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TAE226-mediated inhibition of focal adhesion kinase interferes with tumor angiogenesis and vasculogenesis

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Summary

Neoangiogenesis plays an important role in tumor growth and metastasis. Evaluation of new anti-angiogenic targets may broaden the armament for future therapeutic concepts. Focal adhesion kinase (FAK), expressed in endothelial and tumor cells, is essential for adhesion and mobility of adherent cells. In the current study we analyzed the anti-angiogenic properties of the FAK inhibitor TAE226 on the proliferation of blood outgrowth endothelial cell (OEC) and differentiation of endothelial progenitor cells (EPC), derived from peripheral blood CD133+ cells, tube formation and on neovascularization in a HT29 xenotransplant model. The effects of TAE226 were compared to those of the rapamycin analogue RAD001. The combination of both drugs was also studied. We showed that HT29 tumor cells and OEC were most sensitive to the action of TAE226 compared to EPC in vitro. In contrast, RAD001 affected the proliferation of both types of endothelial cells stronger than that of HT29 cells. Furthermore we could show that TAE226 inhibited tube formation in a dose dependent manner. In a HT29 subcutaneous tumor model TAE226 and RAD001 diminished MVD at commonly employed doses to a similar degree. Combination of both compounds did not show synergy in vitro or in vivo. Since TAE226 has been shown to inhibit the PI3 kinase, Akt kinase, mTor pathway, addition of RAD001 may not increase this effect. In conclusion, we have shown that treatment with TAE leads to a reduction of neoangiogenesis in vitro and in a mouse model. The effects are mediated by inhibition of angiogenesis and vasculogenic OEC and EPC.

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Abbreviations

BW:

Body weight

EC:

Endothelial cell

EPC:

Endothelial progenitor cell

FAK:

Focal adhesion kinase

HT29:

Colon carcinoma cell line

mTOR:

Mammalian target of rapamycin

MVD:

Microvessel density

OEC:

Outgrowth endothelial cell

RAD001:

Small molecule drug inhibiting mTOR

TAE226:

Small molecule drug inhibiting FAK

VEGF:

Vascular endothelial growth factor

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Acknowledgements

This research was supported by Novartis Pharma AG, Basel, Switzerland. A.S. receives a bursary of the Werner Otto Foundation for Researchers in Medical Science at the University of Hamburg.

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Correspondence to Walter Fiedler.

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Alexander Schultze and Sebastian Decker contributed equally

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Schultze, A., Decker, S., Otten, J. et al. TAE226-mediated inhibition of focal adhesion kinase interferes with tumor angiogenesis and vasculogenesis. Invest New Drugs 28, 825–833 (2010). https://doi.org/10.1007/s10637-009-9326-5

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