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• W2060278315 abstract "The overexpression of angiogenic factors such as vascular endothelial growth factor (VEGF), fibroblast growth factor (FGF) and insulin-like growth factors (IGFs) plays a role in the migration and proliferation of endothelial cells in many cancers. Consequently, we investigated the effects of bombesin/gastrin-releasing peptide (GRP) antagonists on the expression of these angiogenic factors, the activities of matrix metalloproteinases (MMPs)-2 and -9, as well as the vascular density in MDA-MB-435 human oestrogen-independent breast cancers. Nude mice bearing orthotopic xenografts of MDA-MB-435 breast cancers were treated with bombesin/GRP antagonists for 6 weeks. Daily administration of 20 microg of RC-3095 or 10 microg of RC-3940-II significantly decreased the weight of MDA-MB-435 cancers by 44 and 53%, respectively. The inhibition of tumour growth was associated with a substantial reduction in the expression of mRNA and protein levels of basic fibroblast growth factor (bFGF), IGF-II and VEGF-A in the tumours. Both bombesin/GRP antagonists significantly decreased the vessel density of the tumours by about 37%, as shown by immunohistochemical detection of vessels on tumour slides. Gelatinolytic activities, detected by zymography, revealed a 33-46% reduction in MMP-9 activity after the treatment with either antagonist. In vitro studies revealed that MDA-MB-435 cells secrete bFGF, IGF-II and VEGF-A, and the secretion of these factors is inhibited by RC-3095 and RC-3940-II. This study demonstrates the antiangiogenic effect of bombesin/GRP antagonists RC-3095 and RC-3940-II, and underscores their possible therapeutic application for treatment of breast cancers." @default.
• W2060278315 created "2016-06-24" @default.
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• W2060278315 date "2004-01-01" @default.
• W2060278315 modified "2023-10-18" @default.
• W2060278315 title "Bombesin antagonists inhibit proangiogenic factors in human experimental breast cancers" @default.
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• W2060278315 doi "https://doi.org/10.1038/sj.bjc.6601404" @default.
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