title: The selective class III/V receptor tyrosine kinase inhibitor SU11657 inhibits tumor growth and angiogenesis in experimental neuroblastomas grown in mice.
abstract: Vascular endothelial growth factor (VEGF), fibroblast growth factor (FGF), and platelet-derived growth factor (PDGF) and their cognate receptor tyrosine kinases are strongly implicated in angiogenesis associated with solid tumors. SU11657 (SUGEN) is a selective multitargeted tyrosine kinase inhibitor with antitumor and antiangiogenic activity exerted by targeting PDGF receptors (PDGFR), VEGF receptors (VEGFR), stem cell factor receptor (c-KIT), and FMS-related tyrosine kinase 3. Oral administration of SU11657 at 40 mg x kg(-1) x d(-1) to athymic mice resulted in significant growth inhibition of a panel of s.c. human neuroblastoma xenografts, namely, fast-growing SK-N-AS, MYCN- amplified IMR-32, and SH-SY5Y, by 90, 93.8, and 88%, respectively, and was well tolerated. All of the cell lines expressed VEGFR-2, PDGFR-beta, and c-KIT protein in the tumor cell and endothelial cell compartment by immunohistochemistry, and the expression decreased during therapy. Plasma concentrations of VEGF-A, PDGF-BB, and stem cell factor increased per milliliter of tumor volume at days 10, 18, and 20 of therapy. Furthermore, SU11657 reduced tumor angiogenesis by 63-96%. Our experimental data suggest that the angiogenesis inhibitor SU11657 may be beneficial in the treatment of rapidly growing and highly vascularized solid tumors of childhood, such as neuroblastoma. In summary, the class III/V receptor tyrosine kinases and their ligands are implicated in angiogenesis, tumor cell proliferation, and cell survival, and it seems reasonable to determine whether interference with these pathways can suppress neuroblastoma growth or not.
authors.affiliation: Department of Medical Cell Biology, Uppsala University, SE-751 23, Uppsala Sweden. Ulrika.Backman@medcellbiol.uu.se
authors.forename: Ulrika
authors.initials: U
authors.lastname: Bäckman
authors.forename: Rolf
authors.initials: R
authors.lastname: Christofferson
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis; D000077214:Becaplermin; D002454:Cell Differentiation; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002470:Cell Survival; D004305:Dose-Response Relationship, Drug; D004730:Endothelium, Vascular / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D004797:Enzyme-Linked Immunosorbent Assay; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009389:Neovascularization, Pathologic; D009447:Neuroblastoma / Q000098:blood supply* / Q000188:drug therapy*; D009930:Organic Chemicals / Q000494:pharmacology*; D010982:Platelet-Derived Growth Factor / Q000378:metabolism; D019009:Proto-Oncogene Proteins c-kit / Q000378:metabolism; D020574:Proto-Oncogene Proteins c-sis; D020794:Receptor Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D020797:Receptor, Platelet-Derived Growth Factor beta / Q000378:metabolism; D019089:Stem Cell Factor / Q000378:metabolism; D013997:Time Factors; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D004791:Enzyme Inhibitors; D009930:Organic Chemicals; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; C474557:SU 11657; D019089:Stem Cell Factor; D042461:Vascular Endothelial Growth Factor A; D000077214:Becaplermin; D019009:Proto-Oncogene Proteins c-kit; D020794:Receptor Protein-Tyrosine Kinases; D020797:Receptor, Platelet-Derived Growth Factor beta; D040301:Vascular Endothelial Growth Factor Receptor-2