6533b839fe1ef96bd12a5adc

RESEARCH PRODUCT

Carboxyamidotriazole-Orotate Inhibits the Growth of Imatinib-Resistant Chronic Myeloid Leukaemia Cells and Modulates Exosomes-Stimulated Angiogenesis

A. FlugyStefania RaimondoGiuliana GugginoGiacomo De LeoChiara CorradoRiccardo AlessandroRashida KarmaliSimona Taverna

subject

MaleResearch ValidityPhysiologyAngiogenesisTumor PhysiologyFusion Proteins bcr-ablCancer Treatmentlcsh:MedicinePharmacologyExosomesCardiovascular PhysiologyBiochemistryPiperazinesHematologic Cancers and Related DisordersMicechemistry.chemical_compoundCell Movementhemic and lymphatic diseasesMolecular Cell BiologyBasic Cancer ResearchMedicine and Health SciencesPhosphorylationPost-Translational ModificationExtracellular Signal-Regulated MAP Kinaseslcsh:ScienceChronic Myelogenous LeukemiaMultidisciplinaryABLNeovascularization PathologicGene Expression Regulation LeukemicChemistryHematologyResearch AssessmentOncologyBenzamidesImatinib MesylateMedicineOncology AgentsAntiangiogenesis Therapymedicine.drugResearch ArticleChronic Myeloid LeukemiaAntineoplastic AgentsResearch and Analysis MethodsCell GrowthCell Line TumorLeukemia Myelogenous Chronic BCR-ABL PositiveLeukemiasCell AdhesionHuman Umbilical Vein Endothelial CellsmedicineAnimalsHumansRNA MessengerPhosphotyrosineBiologyCell ProliferationOrotic AcidTumor microenvironmentCarboxyamidotriazoleInterleukin-8lcsh:RBiology and Life SciencesProteinsCancers and NeoplasmsImatinibTriazolesmedicine.diseaseXenograft Model Antitumor AssaysRetractionExosomePyrimidinesImatinib mesylateDrug Resistance NeoplasmCarboxyamidotriazole Orotatelcsh:QAngiogenesisCell Adhesion MoleculesProto-Oncogene Proteins c-aktDevelopmental BiologyChronic myelogenous leukemia

description

The Bcr/Abl kinase has been targeted for the treatment of chronic myelogenous leukaemia (CML) by imatinib mesylate. While imatinib has been extremely effective for chronic phase CML, blast crisis CML are often resistant. New therapeutic options are therefore needed for this fatal disease. Although more common in solid tumors, increased microvessel density was also reported in chronic myelogenous leukaemia and was associated with a significant increase of angiogenic factors, suggesting that vascularity in hematologic malignancies is a controlled process and may play a role in the leukaemogenic process thus representing an alternative therapeutic target. Carboxyamidotriazole-orotate (CTO) is the orotate salt form of carboxyamidotriazole (CAI), an orally bioavailable signal transduction inhibitor that in vitro has been shown to possess antileukaemic activities. CTO, which has a reduced toxicity, increased oral bioavailability and stronger efficacy when compared to the parental compound, was tested in this study for its ability to affect imatinib-resistant CML tumor growth in a xenograft model. The active cross talk between endothelial cells and leukemic cells in the bone marrow involving exosomes plays an important role in modulating the process of neovascularization in CML. We have thus investigated the effects of CTO on exosome-stimulated angiogenesis. Our results indicate that CTO may be effective in targeting both cancer cell growth and the tumor microenvironment, thus suggesting a potential therapeutic utility for CTO in leukaemia patients.

10.1371/journal.pone.0042310http://europepmc.org/articles/PMC3411738?pdf=render