title: SB-431542, a small molecule transforming growth factor-beta-receptor antagonist, inhibits human glioma cell line proliferation and motility.
abstract: Transforming growth factor-beta (TGF-beta) is a multifunctional cytokine that promotes malignant glioma invasion, angiogenesis, and immunosuppression. Antisense oligonucleotide suppression of TGF-beta(2) ligand expression has shown promise in preclinical and clinical studies but at least two ligands mediate the effects of TGF-beta in gliomas. Therefore, we examined the effects of SB-431542, a novel, small molecule inhibitor of the type I TGF-beta receptor, on a panel of human malignant glioma cell lines. SB-431542 blocked the phosphorylation and nuclear translocation of the SMADs, intracellular mediators of TGF-beta signaling, with decreased TGF-beta-mediated transcription. Furthermore, SB-431542 inhibited the expression of two critical effectors of TGF-beta-vascular endothelial growth factor and plasminogen activator inhibitor-1. SB-431542 treatment of glioma cultures inhibited proliferation, TGF-beta-mediated morphologic changes, and cellular motility. Together, our results suggest that small molecule inhibitors of TGF-beta receptors may offer a novel therapy for malignant gliomas by reducing cell proliferation, angiogenesis, and motility.
authors.affiliation: Division of Neurology, Duke University Medical Center, P.O. Box 2900, Durham, NC 27710, USA.
authors.forename: Mark D
authors.initials: MD
authors.lastname: Hjelmeland
authors.forename: Anita B
authors.initials: AB
authors.lastname: Hjelmeland
authors.forename: Sith
authors.initials: S
authors.lastname: Sathornsumetee
authors.forename: Elizabeth D
authors.initials: ED
authors.lastname: Reese
authors.forename: Michael H
authors.initials: MH
authors.lastname: Herbstreith
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Laping
authors.forename: Henry S
authors.initials: HS
authors.lastname: Friedman
authors.forename: Darell D
authors.initials: DD
authors.lastname: Bigner
authors.forename: Xiao-Fan
authors.initials: XF
authors.lastname: Wang
authors.forename: Jeremy N
authors.initials: JN
authors.lastname: Rich
mesh_terms: D021581:Active Transport, Cell Nucleus / Q000187:drug effects; D030201:Activin Receptors, Type I / Q000037:antagonists & inhibitors* / Q000378:metabolism; D001549:Benzamides / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D004268:DNA-Binding Proteins / Q000378:metabolism; D004149:Dioxoles / Q000494:pharmacology*; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D005910:Glioma / Q000188:drug therapy / Q000473:pathology*; D006801:Humans; D010766:Phosphorylation / Q000187:drug effects; D017346:Protein Serine-Threonine Kinases; D000077293:Receptor, Transforming Growth Factor-beta Type I; D018125:Receptors, Transforming Growth Factor beta / Q000037:antagonists & inhibitors* / Q000378:metabolism; D051785:Smad Proteins; D015534:Trans-Activators / Q000378:metabolism; D014158:Transcription, Genetic / Q000187:drug effects; D016212:Transforming Growth Factor beta / Q000037:antagonists & inhibitors / Q000494:pharmacology
chemical_list: C459179:4-(5-benzo(1,3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamide; D001549:Benzamides; D004268:DNA-Binding Proteins; D004149:Dioxoles; D018125:Receptors, Transforming Growth Factor beta; D051785:Smad Proteins; D015534:Trans-Activators; D016212:Transforming Growth Factor beta; D017346:Protein Serine-Threonine Kinases; D030201:Activin Receptors, Type I; D000077293:Receptor, Transforming Growth Factor-beta Type I