title: Stromal cell-derived factor-1 increase alphavbeta3 integrin expression and invasion in human chondrosarcoma cells.
abstract: Chondrosarcoma is a type of highly malignant tumor with a potent capacity to invade locally and cause distant metastasis. Chondrosarcoma shows a predilection for metastasis to the lungs. The stromal cell-derived factor 1 (SDF-1), constitutively secreted by human lung epithelium cells, has been shown to function in a key role for recruitment of neutrophils. Here, we found that human chondrosarcoma tissues and chondrosarcoma cell lines had significant expression of CXCR4 (SDF-1 receptor), which was higher than normal cartilage and human chondrocyte. SDF-1alpha and lung epithelium cells conditioned medium (LECM) induced the invasiveness of chondrosarcoma cells. SDF-1 siRNA inhibited LECM-induced invasion of chondrosarcoma cells and SDF-1alpha also directly induced the cell surface expression of alphavbeta3 but not alpha2beta1 and alpha5beta1 integrin. Activations of ERK and NF-kappaB pathways after SDF-1 treatment was demonstrated, and SDF-1alpha-induced expression of alphavbeta3 integrin and invasion activity was inhibited by the specific inhibitor and mutant of ERK and NF-kappaB cascades. Taken together, our results indicate that lung derived-SDF-1alpha enhances the invasiveness of chondrosarcoma cells by increasing alphavbeta3 integrin expression through the CXCR4/ERK/NF-kappaB signal transduction pathway.
authors.affiliation: Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan.
authors.forename: Tzu-Hsiu
authors.initials: TH
authors.lastname: Lai
authors.forename: Yi-Chin
authors.initials: YC
authors.lastname: Fong
authors.forename: Wen-Mei
authors.initials: WM
authors.lastname: Fu
authors.forename: Rong-Sen
authors.initials: RS
authors.lastname: Yang
authors.forename: Chih-Hsin
authors.initials: CH
authors.lastname: Tang
mesh_terms: D045744:Cell Line, Tumor; D054377:Chemokine CXCL12 / Q000494:pharmacology*; D002813:Chondrosarcoma / Q000201:enzymology / Q000378:metabolism* / Q000473:pathology*; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D039302:Integrin alphaVbeta3 / Q000235:genetics / Q000378:metabolism*; D008954:Models, Biological; D016328:NF-kappa B / Q000378:metabolism; D009361:Neoplasm Invasiveness; D019718:Receptors, CXCR4 / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D054377:Chemokine CXCL12; D039302:Integrin alphaVbeta3; D016328:NF-kappa B; D019718:Receptors, CXCR4; D048049:Extracellular Signal-Regulated MAP Kinases