title: Cell surface receptor expression patterns in osteosarcoma.
abstract: BACKGROUND
  Although the presence of numerous cell signaling receptors in osteosarcoma is known, their simultaneous characterization has not been performed to date. The current study sought to characterize and quantify the expression of cell surface receptors across a variety of osteosarcoma cell lines.
  
  
  METHODS
  Standard (n = 4) and patient-derived (n = 10) osteosarcoma cell lines were cultured and labeled with antibodies to epidermal growth factor receptor, human epidermal growth factor receptor (HER)-2, HER-3, HER-4, insulin-like growth factor 1 receptor (IGF-1R), IGF-2R, insulin receptor (IR), vascular endothelial growth factor receptor (VEGFR)-1, VEGFR-2, VEGFR-3, c-Met, fibroblast growth factor receptor (FGFR)-2, FGFR-3, and platelet-derived growth factor receptor (PDGFR)-β. Cell surface examination was performed using flow cytometry, and the geometric fluorescent mean for each receptor was calculated and compared against a positive control.
  
  
  RESULTS
  Significant overexpression of IGF-2R was shown in all cell lines, with an average geometric mean above the upper expression quartile. A variable expression pattern was seen for c-Met, PDGFR-β, IR, IGFR-1, HER-2, and VEGFR-3 with expression values for the remaining receptors mainly in the lower quartile. An apparent association between the expression of IGF-1R and HER-2 and between the expression of PDGFR-β and IR was demonstrated.
  
  
  CONCLUSIONS
  IGF-2R was consistently overexpressed on the cell surface across all tested osteosarcoma cell lines. Substantial, although variable, expression of c-Met, HER-2, IGF-1R, VEGFR-3, IR, and PDGFR-β was demonstrated as well, suggesting that these receptors may contribute to osteosarcoma aggressiveness and biological heterogeneity and may serve as potential targets within a subset of tumors. Associated receptor expression may provide new insight into common regulatory factors or pathways. Targeting either common factors or targeting multiple specific receptors may have therapeutic relevance.
authors.affiliation: Department of Orthopaedic Surgery, Montefiore Medical Center and The Children's Hospital at Montefiore, Bronx, New York 10467, USA.
authors.forename: Sheref E
authors.initials: SE
authors.lastname: Hassan
authors.forename: Mikhail
authors.initials: M
authors.lastname: Bekarev
authors.forename: Mimi Y
authors.initials: MY
authors.lastname: Kim
authors.forename: Juan
authors.initials: J
authors.lastname: Lin
authors.forename: Sajida
authors.initials: S
authors.lastname: Piperdi
authors.forename: Richard
authors.initials: R
authors.lastname: Gorlick
authors.forename: David S
authors.initials: DS
authors.lastname: Geller
mesh_terms: D001859:Bone Neoplasms / Q000378:metabolism*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D005434:Flow Cytometry; D020869:Gene Expression Profiling; D006801:Humans; D012516:Osteosarcoma / Q000378:metabolism*; D010766:Phosphorylation; D019859:Proto-Oncogene Proteins c-met / Q000378:metabolism; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism; D017526:Receptor, IGF Type 1 / Q000378:metabolism; D011972:Receptor, Insulin / Q000378:metabolism; D020797:Receptor, Platelet-Derived Growth Factor beta / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism*; D015398:Signal Transduction; D040281:Vascular Endothelial Growth Factor Receptor-1 / Q000378:metabolism; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000378:metabolism; D040321:Vascular Endothelial Growth Factor Receptor-3 / Q000378:metabolism
chemical_list: D019859:Proto-Oncogene Proteins c-met; D018719:Erb-b2 Receptor Tyrosine Kinases; D017526:Receptor, IGF Type 1; D011972:Receptor, Insulin; D020797:Receptor, Platelet-Derived Growth Factor beta; D011956:Receptors, Cell Surface; D040281:Vascular Endothelial Growth Factor Receptor-1; D040301:Vascular Endothelial Growth Factor Receptor-2; D040321:Vascular Endothelial Growth Factor Receptor-3; C508053:ERBB2 protein, human