Name: a gpc3-targeting bispecific antibody, gpc3-s-fab, with potent cytotoxicity
Uploaded: 2018-07-12T13:00:00
Description: Watch this Scientific Journal Video about A GPC3-targeting Bispecific Antibody, GPC3-S-Fab, with Potent Cytotoxicity at JoVE.com

这项工作得到了广东省 (2016A050503028) 研究 & 开发计划的资助。

所有的程序, 包括人的血液收集被孙中山大学伦理委员会批准。
1. GPC3-S-Fab 设计策略
<ol><li>设计 GPC3-S-Fab 通过链接一个 anti-GPC3 (人性化的 GC3313) 与 anti-CD16 VHH14 (图 1)。</li>
	<li>将 VH-CH1-CD16-VHH 和 pET26b 和 pET21a 载体合成并克隆为先前报告的12。</li>
</ol>2. 变革和文化
<ol><li>将含有 VH-CH...

<ol>
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B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Glypicans:+proteoglycans+with+a+surprise.">Glypicans: proteoglycans with a surprise.</a> Journal of Clinical Investigation. 108 (4), 497-501 (2001).</li><li>Baumhoer, 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=Glypican+3+expression+in+human+nonneoplastic,+preneoplastic,+and+neoplastic+tissues:+a+tissue+microarray+analysis+of+4,387+tissue+samples.">Glypican 3 expression in human nonneoplastic, preneoplastic, and neoplastic tissues: a tissue microarray analysis of 4,387 tissue samples.</a> American Journal of Clinical Pathology. 129 (6), 899-906 (2008).</li><li>Llovet, J. 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=A+molecular+signature+to+discriminate+dysplastic+nodules+from+early+hepatocellular+carcinoma+in+HCV+cirrhosis.">A molecular signature to discriminate dysplastic nodules from early hepatocellular carcinoma in HCV cirrhosis.</a> Gastroenterology. 131 (6), 1758-1767 (2006).</li><li>Zhu, Z. W., 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=Enhanced+glypican-3+expression+differentiates+the+majority+of+hepatocellular+carcinomas+from+benign+hepatic+disorders.">Enhanced glypican-3 expression differentiates the majority of hepatocellular carcinomas from benign hepatic disorders.</a> Gut. 48 (4), 558-564 (2001).</li><li>Hsu, H. C., Cheng, W., Lai, P. 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在这项研究中, 我们提出了一个新的格式 bsAbs, GPC3-S-Fab, 它可以招募 NK 细胞靶向 GPC3 阳性肿瘤细胞。s-工厂是基于自然的晶圆格式, 添加一个 anti-CD16 VHH11,12。与含 Fc 区的 bsAbs 相比, GPC3-S-Fab 可以很容易地在细菌 periplasm 中产生。
利用该协议中描述的表达式和纯化策略, 得到了大量的可溶性和功能 GPC3-S-Fab。为便于周质表达, 政局在 N 终...

单克隆抗体现在广泛用于癌症治疗1。由于抗体的柔韧性, 各种基于抗体的格式已经得到了积极的探索。与单克隆抗体相比, bsAbs 有两种不同的抗原结合模块, 能够同时识别两个不同靶点, 有效地触发免疫效应细胞的招募, 以靶向和杀死肿瘤细胞2。
当前的重组 bsAb 格式通常可以分配给两个类: fc 包含 bsAbs 和 bsAbs, 而没有 fc 区域。与大多数哺乳动物细胞中所含 fc 格式相比, 没有 fc 区域的 bsAbs 具有较小尺寸的优点, 更容易在微生物表达系统中产生, 并且能更有效地穿透肿瘤组织。3。
没有 Fc 区域的 bsAbs 通常是通过链接单个绑定基团 (如单链变量片段 (scFvs) 或3) 来形成的。如果没有稳定的域, 基于抗体碎片的 bsAbs 通常会损害热稳定性、低溶解度或增加聚集4、5的潜力。相比之下, 以 bsAbs 为基础的 heterodimerization, 由于 CH1 和 CL 在原生的晶圆4,6, 更稳定。
由重链抗体 (VHHs, 也称为单域抗体) 的可变域是天然重链抗体的活性抗原结合片段7。VHHs 具有亲和力高、常规 IgGs8特异性强、免疫原化低、细菌表达率高的特点9。与抗体片段相比, VHHs 具有较高的热稳定性10。与基团相比, VHHs 的尺寸较小, 因为缺乏 CH1 和 CL。因此, 通过将 bsAb 与单域抗体、VHH 相连接获得的 S 型, 设计并研究了其抗肿瘤作用11、12。
本文介绍了 hGC3313与 anti-CD16a VHH14相结合的 GPC3-S-Fab 结构。周质在大肠杆菌(大肠杆菌)中的表达能有效地产生 GPC3-S-Fab。GPC3-S-Fab 的功能性研究表明 GPC3-S-Fab 是肝癌治疗的一个有前途的策略。因此, GPC3-S-Fab 在替代技术上的优势和适用于以前研究的参考, 包括易于生产和纯化, 以及更稳定的 bsAbs。
哺乳动物表达系统和原核表达系统已被用来表达各种形式的 BsAbs。与哺乳动物表达系统相比,大肠杆菌蛋白表达系统具有产量高、成本低、省力、遗传操作方便、转化效率高15的优点。对于 bsAbs 在大肠杆菌中的表达, 有两种基本策略: 细胞质中的表达和细胞质与外细胞膜之间 periplasm 的表达15。与细胞质的还原环境相比, periplasm 是一种比较氧化的环境, 促进了蛋白质16的正确折叠和共表达。正确的折叠对 bsAbs 的溶解度、稳定性和功能生成起着关键的作用。因此, 在 s--政局的 N 端添加了一个信号序列, 直接分泌到大肠杆菌的 periplasm17。为了确保正确的折叠、溶解度、热稳定性和构象稳定性, 减少抗体的复杂性和大小经常被使用16。S-晶圆的格式包括一个工厂和一个 VHH, 这是表达很好的细菌系统可能由于简单的结构和小规模。
GPC3 是在这种 GPC3-S-Fab 双特异性抗体格式中选择的。Glypican-3 (GPC3) 是肝素硫酸盐 (HS) 蛋白多糖家族的成员, 通过 glycosylphosphatidylinositol (GPI)18锚定在细胞表面。GPC3 是抗原70% 肝癌 (HCC) 病例, 占大多数肝癌19,20,21,22。由于 GPC3 在正常组织中很少表达, GPC3 被建议为肝癌的潜在靶向。对 GPC3 产生了多个鼠标抗体。然而, 只有 GC33 显示有限的抗肿瘤活动22, 它没有表现出临床疗效的病人。在这项研究中, GPC3-S-Fab 被证明能够招募 NK 细胞杀死 GPC3 肿瘤细胞14。
为了招募 NK 细胞, 使用了 anti-CD16 VHH。CD16a 是一种低亲和 IgG 受体, 主要表现为自然杀伤细胞、巨噬素、单核和 T 细胞的某些亚型。它涉及抗体依赖性细胞细胞毒性 (ADCC) 的 NK 细胞23。人 NK 细胞可分为两类, CD56-CD16+ 和 CD56+CD16。与 CD56+CD16− nk 细胞相比, CD56-CD16+ nk 细胞可以释放出更高水平的穿孔和颗粒酶 B, 从而呈现出强烈的细胞毒性24。枯否细胞 (KCs), 表达 CD16a, 是肝脏中的巨细胞。枯否细胞在25肝癌的抑癌中起着重要作用。因此, bsAbs 靶向 CD16a 可能是一个更有希望的策略比接触 T 细胞对抗肝癌。

<table>
	<tbody>
		<tr>
			<td>Shaking incubator</td>
			<td>Thermo Fisher</td>
			<td>MAXQ 4000</td>
			<td></td>
		</tr>
		<tr>
			<td>Shaking incubator</td>
			<td>Zhicheng</td>
			<td>ZWYR-D2402</td>
			<td></td>
		</tr>
		<tr>
			<td>Centrifuge</td>
			<td>Cence</td>
			<td>GL-10MD</td>
			<td></td>
		</tr>
		<tr>
			<td>Centrifuge</td>
			<td>Beckman coulter</td>
			<td>Avanti j-26S XPI</td>
			<td></td>
		</tr>
		<tr>
			<td>Centrifuge</td>
			<td>eppendorf</td>
			<td>5810R</td>
			<td></td>
		</tr>
		<tr>
			<td>Ultraviolet spectrophotometer</td>
			<td>Thermo Fisher</td>
			<td>Nanodrop</td>
			<td></td>
		</tr>
		<tr>
			<td>Analytical polyacrylamide gel electrophoresis apparatus</td>
			<td>Mini-PROTEAN&#174; Tetra</td>
			<td>Bio-rad</td>
			<td></td>
		</tr>
		<tr>
			<td>Trans-blot apparatus</td>
			<td>Criterion</td>
			<td>Bio-rad</td>
			<td></td>
		</tr>
		<tr>
			<td>Imaging system</td>
			<td>Bio-rad</td>
			<td>chemidoc tm XRS+</td>
			<td></td>
		</tr>
		<tr>
			<td>Fast Protein Liquid chromatogram</td>
			<td>GE Healthcare</td>
			<td>AKTA avant</td>
			<td></td>
		</tr>
		<tr>
			<td>GF column</td>
			<td>GE Healthcare</td>
			<td>28-9909-44 Superdex 200 Increase 10/300 GL</td>
			<td></td>
		</tr>
		<tr>
			<td>Flow Cytometer</td>
			<td>Beckman coulter</td>
			<td>FC500</td>
			<td></td>
		</tr>
		<tr>
			<td>Centrifuge</td>
			<td>eppendorf</td>
			<td>5702R</td>
			<td></td>
		</tr>
		<tr>
			<td>Envision plate reader</td>
			<td>TECAN</td>
			<td>Infinite F50</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti His-tag</td>
			<td>eBioscience</td>
			<td>14-6657-82</td>
			<td></td>
		</tr>
		<tr>
			<td>anti-Flag-tag</td>
			<td>Sigma</td>
			<td>F1804</td>
			<td></td>
		</tr>
		<tr>
			<td>anti-human(H&#38;L)-488</td>
			<td>A11013</td>
			<td>Invitrogen</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-mouse IgG HRP-linked antibody</td>
			<td>Cell Signaling</td>
			<td>7076S</td>
			<td></td>
		</tr>
		<tr>
			<td>Ni-NTA-Agarose</td>
			<td>Tribioscience</td>
			<td>TBS9202-100</td>
			<td></td>
		</tr>
		<tr>
			<td>IgG-CH1 affinity resin</td>
			<td>Thermo Fisher</td>
			<td>194320005</td>
			<td></td>
		</tr>
		<tr>
			<td>Ficoll-Plaque Plus</td>
			<td>GE Healthcare</td>
			<td>17-1440-03</td>
			<td></td>
		</tr>
		<tr>
			<td>NK cell enrichment kit</td>
			<td>Stemcell</td>
			<td>19055</td>
			<td></td>
		</tr>
		<tr>
			<td>Magnet</td>
			<td>Stemcell</td>
			<td>18000</td>
			<td></td>
		</tr>
		<tr>
			<td>CCK8 kit</td>
			<td>Dojindo</td>
			<td>CK04</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM</td>
			<td>Gibco</td>
			<td>C11995500CP</td>
			<td></td>
		</tr>
		<tr>
			<td>RPMI-1640</td>
			<td>Gibco</td>
			<td>C11875500CP</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal Bovine Serum (FBS)</td>
			<td>Sigma</td>
			<td>F2442</td>
			<td></td>
		</tr>
		<tr>
			<td>Trypsin</td>
			<td>Gibco</td>
			<td>15050-057</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin-Streptomycin</td>
			<td>Gibco</td>
			<td>15140-122</td>
			<td>Cell culture</td>
		</tr>
		<tr>
			<td>Standard marker</td>
			<td>Sigma Aldrich</td>
			<td>MWGF200</td>
			<td>Gel filtration</td>
		</tr>
		<tr>
			<td>Isopropyl-b-D-thio-galactopyranoside (IPTG)</td>
			<td>VWR chemicals</td>
			<td>VWRC0487-100G</td>
			<td></td>
		</tr>
		<tr>
			<td>Dialysis tubing</td>
			<td>Sigma Aldrich</td>
			<td>D0655-100FT</td>
			<td></td>
		</tr>
		<tr>
			<td>Knanamycine</td>
			<td>VWR</td>
			<td>VWRC0408-100G</td>
			<td></td>
		</tr>
		<tr>
			<td>Ampicillin</td>
			<td>VWR</td>
			<td>VWRC0339-100G</td>
			<td></td>
		</tr>
		<tr>
			<td>Tryptone</td>
			<td>Thermo Fisher</td>
			<td>LP0042B</td>
			<td></td>
		</tr>
		<tr>
			<td>Yeast Extract</td>
			<td>Thermo Fisher</td>
			<td>LP0021B</td>
			<td></td>
		</tr>
		<tr>
			<td>NaCl</td>
			<td>Sangon Biotech</td>
			<td>A100241</td>
			<td></td>
		</tr>
		<tr>
			<td>Trizma base</td>
			<td>Sigma Aldrich</td>
			<td>T6791-1KG</td>
			<td></td>
		</tr>
		<tr>
			<td>EDTA</td>
			<td>Sigma Aldrich</td>
			<td>V900106</td>
			<td></td>
		</tr>
		<tr>
			<td>Glycine</td>
			<td>aladdin</td>
			<td>A110752-500g</td>
			<td></td>
		</tr>
		<tr>
			<td>KCl</td>
			<td>aladdin</td>
			<td>P112134-500g</td>
			<td></td>
		</tr>
		<tr>
			<td>MgCl</td>
			<td>Sigma Aldrich</td>
			<td>V900020</td>
			<td></td>
		</tr>
		<tr>
			<td>Agar</td>
			<td>Sangon Biotech</td>
			<td>A505255-0250</td>
			<td></td>
		</tr>
		<tr>
			<td>Potassium Phosphate, Monobasic Anhydrous (KH2PO4)</td>
			<td>VWR</td>
			<td>7778-77-0</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium Phosphate, Dibasic, Anhydrous (Na2HPO4)</td>
			<td>VWR</td>
			<td>7558-79-4</td>
			<td></td>
		</tr>
		<tr>
			<td>2-Mercaptoethanol</td>
			<td>VWR</td>
			<td>60-24-2</td>
			<td></td>
		</tr>
		<tr>
			<td>Phenylmethyl Sulfonyl Fluoride (PMSF)</td>
			<td>VWR</td>
			<td>329-98-6</td>
			<td></td>
		</tr>
		<tr>
			<td>Lysozyme</td>
			<td>Sigma Aldrich</td>
			<td>L6876-25G</td>
			<td></td>
		</tr>
		<tr>
			<td><a name="RANGE!A50">Coomassie Brilliant Blue R250</a></td>
			<td>VWR</td>
			<td>VWRC0472-50G</td>
			<td></td>
		</tr>
		<tr>
			<td>Bromophenol blue</td>
			<td>Sangon Biotech</td>
			<td>A500922-25G</td>
			<td></td>
		</tr>
		<tr>
			<td>Bovine Serum Albumin (BSA)</td>
			<td>VWR</td>
			<td>VWRC0332-100G</td>
			<td></td>
		</tr>
		<tr>
			<td>Glycerol</td>
			<td>Sigma Aldrich</td>
			<td>V900122</td>
			<td></td>
		</tr>
		<tr>
			<td>100mm x 20mm plastic dish</td>
			<td>Corning</td>
			<td>430167</td>
			<td></td>
		</tr>
		<tr>
			<td>25cm2 flask</td>
			<td>Corning</td>
			<td>430639</td>
			<td></td>
		</tr>
		<tr>
			<td>96 well cell culture cluster</td>
			<td>Corning</td>
			<td>3599</td>
			<td></td>
		</tr>
		<tr>
			<td>Sucrose</td>
			<td>Sangon Biotech</td>
			<td>A610498-0005</td>
			<td></td>
		</tr>
		<tr>
			<td>CHO</td>
			<td>the Type Culture Collection of the Chinese Academy of Sciences</td>
			<td>GNHa 3</td>
			<td></td>
		</tr>
		<tr>
			<td>MHCC-97H</td>
			<td>the Type Culture Collection of the Chinese Academy of Sciences</td>
			<td>SCSP-528</td>
			<td></td>
		</tr>
		<tr>
			<td>HepG2</td>
			<td>the Type Culture Collection of the Chinese Academy of Sciences</td>
			<td>TCHu 72</td>
			<td></td>
		</tr>
		<tr>
			<td>Huh7</td>
			<td>the Type Culture Collection of the Chinese Academy of Sciences</td>
			<td>TCHu182</td>
			<td></td>
		</tr>
		<tr>
			<td>Hep3B</td>
			<td>the Type Culture Collection of the Chinese Academy of Sciences</td>
			<td>TCHu106</td>
			<td></td>
		</tr>
		<tr>
			<td>NK92</td>
			<td>ATCC</td>
			<td>CRL2408</td>
			<td></td>
		</tr>
	</tbody>
</table>

a gpc3-targeting bispecific antibody, gpc3-s-fab, with potent cytotoxicity

该协议描述了双特异性抗体 (bsAb) 的构建和功能研究, GPC3-S-Fab。bsAbs 可以通过两个不同的手臂识别两个不同的表位。bsAbs 已积极研究他们的能力, 直接招募免疫细胞杀死肿瘤细胞。目前, 大多数 bsAbs 是以重组蛋白的形式生产的, 它们要么是含有 fc 的 bsAbs, 要么是没有 fc 区域的较小的 bsAb 衍生物。本研究通过将 anti-GPC3 抗体 GC33 与 anti-CD16 单域抗体相结合, 设计了一种基于抗体片段 (GPC3-S-Fab) 的双特异性抗体。GPC3-S-Fab 可在大肠杆菌中表达, 并经两种亲和 chromatographies 纯化。纯化的 GPC3-S-Fab 可以通过招募自然杀伤细胞来明确地结合和杀死 GPC3 阳性肝癌细胞, 这表明 GPC3-S-Fab 在肝癌治疗中的潜在应用。

GPC3-S-Fab 净化
GPC3-S-Fab 从大肠杆菌中纯化, 经两步亲和纯化, 先用镍 NTA 琼脂糖, 其次 IgG-CH1 亲和纯化。两步亲和纯化后, GPC3-S-Fab 被纯化为同质性, 两链接近 1:1 (图 2A)。VH-CH1-CD16 VHH 和 cl 多肽的存在可以通过它们独特的 C 终端标记来识别, 反他的大约 25 kDa, 以及 VH-CH1-VHH 大约 38 kDa 的反旗 (...

Watch this Scientific Journal Video about A GPC3-targeting Bispecific Antibody, GPC3-S-Fab, with Potent Cytotoxicity at JoVE.com

A GPC3-targeting Bispecific Antibody, GPC3-S-Fab, with Potent Cytotoxicity

在此, 我们提出了一种在大肠杆菌中产生双特异性抗体 GPC3-S-Fab 的协议.纯化 GPC3-S-Fab 对 GPC3 阳性肝癌细胞具有较强的细胞毒性作用。

GPC3-targeting 双特异性抗体, GPC3-S-Fab, 具有强大的细胞毒性

This protocol describes the construction and functional studies of a bispecific antibody (bsAb), GPC3-S-Fab. bsAbs can recognize two different epitopes ...

Research

JoVE Journal

Cancer Research

Labeling of Breast Cancer Patient-derived Xenografts with Traceable Reporters for Tumor Growth and Metastasis Studies

可追踪记者乳腺癌患者来源的移植瘤贴标肿瘤生长和转移的研究

The use of preclinical models to study tumor biology and response to treatment is central to cancer research. Long-established human cell lines, and many ...

科研

癌症研究

Potentiation of Anticancer Antibody Efficacy by Antineoplastic Drugs: Detection of Antibody-drug Synergism Using the Combination Index Equation

抗肿瘤药物对抗癌抗体疗效的潜力: 用组合指数方程检测抗体-药物协同作用

Potentiation of hostile monoclonal antibodies (mAb) by chemotherapeutic agents constitutes a valuable strategy for designing effective and safer therapy ...

In Vivo Immunofluorescence Localization for Assessment of Therapeutic and Diagnostic Antibody Biodistribution in Cancer Research

在Vivo免疫荧光定位中用于评估癌症研究中的治疗和诊断抗体生物分布

Monoclonal antibodies (mAbs) are important tools in cancer detection, diagnosis, and treatment. They are used to unravel the role of proteins in ...

Generation of Orthotopic Pancreatic Tumors and Ex vivo Characterization of Tumor-Infiltrating T Cell Cytotoxicity

Generation of Orthotopic Pancreatic Tumors and Ex vivo Characterization of Tumor-Infiltrating T Cell Cytotoxicity

正交胰腺肿瘤的产生与肿瘤渗透T细胞细胞毒性的外体特征

In vivo models of pancreatic cancer provide invaluable tools for studying disease dynamics, immune infiltration and new therapeutic strategies. The ...

Analyzing Tumor and Tissue Distribution of Target Antigen Specific Therapeutic Antibody

靶性抗原特异性治疗抗体的肿瘤及组织分布分析

Monoclonal antibodies are high affinity multifunctional drugs that work by variable independent mechanisms to eliminate cancer cells. Over the last few ...

An Automated Differential Nuclear Staining Assay for Accurate Determination of Mitocan Cytotoxicity

自动差分核染色测定，准确测定三元细胞毒性

The contribution of mitochondria to oncogenic transformation is a subject of wide interest and active study. As the field of cancer metabolism becomes ...

Monitoring Cancer Cell Invasion and T-Cell Cytotoxicity in 3D Culture

监测三D培养中的癌细胞入侵和T细胞毒性

Significant progress has been made in treating cancer with immunotherapy, although a large number of cancers remain resistant to treatment. A limited ...

Chemical Conjugation of a Purified DEC-205-Directed Antibody with Full-Length Protein for Targeting Mouse Dendritic Cells In Vitro and In Vivo

Chemical Conjugation of a Purified DEC-205-Directed Antibody with Full-Length Protein for Targeting Mouse Dendritic Cells In Vitro and In Vivo

纯化的DEC-205定向抗体与全长蛋白的化学偶联，用于在体外和体内靶向小鼠树突状细胞

Targeted antigen delivery to cross-presenting dendritic cells (DC) in vivo efficiently induces T effector cell responses and displays a valuable approach ...

Experimental Melanoma Immunotherapy Model Using Tumor Vaccination with a Hematopoietic Cytokine

使用造血细胞因子接种肿瘤的实验性黑色素瘤免疫治疗模型

Fms-like tyrosine kinase 3 ligand (Flt3L) is a hematopoietic cytokine that promotes the survival and differentiation of dendritic cells (DCs). It has been ...

Tracking Bispecific Antibody-Induced T Cell Trafficking Using Luciferase-Transduced Human T Cells

使用荧光素酶转导的人T细胞追踪双特异性抗体诱导的T细胞运输

T cell-engaging bispecific antibodies (T-BsAbs) are in various stages of preclinical development and clinical testing for solid tumors. Factors such as ...