1. CXCL5 induces tumor angiogenesis via enhancing the expression of FOXD1 mediated by the AKT/NF-κB pathway in colorectal cancer.
- Author
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Chen C, Xu ZQ, Zong YP, Ou BC, Shen XH, Feng H, Zheng MH, Zhao JK, and Lu AG
- Subjects
- Animals, Cell Movement drug effects, Cell Proliferation drug effects, Chemokine CXCL5 genetics, Colorectal Neoplasms blood supply, Colorectal Neoplasms genetics, Forkhead Transcription Factors genetics, Human Umbilical Vein Endothelial Cells, Humans, Mice, Mice, Inbred BALB C, Mice, Nude, NF-kappa B genetics, Oligonucleotide Array Sequence Analysis, Platelet Endothelial Cell Adhesion Molecule-1 metabolism, Proto-Oncogene Proteins c-akt genetics, RNA, Small Interfering metabolism, Receptors, Interleukin-8B genetics, Receptors, Interleukin-8B metabolism, Recombinant Proteins genetics, Recombinant Proteins metabolism, Signal Transduction genetics, Transplantation, Heterologous, Up-Regulation, Vascular Endothelial Growth Factor A genetics, Vascular Endothelial Growth Factor A metabolism, Chemokine CXCL5 metabolism, Colorectal Neoplasms metabolism, Forkhead Transcription Factors metabolism, NF-kappa B metabolism, Neovascularization, Pathologic metabolism, Proto-Oncogene Proteins c-akt metabolism
- Abstract
The mechanisms underlying the role of CXCL5 in tumor angiogenesis have not been fully defined. Here, we examined the effect of CXCL5 on tumor angiogenesis in colorectal cancer (CRC). Immunohistochemistry was used to monitor the expression of CXCL5 and CD31 in CRC patients' tissues. HUVEC cell lines stably transfected with shCXCR2 and shFOXD1 lentivirus plasmids were used in an in vitro study. Based on some molecular biological experiments in vitro and in vivo, we found that CXCL5 was upregulated in tumor tissues and that its level positively correlated with the expression of CD31. Next, we used recombinant human CXCL5 (rhCXCL5) to stimulate HUVECs and found that their tube formation ability, proliferation, and migration were enhanced by the activation of the AKT/NF-κB/FOXD1/VEGF-A pathway in a CXCR2-dependent manner. However, silencing of CXCR2 and FOXD1 or inhibition of the AKT and NF-κB pathways could attenuate the tube formation ability, proliferation, and migration of rhCXCL5-stimulated HUVECs in vitro. rhCXCL5 can promote angiogenesis in vivo in Matrigel plugs, and the overexpression of CXCL5 can also increase microvessel density in vivo in a subcutaneous xenotransplanted tumor model in nude mice. Taken together, our findings support CXCL5 as an angiogenic factor that can promote cell metastasis through tumor angiogenesis in CRC. Furthermore, we propose that FOXD1 is a novel regulator of VEGF-A. These observations open new avenues for therapeutic application of CXCL5 in tumor anti-angiogenesis.
- Published
- 2019
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