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Xu L, Zeng Z, Zhang W, Ren G, Ling X, Huang F, Xie P, Su Y, Zhang XK, Zhou H. RXRα ligand Z-10 induces PML-RARα cleavage and APL cell apoptosis through disrupting PML-RARα/RXRα complex in a cAMP-independent manner. Oncotarget 2017; 8:12311-12322. [PMID: 28129653 PMCID: PMC5355346 DOI: 10.18632/oncotarget.14812] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 12/27/2016] [Indexed: 01/25/2023] Open
Abstract
The major oncogenic driver of acute promyelocytic leukemia (APL) is the fusion protein PML-RARα originated from the chromosomal translocation t(15;17). All-trans retinoic acid (ATRA) and arsenic trioxide cure most patients by directly targeting PML-RARα. However, major issues including the resistance of ATRA and arsenic therapy still remain in APL clinical management. Here we showed that compound Z-10, a nitro-ligand of retinoid X receptor α (RXRα), strongly promoted the cAMP-independent apoptosis of both ATRA- sensitive and resistant NB4 cells via the induction of caspase-mediated PML-RARα degradation. RXRα was vital for the stability of both PML-RARα and RARα likely through the interactions. The binding of Z-10 to RXRα dramatically inhibited the interaction of RXRα with PML-RARα but not with RARα, leading to Z-10's selective induction of PML-RARα but not RARα degradation. Z-36 and Z-38, two derivatives of Z-10, had improved potency of inducing PML-RARα reduction and NB4 cell apoptosis. Hence, RXRα ligand Z-10 and its derivatives could target both ATRA- sensitive and resistant APL cells through their distinct acting mechanism, and are potential drug leads for APL treatment.
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Affiliation(s)
- Lin Xu
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China
| | - Zhiping Zeng
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China
| | - Weidong Zhang
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China
| | - Gaoang Ren
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China
| | - Xiaobin Ling
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China
| | - Fengyu Huang
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China
| | - Peizhen Xie
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China
| | - Ying Su
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China.,Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California, USA
| | - Xiao-Kun Zhang
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China.,Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California, USA
| | - Hu Zhou
- School of Pharmaceutical Sciences, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, Xiamen, Fujian, China
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Yeung PL, Denissova NG, Nasello C, Hakhverdyan Z, Chen JD, Brenneman MA. Promyelocytic leukemia nuclear bodies support a late step in DNA double-strand break repair by homologous recombination. J Cell Biochem 2012; 113:1787-99. [PMID: 22213200 DOI: 10.1002/jcb.24050] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The PML protein and PML nuclear bodies (PML-NB) are implicated in multiple cellular functions relevant to tumor suppression, including DNA damage response. In most cases of acute promyelocytic leukemia, the PML and retinoic acid receptor alpha (RARA) genes are translocated, resulting in expression of oncogenic PML-RARα fusion proteins. PML-NB fail to form normally, and promyelocytes remain in an undifferentiated, abnormally proliferative state. We examined the involvement of PML protein and PML-NB in homologous recombinational repair (HRR) of chromosomal DNA double-strand breaks. Transient overexpression of wild-type PML protein isoforms produced hugely enlarged or aggregated PML-NB and reduced HRR by ~2-fold, suggesting that HRR depends to some extent upon normal PML-NB structure. Knockdown of PML by RNA interference sharply attenuated formation of PML-NB and reduced HRR by up to 20-fold. However, PML-knockdown cells showed apparently normal induction of H2AX phosphorylation and RAD51 foci after DNA damage by ionizing radiation. These findings indicate that early steps in HRR, including recognition of DNA double-strand breaks, initial processing of ends, and assembly of single-stranded DNA/RAD51 nucleoprotein filaments, do not depend upon PML-NB. The HRR deficit in PML-depleted cells thus reflects inhibition of later steps in the repair pathway. Expression of PML-RARα fusion proteins disrupted PML-NB structure and reduced HRR by up to 10-fold, raising the possibility that defective HRR and resulting genomic instability may figure in the pathogenesis, progression and relapse of acute promyelocytic leukemia.
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Affiliation(s)
- Percy Luk Yeung
- The Human Genetics Institute of New Jersey, Rutgers University, Piscataway, New Jersey, USA
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PMLRARα binds to Fas and suppresses Fas-mediated apoptosis through recruiting c-FLIP in vivo. Blood 2011; 118:3107-18. [PMID: 21803845 DOI: 10.1182/blood-2011-04-349670] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Defective Fas signaling leads to resistance to various anticancer therapies. Presence of potential inhibitors of Fas which could block Fas signaling can explain cancer cells resistance to apoptosis. We identified promyelocytic leukemia protein (PML) as a Fas-interacting protein using mass spectrometry analysis. The function of PML is blocked by its dominant-negative form PML-retinoic acid receptor α (PMLRARα). We found PMLRARα interaction with Fas in acute promyelocytic leukemia (APL)-derived cells and APL primary cells, and PML-Fas complexes in normal tissues. Binding of PMLRARα to Fas was mapped to the B-box domain of PML moiety and death domain of Fas. PMLRARα blockage of Fas apoptosis was demonstrated in U937/PR9 cells, human APL cells and transgenic mouse APL cells, in which PMLRARα recruited c-FLIP(L/S) and excluded procaspase 8 from Fas death signaling complex. PMLRARα expression in mice protected the mice against a lethal dose of agonistic anti-Fas antibody (P < .001) and the protected tissues contained Fas-PMLRARα-cFLIP complexes. Taken together, PMLRARα binds to Fas and blocks Fas-mediated apoptosis in APL by forming an apoptotic inhibitory complex with c-FLIP. The presence of PML-Fas complexes across different tissues implicates that PML functions in apoptosis regulation and tumor suppression are mediated by direct interaction with Fas.
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Lübbert M, Müller-Tidow C, Hofmann WK, Koeffler HP. Advances in the treatment of acute myeloid leukemia: From chromosomal aberrations to biologically targeted therapy. J Cell Biochem 2008; 104:2059-70. [DOI: 10.1002/jcb.21770] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Computational identification of the normal and perturbed genetic networks involved in myeloid differentiation and acute promyelocytic leukemia. Genome Biol 2008; 9:R38. [PMID: 18291030 PMCID: PMC2374711 DOI: 10.1186/gb-2008-9-2-r38] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2007] [Revised: 01/01/2008] [Accepted: 02/21/2008] [Indexed: 01/04/2023] Open
Abstract
A dissection of the genetic networks and circuitries is described for two form of leukaemia. Integrating transcription factor binding and gene expression profiling, networks are revealed that underly this important human disease. Background Acute myeloid leukemia (AML) comprises a group of diseases characterized by the abnormal development of malignant myeloid cells. Recent studies have demonstrated an important role for aberrant transcriptional regulation in AML pathophysiology. Although several transcription factors (TFs) involved in myeloid development and leukemia have been studied extensively and independently, how these TFs coordinate with others and how their dysregulation perturbs the genetic circuitry underlying myeloid differentiation is not yet known. We propose an integrated approach for mammalian genetic network construction by combining the analysis of gene expression profiling data and the identification of TF binding sites. Results We utilized our approach to construct the genetic circuitries operating in normal myeloid differentiation versus acute promyelocytic leukemia (APL), a subtype of AML. In the normal and disease networks, we found that multiple transcriptional regulatory cascades converge on the TFs Rora and Rxra, respectively. Furthermore, the TFs dysregulated in APL participate in a common regulatory pathway and may perturb the normal network through Fos. Finally, a model of APL pathogenesis is proposed in which the chimeric TF PML-RARα activates the dysregulation in APL through six mediator TFs. Conclusion This report demonstrates the utility of our approach to construct mammalian genetic networks, and to obtain new insights regarding regulatory circuitries operating in complex diseases in humans.
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Chromatin modifications induced by PML-RARalpha repress critical targets in leukemogenesis as analyzed by ChIP-Chip. Blood 2007; 111:2887-95. [PMID: 18024792 DOI: 10.1182/blood-2007-03-079921] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The translocation t(15;17) generates the chimeric PML-RARalpha transcription factor that is the initiating event of acute promyelocytic leukemia. A global view of PML-RARalpha transcriptional functions was obtained by genome-wide binding and chromatin modification analyses combined with genome-wide expression data. Chromatin immunoprecipitation (ChIP)-chip experiments identified 372 direct genomic PML-RARalpha targets. A subset of these was confirmed in primary acute promyelocytic leukemia. Direct PML-RARalpha targets include regulators of global transcriptional programs as well as critical regulatory genes for basic cellular functions such as cell-cycle control and apoptosis. PML-RARalpha binding universally led to HDAC1 recruitment, loss of histone H3 acetylation, increased tri-methylation of histone H3 lysine 9, and unexpectedly increased trimethylation of histone H3 lysine 4. The binding of PML-RARalpha to target promoters and the resulting histone modifications resulted in mRNA repression of functionally relevant genes. Taken together, our results reveal that the transcription factor PML-RARalpha regulates key cancer-related genes and pathways by inducing a repressed chromatin formation on its direct genomic target genes.
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Barber N, Belov L, Christopherson RI. All-trans retinoic acid induces different immunophenotypic changes on human HL60 and NB4 myeloid leukaemias. Leuk Res 2007; 32:315-22. [PMID: 17561254 DOI: 10.1016/j.leukres.2007.04.013] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2007] [Revised: 04/23/2007] [Accepted: 04/25/2007] [Indexed: 12/24/2022]
Abstract
All-trans retinoic acid (ATRA) is used to treat patients with acute promyelocytic leukaemia (APL), inducing APL cells to differentiate into abnormal neutrophils. To investigate the possible relationship between the chromosome translocation t(15;17) found in APL and ATRA treatment, the human myeloid leukaemia cell lines HL60 and NB4, that are PML-RARalpha negative and positive, respectively, were treated with ATRA and immunophenotyped using a CD antibody microarray. For HL60 cells, ATRA induced major increases in descending order of CD38, CD11b, CD45RO, CD11c, CD54 and CD36 with repression of CD117 and CD44. For NB4 cells, ATRA induced major increases in descending order of CD11c, CD54, CD11a, CD11b, CD53, CD65, CD138, CD66c and T-cell receptor alpha/beta (TCRalpha/beta), with repression of CD38 and CD9. The induction of a number of these CD antigens is consistent with the known differentiation of these leukaemias to abnormal neutrophils. Approximately half of the antigens up-regulated by ATRA on NB4 cells were adhesion molecules, including CD11a, CD11b, CD11c, CD54, CD66c and CD138, consistent with the increased adhesiveness of leukaemia cells observed for APL patients treated with ATRA. On HL60 cells, ATRA induced expression of CD38, CD43 and CD45RO and repressed CD117, while the converse was true on NB4 cells that contain chimeric PML-RARalpha. For NB4 cells, ATRA induced some remarkable increases in CD antigens not seen for HL60: CD14 (16.6-fold), CD32 (27.8), CD53 (20.5), CD65 (139), CD66c (79.7), CD126 (15.1), and CD138 (57.6). The expression of these antigens may be regulated by PML-RARalpha in the presence of ATRA. Such CD antigens could be targets for synergistic treatment of APL with therapeutic antibodies following ATRA treatment.
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Affiliation(s)
- Nicole Barber
- School of Molecular and Microbial Biosciences, University of Sydney, NSW 2006, Australia
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Zada AAP, Geletu MH, Pulikkan JA, Müller-Tidow C, Reddy VA, Christopeit M, Hiddemann WD, Behre HM, Tenen DG, Behre G. Proteomic analysis of acute promyelocytic leukemia: PML-RARalpha leads to decreased phosphorylation of OP18 at serine 63. Proteomics 2007; 6:5705-19. [PMID: 17001604 DOI: 10.1002/pmic.200600307] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In the present study, we employed 2-DE to characterize the effect of the acute promyelocytic leukemia (APL)-specific PML-RARalpha fusion protein on the proteome. Differentially expressed proteins, a number of which are related to the cell cycle function, including oncoprotein18 (OP18), heat shock protein70, glucose-regulated protein75, and peptidyl-prolyl isomerase, were identified by MS. Subsequent bioinformatic pathway discovery revealed an integrated network constituting SMARCB1, MYC, and TP53-regulated pathways. The data from the DNA microarray and proteomic experiments demonstrated the correlation between the translocation and higher expression of OP18 at mRNA and protein levels. Transient cotransfection assay revealed that PML-RARalpha is a potent activator of OP18 promoter and this transcriptional activation is retinoic acid sensitive. PML-RARalpha induction also leads to decreased phosphorylation on Ser63 residue of OP18, which is okadaic acid sensitive suggesting the involvement of a phosphatase pathway. Overexpression of a constitutively phosphorylated Ser63 mutant of OP18 in PML-RARalpha expressing APL patient, PR9, and NB4 cells led to a G2/M-phase arrest in contrast to a phosphorylation-deficient Ser63 mutant and untransfected control. Taken together, our results demonstrate the significance of decreased Ser63 phosphorylation of OP18 in PML-RARalpha-mediated effects on cell cycle.
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MESH Headings
- Cell Line
- Clone Cells
- Computational Biology/methods
- Electrophoresis, Gel, Two-Dimensional
- Gene Expression Profiling
- Genes, Reporter
- Humans
- Leukemia, Promyelocytic, Acute/metabolism
- Leukemia, Promyelocytic, Acute/pathology
- Luciferases/metabolism
- Mass Spectrometry
- Mutation
- Oncogene Proteins, Fusion/analysis
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/metabolism
- Peptide Mapping
- Phosphorylation
- Protein Isoforms/chemistry
- Protein Isoforms/genetics
- Protein Structure, Secondary
- Proteome/analysis
- Proteomics/methods
- RNA, Messenger/metabolism
- Recombinant Fusion Proteins/metabolism
- Serine/metabolism
- Stathmin/chemistry
- Stathmin/genetics
- Stathmin/metabolism
- Transfection
- U937 Cells
- Zinc Sulfate
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Yuan W, Payton JE, Holt MS, Link DC, Watson MA, DiPersio JF, Ley TJ. Commonly dysregulated genes in murine APL cells. Blood 2006; 109:961-70. [PMID: 17008535 PMCID: PMC1785140 DOI: 10.1182/blood-2006-07-036640] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
To identify genes that are commonly dysregulated in a murine model of acute promyelocytic leukemia (APL), we first defined gene expression patterns during normal murine myeloid development; serial gene expression profiling studies were performed with primary murine hematopoietic progenitors that were induced to undergo myeloid maturation in vitro with G-CSF. Many genes were reproducibly expressed in restricted developmental "windows," suggesting a structured hierarchy of expression that is relevant for the induction of developmental fates and/or differentiated cell functions. We compared the normal myeloid developmental transcriptome with that of APL cells derived from mice expressing PML-RARalpha under control of the murine cathepsin G locus. While many promyelocyte-specific genes were highly expressed in all APL samples, 116 genes were reproducibly dysregulated in many independent APL samples, including Fos, Jun, Egr1, Tnf, and Vcam1. However, this set of commonly dysregulated genes was expressed normally in preleukemic, early myeloid cells from the same mouse model, suggesting that dysregulation occurs as a "downstream" event during disease progression. These studies suggest that the genetic events that lead to APL progression may converge on common pathways that are important for leukemia pathogenesis.
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MESH Headings
- Animals
- Cathepsin G
- Cathepsins/genetics
- Cell Differentiation
- Disease Progression
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
- Genes, Neoplasm
- Hematopoietic Stem Cells/cytology
- Hematopoietic Stem Cells/drug effects
- Leukemia, Promyelocytic, Acute/etiology
- Leukemia, Promyelocytic, Acute/genetics
- Leukemia, Promyelocytic, Acute/pathology
- Mice
- Mice, Inbred C57BL
- Myeloid Cells/cytology
- Oncogene Proteins, Fusion/genetics
- Serine Endopeptidases/genetics
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Affiliation(s)
- Wenlin Yuan
- Department of Medicine, Siteman Cancer Center, and Department of Pathology and Immunology, Washington University, St Louis, MO 63110, USA
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