Blocking 伪v尾3 integrin by a recombinant RGD disintegrin impairs VEGF signaling in endothelial cells

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• 作者：Cyntia F. Montenegro^a ; ¹ ; Carmen L. Salla-Pontes^a ; ¹ ; Juliana U. Ribeiro^a ; ¹ ; Aline Z. Machado^a ; Rafael F. Ramos^a ; Camila C. Figueiredo^b ; Verô ; nica Morandi^b ; Heloisa S. Selistre-de-Araujo^a ; ^{hsaraujo@ufscar.br}
• 关键词：Disintegrin ; Integrin ; VEGF ; VEGFR ; Cell adhesion ; MMP ; Tumor microenvironment
• 刊名：Biochimie
• 出版年：2012
• 期刊代码：24_03009084
• 类别：bio
• 出版时间：August, 2012
• 卷：94
• 期：8
• 页码：1812-1820
• 文件大小：906 K

摘要

Vascular endothelial growth factor (VEGF) and 伪v尾3 integrin are key molecules that actively participate in tumor angiogenesis and metastasis. Some integrin-blocking molecules are currently under clinical trials for cancer and metastasis treatment. However, the mechanism of action of such inhibitors is not completely understood. We have previously demonstrated the anti-angiogenic and anti-metastatic properties of DisBa-01, a recombinant His-tag RGD-disintegrin from Bothrops alternatus snake venom in some experimental models. DisBa-01 blocks 伪v尾3 integrin binding to vitronectin and inhibits integrin-mediated downstream signaling cascades and cell migration. Here we add some new information on the mechanism of action of DisBa-01 in the tumor microenvironment. DisBa-01 supports the adhesion of fibroblasts and MDA-MB-231 breast cancer cells but it inhibits the adhesion of these cells to type I collagen under flow in high shear conditions, as a simulation of the blood stream. DisBa-01 does not affect the release of VEGF by fibroblasts or breast cancer cells but it strongly decreases the expression of VEGF mRNA and of its receptors, vascular endothelial growth factor receptors 1 and 2 (VEGFR1 and VEGFR2) in endothelial cells. DisBa-01 at nanomolar concentrations also modulates metalloprotease 2 (MMP-2) and 9 (MMP-9) activity, the latter being decreased in fibroblasts and increased in MDA-MB-231 cells. In conclusion, these results demonstrate that 伪v尾3 integrin inhibitors may induce distinct effects in the cells of the tumor microenvironment, resulting in blockade of angiogenesis by impairing of VEGF signaling and in inhibition of tumor cell motility.