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RESEARCH PRODUCT

Differentiative pathway activated by 3-aminobenzamide, an inhibitor of PARP, in human osteosarcoma MG-63 cells

Concetta Maria MessinaAndrea SantulliE. Di LeonardoAntonella D'anneoGiovanni TesoriereV. ManganoA. De BlasioRenza Vento

subject

Blotting WesternBiophysicsHyperphosphorylationCell Cycle ProteinsPoly(ADP-ribose) Polymerase InhibitorsCell cycleRetinoblastoma ProteinBiochemistryPARPRb proteinCyclin D1Downregulation and upregulationStructural BiologyCell Line TumorGene expressionGeneticsHumansImmunoprecipitationOsteopontinEnzyme InhibitorsPhosphorylationE2FMolecular BiologyDNA PrimersAdenosine Diphosphate RiboseOsteosarcomaBase SequencebiologyReverse Transcriptase Polymerase Chain ReactionG1 PhaseCell DifferentiationCell BiologyCell cycleFlow Cytometry3-ABE2F Transcription FactorsChromatinDNA-Binding ProteinsGene Expression RegulationDifferentiationBenzamidesbiology.proteinCancer researchTranscription Factors

description

AbstractThis study describes the molecular mechanism by which treatment with 3-AB, a potent inhibitor of PARP, allows human osteosarcoma MG-63 cells to restrict growth and enter differentiation. Our findings show that in MG-63 cells, aberrant gene expression keeps Rb protein constitutively inactivated through hyperphosphorylation and this promotes uncontrolled proliferation of the cells. After 3-AB-treatment, the poly(ADP-ribosyl)ation of nuclear proteins markedly decreases and this results in an increase in both the hypophosphorylated active form of Rb and pRb/E2F complexes. These effects are accompanied by G1 arrest, downregulation of gene products required for proliferation (cyclin D1, β-catenin, c-Jun, c-Myc and Id2) and upregulation of those implicated in the osteoblastic differentiation (p21/Waf1, osteopontin, osteocalcin, type I collagen, N-cadherins and alkaline phosphatase). Our study suggests that use of PARP inhibitors may induce a remodeling of chromatin with the reprogramming of gene expression and the activation of differentiation.

yearjournalcountryeditionlanguage
2004-10-28FEBS Letters
https://doi.org/10.1016/j.febslet.2004.12.028