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Cell Surface Tetraspanin Tspan8 Contributes to Molecular Pathways of Exosome-Induced Endothelial Cell Activation

Nazarenko, Irina, Rana, Sanyukta, Baumann, Alexandra, McAlear, Jessica, Hellwig, Andrea, Trendelenburg, Michael, Lochnit, Günter, Preissner, Klaus T., Zöller, Margot·2010·Cancer Research

Abstract

Tumor-derived exosomes containing the tetraspanin Tspan8 can efficiently induce angiogenesis in tumors and tumor-free tissues. However, little information exists on exosome–endothelial cell (EC) interactions or the proangiogenic role of tetraspanins, which are a constitutive component of exosomes. In this study, we used a rat adenocarcinoma model (AS-Tspan8) to explore the effects of exosomal Tspan8 on angiogenesis. Tspan8 contributed to a selective recruitment of proteins and mRNA into exosomes, including CD106 and CD49d, which were implicated in exosome-EC binding and EC internalization. We found that EC internalized Tspan8-CD49d complex–containing exosomes. Exosome uptake induced vascular endothelial growth factor (VEGF)–independent regulation of several angiogenesis-related genes, including von Willebrand factor, Tspan8, chemokines CXCL5 and MIF, chemokine receptor CCR1, and, together with VEGF, VEGF receptor 2. EC uptake of Tspan8-CD49d complex–containing exosomes was accompanied by enhanced EC proliferation, migration, sprouting, and maturation of EC progenitors. Unraveling these new pathways of exosome-initiated EC regulation could provide new options for therapeutic interference with tumor-induced angiogenesis. Cancer Res; 70(4); 1668–78

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Crossref · 10.1158/0008-5472.can-09-2470

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Metadata

Authors
Nazarenko, I., Rana, S., Baumann, A., McAlear, J., Hellwig, A., Trendelenburg, M., Lochnit, G., Preissner, K. T., & Zöller, M.
Venue
Cancer Research
Published
2010-02-14
Volume
70
Issue
4
Pages
1668-1678
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2153840858
Cited by
686
References
2
FWCI
12.05
Type
journal article
Language
en
Open access
closed

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