Twist Overexpression Induces In vivo Angiogenesis and Correlates with Chromosomal Instability in Breast Cancer

Cancer Research - Tập 65 Số 23 - Trang 10801-10809 - 2005
Yelena Mironchik1, Paul T. Winnard1, Farhad Vesuna1, Yoshinori Katō1, Flonné Wildes1, Arvind P. Pathak1, Scott L. Kominsky2, Dmitri Artemov1, Zaver M. Bhujwalla1, Paul van Diest3, Horst Bürger4, Carlotta A. Glackin5, Venu Raman1
11Radiology and Departments of
22Orthopedic Surgery, Johns Hopkins University, School of Medicine, Baltimore, Maryland;
33Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands;
44Institute of Pathology, University of Munster, Munster, Germany; and
55Division of Molecular Medicine, Beckman Research Institute, City of Hope, Duarte, California

Tóm tắt

Abstract Aggressive cancer phenotypes are a manifestation of many different genetic alterations that promote rapid proliferation and metastasis. In this study, we show that stable overexpression of Twist in a breast cancer cell line, MCF-7, altered its morphology to a fibroblastic-like phenotype, which exhibited protein markers representative of a mesenchymal transformation. In addition, it was observed that MCF-7/Twist cells had increased vascular endothelial growth factor (VEGF) synthesis when compared with empty vector control cells. The functional changes induced by VEGF in vivo were analyzed by functional magnetic resonance imaging (MRI) of MCF-7/Twist-xenografted tumors. MRI showed that MCF-7/Twist tumors exhibited higher vascular volume and vascular permeability in vivo than the MCF-7/vector control xenografts. Moreover, elevated expression of Twist in breast tumor samples obtained from patients correlated strongly with high-grade invasive carcinomas and with chromosome instability, particularly gains of chromosomes 1 and 7. Taken together, these results show that Twist overexpression in breast cancer cells can induce angiogenesis, correlates with chromosomal instability, and promotes an epithelial-mesenchymal-like transition that is pivotal for the transformation into an aggressive breast cancer phenotype.

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