Estradiol-mediated tumor neo-vascularization

Rajoria,Shilpi; Suriano,Robert; Wilson,Yushan  L.; George,Andrea   L.; Geliebter,Jan; Schantz,Stimson  P.; Tiwari,Raj K.  K.

doi:10.3892/ol.2011.283

Estradiol-mediated tumor neo-vascularization

Authors:
- Shilpi Rajoria
- Robert Suriano
- Yushan L. Wilson
- Andrea L. George
- Jan Geliebter
- Stimson P. Schantz
- Raj K. K. Tiwari
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Affiliations: Department of Microbiology and Immunology, New York Medical College, Valhalla, NY 10595, USA, Department of Otolaryngology, New York Eye and Ear Infirmary, New York, NY 10003, USA
Published online on: March 21, 2011 https://doi.org/10.3892/ol.2011.283
Pages: 453-457

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Abstract

Neo-vascularization is essential for tumor growth and metastasis and is presumably initiated by bone marrow-derived endothelial progenitor cells (BM-EPCs). These cells predominantly reside in the bone marrow and are recruited at sites of inflammation, tissue damage and tumors. The tissue-specific factors responsible for recruitment of BM-EPCs and neo-vascularization are the subject of intense investigation. Using bone marrow cells from Tek/green fluorescent protein (GFP) transgenic mice, we analyzed the effect of estrogen on the mobilization of BM-EPCs to orthotopically implanted cancer cells in estrogen- and non-estrogen-supplemented ovariectomized mice. The donor marrow cells were unique as they were fluorescently tagged, allowing for the tracking of their migration to the tumor tissues. Results showed that GFP + BM-EPCs were incorporated within the tumor vasculature in comparison to the sham injections. Notably, estrogen supplementation enhanced the mobilization of BM-EPCs to the tumor site. This elevation shows that estrogen may affect tumor neo-vascularization by inducing the mobilization of BM-EPCs. Understanding and characterizing the mechanism involved in the estrogen-induced mobilization of BM-EPCs may serve as a ‘Trojan horse’ in the delivery of bio-molecules that may disrupt tumor vasculogenesis and induce the targeted killing of tumor cells.

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