Phytochemicals as Dual Inhibitors of Tumor Angiogenesis and Metastasis Overlapping Molecular Mechanisms

Abstract

The dual anti-angiogenic and anti-metastatic effects of phytochemicals, focusing on the overlapping molecular mechanisms that concurrently restrict tumor blood supply and suppress the metastatic cascade. Our central hypothesis posits that specific phytochemical classes, including polyphenols, terpenoids, and marine-derived sulfated polysaccharides, inhibit both angiogenesis and metastasis by targeting shared signaling pathways such as VEGF/VEGFR2, HIF-1alpha, NF-kappaB, STAT3, and MMP-2/MMP-9. The synthesis revealed that curcumin, resveratrol, epigallocatechin-3-gallate, genistein, and quercetin were the most extensively studied compounds. Curcumin suppressed VEGF/VEGFR2 signaling and reduced microvessel density in xenograft models, while resveratrol decreased VEGF and HIF-1alpha expression, inhibiting endothelial adhesion and migration by 50 to 60 percent. Furthermore, curcumin downregulated NF-kappaB, MMP-9, and COX-2, thereby reducing lung metastasis in breast cancer xenografts. Resveratrol similarly reduced metastatic burden through MMP-2 suppression in osteosarcoma models. Quantitative findings demonstrated potent effects, with curcumin suppressing MMP-2 activity by up to 86 percent in a lymphoma-bearing mouse model. The contribution of this work lies in systematically demonstrating that phytochemicals act as dual inhibitors of angiogenesis and metastasis through convergent molecular targets. Hence, these findings support the potential of phytochemicals as promising candidates for adjuvant cancer therapy, though further translational research is warranted to validate these effects in clinical settings.