传学方法分析我院42例CML变异Ph易位患者，其中9例进行DC-SF-FISH和1l例进行DC-DF-FISH研究。结果表明：在642例Ph阳性CML中变异易位42例(6.5％)，简单变异易位42.9％(18／42)，复杂变异易位54.8％(23／42)，遮蔽的或隐匿的Ph易位1例。除4，6号染色体外，其余染色体均被累及。4种类型变异易位分别出现于至少2个病例中。变异易位伴附加异常15例(35.7％)。FISH检测bcr／abl阳性19例(95％)，阴性1例。DC-DF-FISH显示除1例患者部分细胞(8.8％)能检测到abl／bcr融合信号外，其他患者皆缺乏该融合信号。但在易位后的9号和参与变异易位的另外染色体上分别可以见到abl和bcr基因信号。DC-SF-FISH不能观察到信号的变异特征。结论：CML变异Ph易位广泛累及除9，22外其他染色体。部分类型属重现性异常；FISH检测能给予精确的分子诊断．而DC-DF-FISH可提供直观的、准确的分子变异特征分析。     

罕见的ins(22;9)t(9;13)/Ph~-慢性髓系白血病实验研究

本文报告1例罕见的具有ins(22;9)t(9;13)的Ph(-)慢性髓系白血病。骨髓细胞经24小时短期培养法制备染色体标本,采用G显带技术进行核型分析;用9号、22号全染色体涂染探针进行染色体涂染;用LSI bcr/abl双色双融合探针进行FISH分析;用实时荧光定量PCR法检测bcr/abl融合基因转录本及其拷贝数。结果表明,染色体核型为45,XX,der(9)t(9;13)(q34;q10),-13[20],abl基因插入到der(22)形成插入性的bcr/abl基因重排;实时荧光定量PCR检测到bcr/abl融合基因。结论:插入性的bcr/abl基因重排是t(9;22)的一种罕见的变异类型,可用分子学方法检测,但全染色体涂染及常规的染色体显带分析容易导致误诊。     

1例伴有t(9;22)和ins(3;8)的慢性粒细胞白血病的临床和实验研究

目的报道1例伴有ins(3;8)的慢性粒细胞白血病(CML)病例及其3号、8号全染色体涂染、双色间期荧光原位杂交(FISH)、实时荧光定量PCR研究结果。方法骨髓细胞经直接法或24 h短期培养法制备染色体标本,R显带技术进行核型分析;3号、8号全染色体涂染探针进行染色体涂染;bcr/abl双色双融合探针进行FISH分析;实时荧光定量PCR检测bcr/abl融合基因转录本及其拷贝数。结果骨髓细胞R显带核型分析提示,除t(9;22)外,所有细胞伴ins(3;8);全染色体涂染证实3号染色体上插入一段8号来源的染色体片段;双色FISH检测到bcr/abl基因重排;实时荧光定量PCR检测到bcr/abl融合基因(b3a2)转录本。结论ins(3;8)是CML患者罕见的附加染色体异常;全染色体涂染是明确染色体插入易位的可靠手段。     

Molecular-cytogenetic monitoring of different regimens of treatment in patients with chronic myeloid leukemia

AIM: To conduct molecular-cytogenetic monitoring of bone marrow cells in different regimens of chronic myeloid leukemia (CML) treatment. MATERIAL AND METHODS: A total of 651 samples of bone marrow from 319 CML patients were studied. 229 patients received polychemotherapy and 90 patients--interferon-alpha. Primary examination and monitoring of the treatment efficacy were performed using G-differential chromosome staining. Fluorescent in situ hybridization (FISH) was made in 75% cases. RESULTS: Interferon therapy resulted in a significant increase in the number of complete and significant cytogenetic responses. With aggravation of the disease the above responses occurred less frequently while minor and no response are encountered more often. Treatment with interferon-alpha in combination with chemotherapy is much more effective than monotherapy with interferon. CONCLUSION: G-differential chromosome staining karyotypes metaphases and detects clonal chromosome restructuring. Molecular-cytogenetic methods study chromosome restructuring at DNA level. FISH detects chimeric gene bcr/abl in cases when Ph-chromosome is not detectable by standard cytogenetic methods.     

慢性髓系白血病首发血小板显著增多

本研究探讨以血小板显著增多首发的慢性髓系白血病（CML）临床、细胞遗传学及分子生物学特征。应用骨髓细胞涂片、骨髓活检观察细胞形态学改变;RT-PCR检测bcr／abl融合基因;常规染色体核型分析及FISH检测细胞遗传学变化。结果发现：以血小板显著增多为首发表现的CML是一组具有独特临床和生物学特点的疾病,骨髓细胞涂片和骨髓活检表明,骨髓增生活跃,以巨核系异常增生为主,血小板大片戍堆,可见圆形核小巨核细胞,中等度白细胞增多,经细胞遗传学和分子生物学检测均证实存在有Ph染色体和（或）表达bcr／abl融合基因,对此类患者应该早期进行积极治疗,甚至进行分子生物学水平的干预;而原发性血小板增多症（ET）患者则不宜过多地使用化疗药物,否则反而诱致白血病的发生。结论：对血小板明显增多的患者应及时进行Ph染色体及bcr／abl融合基因表达水平的检测．这对于ET及CML的诊断和鉴别诊断极为重要,以避免误诊、误治。     

双色双融合荧光原位杂交探针检测慢性髓系白血病Bcr／Ab1基因重排的研究

本研究探讨双色双融合荧光原位杂交技术（DC-DF-FISH）在慢性髓系白血病（CML）中的应用价值,应用常规R-显带技术、DC-DF-FISH、RT—PCR技术检测41例CML患者的染色体核型及bcr／abl融合基因。结果表明,对于初诊CML的18例患者,R-显带显示Ph染色体阳性检出率为94．4％（17／18）,DC—DF—FISH阳性检出率也为94．4％（17／18）,对于治疗后CML的18例患者,R-显带显示14例有可分析分裂相,其中有ll例存在Ph染色体,阳性检出率为78．6％（11／14）;而用DC—DF—FISH检测治疗后患者的阳性率为94．4％（17／18）;移植后的5例患者R-显带均未检出Ph染色体,而FISH检测出1例bcr／abl基因阳性,RT-PCR证实了FISH的检测结论,但在移植患者中,RT-PCR无阳性发现。结论：双色双融合荧光原位杂交技术具有高度的准确性、可靠性,是检测CML患者bcr／abl基因重排的可靠方法,适用于CML的诊断、疗效判定及微小残留病灶的检测。     

STR-PCR联合RT-PCR技术在慢性髓细胞白血病患者异基因造血干细胞移植后微小残留病变检测中的应用

为了探究STR PCR联合bcr/abl融合基因转录本RT PCR定性检测技术对慢性髓细胞白血病 (CML)异基因造血干细胞移植 (allo HSCT)后复发的预测价值 ,对接受allo HSCT的 2 4例CML患者进行微小残留病变(MRD)的动态检测 ,对供体细胞嵌合率 (DC)采用复合扩增荧光标记STR PCR结合毛细管电泳方法进行定量检测 ,对bcr/abl融合基因转录本采用巢式RT PCR方法检测。结果显示 :移植后长期处于完全供体细胞嵌合状态(FDC)即DC≥ 95 %的患者bcr/abl均转为阴性 ,MRD消失 ;稳定混合嵌合状态 (MC)即 90 %≤DC <95 % ,并且bcr/abl阴性的患者 ,也可达到分子水平的缓解并长期生存 ;但是bcr/abl的阳性结果并不总是与复发相关 ,只有当DC进行性下降 (DC <90 % ) ,而同时bcr/abl阳性时 ,才有复发或植入失败的可能 ,对该类患者应尽早实施临床干预性治疗。本研究中有 5例患者出现DC下降和MRD阳性 ,其中 3例为分子水平复发 ,1例为细胞遗传学水平复发 ,1例为植入失败。结论 :STR PCR在敏感范围内 ,其结果与RT PCR的结果符合率高 ,两种技术的结合是一种检测MRD高度敏感的手段 ,可检出allo HSCT后发生分子生物学或细胞遗传学复发的高危患者。     

bcr/abl反义寡核苷酸净化后自体骨髓移植治疗慢性粒细胞白血病

目的　观察bcr/abl反义寡核苷酸 (AS ODN)净化后自体骨髓移植 (ABMT)治疗慢性粒细胞白血病 (CML)的疗效。方法　 5例CML中慢性期 2例 ,加速期 1例 ,急变期 2例 ,均具b3a2型bcr/ablmRNA。骨髓采集前患者均经 2个疗程大剂量联合化疗的体内净化 ,自体骨髓经CS30 0 0plus浓集后加入 18bp的硫代bcr/ablAS ODN(40～ 6 0 μg/ml,48～ 6 0h)体外净化Ph 细胞。预处理方案为全身照射 环磷酰胺 (TBI CTX)或马法兰、阿糖胞苷、CTX和环己亚硝脲 (MAC CCNU)。结果　体内净化后骨髓Ph 细胞减至 34 % (2 4%～ 46 % ) ,bcr/ablmRNA( )的CFU GM减至 45 .6 % (33%～ 5 8% )。经bcr/ablAS ODN净化后 ,2例骨髓bcr/ablmRNA(- ) ,3例bcr/ablmRNA( ) ,但bcr/ablmRNA( )的CFU GM明显减少。 5例ABMT后造血重建有延迟现象。经 2年以上随访观察 ,3例移植后持续 9～ 12个月主要遗传学缓解 (MCR) ,且移植后慢性期明显延长 ,其中 1例急变期患者至今无须治疗 ,现已无病生存 37个月 ,bcr/ablmRNA(- )。 1例急变期患者仅获短暂MCR ,移植后 7个月急变期复发 ,1例移植后第 74天因造血重建延迟而感染、出血死亡。结论　bcr/ablAS ODN净化后ABMT可使部分患者取得相当一段时期的MCR及延长慢性期。     

bcr/abl mRNA反义寡核苷酸对慢性粒细胞白血病Ph~ 细胞的作用

Ph~ 慢性粒细胞白血病(CML)的bcr/abl融合基因在其发病机制中具有重要作用。为研究bcr/abl反义寡核苷酸对CML细胞的作用,将合成两种18个碱基的bcr/abl硫代反义寡核苷酸与相应CML细胞系(K562细胞)及患者细胞共同孵育。结果发现,bcr/abl反义寡核苷酸可明显抑制K562细胞生长;对CML细胞CFU-GM抑制率为54％—91％,部分病例CFU-GM可有bcr/abl mRNA消失而PCR检测为阴性。上述抑制都是序列特异性的,与剂量呈正相关关系。通过流式细胞仪PI染色分析DNA含量,检测具有凋亡间接特征的亚二倍体细胞数量,发现反义寡核苷酸诱导细胞凋亡是其主要作用机制。本实验为bcr/abl反义寡核苷酸CML基因治疗及体外骨髓净化提供了依据。     

Allogeneic blood progenitor cell collection in normal donors after mobilization with filgrastim: the M.D. Anderson Cancer Center experience

BACKGROUND: Information on the safety and efficacy of allogeneic peripheral blood progenitor cell (PBPC) collection in filgrastim-mobilized normal donors is still limited. STUDY DESIGN AND METHODS: The PBPC donor database from a 42-month period (12/94-5/98) was reviewed for apheresis and clinical data related to PBPC donation. Normal PBPC donors received filgrastim (6 microg/kg subcutaneously every 12 hours) for 3 to 4 days and subsequently underwent daily leukapheresis. The target collection was > or =4 x 10(6)CD34+ cells per kg of recipient's body weight. RESULTS: A total of 350 donors were found to be evaluable. Their median age was 41 years (range, 4-79). Their median preapheresis white cell count was 42.8 x 10(9) per L (range, 18.3-91.6). Of these donors, 17 (5%) had inadequate peripheral venous access. Leukapheresis could not be completed because of apheresis-related adverse events in 2 donors (0.5%). Of the 324 donors evaluable for apheresis yield data, 221 (68%) reached the collection target with one leukapheresis. The median CD34+ cell dose collected (first leukapheresis) was 462 x 10(6) (range, 29-1463).The main adverse events related to filgrastim administration in donors evaluable for toxicity (n = 341) were bone pain (84%), headache (54%), fatigue (31%), and nausea (13%). These events were rated as moderate to severe (grade 2-3) by 171 (50%) of the donors. In 2 donors (0.5%), they prompted the discontinuation of filgrastim administration. CONCLUSION: PBPC apheresis for allogeneic transplantation is safe and well tolerated. It allows the collection of an "acceptable" PBPC dose in most normal donors with one leukapheresis, with minimal need for invasive procedures.     

The predictive value of white cell or CD34+ cell count in the peripheral blood for timing apheresis and maximizing yield

BACKGROUND: The collection of peripheral blood stem and progenitor cells (PBPCs) for transplantation can be time-consuming and expensive. Thus, the utility of counting CD34+ cells and white cells (WBCs) in the peripheral blood was evaluated as a predictor of CD34+ cell yield in the apheresis component. STUDY DESIGN AND METHODS: The WBC and CD34+ cell counts in the peripheral blood and the apheresis components from 216 collections were assessed. Sixty-three patients underwent mobilization with chemotherapy plus filgrastim, and 17 patients and 14 allogeneic PBPC donors did so with filgrastim alone. The relationship between the number of WBC and CD34+ cells in the peripheral blood and in the apheresis component was analyzed by using rank correlation and linear regression analysis. RESULTS: The correlation coefficient for CD34+ cells per liter of peripheral blood with CD34+ cell yield (x 10(6)/kg) was 0.87 (n = 216 collections). This correlation existed for many patient and collection variables. However, patients with acute myeloid leukemia had fewer CD34+ cells in the apheresis component at any level of peripheral blood CD34+ cell count. Components collected from patients with CD34+ cell counts below 10 x 10(6) per L in the peripheral blood contained a median of 0.75 x 10(6) CD34+ cells per kg. When the WBC count in the blood was below 5.0 x 10(9) per L, the median number of CD34+ cells in the peripheral blood was 5.6 x 10(6) per L (range, 1.0-15.5 x 10(6)/L). A very poor correlation was found between the WBC count in the blood and the CD34+ cell yield (p = 0.12, n = 158 collections). CONCLUSION: The number of CD34+ cells, but not WBCs, in the peripheral blood can be used as a predictor for timing of apheresis and estimating PBPC yield. This is a robust relationship not affected by a variety of patient and collection factors except the diagnosis of acute myeloid leukemia. Patients who undergo mobilization with chemotherapy and filgrastim also should undergo monitoring of peripheral blood CD34+ cell counts, beginning when the WBC count in the blood exceeds 1.0 to 5.0 x 10(9) per L.     

Ph染色体和bcr-abl融合基因的动态监测在慢性粒细胞白血病治疗中的临床意义

目的评价Ph染色体和bcr-abl融合基因检测在慢性粒细胞白血病诊断、治疗及微小残余病变监测中的临床意义。方法应用常规染色体显带技术、半定量反转录PCR(RT-PCR)技术和实时荧光定量PCR(RQ-PCR)技术对20例患者Ph染色体及bcr-abl融合基因进行动态监测,随诊3年。结果 20例慢性粒细胞白血病患者,19例患者Ph染色体阳性,20例均有bcr-abl融合基因阳性,其中11例应用伊马替尼治疗患者中9例患者Ph染色体和bcr-abl融合基因消失,提示遗传学缓解率为81.8%。9例应用常规化疗的患者随诊3年,Ph染色体和bcr-abl融合基因均未转阴。结论 Ph染色体和bcr-abl融合基因动态监测对慢性粒细胞白血病患者诊断、治疗、病情监测及预后判断有重要临床意义。     

慢性髓系白血病患者移植造血干细胞后bcr／abl融合基因变化的实时定量RT-PCR监测及其意义

为了探讨Ph阳性慢性髓系白血病（CML）患者异基因造血干细胞移植后不同时期bcr／abl融合基因水平变化的实时定量PCR监测及其意义，对21例CML患者骨髓移植后不同时期bcr／abl融合基因水平用实时定量PCR技术进行了连续监测。结果表明：21例bcr／abl融合基因阳性CML患者移植后7例未检测出融合基因，14例移植后1—6月仍可检出不同水平bcr／ab／融合基因。动态观察发现，9例bcr／abl融合基因处于较低水平，相对数在0．0074％～0．088％，于移植后第3—7月转为阴性。5例符合分子生物学复发标准，融合基因相对数在0．077％-75％。其中1例在骨髓移植后1、2、3个月融合基因相对数分别为0．95％、1．5％、0．16％，于移植后4个月自行转阴性；2例接受同一供者单个核细胞输注后bcr／abl转为阴性；2例发展为临床血液学复发，其中1例经化疗及同供者单个核细胞输注再次缓解，但bcr／abl阳性，另1例不治死亡。结论：对于ph阳性CML患者骨髓移植后连续定量监测bcr／abl融合基因水平可以了解疾病残留状态，预测分子学生物学复发，指导临床治疗，并评价疗效。     

bcr/abl融合基因对β1整合素和L-选择素基因表达的影响

目的 研究ber／abl融合基因对β1整合素和L-选择素表达的影响。方法 应用半定量RT-PCR方法检测ber／abl融合基因阴性和阳性的慢性髓系白血病(CML)细胞中β1整合素和L-选择素mRNA的表达水平。同时观察酪氨酸激酶抑制剂Rb-C-Box基因转染bcr／abl基因阳性细胞后β1整合素和L-选择素mRNA表达水平的变化。结果 在bcr／abl基因阳性细胞中，L-选择素mRNA表达水平明显低于ber／abl阴性细胞，转入Rb-C-Box基因后，L-选择素mRNA的表达水平与ber／abl阴性细胞相似。bcr／abl阴性和阳性细胞及转染Rb-c-Box基因细胞中β1整合素mRNA表达水平差异均无显性。结论 ber／abl融合基因可抑制CML细胞中L-选择素mRNA的表达，对β1整合素mRNA的表达影响较小。     

慢性粒细胞性白血病患者骨髓源bcr/abl融合基因阳性Flk1+CD31-CD34-干细胞体外抗STI571机制的初步研究

为进一步了解STI571对慢性粒细胞性白血病（CML）患者体内bcr/abl融合基因阳性的原始及定向白血病干/祖细胞分化及增殖的影响,更深入阐明部分CML患者在经历一段血液学甚至是细胞遗传学水平上的完全缓解后复发及对STI571的耐药机制,利用从CML患者骨髓分离到的具有血管母细胞特性、bcr/abl融合基因阳性、免疫表型为Flk1＋CD31-CD34-细胞,体外检测了STI571对其在造血集落培养基中的分化及处于分化阶段时的增殖抑制作用.结果显示：浓度为5 μmol/L STI571,维持作用96小时（病人体内维持96小时的STI571浓度只可能达到1-2 μmol/L）,即可有效抑制定向造血祖细胞的增殖.没有充分的证据显示,相对原始的bcr/abl融合基因阳性、免疫表型为Flk1^＋CD31^-CD34^-细胞的分化及增殖受到明显的抑制作用.结论：CML患者体内的原始白血病干/祖细胞对STI571具有一定的抗性,临床上所观察到的CML患者在运用STI571一段时间后出现正常的造血恢复现象,可能仅仅是因为STI571杀死或抑制了定向恶性白血病祖细胞的增殖,但随着时间的推移,在经历了短暂的血液学甚至是细胞遗传学水平上的缓解后,对STI571耐药的原始白血病干/祖细胞终究会再次导致CML的复发.     

线粒体途径在慢性髓系白血病信号转导中的作用

本研究旨在探讨线粒体途径在慢性髓系白血病（CML）信号转导中的作用。用脂质体转染法将bcr3／abl2反义寡核苷酸（ASO）导入CML细胞系K562细胞中;用MTr法检测bcr3／abl2 ASO对K562细胞活力的影响;流式细胞术（FCM）分析测定细胞凋亡率;荧光染料罗丹明123染色分析细胞线粒体跨膜电位（△ψm）的变化;Western blot检测线粒体凋亡信号转导通路相关蛋白细胞色素C（CytC）的表达。结果表明,2μmol／Lbcr3／abl2 ASO与K562细胞作用24小时后,可明显抑制K562细胞活力,其抑制率为65．7％;可诱导细胞凋亡,凋亡率为16．9％;可下调K562细胞线粒体△ψm,有38．33％的细胞出现线粒体△ψm下降;可增强CytC的表达,激光光度扫描仪测得其表达光密度值由2．33±0．3升高到4．78±0．1。结论：线粒体途径通过介导凋亡信号而在CML信号转导中发挥重要作用。