基质细胞衍生因子-1和受体CXCR4在急性白血病和恶性淋巴瘤中的表达

目的分析急性白血病(AL)和恶性淋巴瘤(ML)患者外周血血清基质细胞衍生因子1(SDF1)及其骨髓单个核细胞(MNC)表面特异性受体CXCR4的表达,并进行对照研究。方法ELISA法检测血清中SDF1表达,流式细胞术检测骨髓MNC表面CXCR4的表达。结果26例AL患者包含9例急性淋巴细胞白血病和17例急性非淋巴细胞白血病,其SDF1、CXCR4表达分别为(7115.8±946.5)ng/L、(77.2±9.7)%和(4642.2±1146.8)ng/L、(38.9±11.0)%;18例ML患者包含5例霍奇金淋巴瘤和13例非霍奇金淋巴瘤,其SDF1、CXCR4表达分别为(3728.9±690.9)ng/L、(9.2±2.7)%和(4442.1±1073.0)ng/L、(8.5±2.4)%,上述各组SDF1/CXCR4表达均高于对照组水平(2369.3±966.5)ng/L、(2.7±1.5)%(P<0.01)。有髓外浸润的AL患者其SDF1/CXCR4的表达水平高于同组其他患者,有广泛浸润的ML患者其SDF1的表达水平高于同组其他患者。结论CXCR4/SDF1的高表达与AL和ML的发病及其浸润特性存在一定联系,为上述肿瘤的治疗提供了新思路。     

缺氧诱导因子-1α和血管内皮生长因子在结直肠癌组织中的表达及意义

目的　检测缺氧诱导因子 - 1(HIF- 1)和血管内皮生长因子 (VEGF)与结直肠癌临床病理及预后的关系。方法　用免疫组化 SP法检测 6 1例结直肠癌组织中 HIF- 1α及 VEGF蛋白的表达。结果　结直肠癌组织中HIF- 1α蛋白呈高表达 ,阳性率为 6 5 .6 % ,癌旁及正常组织不表达 ,HIF- 1α与结直肠癌的浸润深度及淋巴结转移密切相关 (P<0 .0 1) ,与 Dukes分期呈正相关 (P<0 .0 1) ;结直肠癌 VEGF阳性表达率为 4 9.2 % ,癌旁及正常黏膜几乎不表达 VEGF,癌间质血管内皮细胞不表达或弱表达 ,VEGF与结直肠癌的浸润深度及淋巴结转移相关(P<0 .0 5 ) ,与 Dukes分期呈正相关 (P<0 .0 2 ) ,且 VEGF阳性表达与 HIF- 1α阳性表达程度呈正相关 (P<0 .0 0 1)。结论　 HIF- 1α与 VEGF在结直肠癌浸润、转移过程中有协同作用 ,同时检测 HIF- 1α、VEGF蛋白的表达可作为判断结直肠癌浸润、转移和预后等生物学行为的重要参考指标     

大鼠肝卵圆细胞增殖过程中基质细胞衍生因子-1及其受体CXCR4的表达

近年来,有研究表明基质细胞衍生因子1(stromal cell-derived factor-1,SDF-1)和其受体CXCR4(SDF-1/CXCR4)轴在干细胞的增殖分化中起至关重要的作用[1].本研究采用2-乙酰氨基芴联合部分肝脏切除术(AAF/PH)成功诱导肝卵圆细胞增殖,同时给AAF/PH模型大鼠注射CXCR4特异性抑制剂AMD3100,通过检测SDF 1和其受体CXCR4在卵圆细胞增殖过程中表达的变化情况,进一步研究SDF-1/CXCR4轴在肝卵圆细胞增殖过程中的作用.     

Expression of vascular endothelial growth factor in human adrenals

Angiogenesis is an important component in many biological processes and also in pathologic conditions including neoplastic diseases. Vascular endothelial growth factor (VEGF) is a secreted endothelial cell-specific growth factor, which is induced by tissue hypoxia and is angiogenic in vivo. Adrenal gland is a well-vascularized organ, and the roles of VEGF in normal adrenal and in adrenal tumorigenesis is not well characterized. We therefore investigated VEGF mRNA expression in normal human adrenals and in cultured adrenocortical cells. VEGF mRNA was constantly expressed in normal adrenals as well as in cultured adrenocortical cells. The mRNA levels were increased after 24h stimulation with either ACTH or cAMP. The effect of cAMP was dose-dependent. This suggests that ACTH-induced VEGF mRNA expression is mediated via protein kinase A dependent pathway.     

胰腺癌及胰腺星状细胞中基质细胞衍生因子SDF-1及其受体CXCR4的表达

目的 检测基质细胞衍生因子(SDF-1)及其受体CXCR4在胰腺癌组织、细胞株及星状细胞(PSC)中的表达.方法 采用免疫组织化学方法 检测37例胰腺癌及10例癌旁正常胰腺组织SDF-1、CXCR4、α-SMA蛋白表达以及细胞株AsPC-1、PSC的SDF-1、CXCR4蛋白表达.RT-PCR检测AsPC-1、BxPC3、SW1990及PSC的SDF-1、CXCR4 mRNA表达.结果 37例胰腺癌CXCR4表达(+)8例、(++)20例、(+++)9例;10例癌旁正常胰腺组织CXCR4表达(-)2例、(+)7例、(++)1例,两者差异显著(P<0.01).胰腺癌的间质组织SDF-1的表达高于癌旁间质组织(P<0.01),并随α-SMA表达的增加而增加.胰腺癌细胞株AsPC-1有CXCR4蛋白表达,而PSC有SDF-1蛋白表达.AsPC-1、BxPC3、SW1990细胞株均有CXCR4 mRNA的表达,而无SDF-1 mRNA的表达;PSC有SDF-1 mRNA表达,CXCR4 mRNA微弱表达.结论 胰腺癌组织及细胞系表达CXCR4,PSC表达SDF-1,PSC有可能通过SDF-1/CXCR4轴促进胰腺癌的侵袭转移.     

Expression of vascular endothelial growth factor in patients with acute myocardial infarction

OBJECTIVE: The purpose of this study was to investigate the clinical significance of vascular endothelial growth factor (VEGF) in acute myocardial infarction (AMI). We also examined the involvement of peripheral blood mononuclear cells (PBMCs), which are a possible source of VEGF in AMI. BACKGROUND: VEGF is a potent endothelial cell-specific mitogen and could affect the outcome of AMI. METHODS: Thirty patients with AMI were used for this study. Serum and PBMCs were isolated from peripheral blood on days 1, 7, 14 and 21 after the onset of AMI. PBMCs were cultured at a density of 5 x 10(6) cells/ml for 24 h. VEGF levels in serum and the culture media were measured by enzyme-linked immunosorbent assay using a specific anti-human VEGF antibody. RESULTS: Serum VEGF levels elevated gradually after the onset of AMI and reached a peak on day 14. VEGF levels in the culture medium of PBMCs after incubation for 24 h (PBMC-VEGF) were maximally elevated 7 days after the onset. Maximum serum VEGF levels showed significant positive correlations with maximum creatine phosphokinase (CPK) levels (r = +0.70, p < 0.001), but maximum PBMC-VEGF levels did not correlate with maximum CPK levels. Patients showing improvement in left ventricular systolic function during the course of AMI showed significantly higher PBMC-VEGF levels than patients without improvement. CONCLUSIONS: The extent of myocardial damage contributes to the elevation of serum VEGF levels in AMI. VEGF produced by PBMCs may play an important role in the improvement of left ventricular function by promoting angiogenesis and reendothelialization after AMI.     

心房快速起搏致扩张型心肌病犬模型心肌基质细胞衍生因子-1及其受体的表达

目的观察心房快速起搏诱发扩张型心肌病犬模型心肌基质细胞衍生因子-1(SDF-1)及其受体CXCR4的表达。方法选用成年健康杂种犬13条,随机分为2组：快速起搏组7条,假手术组6条。均开胸于右心耳缝植AOO型起搏器,快速起搏组以400次/min起搏6周,假手术组不起搏。心脏彩超定期观察犬的心脏结构与功能。在实验结束时,应用逆转录-聚合酶链反应(RT-PCR)测定左心房和左心室心肌组织中SDF-1和CXCR4 mRNA表达水平。结果快速起搏组各犬不同程度出现心功能降低,与假手术组比较,该组左心房心肌组织中SDF-1和CXCR4 mRNA表达水平分别增加22．4%和18．8%,两组比较差异有统计学意义(t值分别为2．624、2．269,P＜0．05)；左心室心肌组织中SDF-1和CXCR4 mRNA表达水平与假手术组比较,差异无统计学意义(t值分别为0．133、0．525,P＞0．05)。结论心房快速起搏诱发扩张型心肌病犬模型中心房组织SDF-1和CXCR4 mRNA表达水平增高。     

Expression of vascular endothelial growth factor in human myocardial infarction

Summary To define mechanisms that may influence collateral circulation and angiogenesis, we investigated vascular endothelial growth factor (VEGF) mRNA expression in human hearts. In non-ischemic human hearts, VEGF mRNA was not detected in vessels, but was found in cardiomyocytes. In hearts with myocardial infarction, the intensity of the VEGF signal was much higher in smooth muscle cells of arterioles adjacent to necrosis and in infiltrating macrophages than in myocytes around the site of the necrosis. This study suggests that levels of VEGF expression are high in smooth muscle cells and macrophages around infarcted areas after myocardial infarction and that VEGF may play a role in promoting collateral circulation and angiogenesis in human ischemic hearts.     

Functional response of leukaemic blasts to stromal cell-derived factor-1 correlates with preferential expression of the chemokine receptor CXCR4 in acute myelomonocytic and lymphoblastic leukaemia

The chemokine stromal cell-derived factor-1 (SDF-1) that is released by bone marrow (BM) stromal cells and contributes to stem cell homing may also play a role in the trafficking of leukaemic cells. We analysed SDF-1-induced intracellular calcium fluxes in leukaemic blasts from the peripheral blood of patients with newly diagnosed acute myeloid leukaemia (AML) and lymphoblastic leukaemia (B-lineage ALL), determined the effect of BM stromal cell-conditioned medium on in vitro transendothelial migration (TM) and measured expression of the SDF-1 receptor, CXCR4, by flow cytometry. AML FAB M1/2 blasts did not show calcium fluxes and TM was not stimulated. In myelomonocytic AML (M4/5), however, SDF-1 induced significant calcium fluxes and TM was increased twofold by the conditioned medium. M3 and M4 blasts with eosinophilia (M4eo) showed intermediate activity and M6 blasts showed no functional activity. In ALL, strong calcium fluxes and increased TM (2.5-fold) were observed. Accordingly, expression of CXCR4 was low in undifferentiated (M0) AML, myeloid (M1/2) AML and erythroid (M6) AML, but high [mean fluorescence (MF) > 50] in promyelocytic (M3) AML, myelomonocytic (M4/5) AML and B-lineage ALL. We conclude that, in AML, SDF-1 is preferentially active in myelomonocytic blasts as a result of differentiation-related expression of CXCR4. Functional activity of SDF-1 and high expression of CXCR4 in B-lineage ALL is in accordance with the previously described activity of SDF-1 in early B cells. SDF-1 may contribute to leukaemic marrow infiltration, as suggested by increased CXCR4 expression and migratory response in BM-derived blasts compared with circulating cells.     

血管内皮生长因子及其受体在肺气肿患者肺组织中的表达

目的探讨血管内皮生长因子(VEGF)及其受体2(VEGF受体2/KDR)在肺气肿患者肺组织中的表达及其与肺气肿的相关性。方法取35例行肺叶切除术患者[A组(吸烟伴肺气肿组)16例,B组(不吸烟肺功能正常组)14例,C组(吸烟但肺功能正常组)5例]的外周肺组织标本,ELISA法检测肺组织匀浆中VEGF的含量,免疫组化法检测KDR蛋白表达,RT PCR检测VEGF和KDRmRNA水平,TUNEL法检测肺泡隔细胞的凋亡。结果A组患者肺组织VEGF、KDR表达均低于B组(P<0.01),肺泡隔细胞凋亡率高于B组(P<0.01)。C组与B组相比,VEGF及KDR表达差异无统计学意义(P>0.05)。结论VEGF及KDR水平减少与肺泡隔细胞凋亡的增加可能与肺气肿的发生相关。     

心肌梗死后基质细胞衍生因子-1的表达及其意义

目的 探讨大鼠心肌梗死(MI)后不同时间,梗死组织基质细胞衍生因子-1(SDF-1)的表达以及与骨髓间充质干细胞（MSC）迁移的关系,为细胞移植提供可靠依据。方法 在MI后不同时间,用PCR测定梗死组织中SDF-1表达的水平。提取梗死心肌组织提取液,在Costar Transwell 双层细胞培养皿观察MI后不同时间梗死心肌组织对MSC迁移能力的影响。结果 SDF-1在组织脏器内的表达存在差异,MI梗死心肌组织中SDF-1的表达呈现出时间变化的趋势,梗死后48 h 达到高峰水平。梗死后的心肌组织对MSC迁移的影响与SDF-1的表达呈相同的变化程序,梗死后48 h 对MSC的趋化作用最强。经SDF-1的受体CXCR4特异性阻滞剂处理后,MSC向梗死组织提取液迁移的能力受到明显抑制。结论 MI后的早期,局部组织中SDF-1的表达明显升高,并可在MI后2周内维持在一个相对高的水平,其对于移植细胞向梗死区域迁移具有重要的作用。     

Intramuscular vascular endothelial growth factor gene therapy in patients with chronic critical leg ischemia

We sought to investigate the safety and efficacy of intramuscular gene therapy with vascular endothelial growth factor (VEGF) in patients with chronic critical leg ischemia.Gene transfer was performed in 24 limbs of 21 patients with rest pain, some of whom also had nonhealing ischemic ulcers (n = 16) due to occlusive peripheral arterial disease. Between 400 microg and 2000 microg of phVEGF(165) (400 microg, n = 2; 800 microg, n = 4; 1200 microg, n = 4; 1600 microg, n = 6; and 2000 microg, n = 8) was injected directly into the muscles of the ischemic limb; the same dose was injected 4 weeks later. The ratio of blood pressures at the ankle and brachial artery was measured before and after treatment.Mean (+/- SD) plasma levels of VEGF increased significantly from 26 +/- 31 pg/mL to 63 +/- 56 pg/mL (P <0.005), and the ankle-brachial index improved significantly from 0.58 +/- 0.24 to 0.72 +/- 0.28 (P <0.001). Magnetic resonance angiography showed qualitative evidence of improved distal flow in 19 limbs (79%). Ischemic ulcers healed or improved markedly in 12 limbs (75%). Rest pain was relieved or improved markedly in 20 limbs (83%). Amputation was performed in two limbs because of wound infection. Complications were limited to transient leg edema in six limbs.Intramuscular gene therapy with VEGF(165) for patients with chronic critical leg ischemia is safe, feasible, and effective.     

血管内皮细胞生长因子在急性肺损伤大鼠中的表达及意义

目的探讨血管内皮细胞生长因子(VEGF)在脂多糖所致急性肺损伤大鼠中的表达及意义,为临床防治急性肺损伤提供参考依据。方法将40只SD大鼠随机分为LPS(脂多糖)组和NS(生理盐水)组,麻醉后气管插管,LPS组吸入LPS(3 mg/kg),NS组吸入等量NS。0h、2h、4h、6h时每组分别处死5只大鼠,抽血行血气分析,同时进行血浆VEGF水平、肺泡灌洗液(BALF)蛋白定量和VEGF水平、肺组织病理学、免疫组化以及VEGF mRNA表达水平检测。结果 LPS组2h、4h、6h时间点p H和Pa O2均明显低于NS组相应时间点,Pa CO2和肺损伤评分均明显高于NS组相应时间点(P0.05)。LPS组2h、4h、6h时间点BALF蛋白定量均明显高于NS组相应时间点(P0.05),LPS组2h、4h、6h时间点BALF和血浆VEGF定量均明显高于NS组相应时间点(P0.05)。LPS组BALF和血浆中VEGF水平与肺损伤评分均呈正相关(r=0.682和r=0.613,P0.001),BALF中VEGF水平与蛋白定量呈正相关(r=0.715,P0.001)。LPS组2h、4h、6h时间点肺组织中VEGF mRNA的表达均明显高于NS组相应时间点表达(P0.05)。结论 ALI大鼠血浆、BALF和肺组织中VEGF水平明显升高,血浆和BALF中VEGF水平与肺损伤程度呈正相关,BALF中VEGF水平与蛋白定量呈正相关,提示VEGF可能通过增加呼吸膜的通透性参与急性肺损伤发生过程。     

Loss of myeloid cell-derived vascular endothelial growth factor accelerates fibrosis

Tissue injury initiates a complex series of events that act to restore structure and physiological homeostasis. Infiltration of inflammatory cells and vascular remodeling are both keystones of this process. However, the role of inflammation and angiogenesis in general and, more specifically, the significance of inflammatory cell-derived VEGF in this context are unclear. To determine the role of inflammatory cell-derived VEGF in a clinically relevant and chronically inflamed injury, pulmonary fibrosis, we deleted the VEGF-A gene in myeloid cells. In a model of pulmonary fibrosis in mice, deletion of VEGF in myeloid cells resulted in significantly reduced formation of blood vessels; however, it causes aggravated fibrotic tissue damage. This was accompanied by a pronounced decrease in epithelial cell survival and a striking increase in myofibroblast invasion. The drastic increase in fibrosis following loss of myeloid VEGF in the damaged lungs was also marked by increased levels of hypoxia-inducible factor (HIF) expression and Wnt/β-catenin signaling. This demonstrates that the process of angiogenesis, driven by myeloid cell-derived VEGF, is essential for the prevention of fibrotic damage.     

缺氧诱导因子-1α、血管内皮生长因子和生存素在非小细胞肺癌中的表达及相关性研究

目的:探讨缺氧诱导因子-1α(HIF-1α)、血管内皮生长因子(VEGF)和生存素(survivin)在非小细胞肺癌中的表达及相关性。方法:收集我院收治的病理确诊为非小细胞肺癌患者20例,并分别取其癌组织与癌旁组织。采用免疫组织化学染色法检测癌组织与癌旁组织中HIF-1α、VEGF和生存素的表达。结果:HIF-1α、VEGF和生存素在非小细胞肺癌癌组织中的表达均高于其癌旁组织(P0.05);在癌组织中,HIF-1α与VEGF和生存素表达呈正相关,Spearman相关系数分别为0.519、0.643;而VEGF与生存素表达亦呈正相关,Spearman相关系数为0.643(P0.05)。结论:在非小细胞肺癌癌组织中HIF-1α、VEGF和生存素表达明显高于癌旁组织;HIF-1α可以调节VEFG和生存素的表达,且VEGF和生存素在肿瘤发生、发展过程中可能有一定的协同作用。