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Erschienen in: Annals of Surgical Oncology 9/2006

01.09.2006

An Endogenous Inhibitor of Angiogenesis derived from a Transitional Cell Carcinoma: Clipped β2-Glycoprotein-I

verfasst von: Wolf-Dietrich C. Beecken, Tobias Engl, Eva M. Ringel, Kevin Camphausen, Martin Michaelis, Dietger Jonas, Judah Folkman, Yuen Shing, Roman A. Blaheta

Erschienen in: Annals of Surgical Oncology | Ausgabe 9/2006

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Abstract

Background

Invasive cell carcinoma of the bladder often develops after complete transurethral excision of superficial transitional cell carcinoma. It has been postulated that primary tumors release angiogenesis-blocking proteins which suppress distant metastases. We have identified an endogenous protein which might be responsible for tumor dormancy.

Methods

A transitional cell carcinoma cell line was developed (UMUC-3i) which inhibits the growth of a tumor implant at a distant site in SCID mice. Conditioned media of UMUC-3i cultured cells was first pooled and then fractioned, and the capacity of individual components to block endothelial cell growth was tested. The protein fraction responsible for blocking endothelial cell growth was identified by N-terminal amino acid sequencing as well as by mass-spectrometry. The effects of the purified protein in preventing endothelial cell proliferation and tube formation in an in vitro angiogenesis assay was investigated.

Results

The plasma protein β2-glycoprotein-I (β2gpI) was isolated and identified from conditioned medium of UMUC-3i cultured cells. Based on the in vitro angiogenesis assay, β2gpI strongly inhibited endothelial cell growth and tube formation, whereby the inhibitory activity corresponded to the clipped version of β2gpI (cβ2gpI). Clipping was induced by adding plasmin at a molar ratio 1:15 (plasmin:substrate). Further analysis indicated that cβ2gpI effects were mediated by annexin II surface receptors expressed on endothelial cells.

Conclusions

cβ2gpI may be involved in blocking angiogenic processes and bladder cancer progression. In this case, cβ2gpI may be a promising tool in bladder cancer therapy.
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Metadaten
Titel
An Endogenous Inhibitor of Angiogenesis derived from a Transitional Cell Carcinoma: Clipped β2-Glycoprotein-I
verfasst von
Wolf-Dietrich C. Beecken
Tobias Engl
Eva M. Ringel
Kevin Camphausen
Martin Michaelis
Dietger Jonas
Judah Folkman
Yuen Shing
Roman A. Blaheta
Publikationsdatum
01.09.2006
Verlag
Springer-Verlag
Erschienen in
Annals of Surgical Oncology / Ausgabe 9/2006
Print ISSN: 1068-9265
Elektronische ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-006-9009-9

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