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Intracrine VEGF signalling mediates colorectal cancer cell migration and invasion
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Journal Article
Intracrine VEGF signalling mediates colorectal cancer cell migration and invasion
2017
Overview
Background:
Vascular endothelial growth factor (VEGF) and its receptors (VEGFRs) are key regulators of angiogenesis, affecting endothelial cell survival and function. However, the effect of VEGF-VEGFR signalling on tumour cell function is not well understood. Our previous studies in colorectal cancer (CRC) cells have demonstrated an intracrine VEGF/VEGFR1 signalling mechanism that mediates CRC cell survival and chemo-sensitivity. Since extracellular VEGF signalling regulates migration of endothelial cells and various tumour cells, we attempted to determine whether intracrine VEGF signalling affects CRC cell motility.
Methods:
Migration and invasion of CRC cells, with and without VEGF or VEGFR1 depletion, were assayed using transwell migration chambers. Changes in cell morphology, epithelial-mesenchymal transition (EMT) markers, and markers of cell motility were assessed by immunostaining and western blot.
Results:
Depletion of intracellular VEGF and VEGFR1 in multiple CRC cell lines led to strong inhibition of migration and invasion of CRC cells. Except for Twist, there were no significant differences in markers of EMT between control and VEGF/VEGFR1-depleted CRC cells. However, VEGF/VEGFR1-depleted CRC cells demonstrated a significant reduction in levels of phosphorylated focal adhesion kinase and its upstream regulators pcMET and pEGFR.
Conclusions:
Inhibition of intracrine VEGF signalling strongly inhibits CRC cell migration and invasion by regulating proteins involved in cell motility.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Biomedical and Life Sciences
/ Colorectal Neoplasms - metabolism
/ Colorectal Neoplasms - pathology
/ Cytology
/ Epithelial-Mesenchymal Transition - physiology
/ Humans
/ Motility
/ Neoplasm Proteins - deficiency
/ Neoplasm Proteins - genetics
/ Neoplasm Proteins - metabolism
/ Oncology
/ Proto-Oncogene Proteins c-met - metabolism
/ RNA, Small Interfering - genetics
/ Survival
/ Tumors
/ Vascular endothelial growth factor
/ Vascular Endothelial Growth Factor A - deficiency
/ Vascular Endothelial Growth Factor A - genetics
/ Vascular Endothelial Growth Factor A - metabolism
/ Vascular Endothelial Growth Factor Receptor-1 - deficiency
/ Vascular Endothelial Growth Factor Receptor-1 - genetics
/ Vascular Endothelial Growth Factor Receptor-1 - metabolism
