title: 15-Deoxy-delta 12,14-prostaglandin J2 induces apoptosis in human malignant B cells: an effect associated with inhibition of NF-kappa B activity and down-regulation of antiapoptotic proteins.
abstract: Cyclopentenone prostaglandins are potent inhibitors of nuclear factor-kappa B (NF-kappa B), a transcription factor with a critical role in promoting inflammation and connected with multiple aspects of oncogenesis and cancer cell survival. In the present report, we investigated the role of NF-kappa B in the antineoplastic activity of the cyclopentenone prostaglandin 15-deoxy-Delta(12,14)-PGJ(2) (15d-PGJ(2)) in multiple myeloma (MM) and Burkitt lymphoma (BL) cells expressing constitutively active NF-kappa B. 15d-PGJ(2) was found to suppress constitutive NF-kappa B activity and potently induce apoptosis in both types of B-cell malignancies. 15d-PGJ(2)-induced apoptosis occurs through multiple caspase activation pathways involving caspase-8 and caspase-9, and is prevented by pretreatment with the pan-caspase inhibitor ZVAD (z-Val-Ala-Asp). NF-kappa B inhibition is accompanied by rapid down-regulation of NF-kappa B-dependent antiapoptotic gene products, including cellular inhibitor-of-apoptosis protein 1 (cIAP-1), cIAP-2, X-chromosome-linked inhibitor-of-apoptosis protein (XIAP), and FLICE-inhibitory protein (cFLIP). These effects were mimicked by the proteasome inhibitor MG-132, but not by the peroxisome proliferator-activated receptor-gamma (PPAR-gamma) agonist troglitazone, suggesting that 15d-PGJ(2)-induced apoptosis is independent of PPAR-gamma. Knockdown of the NF-kappa B p65-subunit by lentiviral-mediated shRNA interference also resulted in apoptosis induction in malignant B cells with constitutively active NF-kappa B. The results indicate that inhibition of NF-kappa B plays a major role in the proapoptotic activity of 15d-PGJ(2) in aggressive B-cell malignancies characterized by aberrant regulation of NF-kappa B.
authors.affiliation: Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Piva
authors.forename: Patrizia
authors.initials: P
authors.lastname: Gianferretti
authors.forename: Alessandra
authors.initials: A
authors.lastname: Ciucci
authors.forename: Riccardo
authors.initials: R
authors.lastname: Taulli
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Belardo
authors.forename: M Gabriella
authors.initials: MG
authors.lastname: Santoro
mesh_terms: D017209:Apoptosis / Q000502:physiology*; D016175:B-Lymphocyte Subsets / Q000473:pathology*; D002051:Burkitt Lymphoma / Q000378:metabolism / Q000473:pathology; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; D020169:Caspases / Q000378:metabolism; D002460:Cell Line; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000096:biosynthesis; D015536:Down-Regulation / Q000502:physiology*; D004789:Enzyme Activation / Q000187:drug effects; D006131:Growth Inhibitors / Q000494:pharmacology; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins; D047908:Intracellular Signaling Peptides and Proteins / Q000037:antagonists & inhibitors* / Q000378:metabolism; D020014:K562 Cells; D009101:Multiple Myeloma / Q000378:metabolism / Q000473:pathology; D016328:NF-kappa B / Q000037:antagonists & inhibitors* / Q000502:physiology; D015230:Prostaglandin D2 / Q000031:analogs & derivatives* / Q000494:pharmacology*; D011506:Proteins / Q000037:antagonists & inhibitors* / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D051636:X-Linked Inhibitor of Apoptosis Protein; D051020:bcl-X Protein
chemical_list: C097240:15-deoxy-delta(12,14)-prostaglandin J2; C494811:BCL2L1 protein, human; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; C506386:CFLAR protein, human; D004268:DNA-Binding Proteins; D006131:Growth Inhibitors; D051034:Inhibitor of Apoptosis Proteins; D047908:Intracellular Signaling Peptides and Proteins; D016328:NF-kappa B; D011506:Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D051636:X-Linked Inhibitor of Apoptosis Protein; C496866:XIAP protein, human; D051020:bcl-X Protein; D020169:Caspases; D015230:Prostaglandin D2