The cell surface structure of tumor endothelial marker 8 (TEM8) is regulated by the actin cytoskeleton.

The cell surface structure of tumor endothelial marker 8 (TEM8) is regulated by the actin cytoskeleton.
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DOI:
10.1016/j.bbamcr.2010.11.013
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发表时间:
2011-01
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
St Croix B
St Croix B
中科院分区:
其他
文献类型:
--
作者:
Yang MY;Chaudhary A;Seaman S;Dunty J;Stevens J;Elzarrad MK;Frankel AE;St Croix B

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肿瘤内皮标志物8 (Tumor Endothelial Marker 8, TEM8)是一种在肿瘤血管中表达上调的整合素样细胞表面蛋白,是肿瘤治疗的潜在血管靶点。在这里,我们发现抗TEM8抗体克隆SB5识别细胞表面TEM8胞外结构域的能力取决于其他宿主细胞因子。通过利用SB5区分不同形式细胞表面TEM8的能力,我们确定了α -平滑肌肌动蛋白和transgelin(一种肌动蛋白结合蛋白)作为能够改变TEM8细胞表面结构的细胞内因子。在细胞中过度表达这两种蛋白中的任何一种,可将TEM8从sb5转化为sb5屏蔽形式,并保护细胞免受sb5皂苷免疫毒素的侵害。由于细胞表面的主要形式的TEM8不被SB5识别,我们还开发了一种新的单克隆抗体,称为AF334,它能够识别SB5暴露和SB5掩盖形式的TEM8。AF334-saporin选择性杀伤TEM8阳性细胞,不依赖于TEM8细胞表面结构。这些研究表明,TEM8以不同的形式存在于细胞表面,这种结构依赖于与肌动蛋白细胞骨架组分的相互作用,这将有助于合理设计最有效的诊断和治疗抗TEM8单克隆抗体。
Tumor Endothelial Marker 8 (TEM8) is an integrin-like cell surface protein upregulated on tumor blood vessels and a potential vascular target for cancer therapy. Here, we found that the ability of an anti-TEM8 antibody, clone SB5, to recognize the extracellular domain of TEM8 on the cell surface depends on other host-cell factors. By taking advantage of SB5’s ability to distinguish different forms of cell-surface TEM8, we identified alpha-smooth muscle actin and transgelin, an actin binding protein, as intracellular factors able to alter TEM8 cell surface structure. Overexpression of either of these proteins in cells converted TEM8 from an SB5-exposed to an SB5-masked form and protected cells from SB5-saporin immunotoxins. Because the predominant form of TEM8 on the cell surface is not recognized by SB5, we also developed a new monoclonal antibody, called AF334, which is able to recognize both the SB5-exposed and the SB5-masked forms of TEM8. AF334-saporin selectively killed TEM8-positive cells independent of TEM8 cell surface structure. These studies reveal that TEM8 exists in different forms at the cell surface, a structure dependent on interactions with components of the actin cytoskeleton, and should aid in the rational design of the most effective diagnostic and therapeutic anti-TEM8 monoclonal antibodies.
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