CCL5 promotes VEGF-dependent angiogenesis by down-regulating miR-200b through PI3K/Akt signaling pathway in human chondrosarcoma cells

Oncotarget. 2014 Nov 15;5(21):10718-31. doi: 10.18632/oncotarget.2532.

Abstract

Chondrosarcoma is the second most common primary malignant bone cancer, with potential for local invasion and distant metastasis. Chemokine CCL5 (formerly RANTES) of the CC-chemokine family plays a crucial role in metastasis. Angiogenesis is essential for the cancer metastasis. However, correlation of CCL5 with vascular endothelial growth factor (VEGF) expression and angiogenesis in human chondrosarcoma is still unknown. CCL5-mediated VEGF expression was assessed by qPCR, ELISA, and Western blotting. CCL5-induced angiogenesis was examined by migration and tube formation in endothelial progenitor cells in vitro. CCL5 increased VEGF expression and also promoted chondrosarcoma conditional medium-mediated angiogenesis in vitro and in vivo. Stimulation of chondrosarcoma with CCL5 augmented PI3K and Akt phosphorylation, while PI3K and Akt inhibitor or siRNA abolished CCL5-induced VEGF expression and angiogenesis. We also demonstrated CCL5 inhibiting miR-200b expression and miR-200b mimic reversing the CCL5-enhanced VEGF expression and angiogenesis. Moreover, in chondrosarcoma patients showed the positive correlation between CCL5 and VEGF; negative correlation between CCL5 and miR-200b. Taken together, results demonstrate CCL5 promoting VEGF-dependent angiogenesis in human chondrosarcoma cells by down-regulating miR-200b through PI3K/Akt signaling pathway.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis
  • Blotting, Western
  • Bone Neoplasms / blood supply*
  • Bone Neoplasms / metabolism
  • Bone Neoplasms / pathology
  • Cell Movement
  • Cell Proliferation
  • Cells, Cultured
  • Chemokine CCL5 / genetics
  • Chemokine CCL5 / metabolism*
  • Chick Embryo
  • Chondrosarcoma / blood supply*
  • Chondrosarcoma / metabolism
  • Chondrosarcoma / pathology
  • Chorioallantoic Membrane
  • Down-Regulation
  • Endothelial Progenitor Cells / metabolism
  • Enzyme-Linked Immunosorbent Assay
  • Humans
  • Male
  • Mice
  • Mice, Nude
  • MicroRNAs / genetics*
  • Neovascularization, Pathologic*
  • Phosphatidylinositol 3-Kinases / genetics
  • Phosphatidylinositol 3-Kinases / metabolism*
  • Phosphorylation
  • Proto-Oncogene Proteins c-akt / genetics
  • Proto-Oncogene Proteins c-akt / metabolism*
  • RNA, Messenger / genetics
  • Real-Time Polymerase Chain Reaction
  • Reverse Transcriptase Polymerase Chain Reaction
  • Signal Transduction
  • Vascular Endothelial Growth Factor A / genetics
  • Vascular Endothelial Growth Factor A / metabolism*
  • Xenograft Model Antitumor Assays

Substances

  • CCL5 protein, human
  • Chemokine CCL5
  • MIRN200 microRNA, human
  • MicroRNAs
  • RNA, Messenger
  • VEGFA protein, human
  • Vascular Endothelial Growth Factor A
  • Phosphatidylinositol 3-Kinases
  • Proto-Oncogene Proteins c-akt