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

Mi Young Yang, Amit Chaudhary, Steven Seaman, Jill Dunty, Janine Stevens, Mohammed K. Elzarrad, Arthur E. Frankel, Brad St.Croix

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)39-49
Number of pages11
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Volume1813
Issue number1
DOIs
StatePublished - Jan 2011

Fingerprint

Tumor Biomarkers
Actin Cytoskeleton
Monoclonal Antibodies
Vascular Tissue Neoplasms
Immunotoxins
Microfilament Proteins
Integrins
Smooth Muscle
Blood Vessels
Actins
Membrane Proteins
Clone Cells

Keywords

  • Actin cytoskeleton
  • Angiogenesis
  • ANTXR1
  • Endothelial
  • TEM8

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

Cite this

The cell surface structure of tumor endothelial marker 8 (TEM8) is regulated by the actin cytoskeleton. / Yang, Mi Young; Chaudhary, Amit; Seaman, Steven; Dunty, Jill; Stevens, Janine; Elzarrad, Mohammed K.; Frankel, Arthur E.; St.Croix, Brad.

In: Biochimica et Biophysica Acta - Molecular Cell Research, Vol. 1813, No. 1, 01.2011, p. 39-49.

Research output: Contribution to journalArticle

Yang, Mi Young ; Chaudhary, Amit ; Seaman, Steven ; Dunty, Jill ; Stevens, Janine ; Elzarrad, Mohammed K. ; Frankel, Arthur E. ; St.Croix, Brad. / The cell surface structure of tumor endothelial marker 8 (TEM8) is regulated by the actin cytoskeleton. In: Biochimica et Biophysica Acta - Molecular Cell Research. 2011 ; Vol. 1813, No. 1. pp. 39-49.
@article{4ace0f8126e346bb8e664d17267c4d37,
title = "The cell surface structure of tumor endothelial marker 8 (TEM8) is regulated by the actin cytoskeleton",
abstract = "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.",
keywords = "Actin cytoskeleton, Angiogenesis, ANTXR1, Endothelial, TEM8",
author = "Yang, {Mi Young} and Amit Chaudhary and Steven Seaman and Jill Dunty and Janine Stevens and Elzarrad, {Mohammed K.} and Frankel, {Arthur E.} and Brad St.Croix",
year = "2011",
month = "1",
doi = "10.1016/j.bbamcr.2010.11.013",
language = "English (US)",
volume = "1813",
pages = "39--49",
journal = "Biochimica et Biophysica Acta - Molecular Cell Research",
issn = "0167-4889",
publisher = "Elsevier",
number = "1",

}

TY - JOUR

T1 - The cell surface structure of tumor endothelial marker 8 (TEM8) is regulated by the actin cytoskeleton

AU - Yang, Mi Young

AU - Chaudhary, Amit

AU - Seaman, Steven

AU - Dunty, Jill

AU - Stevens, Janine

AU - Elzarrad, Mohammed K.

AU - Frankel, Arthur E.

AU - St.Croix, Brad

PY - 2011/1

Y1 - 2011/1

N2 - 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.

AB - 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.

KW - Actin cytoskeleton

KW - Angiogenesis

KW - ANTXR1

KW - Endothelial

KW - TEM8

UR - http://www.scopus.com/inward/record.url?scp=78650138302&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78650138302&partnerID=8YFLogxK

U2 - 10.1016/j.bbamcr.2010.11.013

DO - 10.1016/j.bbamcr.2010.11.013

M3 - Article

VL - 1813

SP - 39

EP - 49

JO - Biochimica et Biophysica Acta - Molecular Cell Research

JF - Biochimica et Biophysica Acta - Molecular Cell Research

SN - 0167-4889

IS - 1

ER -