Name: a simple bioassay for the evaluation of vascular endothelial growth factors
Uploaded: 2016-03-15T14:00:00
Description: Watch this Scientific Journal Video about A Simple Bioassay for the Evaluation of Vascular Endothelial Growth Factors at JoVE.com

SAS and MGA are supported by Project Grants, a Program Grant and Research Fellowships from the National Health and Medical Research Council of Australia (NHMRC), and by funds from the Operational Infrastructure Support Program provided by the Victorian Government, Australia. MMH has support from a Peter MacCallum Foundation Grant.

IL-3和制备的源WEHI-3D​​的空调中等注意：小鼠粒细胞白血病细胞系WEHI-3D​​是培养以产生含IL-3条件培养基。 <ol><li>培养WEHI-3D​​中的Dulbecco改进的Eagle培养基（DMEM），10％胎牛血清（FBS），1％的长寿命补充谷氨酰胺，50μg/ ml的庆大霉素。接种5×10 6个细胞中生长的对数相到50ml在一个T175 cm 3的组织培养瓶的新鲜培养基并生长约7天，或者直到细胞已经由约24?...

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	<li>Ferrara, N., Gerber, H. P., LeCouter, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+biology+of+VEGF+and+its+receptors.">The biology of VEGF and its receptors.</a> Nat Med. 9, 669-676 (2003).</li><li>Achen, M. G., Stacker, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vascular+endothelial+growth+factor-D:signalling+mechanisms,+biology+and+clinical+relevance.">Vascular endothelial growth factor-D:signalling mechanisms, biology and clinical relevance.</a> Growth Factors. 5, 283-296 (2012).</li><li>Ferrara, N., Mass, R. D., Campa, C., Kim, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeting+VEGF-A+to+treat+cancer+and+age-related+macular+degeneration.">Targeting VEGF-A to treat cancer and age-related macular degeneration.</a> Annu Rev Med. 58, 491-504 (2007).</li><li>Ferrara, N., Hillan, K. J., Gerber, H. P., Novotny, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Discovery+and+development+of+bevacizumab,+an+anti-VEGF+antibody+for+treating+cancer.">Discovery and development of bevacizumab, an anti-VEGF antibody for treating cancer.</a> Nat Rev Drug Discov. 3, 391-400 (2004).</li><li>Korpelainen, E. I., Alitalo, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Signaling+angiogenesis+and+lymphangiogenesis.">Signaling angiogenesis and lymphangiogenesis.</a> Curr Opin Cell Biol. 10, 159-164 (1998).</li><li>Senger, D. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tumour+cells+secrete+a+vascular+permeability+factor+that+promotes+accumulation+of+ascities+fluid.">Tumour cells secrete a vascular permeability factor that promotes accumulation of ascities fluid.</a> Science. 219, 983-985 (1983).</li><li>Joukov, V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel+vascular+endothelial+growth+factor,+VEGF-C,+is+a+ligand+for+the+Flt-4+(VEGFR-3)+and+KDR+(VEGFR-2)+receptor+tyrosine+kinases.">A novel vascular endothelial growth factor, VEGF-C, is a ligand for the Flt-4 (VEGFR-3) and KDR (VEGFR-2) receptor tyrosine kinases.</a> EMBO J. 15, 290-298 (1996).</li><li>Achen, M. G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vascular+endothelial+growth+factor+D+(VEGF-D)+is+a+ligand+for+the+tyrosine+kinases+VEGF+receptor+2+(Flk1)+and+VEGF+receptor+3+(Flt4).">Vascular endothelial growth factor D (VEGF-D) is a ligand for the tyrosine kinases VEGF receptor 2 (Flk1) and VEGF receptor 3 (Flt4).</a> Proc Natl Acad Sci USA. 95, 548-553 (1998).</li><li>Leppanen, V. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structural+determinants+of+vascular+endothelial+growth+factor-D+receptor+binding+and+specificity.">Structural determinants of vascular endothelial growth factor-D receptor binding and specificity.</a> Blood. 117, 1507-1515 (2011).</li><li>Wise, L. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vascular+endothelial+growth+factor+(VEGF)-like+protein+from+orf+virus+NZ2+binds+to+VEGFR2+and+neuropilin-1.">Vascular endothelial growth factor (VEGF)-like protein from orf virus NZ2 binds to VEGFR2 and neuropilin-1.</a> Proc Natl Acad Sci USA. 96, 3071-3076 (1999).</li><li>Yamazaki, Y., Takani, K., Atoda, H., Morita, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Snake+venom+vascular+endothelial+growth+factors+(VEGFs)+exhibit+potent+activity+through+their+specific+recognition+of+KDR+(VEGF+receptor+2).">Snake venom vascular endothelial growth factors (VEGFs) exhibit potent activity through their specific recognition of KDR (VEGF receptor 2).</a> J Biol Chem. 278, 51985-51988 (2003).</li><li>Stacker, S. A., Achen, M. G., Jussila, L., Baldwin, M. E., Alitalo, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lymphangiogenesis+and+cancer+metastasis.">Lymphangiogenesis and cancer metastasis.</a> Nat Rev Cancer. 2, 573-583 (2002).</li><li>Stacker, S. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=VEGF-D+promotes+the+metastatic+spread+of+tumor+cells+via+the+lymphatics.">VEGF-D promotes the metastatic spread of tumor cells via the lymphatics.</a> Nat Med. 7, 186-191 (2001).</li><li>Skobe, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Induction+of+tumor+lymphangiogenesis+by+VEGF-C+promotes+breast+cancer+metastasis.">Induction of tumor lymphangiogenesis by VEGF-C promotes breast cancer metastasis.</a> Nat Med. 7, 192-198 (2001).</li><li>Mandriota, S. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vascular+endothelial+growth+factor-C-mediated+lymphangiogenesis+promotes+tumour+metastasis.">Vascular endothelial growth factor-C-mediated lymphangiogenesis promotes tumour metastasis.</a> EMBO J. 20, 672-682 (2001).</li><li>Stacker, S. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lymphangiogenesis+and+lymphatic+vessel+remodelling+in+cancer.">Lymphangiogenesis and lymphatic vessel remodelling in cancer.</a> Nat Rev Cancer. 14, 159-172 (2014).</li><li>Karnezis, T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=VEGF-D+promotes+tumor+metastasis+by+regulating+prostaglandins+produced+by+the+collecting+lymphatic+endothelium.">VEGF-D promotes tumor metastasis by regulating prostaglandins produced by the collecting lymphatic endothelium.</a> Cancer Cell. 21, 181-195 (2012).</li><li>Folkman, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Angiogenesis:+an+organizing+principle+for+drug+discovery.">Angiogenesis: an organizing principle for drug discovery.</a> Nat Rev Drug Discov. 6, 273-286 (2007).</li><li>Stacker, S. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Biosynthesis+of+vascular+endothelial+growth+factor-D+involves+proteolytic+processing+which+generates+non-covalent+homodimers.">Biosynthesis of vascular endothelial growth factor-D involves proteolytic processing which generates non-covalent homodimers.</a> J Biol Chem. 274, 32127-32136 (1999).</li><li>McColl, B. K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Plasmin+activates+the+lymphangiogenic+growth+factors+VEGF-C+and+VEGF-D.">Plasmin activates the lymphangiogenic growth factors VEGF-C and VEGF-D.</a> J Exp Med. 198, 863-868 (2003).</li><li>Jaffe, E. A., Nachman, R. L., Becker, C. G., Minick, C. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Culture+of+human+endothelial+cells+derived+from+umbilical+veins.+Identification+by+morphologic+and+immunologic+criteria.">Culture of human endothelial cells derived from umbilical veins. Identification by morphologic and immunologic criteria.</a> J Clin Invest. 52, 2745-2756 (1973).</li><li>Shibuya, M., Claesson-Welsh, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Signal+transduction+by+VEGF+receptors+in+regulation+of+angiogenesis+and+lymphangiogenesis.">Signal transduction by VEGF receptors in regulation of angiogenesis and lymphangiogenesis.</a> Exp Cell Res. 312, 549-560 (2006).</li><li>Pacifici, R. E., Thomason, A. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hybrid+tyrosine+kinase/cytokine+receptors+transmit+mitogenic+signals+in+response+to+ligand.">Hybrid tyrosine kinase/cytokine receptors transmit mitogenic signals in response to ligand.</a> J Biol Chem. 269, 1571-1574 (1994).</li><li>Stacker, S. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+mutant+form+of+vascular+endothelial+growth+factor+(VEGF)+that+lacks+VEGF+receptor-2+activation+retains+the+ability+to+induce+vascular+permeability.">A mutant form of vascular endothelial growth factor (VEGF) that lacks VEGF receptor-2 activation retains the ability to induce vascular permeability.</a> J Biol Chem. 274, 34884-34892 (1999).</li><li>Davydova, N., Roufail, S., Streltsov, V. A., Stacker, S. A., Achen, M. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+VD1+neutralizing+antibody+to+vascular+endothelial+growth+factor-D:+binding+epitope+and+relationship+to+receptor+binding.">The VD1 neutralizing antibody to vascular endothelial growth factor-D: binding epitope and relationship to receptor binding.</a> J Mol Biol. 407, 581-593 (2011).</li><li>Wise, L. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Viral+vascular+endothelial+growth+factors+vary+extensively+in+amino+acid+sequence,+receptor-binding+specificities,+and+the+ability+to+induce+vascular+permeability+yet+are+uniformly+active+mitogens.">Viral vascular endothelial growth factors vary extensively in amino acid sequence, receptor-binding specificities, and the ability to induce vascular permeability yet are uniformly active mitogens.</a> J Biol Chem. 278, 38004-38014 (2003).</li><li>Davydova, N., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preparation+of+human+vascular+endothelial+growth+factor-D+for+structural+and+preclinical+therapeutic+studies.">Preparation of human vascular endothelial growth factor-D for structural and preclinical therapeutic studies.</a> Protein Expr. Purif. 82, 232-239 (2012).</li><li>Baldwin, M. E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multiple+forms+of+mouse+vascular+endothelial+growth+factor-D+are+generated+by+RNA+splicing+and+proteolysis.">Multiple forms of mouse vascular endothelial growth factor-D are generated by RNA splicing and proteolysis.</a> J. Biol. Chem. 276, 44307-44314 (2001).</li><li>Baldwin, M. E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+specificity+of+receptor+binding+by+vascular+endothelial+growth+factor-D+is+different+in+mouse+and+man.">The specificity of receptor binding by vascular endothelial growth factor-D is different in mouse and man.</a> J. Biol. Chem. 276, 19166-19171 (2001).</li><li>Makinen, T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolated+lymphatic+endothelial+cells+transduce+growth,+survival+and+migratory+signals+via+the+VEGF-C/D+receptor+VEGFR-3.">Isolated lymphatic endothelial cells transduce growth, survival and migratory signals via the VEGF-C/D receptor VEGFR-3.</a> EMBOJ. 20, 4762-4773 (2001).</li><li>Achen, M. G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Monoclonal+antibodies+to+vascular+endothelial+growth+factor-D+block+its+interactions+with+both+VEGF+receptor-2+and+VEGF+receptor-3.">Monoclonal antibodies to vascular endothelial growth factor-D block its interactions with both VEGF receptor-2 and VEGF receptor-3.</a> Eur J Biochem. 267, 2505-2515 (2000).</li><li>Bamford, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+COSMIC+(Catalogue+of+Somatic+Mutations+in+Cancer)+database+and+website.">The COSMIC (Catalogue of Somatic Mutations in Cancer) database and website.</a> Br J Cancer. 91, 355-358 (2004).</li><li>Pleasance, E. D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+comprehensive+catalogue+of+somatic+mutations+from+a+human+cancer+genome.">A comprehensive catalogue of somatic mutations from a human cancer genome.</a> Nature. 463, 191-196 (2010).</li></ol>

此处所描述的测定法依赖于使用高存活率的细胞，这是依赖于生长因子。因此细胞需要仔细培养，以确保它们是因子依赖性的，并保留嵌合受体的表达。确保介质新鲜的，而不是存放过长的时间，并且WEHI-3D​​ CM为高活性是重要的。细胞需要从含培养基的IL-3彻底洗涤进测定培养基，以确保无残留的IL-3将细胞暴露于配位体抢救时污染测定。作为配体可以来以多种不同的形式，护理需要用于测定制?...

血管内皮生长因子（VEGF）家族的分泌蛋白的生长因子和它们的同源细胞表面受体是可溶性配体和膜包埋的受体，分别在穿过细胞膜转导信号该函数的一个重要和多样的基团。它们主要发挥作用的内皮细胞，而且在和上皮来源的细胞的那些免疫系统1,2。信令由配体激活的VEGF受体（VEGFRs）是在主要的病状，如年龄相关性黄斑变性和癌症关键的，和治疗啮合途径靶向它们是在常见的临床使用（例如，单克隆抗体贝伐单抗靶向的VEGF-A）的3,4。 一项所述的VEGF家族的复杂性是存在于自然界（可溶性配体VEGF-A，VEGF-B，VEGF-C，VEGF-D，由parapox病毒家族ORF和蛇毒VEGF，加上其他编码的VEGF蛋白质的多样性抑制VEGF-A）2亚型。 这些配体与受体酪氨酸激酶家族的三个成员，即VEGFR-1，VEGFR-2和VEGFR-3相互作用。这些受体可变地表达于不同的细胞类型，但该行的所有大小5的血液和淋巴管内皮细胞的表面上常常共表达。 VEGFR-2可以结合哺乳动物配体VEGF-A 6，VEGF-C 7和VEGF-D -8,9-以及口疮病毒VEGF 10和蛇毒VEGF的11。 VEGFR-2在驱动血管发生在胚胎发育（新血管从预先存在的血管的生长），伤口愈合，癌症和眼病主要作用。在这些情况下，配体例如VEGF-A，-C和-D结合并激活血液血管内皮细胞12-15受体。上淋巴管内皮细胞，VEGFR-2在淋巴管生成的作用，新的淋巴管16的形成。 VEGFR-2还可以促进扩张和主要动脉和淋巴管在健康组织和疾病17扩张。 VEGFR-2的完整的理解：配体的相互作用是因此对于抑制剂的开发用于治疗血管生成依赖性疾病18重要。而VEGF-A结合的对VEGFR-2的大部分同种型，是必需的VEGF-C和VEGF-D的蛋白水解裂解，以释放由表现出高亲和力结合VEGFR-2 19,20的VEGF-同源结构域的片段。 我们已经开发出一种生物测定来监测，其被设计来规避初级内皮细胞，这是技术上难以通过，购买昂贵的和培养的需要VEGFR-2的配体（需要专门介质）21和表达多种VEGFRs和相关的共受体22。旨在螺柱当与其他VEGF受体或共受体VEGFR-2的异源可引起不希望的复杂性ý二进制受体-配体相互作用，评估活性归属于特定的受体，或评估抑制试剂的效果。23。生物测定保留在细胞膜相关受体的流动性，并允许的配位体的结合能力并交联的VEGFR-2的细胞外区域的评价。 生物测定依赖于其中（在这种情况下，VEGFR-2）VEGF受体的胞外区融合至跨膜和促红细胞生成素受体（EpoR的），细胞因子受体家族的一个成员的胞内区域的创建的嵌合受体8,24。此融合蛋白然后在从属因子原B细胞系的Ba / F3表示，在其上的刺激与能结合和交联的受体的胞外结构域导致胞质效应区，其能够激活一个配位体通过JAK激酶（JAKS）转导存活信号，促进细胞的存活和/或增殖。与此相反，全长VEGFR-2在相同的细胞类型，并刺激配体表达，不促进细胞存活和增殖，表明VEGFR-2通路的近端信令效应不在此细胞类型可用。 我们已经使用该测定在各种情况下，探索新的VEGFR-2的配体10,19,20,24-29的结合。在与VEGFR-3-EpoR的-的Ba / F3测定结合，我们比较了VEGF-C的结合和交联的VEGFR-2和VEGFR-3 30的相对活性和VEGF-D的生长因子。该测定法已被用于表征中和单克隆抗体对VEGFR-2或VEGF-D，可溶性VEGFR-2捕集和拟肽靶向VEGF家族31的抑制活性。该试验也用于显示的VEGF的不同ORF病毒株结合交联的VEGFR-2在测试之前在初级内皮细胞的能力，并<s达&gt; 10,26。该测定是对的VEGF的突变体的快速筛选，可以它们被引入到更费力内皮细胞分析25，或当用于净化生长评估协议因子27前被快速评估活动特别有用。 我们描述了检测容易进行，并且半定量版本允许监测的生长因子，抗体或其他实验的可溶性受体结构域的生产或纯化时有时需要快速测定。使用该测定的易用性使得它与从血液或淋巴管衍生自特定的组织或器官系统主内皮细胞进行进一步和更完全的研究，一个理想的补充。

<table border="0" cellpadding="0" cellspacing="0" width="1110">
	<tbody>
		<tr height="20">
			<td height="20" style="height:20px;width:323px;">Trypan Blue</td>
			<td style="width:183px;">Sigma-Aldrich</td>
			<td style="width:181px;">T8154</td>
			<td style="width:424px;">0.4% solution in PBS is used 1:1 with cell suspensions to measure viable cells. Hazard-may cause cancer</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">G418 Sulphate (Geneticin)</td>
			<td>Invivogen</td>
			<td>ant-gn-5</td>
			<td>Agent for selecting transfected eukaryotic cells. Hazard-may cause allergy or asthma symptoms or breathing difficluties.</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">3H-Thymidine</td>
			<td style="width:183px;">PerkinElmer</td>
			<td style="width:181px;">NET-027</td>
			<td>This radioactive nucleoside is incorporated into chromosomal DNA during mitosis. Hazard-radiation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Vialight Plus Kit</td>
			<td>Lonza</td>
			<td>LT07-221</td>
			<td>Bioluminescent detection of cellular ATP to quantify viability, using ATP Monitoring Reagent</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Prestoblue Cell Viability Reagent</td>
			<td>Invitrogen</td>
			<td>A13261</td>
			<td>Resazurin-based indicator of cell viability. Turns red in color in the reducing environment of the cell</td>
		</tr>
		<tr height="16">
			<td height="16" style="height:16px;">Nunc Minitray with Nunclon Delta Surface (72 well)</td>
			<td>Thermo Scientific</td>
			<td>136528</td>
			<td>Small microtitre plate</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:323px;">96 well Tissue Culture Plate</td>
			<td style="width:183px;">Falcon, Corning Inc.</td>
			<td style="width:181px;">353072</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:323px;">DMEM (1X)</td>
			<td style="width:183px;">Gibco</td>
			<td style="width:181px;">11965-92</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:323px;">GlutaMAX (100X)</td>
			<td style="width:183px;">Gibco</td>
			<td style="width:181px;">35050-061</td>
			<td></td>
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		<tr height="20">
			<td height="20" style="height:20px;width:323px;">Foetal Bovine Serum</td>
			<td style="width:183px;">Gibco</td>
			<td style="width:181px;">&#160;10099-141</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Cell Harvester</td>
			<td style="width:183px;">Tomtec Life Sciences</td>
			<td style="width:181px;">N/A</td>
			<td>Tomtec Harvester, 96 Mach 3M Cell Harvester</td>
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			<td height="20" style="height:20px;">Liquid Scintillation Counter</td>
			<td style="width:183px;">LKB Wallac</td>
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			<td>LKB Wallac 1205 Betaplate Scintillation Counter</td>
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			<td height="20" style="height:20px;width:323px;">UniFilter-96 GF/B</td>
			<td style="width:183px;">Perkin Elmer</td>
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			<td height="20" style="height:20px;width:323px;">Gentamicin</td>
			<td style="width:183px;">Gibco, Life Technologies</td>
			<td style="width:181px;">15750-060</td>
			<td></td>
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			<td height="20" style="height:20px;">Penicillin/Streptomycin</td>
			<td style="width:183px;">Gibco, Life Technologies</td>
			<td style="width:181px;">15140-122</td>
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		<tr height="16">
			<td height="16" style="height:16px;width:323px;">0.22um pore cellulose acetate centrifuge tube filter unit</td>
			<td style="width:183px;">Costar, Corning Inc.</td>
			<td style="width:181px;">8160</td>
			<td>Centrifuge tube filters have a 0.22&#181;m pore CA membrane-containing filter unit within a 500&#181;l capacity polypropylene microcentrifuge tube.</td>
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			<td height="16" style="height:16px;">Fluorescence Reader</td>
			<td style="width:183px;">BioTek</td>
			<td style="width:181px;">N/A</td>
			<td>BioTek Synergy 4 Hybrid Microplate Reader&#160;</td>
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</table>

a simple bioassay for the evaluation of vascular endothelial growth factors

参与血管生物学受体酪氨酸激酶及其相互作用的配体的分析常常是具有挑战性的，由于相关的受体，范围广泛的相关配体和处理专门内皮细胞的原代培养物的难度家庭的组成型表达。这里，我们描述用于检测配体的血管内皮生长因子受体-2（VEGFR-2）中，促进血管生成和淋巴管生成的信号的键传感器生物测定。编码VEGFR-2的胞外（配体结合）区的融合与跨膜和促红细胞生成素受体（EpoR的）的细胞质区域的cDNA，在因子相关性细胞系的Ba / F3表示。该细胞系生长在白细胞介素-3（IL-3）和该因子的结果的撤出在细胞的死亡存在24小时之内。在VEGFR-2 / EpoR的受体融合的表达提供了一种替代机制，促进生存和势的在能够结合和交联的融合蛋白（ 即 ，一个可以交联的VEGFR-2的胞外区）的胞外部分的配位体的存在下稳定转染的Ba / F3细胞的LLY增殖。半定量的方法，其中配位体和细胞小体积在24小时允许快速结果，并且涉及活细胞数目的替代标志物的定量方法：在测定可以通过两种方式来执行。该测定是比较容易进行，是高度响应于已知VEGFR-2的配体，可容纳的VEGFR-2的信号，如单克隆抗体的受体或配体，和可溶性配体陷阱胞抑制剂。

在这一节中，我们显示的实验展示一VEGFR-2-EpoR的-的Ba / F3生物测定（参见图1用于测定的原理）的基本特征的结果。其他已发表 ​​的研究表明在测定的替代VEGFR-2的配体，突变的VEGF分子和抑制性单克隆抗体8,10,19,24-30的更广泛的应用。 此处呈现的数据表示，其中的VEGFR-2-EpoR的-的Ba / F3生物测定来量化三种重?...

Watch this Scientific Journal Video about A Simple Bioassay for the Evaluation of Vascular Endothelial Growth Factors at JoVE.com

A Simple Bioassay for the Evaluation of Vascular Endothelial Growth Factors

我们描述了检测，定量和监测血管内皮生长因子家族的配体的成员的活性的简单的基于细胞的生物测定法。该测定法使用在因子相关性细胞系中表达的嵌合受体的配体，以提供受体结合和交联的半定量或定量的评估。

一个简单的生物测定血管内皮生长因子的评价

The analysis of receptor tyrosine kinases and their interacting ligands involved in vascular biology is often challenging due to the constitutive ...

The overall goal of this simple, cell-based bioassay is to detect, quantify, and monitor the activity of members of the vascular endothelial growth factor family of ligins. This method can answer key questions in vascular biology, virology, cancer, and opthamology, where VEG-FR family ligins radiate key processes in these diseases. The main advantage of this assay is it allows evaluation of VEG-FM family ligins in terms of their capacity to bind and cross link their different receptors without requiring specialized epithelial cells.Culture the IL3 secreting cell line WEHI-3D by pipetting five times ten to the sixth cells in the log face of growth into four to ten T175 flasks containing 50 millimeters of fresh culture medium. Incubate for seven days or until the cells have passed their log phase of growth by about 24 to 48 hours. Decant the fluid and cells from the flasks.And spin at 1, 000 Gs for 15 minutes to remove cells and cellular debris. Then remove the top 90%of supernaytent and filter it through a 0.22 micron filter unit. Aliquot the conditioned medium into one milliliter aliquots for assay preparation.50 milliliter aliquots for making culture medium to passage a factor dependent cell lines and 200 milliliter volumes for long term storage at 20 degree Celsius. Store the smaller volumes at 20 Celsius. Culture control BAF3 cells in culture media containing 10%WEHI-3D conditioned medium.and VegFR2-EPoR-BAF3 cells in the same media plus one milligram per milliliter G418. Passage cells at one to 15 dilutions from cells growing in log phase. Harvest control BAF3 or VegFR2VPoR-BAF3 cells for mid log phase cultures.By gently pipetting to remove the cells from the bottom of the flask centrifuge at 750 Gs for five minutes to recover cell pellet. Re-suspend the pellet in 10 milliliters of mouse tonicity phosphate buffered saline and centrifuge again at 750 Gs for five minutes. Repeat the wash two further times to remove medium containing IL3.Wash the cells once using media without DEHI-3D conditioned medium. It is important to wash away culture medium containing IL3 to ensure that no additional growth factors remain, which might generate a false positive result or high background activity. After centrifuging and discarding the supernayten re-suspend cells in the same IL3 free medium at a concentration of 7.4 times 10 to the fourth cells per milliliter.Finally mix equal volumes of trypan blue in PBS with a cell population and load into a hemacytometer. Count at least 100 cells. Cells that take up the dye are considered dead or dying.It is critical that cells used for the assay have high viability to ensure they are able to respond their assay conditions. Use a well calibrated P20 automated pipet and autoclaved tips to add 1, 000 cells in 13.5 microliters of IL deficient medium to the wells of a 72 well plate. Take care to mix the cell suspension during aliquoting to ensure cell settling by gravity does not bias cell concentration.Use a well calibrated P2 pipet to add 1.5 microliters of IL3 free media in triplicate to the control wells. Intrictery to mix. In the same manner add the 10%WEHI-3D conditioned medium and the 100 nanograms per milliliter VegFA no IL3 control to the desired wells.Finally add 1.5 microliters of the test samples in triplicate. Fill any unused wells of the microwell plate with sterile water, PBS or medium. Place water soaked tissue paper in a gas permeable container to create a humidified chamber that allows gas exchange.Incubate the assay plates in the chambers in a humidified atmosphere of 10%carbon dioxide for 16 hours. After 16 hours of incubation analyze the plates using a standard inverted phase microscope at 40 to 100x magnification. At this time it is possible to discriminate between positive and negative samples.Wells without support of growth factors or with medium alone will have reduced numbers of round cells as well as dead or dying cells and cellular debris. Whereas cells incubated with medium containing IL3 or ligin for VegFR2 are large and translucent and there is no or minimal evidence of granularity in the cell cytoplasm or cell debris in the culture. Add 10, 000 washed cells in 135 microliters of IL3 deficient medium to the wells of a standard 96 well plate.Use a calibrated P20 pipet to add 15 microliters of the test samples and controls to the wells. Incubate the mixture of cells growth factors and/or inhibitor agents as before for 48 hours. At the completion of the incubation period evaluate the number of viable cells in the wells using the methods outlined in the written portion of the protocol.Here are represented results of an assay in which the VEGF-R2 EPoR BAF3 bioassay is used to quantify the activity of the three recumbent human ligins with specificity for VEGF-R2. VEGF-A165, VEGF-C, and VEGF-D. Activity was quantified in the presence of bevacizumab, an inhibitory monoclonal antibody to VEGF-A165 or in the presence of trastuzumab, a non neutralizing antibody.Data have been normalized versus the response to VEGF-A165 alone. As expected bevacizumab blocked the effect of VEGF-A165 in the assay but had no effect on the activity of VEGF-C and VEGF-D. Cells exposed to IL3 were highly viable.Whereas those exposed to no additional growth factor show poor viability. When attempting this procedure it's important to bare in mind that they're a range of controlling agents in conditioned media that need to be generated prior to the assay. This technique paved the way for resurgence in vascular biology, virology, cancer and opthomology to explore the role of VEG-FM in ligins.After watching this video you should have a good understanding how to prepare the bioassay cells, to run the bioassay and to conduct the quantitative or semiquantitative analyses of VEG-FM ligin activity.

Research

JoVE Journal

Biology

A Simple Method for Imaging Arabidopsis Leaves Using Perfluorodecalin as an Infiltrative Imaging Medium

A Simple Method for Imaging Arabidopsis Leaves Using Perfluorodecalin as an Infiltrative Imaging Medium

一个影像的简单方法拟南芥叶浸润成像介质中使用全氟萘烷

The problem of acquiring high-resolution images deep into biological samples is widely acknowledged1. In air-filled tissue such as the spongy mesophyll of ...

科研

生物学

A Simple Protocol for Extracting Hemocytes from Wild Caterpillars

一个简单的协议提取血细胞从野生毛毛虫

Insect hemocytes (equivalent to mammalian white blood cells) play an important role in several physiological processes throughout an insect's life cycle ...

Simple and Efficient Technique for the Preparation of Testicular Cell Suspensions

简单和高效的睾丸细胞悬液的制备技术

Mammalian testes are very complex organs that contain over 30 different cell types, including somatic testicular cells and different stages of germline ...

Isolation of Murine Valve Endothelial Cells

鼠阀门内皮细胞的分离

Normal valve structures consist of stratified layers of specialized extracellular matrix (ECM) interspersed with valve interstitial cells (VICs) and ...

Isolation and Primary Culture of Mouse Aortic Endothelial Cells

隔离和鼠标主动脉内皮细胞原代培养

The vascular endothelium is essential to normal vascular homeostasis. Its dysfunction participates in various cardiovascular disorders. The mouse is an ...

Isolation of Murine Coronary Vascular Smooth Muscle Cells

鼠冠状动脉血管平滑肌细胞的分离

While the isolation and culture of vascular smooth muscle cells (VSMCs) from large vessels is well established, we sought to isolate and culture VSMCs ...

Filtration Isolation of Nucleic Acids:  A Simple and Rapid DNA Extraction Method

核酸的分离过滤：一种简单快速的DNA提取方法

FINA, filtration isolation of nucleic acids, is a novel extraction method which utilizes vertical filtration via a separation membrane and absorbent pad ...

Molecular Analysis of Endothelial-mesenchymal Transition Induced by Transforming Growth Factor-&#946; Signaling

转化生长因子β信号诱导内皮-间质转移的分子分析

Phenotypic plasticity of endothelial cells underlies cardiovascular system development, cardiovascular diseases, and various conditions associated with ...

Using En Face Immunofluorescence Staining to Observe Vascular Endothelial Cells Directly

使用 En 面免疫荧光染色直接观察血管内皮细胞

Aberrant changes in endothelial phenotype and morphology are considered to be initial events in the pathogenesis of atherosclerosis. Direct observation of ...