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Annexin Ⅱ在多发性骨髓瘤及其他血液肿瘤中的表达及机制研究
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摘要
Annexins蛋白是一类受Ca2+调节、能够与带负电荷的膜磷脂结合的蛋白家族,在许多原核和真核细胞中广泛表达。AnnexinⅡ(AnxA2,A2)作为Annexin家族的重要成员,于1979年被Rade和Martin首先发现。AnxA2多表达于内皮细胞、单核巨噬细胞、神经细胞和某些肿瘤细胞,在细胞膜、细胞质、细胞核和胞外均有表达。AnxA2蛋白在细胞内以单体和异四聚体两种形式存在。AnxA2单体由保守的C端和可变的N端组成,可与蛋白质配体P11蛋白(又名S100A10)形成异四聚体,执行其与生物膜结构相关的一系列功能。
     AnxA2蛋白参与了众多生物学活动,在细胞膜构架的形成,膜聚合、内吞和胞吐,纤溶系统的稳定等生理活动中均扮演重要角色。AnxA2还参与某些病理过程,与心血管疾病、血液病、感染、肿瘤等多种疾病相关。无论在胞内还是胞外, AnxA2都具有广泛的功能,对其的研究也受到越来越多的关注。
     一、AnxA2单抗的制备及功能研究
     研究表明AnxA2的胞外区是t-PA和plasminagen的共受体,在纤溶活性的诱导过程中起重要作用,并是多种病毒、炎症介质的受体,在病毒感染,炎症活动中起一定作用,因此,制备针对AnxA2的胞外区的单克隆抗体对研究AnxA2在各种生理病理状态下的功能具有重要意义。
     利用本科室已经建立起来的杂交瘤技术,将重组AnxA2蛋白经次氮基三乙酸镍琼脂糖(Ni-NTAagarose)柱纯化浓缩后免疫Balb/c小鼠,尾静脉加强后取脾细胞融合,ELISA法筛选阳性克隆,制备腹水。运用Western blot对抗体进行鉴定观察抗体与原核重组蛋白反应情况。结果可以看出:小鼠脾细胞与杂交瘤细胞融合后筛选获得两株持续分泌单克隆抗体的细胞株,命名为SZ-135,SZ-136。该株杂交瘤细胞单克隆后接种小鼠腹腔产生腹水,腹水经蛋白G-Sephrose4B亲和层析柱纯化。SZ-135,SZ-136单抗能特异性识别相对分子量为36kD的重组蛋白。同时SZ-135可以有效抑制HMEC-1体外的血管形成。
     二、AnxA2在多发性骨髓瘤及各类血液病中的异常表达及机制研究
     1. AnxA2在多发性骨髓瘤及各类血液病中的异常表达
     AnxA2表达异常与人类许多疾病的发生发展相关,在多种类型的肿瘤中都可观察到AnxA2的表达异常。国外近年的研究表明,AnxA2在APL细胞膜表面的高表达与其原发性纤溶亢进有关,但在MM及其它类型的血液病中的表达却少有报道。
     在我们的实验中,通过应用流式细胞仪检测了6例骨髓瘤病人和6例正常人浆细胞表面AnxA2表达,明确了骨髓瘤病人浆细胞表面AnxA2表达明显高于正常人。通过real-time PCR、Western blot、流式细胞仪检测U266和NB4、RPMI8226、XG7、Jurkat、Raji、U937、K562共8类血液病细胞株AnxA2表达,明确了骨髓瘤细胞株U266在mRNA、总蛋白、膜表面蛋白不同水平均较其它血液病细胞株高表达AnxA2。骨髓瘤细胞株RPMI8226在总蛋白水平亦高表达AnxA2。
     2. AnxA2基因对骨髓瘤U266、RPMI8226细胞增殖、凋亡、侵袭力及细胞因子的影响
     为了了解AnxA2基因对骨髓瘤U266、RPMI8226细胞增殖、凋亡、侵袭力及细胞因子的影响,我们应用RNAi技术进行研究。首先,采用siRNA转染人骨髓瘤U266、RPMI8226细胞,应用real-time PCR、Western blot和流式细胞术鉴定干扰效果。继而应用MTT法检测siRNA对细胞增殖的作用,应用Annexin V-FITC/PI双染流式细胞术检测其对细胞凋亡的影响,应用Transwell板检测细胞侵袭力,应用real-time PCR检测对血管新生、凋亡、侵袭等相关基因的影响。结果表明,AnxA2siRNA转染U266和RPMI8226细胞均对细胞增殖起抑制作用(P<0.05),并可诱导细胞凋亡增加(P<0.05),明显降低细胞侵袭力(P<0.05),同时降低血管新生相关因子VEGF-C、VEGF-R2,侵袭相关因子MMP-2、MMP-9、MT1-MMP和TIMP-2的表达。由此我们认为:siRNA沉默AnxA2基因可抑制U266和RPMI8226细胞增殖、侵袭,诱导凋亡增加,降低血管新生、侵袭相关因子的表达。
     三、各类药物对血液病细胞株AnxA2表达的影响
     1.AnxA2与沙利度胺、地塞米松诱导骨髓瘤病人血栓形成的相关性为了了解沙利度胺(thalidomide)、地塞米松(Dexamethasone,DXM)在体外对人多发性骨髓瘤(Multiple myeloma MM)细胞株RPMI8226、人微血管内皮细胞株HMEC-1、人静脉内皮细胞株EAHY926中AnxA2基因表达的调节作用,探讨AnxA2基因与沙利度胺、地塞米松诱发骨髓瘤病人血栓形成的相关性。我们在体外培养上述细胞,real time PCR检测在不同浓度下沙利度胺及地塞米松对三种细胞株AnxA2基因表达的影响,流式细胞仪、激光共聚焦检测对三种细胞株膜表面AnxA2蛋白表达的影响,细胞促纤溶活性实验检测对三种细胞株膜表面纤溶酶活性的影响。结果表明,12.5μg/ml、25μg/ml、50μg/ml沙利度胺,2.5μg/ml地塞米松,25μg/ml沙利度胺加2.5μg/ml地塞米松均能诱导RPMI8226、HMEC-1、Eahy926细胞株AnxA2mRNA和蛋白表达下降(P<0.05)。AnxA2抗体、12.5μg/ml、25μg/ml、50μg/ml沙利度胺,2.5μg/ml地塞米松,25μg/ml沙利度胺加2.5μg/ml地塞米松均能诱导RPMI8226、HMEC-1、Eahy926细胞株纤溶活性下降(P<0.05),差异有统计学意义。故我们认为,沙利度胺和地塞米松能抑制RPMI8226、HMEC-1、Eahy926细胞株AnxA2mRNA和蛋白表达。由于AnxA2为t-PA和PLA的共受体,具促纤溶作用,沙利度胺和地塞米松通过下调AnxA2,抗纤溶,可能为其诱发MM血栓形成的原因之一。
     2.AS2O3通过下调AnxA2抑制NB4细胞侵袭力
     为了研究三氧化二砷(Arsenic trioxide ,AS2O3)是否可通过下调AnxA2抑制人急性早幼粒白血病细胞(NB4)侵袭力的作用。我们在体外培养NB4细胞,并通过流式细胞仪检测不同浓度AS2O3对NB4细胞膜表面AnxA2蛋白表达的影响,Transwell板检测AnxA2抗体和AS2O3对NB4细胞侵袭力的影响。结果表明AS2O3在0.31μg/ml,0.63μg/ml,1.25μg/ml浓度均能诱导NB4细胞膜表面AnxA2蛋白水平表达下降(P<0.05),存在剂量依赖性;AnxA2抗体在0.01μg/ml,0.02μg/ml,0.04μg/ml浓度和AS2O3在0.31μg/ml,0.63μg/ml,1.25μg/ml浓度均抑制NB4细胞侵袭力下降(P<0.05),并有量效关系。因此我们认为AnxA2抗体可抑制NB4细胞侵袭力,AS2O3可通过下调AnxA2蛋白膜表面表达,抑制NB4细胞侵袭力。
Studies on the expression and function of annexinⅡin multiple myeloma and other neoplastic hematologic disorders
     Annexins are Ca2+ and phospholipid binding proteins forming an evolutionary conserved multigene family with members of the family being expressed throughout animal and plant kingdoms. AnnexinⅡ(AnxA2) belongs to the family of annexins, which was discovered by Rade and Martin in 1979. It distributes in endothelial cells, mononuclear macrophages, nerve cells and some tumor cells. It exists as either a membrane-associated, cytosolic or soluble form in serum. AnxA2 presences inside cells in the two forms of monomer and tetramer. The monomer molecular structures include the conserved core and a second principal domain, which NH2-terminally precedes the core, is unique for a given member of the family and most likely specifies individual annexin properties in vivo. The monomer can form the tetramer with the protein of P11(S100A10), and carry out a series of function.
     AnxA2 can act as a membrane scaffold protein, and is involved in membrane organization, membrane fusion, endocytosis and exocytosis. It also partakes in some pathological processes and is associated with cardiovascular diseases, leukemia, infection and cancer, etc. Wherever inside or outside cells, AnxA2 has extensive function.The research about it has got more and more attention.
     Preparation and function study of monoclonal antibody against AnxA2 By using our established method, the recombined protein was purified by Ni-NTA agarose column and Balb/c mice were immunized. After the spleen cells of the mice and SP2/0 hybridoma cells were hybridized, positive clones was screened by ELISA assay and the selected hybridoma cells were used to prepare ascites. Western blot was used to detect whether the prepared anti-AnxA2 antibody can bind AnxA2 protein. The results show that: After the spleen cells and hybridoma cells SP2/0 were hybridized, we got two strain of cell that can last secreting anti-AnxA2 antibody named SZ-135, SZ136. The selected hybridoma cells was used to prepare ascites, the titers of anti-AnxA2 antibody in ascites was detected by indirect ELISA. The concentrations of purified anti-AnxA2 antibody were purified by proteinG-Sephrose4B affinity chromatography column. The antibodies could identify 36kD recombinated protein of AnxA2 and the antibody of SZ-135 can inhibite HMEC-1 angiogenesis in vitro effectively.
     The expression and significient of AnxA2 in multiple myeloma
     The abnormal expression of AnxA2(A2) has been associated with the development of many tumors, however, it’s expression and function in multiple myeloma(MM) patients and cell lines is less known. We compared the expression of AnxA2 in myeloma cells from MM patients with that in plasma cells from normal person and found that myeloma cells from patients had high expression of AnxA2.At the same time,we compared the expression of AnxA2 in MM cell lines U266 and RPMI8226 with other hematologic tumor cell lines and found that the myeloma cell lines U266 and RPMI8226 had also high expression of AnxA2. By transfecting U266 and RPMI8226 cells with the small interfering RNA(siRNA) that targets human AnxA2, AnxA2 expression was significantly downregulated. This resulted in the decreased proliferation, invasive potential, and increased apoptosis of U266 and RPMI8226 cell lines. Silencing AnxA2 gene by siRNA can also inhibit the expression of pro-angiogenic molecules including VEGF-C, VEGF-R2, MMP-2, MMP-9, MT1-MMP and TIMP-2 in the two cell lines. Our data suggested that the AnxA2 has high expression in MM patients and myeloma cell lines U266 and RPMI8226. The AnxA2 played a critical role in the proliferation, apoptosis and invasive potential of MM cell lines U266 and RPMI8226.
     The Relationship of AnxA2 and The Thrombosis Induced by Thalidomide and Dexamethasone in Multiple Myeloma
     My major is to investigate the effect of thalidomide and Dexamethasone(DXM) on gene of AnxA2(A2) of RPMI8226,HMEC-1 and EAhy926 cell lines in vitro, and compare the change of AnxA2 with thrombosis induced by thalidomide and DXM in multiple myeloma. We cultivated RPMI8226, HMEC-1 and EAhy926 cell lines in vitro. Real time quantitative PCR (RQ-PCR) was used to detect the influence of thalidomide and DXM on the expression of mRNA of AnxA2, Flow Cytometry(FCM) and Confocal microscope were used to detect the protein expression on the cells surface after the samples were stimulated with thalidomide and DXM. Substrate chromatography was used to measure the plasminogen activation. The results showed that the mRNA and protein level of AnxA2 in RPMI8226, HMEC-1 and EAhy926 cells line treated by thalidomide in the different concentration of 12.5μg/ml, 25μg/ml, 50μg/ml and DXM was decreased compared with the unblocked (P<0.05). The plasminogen activation can also be decreased by AnxA2 antibody,thalidomide and DXM. Our conclusions was that thalidomide and DXM can inhibite the expression of AnxA2 in RPMI8226, HMEC-1 and EAhy926 cell line,then inhibite the plasminogen activation.It’s possibly one of the reason of thrombosis production induced by thalidomide and DXM in multiple myeloma.
     Arsenic trioxide inhibits invasive potential of NB4 cells through down regulation of AnxA2
     My objective is to investigate the effect of arsenic trioxide (As2O3) on inhibiting invasive potential of NB4 through down regulation of AnxA2(A2). We cultured NB4 cells in vitro. Flow Cytometry (FCM) was used to detect the protein level on the cells surface after the samples were incubated with As2O3 in different concentrations.The influence of anti-AnxA2 antibody and As2O3 on the invasive potential of NB4 cells was investigated by using transwell plates. The results showed that the protein level of AnxA2 in NB4 cells treated by As2O3 in the different concentrations of 0.31, 0.63, and 1.25μg/ml was decreased compared with the unblocked (P<0.05). the invasive potential of NB4 cells treated with anti-AnxA2 antibody in the different concentrations of 0.01, 0.02, and 0.04μg/ml as well as As2O3 in the different concentrations of 0.31, 0.63, and 1.25μg/ml was decreased compared with the blank (P<0.05). Our data suggested that the down regulation of AnxA2 can inhibit invasive potential of NB4, As2O3 can inhibit invasive potential of NB4 cells through down regulation of AnxA2.
引文
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    [1] Claudio JO, Masih-Khan E, Tang HC, et al. A molecular compendium of genes expressed in multiple myeloma. Blood, 2002;100:2175-2186.
    [2] Munshi NC, Hideshima T, Carrasco D, et al. Identification of genes modulated in multiple myeloma using genetically identical twin samples. Blood, 2004;103: 1799-1806.
    [3] Zhan FH, Tian E, Bumm K, et al. Gene expression profiling of human plasma cell differentiation and classification of multiple myeloma based on similarities to distinct stages of late-stage B-cell development. Blood, 2003;101:1128-1140.
    [4] Verdelli D, Mattioli M, Fabris S, et al. Molecular and biological characterization ofthree novel interleukin-6-dependent human myeloma cell lines. Haematologica, 2005; 90:1541-1548.
    [5] Fonseca R and Stewart AK. Targeted therapeutics for multiple myeloma: The arrival of a risk-stratified approach. Mol Cancer Ther, 2007;6:802-810.
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    [14] Mickleburgh I, Burtle B, Hollas H, et al. AnxA2 binds to the localization signal in the 3’untranslated region of c-myc mRNA. FEBS, 2005;23:413-421.
    [15] Sylvette Chasserot-Golaz S, Vitale N, Umbrecht-Jenck E, et al. AnxA2 Promotes the Formation of Lipid Microdomains Required for Calcium- regulated Exocytosis of Dense-CoreVesicles. Molecular Biology of the Cell, 2005;71:1108-1119.
    [16] Zibouche M, Vincent M, Illien F, et al. The N-terminal Domain of AnxA2 Serves as a Secondary Binding Site during Membrane Bridging. J Biol Chem, 2008;283:22121-22127.
    [17] Rescher U and Gerke V. Annexins–unique membrane binding proteins with diverse functions J. Cell Sci, 2004;117:2631-2639.
    [18] Graauw M, Tijdens I, Smeets MB, et al. AnxA2 Phosphorylation Mediates Cell Scattering and Branching Morphogenesis via Cofilin Activation. Mol Cell Biol, 2008;28:1029-1040.
    [19] Filipenko NR, MacLeod TJ, Chang-Soon Y, et al. AnxA2 Is a Novel RNA-binding Protein.J. Biol Chem, 2004;279:8723-8731.
    [20] Laumonnier Y, Syrovets T, Burysek L, et al. Identification of the AnxA2 heterotetramer as a receptor for the plasmin-induced signaling in human peripheral monocytes. Blood, 2006;107:3342-3349.
    [21] MacLeod TJ, Kwon M, Filipenko NR, et al. Phospholipid-associated AnxA2-S100A10 Heterotetramer and Its Subunits: Characterization of the interaction with tissue plasminogen activator,plasminogen,and plasmin. J Biol Chem, 2003;278:25577-25584.
    [22] Semov A, Moreno MJ, Onichtchenko A, et al. Metastasis-associated Protein S100A4 Induces Angiogenesis through Interaction with Annexin II and Accelerated Plasmin Formation. J Biol Chem, 2005;280:20833-20841.
    [23] Rescher U, Ludwig C, Konietzko V, et al. Tyrosine phosphorylation of AnxA2 regulates Rho-mediated actin rearrangement and cell adhesion. J Cell Sci, 2008;121:2177-2185.
    [24] Ma G, Greenwell-Wild T, Lei KJ, et al. Secretory Leukocyte Protease Inhibitor Binds to Annexin II, a Cofactor for Macrophage HIV-1 Infection. The Journal of Experimental Medicine, 2004;26:1337-1346.
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    [3] Zhan FH, Tian E, Bumm K, et al. Gene expression profiling of human plasma cell differentiation and classification of multiple myeloma based on similarities to distinct stages of late-stage B-cell development. Blood, 2003;101:1128-1140.
    [4] Verdelli D, Mattioli M, Fabris S, et al. Molecular and biological characterization of three novel interleukin-6-dependent human myeloma cell lines. Haematologica, 2005;90:1541-1548.
    [5] Munshi NC, Hideshima T, Carrasco D, et al. Identification of genes modulated in multiple myeloma using genetically identical twin samples. Blood, 2004;103: 1799-1806.
    [6] Hastie C, Masters JR, Moss SE, et al. IFNγreduces cell surface expression of AnxA2 and suppresses the invasive capacity of prostate cancer cells. The Journal of Biological Chemistry, 2008;283:12595-12603.
    [7] Laumonnier Y, Syrovets T, Burysek L, et al. Identification of the annexinA2 heterotetramer as a receptor for the plasmin- induced signaling in human peripheral monocytes. Blood, 2006;107:3342-3349.
    [8] Brownstein C, Deora AB, Jacovina AT, et al. Annexin II mediates plasminogen- dependent matrix invasion by human monocytes: enhanced expression by macrophages. Blood, 2004;103:317-324.
    [9] Semov A, Moreno MJ, Onichtchenko A, et al. etastasis-associated Protein S100A4 Induces Angiogenesis through Interaction with Annexin II and Accelerated Plasmin Formation. The Journalof Biological Chemistry, 2005;20833-20841.
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    [13] Palumbo A, Facon T, Sonneveld P, et al. halidomide for treatme nt of multiple myeloma: 10 years later. Blood, 2008;111:3968-3977.
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    [16] Mickleburgh I, Burtle B, Hollas H, et al. AnxA2 binds to the localization signal in the 3’untranslated region of c-myc mRNA. FEBS Journal, 2005; 272:413-421.
    [17] Chasserot-Golaz S, Vitale N, Umbrecht-Jenck E, et al. AnxA2 Promotes the Formation of Lipid Microdomains Required for Calcium-regulated Exocytosis of Dense-CoreVesicles. Molecular Biology of the Cell, 2005;16:1108-1119.
    [18] Ma G, Greenwell-Wild T, Lei K, et al. Secretory Leukocyte Protease Inhibitor Binds to Annexin II, a Cofactor for Macrophage HIV-1 Infection. The Journal of Experimental Medicine, 2004;200:1337-1346.
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    [21] Katzel JA, Hari P, Vesole DH. Multiple Myeloma: Charging Toward a Bright Future. CA Cancer J Clin, 2007;57:301-318.
    [22] Fonseca R and Stewart AK. Targeted therapeutics for multiple myeloma: The arrival of a risk-stratified approach. Mol Cancer Ther, 2007;6:802-810.
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    [1] Menell JS, Cesarman GM, Jacovina AT, et al. Annexin II and Bleeding in Acute Promyelocytic Leukemia. N Engl J Med, 1999;340:994-1004.
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    [8] Mickleburgh I, Burtle B, Hollas H, et al. AnxA2 Binds to The Localization Signal in The 3’untranslated Region of C-myc mRNA. FEBS J, 2005;272:413-421.
    [9] Ma G, Greenwell-Wild T, Lei K, et al. Secretory Leukocyte Protease Inhibitor Binds to Annexin II, a Cofactor for Macrophage HIV-1 Infection. J Exp Med, 2004;200: 1337-1346.
    [10] Brownstein C, Deora AB, Jacovina AT, et al. Annexin II Mediates Plasminogen- dependent Matrix Invasion by Human Monocytes: Enhanced Expression by Macrophages. Blood, 2004;103: 317-324.

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