SDF-1/CXCR4在小儿急性白血病中的表达及其意义

本研究探讨儿童急性白血病(AL)血浆基质细胞衍生因子-1(SDF-1)的水平和骨髓细胞SDF-1受体CXCR4的表达与髓外浸润的关系。分别收集48例AL患儿、20例非恶性血液病患儿(对照组)外周血浆及骨髓细胞,采用ELISA法分别检测AL患儿和对照组儿童外周血浆SDF-1水平;用流式细胞术检测AL患儿和对照组儿童骨髓细胞CXCR4的表达。结果表明:血浆SDF-1水平及骨髓细胞CXCR4表达,在AL组明显高于对照组(p<0.001),在急性淋巴细胞白血病(ALL)组明显高于急性髓细胞白血病(AML)组(p<0.01),在髓外浸润组也高于非髓外浸润组(p<0.05)。结论:SDF-1和CXCR4在AL儿童呈高水平表达,与白血病的类型、骨髓白血病细胞的迁移、浸润密切相关。     

CXCR4／SDF-1在肺癌中的表达研究

目的探讨肺癌患者外周血、胸水以及肿瘤组织中骨髓基质细胞衍化生长因子（SDF-1）及其趋化性细胞受体因子4（CXCR4）的表达及其临床意义。方法以酶联免疫吸附试验（ELISA）检测41例肺癌患者及12名正常人的外周血和／或胸水中的SDF-1表达，以免疫组化的方法检测肺癌组织中CXCR4的表达。结果41例肺癌患者外周血SDF-1表达高于正常对照组（P〈0．01），且晚期肺癌患者的表达高于早期患者，恶性度高的表达高于恶性度低的。但在胸水中SDF-1的表达没有差异。肺癌组织中CXCR4的表达强度与肿瘤的分化密切相关。结论肺癌外周血清SDF-1和肿瘤组织CXCR4的高表达与肺癌密切相关，且其高表达可能与肺癌的恶性程度和转移有关。     

SDF-1/CXCR4轴与血管新生

基质细胞衍生因子-1(SDF-1)及其特异性受体CXCR4所构成的SDF-1/CXCR4轴,在骨髓造血干细胞回髓以及恶性血液肿瘤的浸润、耐药等方面起着重要的作用,这些方面的研究已日益受到广泛关注。近年来的研究发现,SDF-1/CXCR4与血管新生过程可能有着密切的关系。本文就此作一综述。     

SDF-1／CXCR4轴与血管新生

基质细胞衍生因子-1(SDF-1)及其特异性受体CXCR4所构成的SDF-1／CXCR4轴，在骨髓造血干细胞回髓以及恶性血液肿瘤的浸润、耐药等方面起着重要的作用，这些方面的研究已日益受到广泛关注。近年来的研究发现，SDF-1／CXCR4与血管新生过程可能有着密切的关系。本文就此作一综述。     

基质细胞衍生因子-1及其受体CXCR4在进展期胃癌中的表达及意义

目的 研究趋化因子基质细胞衍生因子-1(SDF-1)及其受体CXCR4与胃癌生物学行为的关系,探讨SDF-1/CXCR4轴在胃癌侵袭、转移中的生物学意义.方法 应用免疫组化EnVision两步法检测58例胃癌组织中SDF-1、CXCR4的表达.结果 (1)SDF-1、CXCR4在胃癌组的阳性表达率分别为87.9%、56.9%,显著高于切缘对照组的47.8%、30.4%,差异有显著性(P<0.05);(2)SDF-1和CXCR4的表达在淋巴结转移组高于无转移组(P<0.05),SDF-1、CXCR4表达程度与淋巴结转移、浆膜侵犯、临床分期指标相关(P<0.05);(3)SDF-1与CXCR4的表达呈正相关(P<0.05).结论 胃癌细胞SDF-1、CXCR的表达水平与胃癌的发生、侵袭及淋巴结转移密切相关,可作为预测胃癌淋巴结转移及预后的免疫病理学指标;胃癌细胞可能通过SDF-1/CXCR4生物轴促进肿瘤的浸润和转移,提示SDF-1可能是药物靶向治疗的重要靶点.     

以SDF-1/CXCR4为靶点治疗血液肿瘤的研究进展

基质细胞衍生因子-1(SDF-1)是一种主要由骨髓基质细胞合成释放的趋化因子,属CXC亚家族成员。SDF1与其表达于正常造血干/祖细胞和多种血液肿瘤细胞表面的受体CXCR4特异性结合及相互作用,在造血调控及血液肿瘤转归中具有重要作用。本文就以SDF1/CXCR4为靶点治疗血液系统肿瘤的有关研究进展作一综述。     

乳腺癌患者外周血中趋化因子及其受体的研究

目的研究乳腺癌患者外周血中趋化因子及其受体表达变化在乳腺癌发病机制中的作用。方法采用酶联免疫吸附试验(ELISA)检测30例乳腺癌患者及健康者血清中单核细胞趋化蛋白1(MCP-1)、活化后可调节的、正常T细胞表达和分泌物因子(RANTES)、白介素8(IL-8)及间质细胞衍生因子1(SDF-1)等水平变化。同时用流式细胞仪分析外周血CD3~+T淋巴细胞表面趋化因子受体CCR2、CCR5、CXCR1、CXCR4的表达。结果与健康者相比,乳腺癌患者血清中SDF-1及RANTES水平显著升高(均P0.01),外周血CD3~+T淋巴细胞表面趋化因子受体表达水平无显著性差异。结论乳腺癌患者血清SDF 1及RANTES水平升高可能在乳腺癌的发病及进展过程中发挥作用。     

狼疮肾炎患者外周血中趋化因子受体CXCR4及其配体SDF—1α的表达研究

目的探讨趋化因子受体CXCR4及其配体基质细胞衍生因子-1（SDF-1）在狼疮肾炎（LN）外周血中的表达水平及意义。方法用流式细胞术分别检测健康对照组、LN患者组、非肾损害系统性红斑狼疮（SLE）患者组的外周血中CD3＋CD4＋T淋巴细胞、CD5＋CD8＋T淋巴细胞表面CxCR4的表达,采用双抗体夹心ABC—ELISA法检测以上各组血清SDF-1α浓度水平。结果健康对照组外周血中CD3＋CD4＋T淋巴细胞、CD3＋CD8＋T淋巴细胞表面CXCR4表达及SDF-1α表达水平均明显低于狼疮肾炎组和非肾损害SLE组,而非肾损害SLE患者组外周血中CD3＋CD4＋T淋巴细胞、CD5＋CD8＋T淋巴细胞表面CXCR4表达及SDF-1α表达水平也均明显低于LN组。结论SLE患者发病与CXCR4／SDF-1α高表达有关,LN患者发病与CXCR4／SDF—1α高表达有密切关系,提示CXCRd／SDF-1α可能在LN的发病中起重要作用。     

小鼠肿瘤坏死因子α增强造血干/祖细胞归巢效率的机制研究

目的 探讨肿瘤坏死因子(TNF)α在调节造血干/祖细胞(HS/PC)归巢中的增效作用及其机制.方法 将荧光染料CFSE标记的脐血CD34+细胞移植入接受照射(对照组)或联合TNFα预处理(实验组)的BALB/c受鼠.移植后20 h,采用流式细胞术(FACS)检测脐血CD34+细胞在BALB/c受鼠中的分布(外周血、肝脏、肺脏)与归巢(骨髓、脾脏)特征,计算其相应的归巢效率;酶联免疫吸附实验(ELISA)检测BALB/c受鼠血清基质衍生因子(SDF)-1α水平;FACS检测TNFα预处理前、后脐血CD34+细胞表面CXCR4表达水平的变化;免疫组化法检测BALB/c受鼠骨髓及脾脏组织切片中SDF-1α的表达水平.结果 脐血CD34+细胞主要归巢于BALB/c受鼠骨髓和脾脏;经TNFα预处理的实验组BALB/c受鼠骨髓归巢率[(0.65±0.13)%]显著高于对照组[(0.30±0.09)%,P<0.01];但TNFα预处理同时显著抑制脐血CD34+细胞归巢于BALB/c受鼠脾脏(P<0.01);不同剂量的TNFα预处理不影响受鼠血清SDF-1α水平;新鲜分离的脐血CD34+细胞与不同浓度TNFα共孵育18 h后,其表面CXCR4表达水平并无明显变化;但TNFα预处理受鼠骨髓龛组成细胞SDF-1α表达增高,且脾脏红髓区小梁动脉和小梁静脉内皮细胞SDF-1α表达增高.结论 TNFα通过提升骨髓龛SDF-1α浓度梯度促进HS/PC归巢于骨髓,这一发现将有助于为临床提供可行性HS/PC归巢增效剂.     

基质细胞衍生因子-1α及其受体CXCR4在急性白血病的表达及与髓外浸润的关系

为了探讨基质细胞衍生因子-1α(stromal cell derived factor-1α,SDF-1α)及其受体CXCR4在急性粒细胞、单核细胞、淋巴细胞三系白血病的表达及与髓外浸润的关系,对66例急性白血病中的急性淋巴细胞白血病(ALL)患者组(31例)、急性粒细胞白血病(M2)患者组(20例)、急性单核系细胞白血病(M4+M5)患者组(15例)、髓外浸润患者组(41例)、非髓外浸润患者组(25例),应用酶联免疫吸附实验(ELISA)及流式细胞术分别检测SDF-1α及其受体CXCR4在三组白血病外周血及骨髓白血病细胞上的表达。结果表明:ALL患者组、M4+M5患者组、M2患者组及正常对照组血浆的SDF-1α水平分别为1317.87±220.76,1339.79±187.06,1063.70±190.74,1908.34±135.55(pg/ml),其中ALL患者和M4+M5患者组高于M2患者组,但均明显低于正常对照组(P<0.01)。髓外浸润患者组及非髓外浸润患者组SDF-1α血浆水平分别为1252.49±263.12、1234.91±185.50,(pg/ml),组间无显著差别。CXCR4在ALL患者组、M4+M5患者组、M2患者组白血病细胞上表达的平均荧光强度(MFI)为78.47±33.96、67.21±24.29、41.66±17.18,ALL患者组及M4+M5患者组明显高于M2患者组(P<0.05)。ALL患者组、M4+M5患者组间无显著性差别。髓外浸润患者组CXCR4表达的MFI(81.72±27.63)明显高于非髓外浸润患者组(36.94±11.86)(P<0.05)。结论:急性淋巴细胞、单核细胞系白血病细胞趋化因子受体CXCR4高表达可能是其易发生髓外浸润的分子机制,3组白血病患者外周血SDF-1α表达水平均降低且与髓外浸润无明显相关,髓外浸润可能更取决于受浸润脏器局部SDF-1α表达水平。     

p57kip2在初发MDS患者的表达及与SDF-1/CXCR4信号的关系

本研究旨在探讨初发骨髓增生异常综合征(MDS)患者抑癌基因p57kip2的表达及其与SDF-1/CXCR4信号的关系在MDS发病中的作用。应用实时荧光定量PCR检测67例初发MDS患者骨髓单个核细胞中p57kip2及CXCR4的表达,流式细胞术检测MDS患者骨髓CD34+细胞百分比,并选择18例正常人骨髓作为对照。在体外实验中探讨SDF-1/CXCR4信号对p57kip2表达的影响,比较其作用在正常及MDS患者中的差异。结果表明,MDS患者p57kip2表达均显著低于正常对照组(P<0.001),且与骨髓CD34+细胞百分比呈负相关(r=-0.458,P<0.001),染色体核型异常MDS患者p57kip2表达低于正常核型者(P=0.045);CXCR4的表达在MDS患者及对照组间无统计学差异,但与p57kip2表达呈正相关(r=0.652,P<0.001)。正常人中,SDF-1剂量依赖性地促进骨髓单个核细胞中p57kip2的表达,该作用能被AMD3100阻断;而在MDS患者BMMNC中,SDF-1不能诱导p57kip2表达增加。结论:抑癌基因p57kip2在初发MDS患者中低表达,可能与MDS发病相关。     

Berberine inhibits SDF-1-induced AML cells and leukemic stem cells migration via regulation of SDF-1 level in bone marrow stromal cells

Berberine plays a prominent role on the control of tumor cell invasion and migration. SDF-1 is a homeostatic chemokine that signals through CXCR4 which is expressed by hematopoietic tumor cells. The SDF-1/CXCR4 axis is involved in the migration process of leukemic cells. In this study, we investigated the effects of berberine on the SDF-1-induced HL-60 cells, primary acute myeloid leukemia (AML) cells and leukemic stem cells (LSCs) migration. Transwell migration chambers (8 μm) were used to assess the role of berberine on leukemic cell migration; Flow cytometry was used to analyze the role of berberine on the CXCR4 expression; SDF-1 protein level secreted by bone marrow stromal cells (BMSCs) was evaluated by ELISA. Results demonstrated that berberine could partly inhibit SDF-1-induced AML cells as well as LSCs migration. Berberine could reduce SDF-1 protein level secreted by BMSCs in the microenvironment but not affect CXCR4 expression on HL-60 cell membrane, and we hypothesized that berberine could inhibit AML cells migration partly by reducing the secreting of SDF-1 by BMSCs and inhibiting HERG1 K⁺ channels of leukemic cells. Therefore, it is speculated that berberine might be a potentially effective agent for prevention of leukemia.     

基质细胞衍生因子-1受体CXCR7在急性白血病细胞的表达及意义

目的研究基质细胞衍生因子-1(SDF-1)受体CXCR7在急性白血病(AL)细胞株和AL患者骨髓细胞中的表达及意义。方法使用RPMI-1640培养基培养人单核细胞白血病细胞株(THP-1细胞)、人原髓细胞白血病细胞株(HL-60细胞)和人T淋巴细胞白血病细胞株(Jurkat细胞),分离急性髓系白血病(AML)患者和急性淋巴细胞白血病(ALL)患者和正常人骨髓单个核细胞,抽取新鲜骨髓2 ml/(人)份,分为ALL组、AML组和正常组,用流式细胞仪和Western blot法观察各组CXCR7蛋白的表达情况。结果 1)CXCR7表达水平:THP-1细胞为(69.05±3.04)%,HL-60细胞为(20.17±1.53)%,Jurkat细胞为(3.41±2.46)%,THP-1细胞表达高于HL-60细胞(P0.01),而HL-60细胞表达又明显高于Jurkat细胞(P0.01)。2)CXCR7表达水平:AML组为(19.03±3.84)%,ALL组为(3.34±1.71)%,正常组为(2.40±1.27)%,AML组与正常组、ALL组相比,CXCR7表达水平明显增加(P0.01),ALL组与正常组对比,差异无统计学意义(P0.05)。结论 AML患者和HL-60细胞的CXCR7表达均明显增高,提示其在AML的发生、发展中可能具有有重要作用,并可能成为1种新的血液肿瘤诊断及治疗的思路和靶点。     

SDF-1／CXCR4轴在人脐血源基质细胞促进巨核细胞增殖中的作用

本研究探讨基质细胞衍生因子（stromal cell derived factor-1,SDF-1）及其受体CXCR4在人脐血源基质细胞（human umbilical cord blood-derived stromal cells,hUCBSCs）促进巨核细胞增殖中的作用。以巨核细胞系HEL细胞作为研究对象,实验分HEL／hUCBSC共培养组、HEL／骨髓基质细胞（human bone marrow stromal cells,hBMSCs）共培养组和HEL悬浮培养组。应用ELISA法检测huCBSC和hBMSC培养上清SDF-1水平,应用激光共聚焦和流式细胞仪检测HEL细胞CXCR4蛋白表达,RT—PCR检测CxcR4mRNA表达。结果表明：hUCBSC高分泌表达SDF-1,其分泌高峰在培养第8天,稍迟于hBMSCs。与hUCBSCs共培养的HEL细胞,流式细胞仪和激光共聚焦检测均显示其CXCR4蛋白的表达较弱（P〈0．05）,且可在部分HEL细胞胞浆中发现红色点状荧光。RT-PCR检测结果显示,不同培养条件下HEL细胞CXCR4mRNA表达无显著性差异（P〉0．05）。结论：hUCBSC在分泌SDF-1和调控巨核细胞表达CXCR4方面起重要作用。     

Stromal cell-derived factor-1 and CXCR4 receptor interaction in tumor growth and metastasis of breast cancer.

Stromal cell-derived factor-1 (SDF-1)/CXCR4 interaction is critical for the trafficking of lymphocytes, homing and retention of hematopoietic stem cells within the bone marrow and is essential in fetal hematopoiesis. Binding of SDF-1 to CXCR4 activates a variety of intracellular signal transduction pathways and effector molecules that regulate cell survival, proliferation, chemotaxis, migration and adhesion. Recently, intensive research has demonstrated that SDF-1/CXCR4 interaction also regulates several key events in wide variety of cancers. Serum-depleted media in the presence of SDF-1 protected the breast cancer cells from apoptosis. CXCR4-low-expressing MCF-7 formed small tumor at inoculated site in SCID mice 8-9 weeks after inoculation while completely failed to metastasis into various organs. In contrast, CXCR4-high-expressing MDA-231 cells were most efficient in the formation of a large tumor and organ-metastasis within 3 weeks in SCID mice. This review briefly focuses on the role of SDF-1/CXCR4 interaction in tumor growth and metastasis of breast cancer cell both in vitro and in vivo.     

Enhanced recruitment and hematopoietic reconstitution of bone marrow‐derived mesenchymal stem cells in bone marrow failure by the SDF‐1/CXCR4

Aplastic anemia (AA) is a bone marrow failure disease. It is difficult to treat AA, and in addition, relapses are common because of its complex disease pathogenesis. Allogeneic bone marrow‐derived mesenchymal stem cells (BMSCs) infusion is an effective and safe treatment option for the AA patients. However, it found that BMSCs infusion in AA patients is less than 30% effective. Therefore, the key to improve the efficacy of BMSCs treatment in these patients is to enhance their homing efficiency to the target sites. Studies have shown that stromal cell‐derived factor‐1 (SDF‐1)/CXC chemokine receptor 4 (CXCR4) axis plays an important role in promoting BMSCs homing. In this study, human BMSCs were transduced with lentivirus stably expressing CXCR4‐BMSCs. Transduced BMSCs resemble normal BMSCs in many ways. Migration ability of CXCR4‐BMSCs toward SDF‐1 was increased because of the overexpression of CXCR4. In the mice with bone marrow failure, the migration and colonization ability of CXCR4‐BMSCs to the bone marrow was significantly improved as seen by IVIS imaging and FACS. The SDF‐1 level in the bone marrow failure mice was significantly higher than in the normal mice. Thus, from our study, it is clear that after CXCR4‐BMSCs were infused into mice with bone marrow failure, SDF‐1 interacted with CXCR4 receptor, leading cells to migrate and colonize to bone marrow. Because of the high SDF‐1 expression in mouse bone marrow and CXCR4 receptor expression in cells, BMSCs homing was increased.     

SDF-1／CXCR4与多发性骨髓瘤溶骨性病变的关系

多发性骨髓瘤（MM）患者的溶骨性破坏是主要的临床问题，其机制与骨髓瘤细胞或骨髓微环境的细胞产生破骨细胞激活因子刺激破骨细胞生成有关，SDF—1a是骨髓瘤骨病发病中的一个重要因子，也是治疗多发性骨髓瘤骨病潜在的靶目标。本文就SDF-1／CXCR4的结构，SDF-1／CXCR4在MM患者骨微环境中的表达及对破骨细胞的作用、血浆SDF-1和骨髓瘤细胞CXCR4的表达与MM溶骨病变及预后的关系、SDF-1／CXCR4是治疗骨髓瘤骨病的潜在靶标进行了综述。