title: Antitumor activity of pyridoisoquinoline derivatives F91873 and F91874, novel multikinase inhibitors with activity against the anaplastic lymphoma kinase.
abstract: The anaplastic lymphoma kinase (ALK) is a validated target for the therapy of different malignancies. Aberrant expression of constitutively active ALK chimeric proteins has been implicated in the pathogenesis of anaplastic large-cell lymphoma (ALCL) and has been detected in other cancers such as inflammatory myofibroblastic tumors, diffuse large B-cell lymphomas, certain non-small-cell lung cancers, rhabdomyosarcomas, neuroblastomas and glioblastomas. In the course of a screening program aimed at identifying kinase inhibitors with novel scaffolds, the two pyridoisoquinoline derivatives F91873 and F91874, were identified as multikinase inhibitors with activity against ALK in a biochemical screen. F91873 and F91874 also inhibited nucleophosmin-ALK and signal transducer and activator of transcription 3 phosphorylation in the ALCL cell line COST with the same potency. Both F91873 and F91874 behaved as ATP noncompetitive inhibitors and inhibited cell proliferation of the ALK(+) ALCL cell lines COST, PIO, and Karpas299 ALCL. This growth inhibition effect was associated with a G1-phase cell cycle arrest. Furthermore, administration of F91874 to severe combined immunodeficient mice bearing COST tumor xenografts resulted in a significant antitumor efficacy at 15 mg/kg/day, illustrating the potential utility of such compounds in the treatment of ALK-related pathologies.
authors.affiliation: Centre de Recherche en Oncologie Expérimentale, Institut de Recherche Pierre Fabre, Toulouse Cedex 4, France. anna.kruczynski@pierre-fabre.com
authors.forename: Anna
authors.initials: A
authors.lastname: Kruczynski
authors.forename: Patrice
authors.initials: P
authors.lastname: Mayer
authors.forename: Arnaud
authors.initials: A
authors.lastname: Marchand
authors.forename: Stéphane
authors.initials: S
authors.lastname: Vispé
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Fournier
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Annereau
authors.forename: Viviane
authors.initials: V
authors.lastname: Brel
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Barret
authors.forename: Georges
authors.initials: G
authors.lastname: Delsol
authors.forename: Thierry
authors.initials: T
authors.lastname: Imbert
authors.forename: Jacques
authors.initials: J
authors.lastname: Fahy
authors.forename: Christian
authors.initials: C
authors.lastname: Bailly