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Howard JN, Zaikos TD, Levinger C, Rivera E, McMahon EK, Holmberg CS, Terao J, Sanz M, Copertino DC, Wang W, Soriano-Sarabia N, Jones RB, Bosque A. The HIV latency reversing agent HODHBt inhibits the phosphatases PTPN1 and PTPN2. JCI Insight 2024; 9:e179680. [PMID: 39115957 PMCID: PMC11457865 DOI: 10.1172/jci.insight.179680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 08/02/2024] [Indexed: 08/10/2024] Open
Abstract
Nonreceptor tyrosine phosphatases (NTPs) play an important role in regulating protein phosphorylation and have been proposed as attractive therapeutic targets for cancer and metabolic diseases. We have previously identified that 3-Hydroxy-1,2,3-benzotriazin-4(3H)-one (HODHBt) enhanced STAT activation upon cytokine stimulation, leading to increased reactivation of latent HIV and effector functions of NK and CD8 T cells. Here, we demonstrate that HODHBt interacted with and inhibited the NTPs PTPN1 and PTPN2 through a mixed inhibition mechanism. We also confirm that PTPN1 and PTPN2 specifically controlled the phosphorylation of different STATs. The small molecule ABBV-CLS-484 (AC-484) is an active site inhibitor of PTPN1 and PTPN2 currently in clinical trials for advanced solid tumors. We compared AC-484 and HODHBt and found similar effects on STAT5 and immune activation, albeit with different mechanisms of action leading to varying effects on latency reversal. Our studies provide the first specific evidence to our knowledge that enhancing STAT phosphorylation via inhibition of PTPN1 and PTPN2 is an effective tool against HIV.
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Affiliation(s)
- J. Natalie Howard
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - Thomas D. Zaikos
- Department of Pathology, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Callie Levinger
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - Esteban Rivera
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - Elyse K. McMahon
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - Carissa S. Holmberg
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - Joshua Terao
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - Marta Sanz
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - Dennis C. Copertino
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
- Department of Medicine, Weill Cornell Medical College, New York, New York, USA
| | - Weisheng Wang
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - Natalia Soriano-Sarabia
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
| | - R. Brad Jones
- Department of Medicine, Weill Cornell Medical College, New York, New York, USA
| | - Alberto Bosque
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC, USA
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Choi YR, Na HJ, Lee JA, Kim Y, Kim YS, Kim MJ. Discovery of (-)-epigallocatechin gallate, a novel olfactory receptor 2AT4 agonist that regulates proliferation and apoptosis in leukemia cells. Heliyon 2024; 10:e30298. [PMID: 38778941 PMCID: PMC11108860 DOI: 10.1016/j.heliyon.2024.e30298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 04/23/2024] [Accepted: 04/23/2024] [Indexed: 05/25/2024] Open
Abstract
Olfactory receptors (ORs), the largest family of G protein-coupled receptors (GPCRs), are ectopically expressed in cancer cells and are involved in cellular physiological processes, but their function as anticancer targets is still potential. OR2AT4 is expressed in leukemia cells, influencing the proliferation and apoptosis, yet the limited number of known OR2AT4 agonists makes it challenging to fully generalize the receptor's function. In this study, we aimed to identify new ligands for OR2AT4 and to investigate their functions and mechanisms in K562 leukemia cells. After producing the recombinant OR2AT4 protein, immobilizing it on a surface plasmon resonance chip, and conducting screening to confirm binding activity using 258 chemicals, five novel OR2AT4 ligands were discovered. As a result of examining changes in intracellular calcium by five ligands in OR2AT4-expressing cells and K562 cells, (-)-epigallocatechin gallate (EGCG) was identified as an OR2AT4 agonist in both cells. EGCG reduced the viability of K562 cells and induced apoptosis in K562 cells. EGCG increased the expression of cleaved caspase 3/8 and had no effect on the expression of Bax and Bcl-2, indicating that it induced apoptosis through the extrinsic pathway. Additionally, the initiation of the extrinsic apoptosis pathway in EGCG-induced K562 cells was due to the activation of OR2AT4, using an OR2AT4 antagonist. This study highlights the potential of EGCG as an anti-cancer agent against leukemia and OR2AT4 as a target, making it a new anti-cancer drug.
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Affiliation(s)
- Yae Rim Choi
- Division of Food Functionality Research, Korea Food Research Institute, Wanju-gun 55365, Republic of Korea
- Department of Food Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Hyun-Jin Na
- Division of Food Functionality Research, Korea Food Research Institute, Wanju-gun 55365, Republic of Korea
| | - Jin-Ah Lee
- Division of Food Functionality Research, Korea Food Research Institute, Wanju-gun 55365, Republic of Korea
| | - Yiseul Kim
- Division of Food Functionality Research, Korea Food Research Institute, Wanju-gun 55365, Republic of Korea
| | - Young-Suk Kim
- Department of Food Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Min Jung Kim
- Division of Food Functionality Research, Korea Food Research Institute, Wanju-gun 55365, Republic of Korea
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Ma Y, Guo G, Li T, Wen F, Yang J, Chen B, Wang X, Chen JL. A novel imatinib-upregulated long noncoding RNA plays a critical role in inhibition of tumor growth induced by Abl oncogenes. Mol Cancer 2022; 21:5. [PMID: 34980123 PMCID: PMC8722111 DOI: 10.1186/s12943-021-01478-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 12/06/2021] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Dysregulation of long noncoding RNAs (lncRNAs) has been linked to various human cancers. Bcr-Abl oncogene that results from a reciprocal translocation between human chromosome 9 and 22, is associated with several hematological malignancies. However, the role of lncRNAs in Bcr-Abl-induced leukemia remains largely unexplored. METHODS LncRNA cDNA microarray was employed to identify key lncRNAs involved in Bcr-Abl-mediated cellular transformation. Abl-transformed cell survival and xenografted tumor growth in mice were evaluated to dissect the role of imatinib-upregulated lncRNA 1 (IUR1) in Abl-induced tumorigenesis. Primary bone marrow transformation and in vivo leukemia transplant using lncRNA-IUR1 knockout (KO) mice were further conducted to address the functional relevance of lncRNA-IUR1 in Abl-mediated leukemia. Transcriptome RNA-seq and Western blotting were performed to determine the mechanisms by which lncRNA-IUR1 regulates Bcr-Abl-induced tumorigenesis. RESULTS We identified lncRNA-IUR1 as a critical negative regulator of Bcr-Abl-induced tumorigenesis. LncRNA-IUR1 expressed in a very low level in Bcr-Abl-positive cells from chronic myeloid leukemia patients. Interestingly, it was significantly induced in Abl-positive leukemic cells treated by imatinib. Depletion of lncRNA-IUR1 promoted survival of Abl-transformed human leukemic cells in experiments in vitro and xenografted tumor growth in mice, whereas ectopic expression of lncRNA-IUR1 sensitized the cells to apoptosis and suppressed tumor growth. In concert, silencing murine lncRNA-IUR1 in Abl-transformed cells accelerated cell survival and the development of leukemia in mice. Furthermore, lncRNA-IUR1 deficient mice were generated, and we observed that knockout of murine lncRNA-IUR1 facilitated Bcr-Abl-mediated primary bone marrow transformation. Moreover, animal leukemia model revealed that lncRNA-IUR1 deficiency promoted Abl-transformed cell survival and development of leukemia in mice. Mechanistically, we demonstrated that lncRNA-IUR1 suppressed Bcr-Abl-induced tumorigenesis through negatively regulating STAT5-mediated GATA3 expression. CONCLUSIONS These findings unveil an inhibitory role of lncRNA-IUR1 in Abl-mediated cellular transformation, and provide new insights into molecular mechanisms underlying Abl-induced leukemogenesis.
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Affiliation(s)
- Yun Ma
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Guijie Guo
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, 100101, China
- Key Laboratory of Fujian-Taiwan Animal Pathogen Biology, College of Animal Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Tingting Li
- Key Laboratory of Fujian-Taiwan Animal Pathogen Biology, College of Animal Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Faxin Wen
- Key Laboratory of Fujian-Taiwan Animal Pathogen Biology, College of Animal Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Jianling Yang
- Institute of Medical Innovation and Research, Peking University Third Hospital, Beijing, 100191, China
| | - Biao Chen
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xuefei Wang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, 100101, China
| | - Ji-Long Chen
- Key Laboratory of Fujian-Taiwan Animal Pathogen Biology, College of Animal Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
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Huang TT, Wang X, Qiang SJ, Zhao ZN, Wu ZX, Ashby CR, Li JZ, Chen ZS. The Discovery of Novel BCR-ABL Tyrosine Kinase Inhibitors Using a Pharmacophore Modeling and Virtual Screening Approach. Front Cell Dev Biol 2021; 9:649434. [PMID: 33748144 PMCID: PMC7969810 DOI: 10.3389/fcell.2021.649434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 02/10/2021] [Indexed: 11/23/2022] Open
Abstract
Chronic myelogenous leukemia (CML) typically results from a reciprocal translocation between chromosomes 9 and 22 to produce the bcr-abl oncogene that when translated, yields the p210 BCR-ABL protein in more than 90% of all CML patients. This protein has constitutive tyrosine kinase activity that activates numerous downstream pathways that ultimately produces uncontrolled myeloid proliferation. Although the use of the BCR-ABL tyrosine kinase inhibitors (TKIs), such as imatinib, nilotinib, dasatinib, bosutinib, and ponatinib have increased the overall survival of CML patients, their use is limited by drug resistance and severe adverse effects. Therefore, there is the need to develop novel compounds that can overcome these problems that limit the use of these drugs. Therefore, in this study, we sought to find novel compounds using Hypogen and Hiphip pharmacophore models based on the structures of clinically approved BCR-ABL TKIs. We also used optimal pharmacophore models such as three-dimensional queries to screen the ZINC database to search for potential BCR-ABL inhibitors. The hit compounds were further screened using Lipinski’s rule of five, ADMET and molecular docking, and the efficacy of the hit compounds was evaluated. Our in vitro results indicated that compound ZINC21710815 significantly inhibited the proliferation of K562, BaF3/WT, and BaF3/T315I leukemia cells by inducing cell cycle arrest. The compound ZINC21710815 decreased the expression of p-BCR-ABL, STAT5, and Crkl and produced apoptosis and autophagy. Our results suggest that ZINC21710815 may be a potential BCR-ABL inhibitor that should undergo in vivo evaluation.
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Affiliation(s)
| | - Xin Wang
- School of Pharmacy, Lanzhou University, Lanzhou, China
| | | | - Zhen-Nan Zhao
- School of Pharmacy, Lanzhou University, Lanzhou, China
| | - Zhuo-Xun Wu
- College of Pharmacy and Health Sciences, St. John's University, Queens, NY, United States
| | - Charles R Ashby
- College of Pharmacy and Health Sciences, St. John's University, Queens, NY, United States
| | - Jia-Zhong Li
- School of Pharmacy, Lanzhou University, Lanzhou, China
| | - Zhe-Sheng Chen
- College of Pharmacy and Health Sciences, St. John's University, Queens, NY, United States
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Liu H, Cui Y, Bai Y, Fang Y, Gao T, Wang G, Zhu L, Dong Q, Zhang S, Yao Y, Song C, Niu X, Jin Y, Li P, Cao C, Liu X. The tyrosine kinase c-Abl potentiates interferon-mediated antiviral immunity by STAT1 phosphorylation. iScience 2021; 24:102078. [PMID: 33644712 PMCID: PMC7887405 DOI: 10.1016/j.isci.2021.102078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 11/28/2020] [Accepted: 01/15/2021] [Indexed: 01/02/2023] Open
Abstract
Interferon (IFN)-induced activation of the signal transducer and activator of transcription (STAT) family is an important event in antiviral immunity. Here, we show that the nonreceptor kinases c-Abl and Arg directly interact with STAT1 and potentiate the phosphorylation of STAT1 on Y701. c-Abl/Arg could mediate STAT1 phosphorylation independent of Janus kinases in the absence of IFNγ and potentiate IFNγ-mediated STAT1 phosphorylation. Moreover, STAT1 dimerization, nuclear translocation, and downstream gene transcription are regulated by c-Abl/Arg. c-Abl/Arg (abl1/abl2) deficiency significantly suppresses antiviral responses in vesicular stomatitis virus-infected cells. Compared to vehicle, administration of the c-Abl/Arg selective inhibitor AMN107 resulted in significantly increased mortality in mice infected with human influenza virus. Our study demonstrates that c-Abl plays an essential role in the STAT1 activation signaling pathway and provides an important approach for antiviral immunity regulation.
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Affiliation(s)
- Hainan Liu
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Yan Cui
- Beijing Institute of Biotechnology, Beijing 100850, China.,Staidson Bio-pharmaceutics (Beijing) Co. Ltd, Beijing 100176, China
| | - Yu Bai
- Anhui University, Hefei 230601, China
| | - Yi Fang
- The Fifth MedicaI Centre, Chinese PLA GeneraI HospitaI, Beijing 100071, China
| | - Ting Gao
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Guangfei Wang
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Lin Zhu
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Qincai Dong
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Shuwei Zhang
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Yi Yao
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Caiwei Song
- Beijing Institute of Biotechnology, Beijing 100850, China
| | | | - Yanwen Jin
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Ping Li
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Cheng Cao
- Beijing Institute of Biotechnology, Beijing 100850, China
| | - Xuan Liu
- Beijing Institute of Biotechnology, Beijing 100850, China
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Prospects for Clinical Development of Stat5 Inhibitor IST5-002: High Transcriptomic Specificity in Prostate Cancer and Low Toxicity In Vivo. Cancers (Basel) 2020; 12:cancers12113412. [PMID: 33217941 PMCID: PMC7724566 DOI: 10.3390/cancers12113412] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/09/2020] [Accepted: 11/11/2020] [Indexed: 12/22/2022] Open
Abstract
Simple Summary There is an unmet medical need for new and potent pharmacological inhibitor drugs for the protein Stat5 that would be orally bioavailable for treatment of several different cancers. Previous work has established a critical role for Stat5 in molecular and clinical progression of prostate cancer to metastatic disease and in the pathogenesis of several leukemias and blood-based disorders. Our group has developed a potent pharmacological inhibitor for Stat5, IST5-002, which targets two critical steps in the activation process of Stat5 in cancer cells. In the present work, we evaluated the characteristics of IST5-002 for further development into a cancer drug. We evaluated whether IST5-002 affects the Stat5 targets genes in prostate cancer, defined more closely its mechanisms of action, and investigated its initial toxicity as the basis for further development in order to enable its entrance into clinical testing in patients. Our study supports optimization of IST5-002 compound for oral bioavailability and for clinical development. Abstract Stat5 is of significant interest in the search for new therapeutics for prostate cancer (PC) and hematopoietic disorders. We evaluated the transcriptomic specificity of the Stat5a/b inhibitor IST5-002 (IST5) in PC, defined more closely its mechanisms of action, and investigated the in vivo toxicity of IST5 for further optimization for clinical development. The transcriptomic specificity of IST5 vs. genetic Stat5 knockdown was evaluated by RNA-seq analysis, which showed high similarity with the Pearson correlation coefficient ranging from 0.98–0.99. The potency of IST5 vs. its derivative lacking the phosphate group in suppressing Stat5 was evaluated in two separate but complementary assays. The inhibitory activity of IST5 against kinases was investigated in cell-free assays followed by more focused evaluation in a cell-based assay. IST5 has no specific inhibitory activity against 54 kinases, while suppressing Stat5 phosphorylation and subsequent dimerization in PC cells. The phosphate group was not critical for the biological activity of IST5 in cells. The acute, sub-chronic and chronic toxicity studies of IST5 were carried out in mice. IST5 did not cause any significant toxic effects or changes in the blood profiles. The present work supports further optimization of IST5 for oral bioavailability for clinical development for therapies for solid tumors, hematological and myeloproliferative disorders.
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Involvement of STAT5 in Oncogenesis. Biomedicines 2020; 8:biomedicines8090316. [PMID: 32872372 PMCID: PMC7555335 DOI: 10.3390/biomedicines8090316] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/19/2020] [Accepted: 08/26/2020] [Indexed: 12/24/2022] Open
Abstract
Signal transducer and activator of transcription (STAT) proteins, and in particular STAT3, have been established as heavily implicated in cancer. Recently, the involvement of STAT5 signalling in the pathology of cancer has been shown to be of increasing importance. STAT5 plays a crucial role in the development of the mammary gland and the homeostasis of the immune system. However, in various cancers, aberrant STAT5 signalling promotes the expression of target genes, such as cyclin D, Bcl-2 and MMP-2, that result in increased cell proliferation, survival and metastasis. To target constitutive STAT5 signalling in cancers, there are several STAT5 inhibitors that can prevent STAT5 phosphorylation, dimerisation, or its transcriptional activity. Tyrosine kinase inhibitors (TKIs) that target molecules upstream of STAT5 could also be utilised. Consequently, since STAT5 contributes to tumour aggressiveness and cancer progression, inhibiting STAT5 constitutive activation in cancers that rely on its signalling makes for a promising targeted treatment option.
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Wang S, Denton KE, Hobbs KF, Weaver T, McFarlane JMB, Connelly KE, Gignac MC, Milosevich N, Hof F, Paci I, Musselman CA, Dykhuizen EC, Krusemark CJ. Optimization of Ligands Using Focused DNA-Encoded Libraries To Develop a Selective, Cell-Permeable CBX8 Chromodomain Inhibitor. ACS Chem Biol 2020; 15:112-131. [PMID: 31755685 DOI: 10.1021/acschembio.9b00654] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polycomb repressive complex 1 (PRC1) is critical for mediating gene expression during development. Five chromobox (CBX) homolog proteins, CBX2, CBX4, CBX6, CBX7, and CBX8, are incorporated into PRC1 complexes, where they mediate targeting to trimethylated lysine 27 of histone H3 (H3K27me3) via the N-terminal chromodomain (ChD). Individual CBX paralogs have been implicated as drug targets in cancer; however, high similarities in sequence and structure among the CBX ChDs provide a major obstacle in developing selective CBX ChD inhibitors. Here we report the selection of small, focused, DNA-encoded libraries (DELs) against multiple homologous ChDs to identify modifications to a parental ligand that confer both selectivity and potency for the ChD of CBX8. This on-DNA, medicinal chemistry approach enabled the development of SW2_110A, a selective, cell-permeable inhibitor of the CBX8 ChD. SW2_110A binds CBX8 ChD with a Kd of 800 nM, with minimal 5-fold selectivity for CBX8 ChD over all other CBX paralogs in vitro. SW2_110A specifically inhibits the association of CBX8 with chromatin in cells and inhibits the proliferation of THP1 leukemia cells driven by the MLL-AF9 translocation. In THP1 cells, SW2_110A treatment results in a significant decrease in the expression of MLL-AF9 target genes, including HOXA9, validating the previously established role for CBX8 in MLL-AF9 transcriptional activation, and defining the ChD as necessary for this function. The success of SW2_110A provides great promise for the development of highly selective and cell-permeable probes for the full CBX family. In addition, the approach taken provides a proof-of-principle demonstration of how DELs can be used iteratively for optimization of both ligand potency and selectivity.
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Affiliation(s)
- Sijie Wang
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University and Purdue University Center for Cancer Research, 575 Stadium Mall Drive, West Lafayette, Indiana 47906, United States
| | - Kyle E. Denton
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University and Purdue University Center for Cancer Research, 575 Stadium Mall Drive, West Lafayette, Indiana 47906, United States
| | - Kathryn F. Hobbs
- Department of Biochemistry, Carver College of Medicine, University of Iowa, 51 Newton Road, Iowa City, Iowa 52242, United States
| | - Tyler Weaver
- Department of Biochemistry, Carver College of Medicine, University of Iowa, 51 Newton Road, Iowa City, Iowa 52242, United States
| | | | - Katelyn E. Connelly
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University and Purdue University Center for Cancer Research, 575 Stadium Mall Drive, West Lafayette, Indiana 47906, United States
| | - Michael C. Gignac
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, Canada
| | - Natalia Milosevich
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, Canada
| | - Fraser Hof
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, Canada
| | - Irina Paci
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, Canada
| | - Catherine A. Musselman
- Department of Biochemistry, Carver College of Medicine, University of Iowa, 51 Newton Road, Iowa City, Iowa 52242, United States
| | - Emily C. Dykhuizen
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University and Purdue University Center for Cancer Research, 575 Stadium Mall Drive, West Lafayette, Indiana 47906, United States
| | - Casey J. Krusemark
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University and Purdue University Center for Cancer Research, 575 Stadium Mall Drive, West Lafayette, Indiana 47906, United States
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Jego G, Hermetet F, Girodon F, Garrido C. Chaperoning STAT3/5 by Heat Shock Proteins: Interest of Their Targeting in Cancer Therapy. Cancers (Basel) 2019; 12:cancers12010021. [PMID: 31861612 PMCID: PMC7017265 DOI: 10.3390/cancers12010021] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 12/05/2019] [Accepted: 12/13/2019] [Indexed: 01/16/2023] Open
Abstract
While cells from multicellular organisms are dependent upon exogenous signals for their survival, growth, and proliferation, commitment to a specific cell fate requires the correct folding and maturation of proteins, as well as the degradation of misfolded or aggregated proteins within the cell. This general control of protein quality involves the expression and the activity of molecular chaperones such as heat shock proteins (HSPs). HSPs, through their interaction with the STAT3/STAT5 transcription factor pathway, can be crucial both for the tumorigenic properties of cancer cells (cell proliferation, survival) and for the microenvironmental immune cell compartment (differentiation, activation, cytokine secretion) that contributes to immunosuppression, which, in turn, potentially promotes tumor progression. Understanding the contribution of chaperones such as HSP27, HSP70, HSP90, and HSP110 to the STAT3/5 signaling pathway has raised the possibility of targeting such HSPs to specifically restrain STAT3/5 oncogenic functions. In this review, we present how HSPs control STAT3 and STAT5 activation, and vice versa, how the STAT signaling pathways modulate HSP expression. We also discuss whether targeting HSPs is a valid therapeutic option and which HSP would be the best candidate for such a strategy.
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Affiliation(s)
- Gaëtan Jego
- INSERM, LNC UMR1231, team HSP-Pathies, University of Bourgogne Franche-Comté, F-21000 Dijon, France; (F.H.); (F.G.)
- UFR des Sciences de Santé, University of Burgundy and Franche-Comté, F-21000 Dijon, France
- Correspondence: (C.G.); (G.J.); Tel.: +33-3-8039-3345 (G.J.); Fax: +33-3-8039-3434 (C.G. & G.J.)
| | - François Hermetet
- INSERM, LNC UMR1231, team HSP-Pathies, University of Bourgogne Franche-Comté, F-21000 Dijon, France; (F.H.); (F.G.)
- UFR des Sciences de Santé, University of Burgundy and Franche-Comté, F-21000 Dijon, France
| | - François Girodon
- INSERM, LNC UMR1231, team HSP-Pathies, University of Bourgogne Franche-Comté, F-21000 Dijon, France; (F.H.); (F.G.)
- UFR des Sciences de Santé, University of Burgundy and Franche-Comté, F-21000 Dijon, France
- Haematology laboratory, Dijon University Hospital, F-21000 Dijon, France
| | - Carmen Garrido
- INSERM, LNC UMR1231, team HSP-Pathies, University of Bourgogne Franche-Comté, F-21000 Dijon, France; (F.H.); (F.G.)
- UFR des Sciences de Santé, University of Burgundy and Franche-Comté, F-21000 Dijon, France
- Centre Georges François Leclerc, 21000 Dijon, France
- Correspondence: (C.G.); (G.J.); Tel.: +33-3-8039-3345 (G.J.); Fax: +33-3-8039-3434 (C.G. & G.J.)
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Prosurvival kinase PIM2 is a therapeutic target for eradication of chronic myeloid leukemia stem cells. Proc Natl Acad Sci U S A 2019; 116:10482-10487. [PMID: 31068472 DOI: 10.1073/pnas.1903550116] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A major obstacle to curing chronic myeloid leukemia (CML) is the intrinsic resistance of CML stem cells (CMLSCs) to the drug imatinib mesylate (IM). Prosurvival genes that are preferentially expressed in CMLSCs compared with normal hematopoietic stem cells (HSCs) represent potential therapeutic targets for selectively eradicating CMLSCs. However, the discovery of such preferentially expressed genes has been hampered by the inability to completely separate CMLSCs from HSCs, which display a very similar set of surface markers. To overcome this challenge, and to minimize confounding effects of individual differences in gene expression profiles, we performed single-cell RNA-seq on CMLSCs and HSCs that were isolated from the same patient and distinguished based on the presence or absence of BCR-ABL. Among genes preferentially expressed in CMLSCs is PIM2, which encodes a prosurvival serine-threonine kinase that phosphorylates and inhibits the proapoptotic protein BAD. We show that IM resistance of CMLSCs is due, at least in part, to maintenance of BAD phosphorylation by PIM2. We find that in CMLSCs, PIM2 expression is promoted by both a BCR-ABL-dependent (IM-sensitive) STAT5-mediated pathway and a BCR-ABL-independent (IM-resistant) STAT4-mediated pathway. Combined treatment with IM and a PIM inhibitor synergistically increases apoptosis of CMLSCs, suppresses colony formation, and significantly prolongs survival in a mouse CML model, with a negligible effect on HSCs. Our results reveal a therapeutically targetable mechanism of IM resistance in CMLSCs. The experimental approach that we describe can be generally applied to other malignancies that harbor oncogenic fusion proteins or other characteristic genetic markers.
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11
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Anthelmintic niclosamide suppresses transcription of BCR-ABL fusion oncogene via disabling Sp1 and induces apoptosis in imatinib-resistant CML cells harboring T315I mutant. Cell Death Dis 2018; 9:68. [PMID: 29358661 PMCID: PMC5833368 DOI: 10.1038/s41419-017-0075-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 09/13/2017] [Accepted: 09/25/2017] [Indexed: 12/12/2022]
Abstract
Tyrosine kinase BCR-ABL fusion protein is the driver in patients with chronic myeloid leukemia (CML). The gate-keeper mutation T315I is the most challenging mutant due to its resistance to most tyrosine kinase inhibitors (TKIs). The third generation TKI ponatinib is the only effective TKI to treat CML patients harboring T315I-BCR-ABL mutation, but with high rate of major arterial thrombotic events. Alternative strategies to specifically target T315I-BCR-ABL are needed for the treatment of CML patients harboring such a mutation. Given that Sp1 is a fundamental transcriptional factor to positively regulate WT-BCR-ABL fusion oncogene, the purpose of this investigation was aimed at evaluating the anti-tumor activity and the underlying mechanism in terms of Sp1 regulational effect on the transcription of T315I-BCR-ABL fusion oncogene. Like in WT-BCR-ABL, we identified enrichment of Sp1 on the promoter of T315I-BCR-ABL fusion gene. Treatment of WT- and T315I-BCR-ABL-expressing CML cells by niclosamide diminished such an enrichment of Sp1, and decreased WT- and T315I-BCR-ABL transcription and its downstream signaling molecules such as STAT5 and Akt. Further, niclosamide significantly inhibited the proliferation and induced apoptosis through intrinsic pathway. The in vivo efficacy validation of p-niclosamide, a water soluble derivative of niclosamide, showed that p-niclosamide significantly inhibited the tumor burden of nude mice subcutaneously bearing T315I-BCR-ABL-expressing CML cells, and prolonged the survival of allografted leukemic mice harboring BaF3-T315I-BCR-ABL. We conclude that niclosamide is active against T315I-BCR-ABL-expressing cells, and may be a promising agent for CML patients regardless of T315I mutation status.
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12
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Mukherjee K, Sha X, Magimaidas A, Maifrede S, Skorski T, Bhatia R, Hoffman B, Liebermann DA. Gadd45a deficiency accelerates BCR-ABL driven chronic myelogenous leukemia. Oncotarget 2017; 8:10809-10821. [PMID: 28086219 PMCID: PMC5355225 DOI: 10.18632/oncotarget.14580] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 11/23/2016] [Indexed: 12/26/2022] Open
Abstract
The Gadd45a stress sensor gene is a member in the Gadd45 family of genes that includes Gadd45b & Gadd45g. To investigate the effect of GADD45A in the development of CML, syngeneic wild type lethally irradiated mice were reconstituted with either wild type or Gadd45a null myeloid progenitors transduced with a retroviral vector expressing the 210-kD BCR-ABL fusion oncoprotein. Loss of Gadd45a was observed to accelerate BCR-ABL driven CML resulting in the development of a more aggressive disease, a significantly shortened median mice survival time, and increased BCR-ABL expressing leukemic stem/progenitor cells (GFP+Lin- cKit+Sca+). GADD45A deficient progenitors expressing BCR-ABL exhibited increased proliferation and decreased apoptosis relative to WT counterparts, which was associated with enhanced PI3K-AKT-mTOR-4E-BP1 signaling, upregulation of p30C/EBPa expression, and hyper-activation of p38 and Stat5. Furthermore, Gadd45a expression in samples obtained from CML patients was upregulated in more indolent chronic phase CML samples and down regulated in aggressive accelerated phase CML and blast crisis CML. These results provide novel evidence that Gadd45a functions as a suppressor of BCR/ABL driven leukemia and may provide a unique prognostic marker of CML progression.
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Affiliation(s)
- Kaushiki Mukherjee
- Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA
| | - Xiaojin Sha
- Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA
| | - Andrew Magimaidas
- Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA.,Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Silvia Maifrede
- Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA.,Department of Microbiology and Immunology, Temple University, Philadelphia, PA, USA
| | - Tomasz Skorski
- Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA.,Department of Microbiology and Immunology, Temple University, Philadelphia, PA, USA
| | - Ravi Bhatia
- Division of Hematology and Oncology, University of Alabama, Tuscaloosa, AL, USA
| | - Barbara Hoffman
- Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA.,Department of Medical Genetics and Molecular Biochemistry, Temple University, Philadelphia, PA, USA
| | - Dan A Liebermann
- Fels Institute for Cancer Research and Molecular Biology, Philadelphia, PA, USA.,Department of Medical Genetics and Molecular Biochemistry, Temple University, Philadelphia, PA, USA
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13
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Elumalai N, Natarajan K, Berg T. Halogen-substituted catechol bisphosphates are potent and selective inhibitors of the transcription factor STAT5b. Bioorg Med Chem 2017; 25:3871-3882. [DOI: 10.1016/j.bmc.2017.05.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Revised: 05/14/2017] [Accepted: 05/17/2017] [Indexed: 01/10/2023]
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14
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Chromatin-enriched lncRNAs can act as cell-type specific activators of proximal gene transcription. Nat Struct Mol Biol 2017. [PMID: 28628087 PMCID: PMC5682930 DOI: 10.1038/nsmb.3424] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We recently described a new class of long noncoding RNA defined by especially tight chromatin association, whose presence is strongly correlated with expression of nearby genes in HEK293 cells. Here we critically examine the generality and cis-enhancer mechanism of this class of chromatin enriched RNA (cheRNA). CheRNA are largely cell-type specific, and remain the most effective chromatin signature for predicting cis-gene transcription in all cell types examined. Targeted depletion of three cheRNAs decreases gene expression of their neighbors, indicating potential co-activator function. Single-molecule FISH of one cheRNA-distal target gene pair suggests spatial overlap consistent with a role in chromosome looping. In another example, the cheRNA HIDALGO stimulates the fetal hemoglobin HBG1 gene during erythroid differentiation by promoting contacts to a downstream enhancer. Our results suggest that many cheRNAs activate proximal, lineage-specific gene transcription.
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15
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Fulcher LJ, Hutchinson LD, Macartney TJ, Turnbull C, Sapkota GP. Targeting endogenous proteins for degradation through the affinity-directed protein missile system. Open Biol 2017; 7:170066. [PMID: 28490657 PMCID: PMC5451546 DOI: 10.1098/rsob.170066] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 04/19/2017] [Indexed: 12/18/2022] Open
Abstract
Targeted proteolysis of endogenous proteins is desirable as a research toolkit and in therapeutics. CRISPR/Cas9-mediated gene knockouts are irreversible and often not feasible for many genes. Similarly, RNA interference approaches necessitate prolonged treatments, can lead to incomplete knockdowns and are often associated with off-target effects. Targeted proteolysis can overcome these limitations. In this report, we describe an affinity-directed protein missile (AdPROM) system that harbours the von Hippel-Lindau (VHL) protein, the substrate receptor of the Cullin2 (CUL2) E3 ligase complex, tethered to polypeptide binders that selectively bind and recruit endogenous target proteins to the CUL2-E3 ligase complex for ubiquitination and proteasomal degradation. By using synthetic monobodies that selectively bind the protein tyrosine phosphatase SHP2 and a camelid-derived VHH nanobody that selectively binds the human ASC protein, we demonstrate highly efficient AdPROM-mediated degradation of endogenous SHP2 and ASC in human cell lines. We show that AdPROM-mediated loss of SHP2 in cells impacts SHP2 biology. This study demonstrates for the first time that small polypeptide binders that selectively recognize endogenous target proteins can be exploited for AdPROM-mediated destruction of the target proteins.
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Affiliation(s)
- Luke J Fulcher
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, Dundee, UK
| | - Luke D Hutchinson
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, Dundee, UK
| | - Thomas J Macartney
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, Dundee, UK
| | - Craig Turnbull
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, Dundee, UK
| | - Gopal P Sapkota
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, Dundee, UK
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16
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Rational development of Stafib-2: a selective, nanomolar inhibitor of the transcription factor STAT5b. Sci Rep 2017; 7:819. [PMID: 28400581 PMCID: PMC5429769 DOI: 10.1038/s41598-017-00920-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 03/10/2017] [Indexed: 11/09/2022] Open
Abstract
The transcription factor STAT5b is a target for tumour therapy. We recently reported catechol bisphosphate and derivatives such as Stafib-1 as the first selective inhibitors of the STAT5b SH2 domain. Here, we demonstrate STAT5b binding of catechol bisphosphate by solid-state nuclear magnetic resonance, and report on rational optimization of Stafib-1 (Ki = 44 nM) to Stafib-2 (Ki = 9 nM). The binding site of Stafib-2 was validated using combined isothermal titration calorimetry (ITC) and protein point mutant analysis, representing the first time that functional comparison of wild-type versus mutant protein by ITC has been used to characterize the binding site of a small-molecule ligand of a STAT protein with amino acid resolution. The prodrug Pomstafib-2 selectively inhibits tyrosine phosphorylation of STAT5b in human leukaemia cells and induces apoptosis in a STAT5-dependent manner. We propose Pomstafib-2, which currently represents the most active, selective inhibitor of STAT5b activation available, as a chemical tool for addressing the fundamental question of which roles the different STAT5 proteins play in various cell processes.
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17
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Liang X, Zang J, Zhu M, Gao Q, Wang B, Xu W, Zhang Y. Design, Synthesis, and Antitumor Evaluation of 4-Amino-(1 H)-pyrazole Derivatives as JAKs Inhibitors. ACS Med Chem Lett 2016; 7:950-955. [PMID: 27774135 DOI: 10.1021/acsmedchemlett.6b00247] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 08/23/2016] [Indexed: 01/29/2023] Open
Abstract
Abnormalities in the JAK/STAT signaling pathway lead to many diseases such as immunodeficiency, inflammation, and cancer. Herein, we designed and synthesized a series of 4-amino-(1H)-pyrazole derivatives as potent JAKs inhibitors for cancer treatment. Results from in vitro protein kinase inhibition experiments indicated that compounds 3a-f and 11b are potent JAKs inhibitors. For example, the IC50 values of compound 3f against JAK1, JAK2, and JAK3 were 3.4, 2.2, and 3.5 nM, respectively. In cell culture experiments, compound 3f showed potent antiproliferative activity against various cell lines (PC-3, HEL, K562, MCF-7, and MOLT4) at low micromolar levels, while compound 11b showed selective cytotoxicity at submicromolar levels against HEL (IC50: 0.35 μM) and K562 (IC50: 0.37 μM) cell lines. It is worth noting that both 3f and 11b showed more potent antiproliferative activities than the approved JAKs inhibitor Ruxolitinib.
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Affiliation(s)
- Xuewu Liang
- Department
of Medicinal Chemistry, School of Pharmacy, Shandong University, Ji’nan, Shandong 250012, P. R. China
| | - Jie Zang
- Department
of Medicinal Chemistry, School of Pharmacy, Shandong University, Ji’nan, Shandong 250012, P. R. China
| | - Mengyuan Zhu
- Department
of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Qianwen Gao
- Department
of Medicinal Chemistry, School of Pharmacy, Shandong University, Ji’nan, Shandong 250012, P. R. China
| | - Binghe Wang
- Department
of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Wenfang Xu
- Department
of Medicinal Chemistry, School of Pharmacy, Shandong University, Ji’nan, Shandong 250012, P. R. China
| | - Yingjie Zhang
- Department
of Medicinal Chemistry, School of Pharmacy, Shandong University, Ji’nan, Shandong 250012, P. R. China
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18
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Lin Z, Jiang J, Liu XS. Ursolic acid-mediated apoptosis of K562 cells involves Stat5/Akt pathway inhibition through the induction of Gfi-1. Sci Rep 2016; 6:33358. [PMID: 27634378 PMCID: PMC5025887 DOI: 10.1038/srep33358] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 08/25/2016] [Indexed: 02/05/2023] Open
Abstract
Ursolic acid (UA) is a promising natural compound for cancer prevention and therapy. We previously reported that UA induced apoptosis in CML-derived K562 cells. Here we show that the apoptotic process is accompanied by down-regulation of Bcl-xL and Mcl-1 expression and dephosphorylation of Bad. These events are associated with Stat5 inhibition, which is partially mediated through elevated expression of transcriptional repressor Gfi-1. Gfi-1 knockdown using siRNA abrogates the ability of UA to decrease Stat5b expression and attenuates apoptosis induction by UA. We also demonstrate that UA suppresses the Akt kinase activity by inhibiting Akt1/2 expression, which correlates with Stat5 inhibition. Stat5 activity inhibited by a chemical inhibitor or siRNA, Akt1/2 mRNA expression is suppressed. Moreover, we show that UA exerts growth-inhibition in Imatinib-resistant K562/G01. UA has synergistic effects when used in combination with Imatinib in both K562 and K562/G01. Altogether, the data provide evidence that UA's pro-apoptotic effect in K562 cells is associated with the Gfi-1/Stat5/Akt pathway. The findings indicate that UA could potentially be a useful agent in the treatment of CML.
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Affiliation(s)
- Ze Lin
- Department of Biochemistry, Shantou University Medical College, No. 22 Xinlin Road, Jinping District, Shantou, 510451, China
| | - Jikai Jiang
- Department of Biochemistry, Shantou University Medical College, No. 22 Xinlin Road, Jinping District, Shantou, 510451, China
| | - Xiao-Shan Liu
- Department of Biochemistry, Guangzhou Medical University, Xinzao Town, Panyu District, Guangzhou 511436, China
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19
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Yu C, Yang Q, Chen Y, Wang D, Levine R, Crispino J, Wen Q, Huang Z. Tyrosine 625 plays a key role and cooperates with tyrosine 630 in MPL W515L-induced signaling and myeloproliferative neoplasms. Cell Biosci 2016; 6:34. [PMID: 27222706 PMCID: PMC4877759 DOI: 10.1186/s13578-016-0097-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Accepted: 04/21/2016] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Myeloproliferative neoplasms (MPN) are a group of blood cancers that boost normal blood cell production in the bone marrow. Abnormal mutations in stem cells were found accompanying with the occurrence of MPN. It has been shown that MPL mutations (MPL W515L or MPL W515K) were involved in patients with MPN. Since tyrosine residues 625 and 630 mediate normal MPL signaling, whether them affect MPL W515L-induced myeloproliferative neoplasms (MPNs) is unknown. RESULTS In this study, we further tested their functions in MPL W515L-induced myeloproliferative neoplasms (MPNs) by substituting either or both of them with phenylalanine in MPL W515L (termed as MPL515/625, MPL515/630 and MPL515/625/630, respectively). In vitro, MPL515/630 but not MPL515/625 or MPL515/625/630 retained the ability to induce TPO-independent proliferation and increase colony-forming unit megakaryocytes (CFU-Mk). Accordingly, differential activation of the downstream signaling by four mutants was observed and constitutively active STAT5 or AKT instead of STAT3 partially compensated MPL515/625/630 function. Further support this, STAT5-deficiency impaired MPL W515L-induced CFU-Mk expansion. In vivo, MPL515/630 but not MPL515/625 or MPL515/625/630 induced typical features of MPNs with high WBC and platelet counts, splenomegaly, hepatomegaly and hypercellularity in the bone marrow. Surprisingly, MPL515/625 also caused hypercellularity of bone marrow and splenomegaly without any other significant features. We also observed differential effects of the four mutants on progenitors, myeloid cells and megakaryocytes. CONCLUSIONS Our studies have revealed distinct features of tyrosine sites 625 and 630 in mediating MPL W515L-induced megakaryocyte hyperproliferation and MPNs. Our study also suggests that MPL cytosolic phosphorylated Y625 and flanking amino acids could become targets for pharmacologic inhibition in MPNs.
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Affiliation(s)
- Chunjie Yu
- College of Life Sciences, Wuhan University, 16 Luo-Jia-Shan Road, Wuhan, 430072 Hubei People's Republic of China
| | - Qiong Yang
- Feinberg School of Medicine, Department of Medicine, Division of Hematology and Oncology, Northwestern University, 303 E Superior Street, Lurie Research Building 5-250D, Chicago, IL 60611 USA
| | - Yuhong Chen
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, WI 53226 USA
| | - Demin Wang
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, WI 53226 USA
| | - Ross Levine
- Human Oncology Program and Pathogenesis Program and Leukemia Service, Department of Medicine, Memorial Sloan Kettering, New York, NY USA
| | - John Crispino
- Feinberg School of Medicine, Department of Medicine, Division of Hematology and Oncology, Northwestern University, 303 E Superior Street, Lurie Research Building 5-250D, Chicago, IL 60611 USA
| | - Qiang Wen
- Feinberg School of Medicine, Department of Medicine, Division of Hematology and Oncology, Northwestern University, 303 E Superior Street, Lurie Research Building 5-250D, Chicago, IL 60611 USA
| | - Zan Huang
- College of Life Sciences, Wuhan University, 16 Luo-Jia-Shan Road, Wuhan, 430072 Hubei People's Republic of China
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20
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Pinz S, Unser S, Rascle A. Signal transducer and activator of transcription STAT5 is recruited to c-Myc super-enhancer. BMC Mol Biol 2016; 17:10. [PMID: 27074708 PMCID: PMC4831086 DOI: 10.1186/s12867-016-0063-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 04/07/2016] [Indexed: 11/10/2022] Open
Abstract
Background c-Myc has been proposed as a putative target gene of signal transducer and activator of transcription 5 (STAT5). No functional STAT5 binding site has been identified so far within the c-Myc gene locus, therefore a direct transcriptional regulation by STAT5 remains uncertain. c-Myc super-enhancer, located 1.7 Mb downstream of the c-Myc gene locus, was recently reported as essential for the regulation of c-Myc gene expression by hematopoietic transcription factors and bromodomain and extra-terminal (BET) proteins and for leukemia maintenance. c-Myc super-enhancer is composed of five regulatory regions (E1–E5) which recruit transcription and chromatin-associated factors, mediating chromatin looping and interaction with the c-Myc promoter. Results We now show that STAT5 strongly binds to c-Myc super-enhancer regions E3 and E4, both in normal and transformed Ba/F3 cells. We also found that the BET protein bromodomain-containing protein 2 (BRD2), a co-factor of STAT5, co-localizes with STAT5 at E3/E4 in Ba/F3 cells transformed by the constitutively active STAT5-1*6 mutant, but not in non-transformed Ba/F3 cells. BRD2 binding at E3/E4 coincides with c-Myc transcriptional activation and is lost upon treatment with deacetylase and BET inhibitors, both of which inhibit STAT5 transcriptional activity and c-Myc gene expression. Conclusions Our data suggest that constitutive STAT5 binding to c-Myc super-enhancer might contribute to BRD2 maintenance and thus allow sustained expression of c-Myc in Ba/F3 cells transformed by STAT5-1*6. Electronic supplementary material The online version of this article (doi:10.1186/s12867-016-0063-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Sophia Pinz
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053, Regensburg, Germany
| | - Samy Unser
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053, Regensburg, Germany
| | - Anne Rascle
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, 93053, Regensburg, Germany.
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21
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Wang J, Rouse C, Jasper JS, Pendergast AM. ABL kinases promote breast cancer osteolytic metastasis by modulating tumor-bone interactions through TAZ and STAT5 signaling. Sci Signal 2016; 9:ra12. [PMID: 26838548 DOI: 10.1126/scisignal.aad3210] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Bone metastases occur in up to 70% of advanced breast cancer. For most patients with breast cancer, bone metastases are predominantly osteolytic. Interactions between tumor cells and stromal cells in the bone microenvironment drive osteolytic bone metastasis, a process that requires the activation of osteoclasts, cells that break down bone. We report that ABL kinases promoted metastasis of breast cancer cells to bone by regulating the crosstalk between tumor cells and the bone microenvironment. ABL kinases protected tumor cells from apoptosis induced by TRAIL (TNF-related apoptosis-inducing ligand), activated the transcription factor STAT5, and promoted osteolysis through the STAT5-dependent expression of genes encoding the osteoclast-activating factors interleukin-6 (IL-6) and matrix metalloproteinase 1 (MMP1). Furthermore, in breast cancer cells, ABL kinases increased the abundance of the Hippo pathway mediator TAZ and the expression of TAZ-dependent target genes that promote bone metastasis. Knockdown of ABL kinases or treatment with ABL-specific allosteric inhibitor impaired osteolytic metastasis of breast cancer cells in mice. These findings revealed a role for ABL kinases in regulating tumor-bone interactions and provide a rationale for using ABL-specific inhibitors to limit breast cancer metastasis to bone.
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Affiliation(s)
- Jun Wang
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Clay Rouse
- Division of Laboratory Animal Resources, Duke University School of Medicine, Durham, NC 27710, USA
| | - Jeff S Jasper
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Ann Marie Pendergast
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC 27710, USA.
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22
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Romagnoli R, Baraldi PG, Prencipe F, Lopez-Cara C, Rondanin R, Simoni D, Hamel E, Grimaudo S, Pipitone RM, Meli M, Tolomeo M. Novel iodoacetamido benzoheterocyclic derivatives with potent antileukemic activity are inhibitors of STAT5 phosphorylation. Eur J Med Chem 2016; 108:39-52. [PMID: 26629859 PMCID: PMC4724257 DOI: 10.1016/j.ejmech.2015.11.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 11/06/2015] [Accepted: 11/16/2015] [Indexed: 12/29/2022]
Abstract
Signal Transducer and Activator of Transcription 5 (STAT5) protein, a component of the STAT family of signaling proteins, is considered to be an attractive therapeutic target because of its involvement in the progression of acute myeloid leukemia. In an effort to discover potent molecules able to inhibit the phosphorylation-activation of STAT5, twenty-two compounds were synthesized and evaluated on the basis of our knowledge of the activity of 2-(3',4',5'-trimethoxybenzoyl)-3-iodoacetamido-6-methoxy benzo[b]furan derivative 1 as a potent STAT5 inhibitor. Most of these molecules, structurally related to compound 1, were characterized by the presence of a common 3',4',5'-trimethoxybenzoyl moiety at the 2-position of different benzoheterocycles such as benzo[b]furan, benzo[b]thiophene, indole and N-methylindole. Effects on biological activity of the iodoacetamido group and of different moieties (methyl and methoxy) at the C-3 to C-7 positions were examined. In the series of benzo[b]furan derivatives, moving the iodoacetylamino group from the C-4 to the C-5 or C-6 positions did not significantly affect antiproliferative activity. Compounds 4, 15, 20 and 23 blocked STAT5 signals and induced apoptosis of K562 BCR-ABL positive cells. For compound 23, the trimethoxybenzoyl moiety at the 2-position of the benzo[b]furan core was not essential for potent inhibition of STAT5 activation.
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Affiliation(s)
- Romeo Romagnoli
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara, 44121 Ferrara, Italy.
| | - Pier Giovanni Baraldi
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara, 44121 Ferrara, Italy
| | - Filippo Prencipe
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara, 44121 Ferrara, Italy
| | - Carlota Lopez-Cara
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara, 44121 Ferrara, Italy
| | - Riccardo Rondanin
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara, 44121 Ferrara, Italy
| | - Daniele Simoni
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara, 44121 Ferrara, Italy
| | - Ernest Hamel
- Screening Technologies Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, Frederick National Laboratory for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD 21702, USA
| | - Stefania Grimaudo
- Dipartimento Biomedico di Medicina Interna e Specialistica, Università di Palermo, 90125 Palermo, Italy
| | - Rosaria Maria Pipitone
- Dipartimento Biomedico di Medicina Interna e Specialistica, Università di Palermo, 90125 Palermo, Italy
| | - Maria Meli
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile, Area di Farmacologia, Università di Palermo, 90125 Palermo, Italy
| | - Manlio Tolomeo
- Centro Interdipartimentale di Ricerca in Oncologia Clinica e Dipartimento Biomedico di Medicina Interna e Specialistica, Sezione di Malattie Infettive, Università di Palermo, 90125 Palermo, Italy
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Elumalai N, Berg A, Rubner S, Berg T. Phosphorylation of Capsaicinoid Derivatives Provides Highly Potent and Selective Inhibitors of the Transcription Factor STAT5b. ACS Chem Biol 2015; 10:2884-90. [PMID: 26469307 DOI: 10.1021/acschembio.5b00817] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Design approaches for inhibitors of protein-protein interactions are rare, but highly sought after. Here, we report that O-phosphorylation of simple derivatives of the natural products dihydrocapsaicin and N-vanillylnonanamide leads to inhibitors of the SH2 domain of the transcription factor STAT5b. The most potent molecule is obtained from dihydrocapsaicin in only three synthetic steps. It has submicromolar affinity for the SH2 domain of STAT5b (Ki = 0.34 μM), while displaying 35-fold selectivity over the highly homologous STAT5a (Ki = 13.0 μM). The corresponding pivaloyloxymethyl ester inhibits STAT5b with selectivity over STAT5a in human tumor cells. Importantly, it inhibits cell viability and induces apoptosis in human tumor cells in a STAT5-dependent manner. Our data validate O-phosphorylation of appropriately preselected natural products or natural product derivatives as a semirational design approach for small molecules that selectively inhibit phosphorylation-dependent protein-protein interaction domains in cultured human tumor cells.
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Affiliation(s)
- Nagarajan Elumalai
- Institute
of Organic Chemistry, University of Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Angela Berg
- Institute
of Organic Chemistry, University of Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Stefan Rubner
- Institute
of Organic Chemistry, University of Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Thorsten Berg
- Institute
of Organic Chemistry, University of Leipzig, Johannisallee 29, 04103 Leipzig, Germany
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24
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Inhibition of Ras-mediated signaling pathways in CML stem cells. Cell Oncol (Dordr) 2015; 38:407-18. [PMID: 26458816 DOI: 10.1007/s13402-015-0248-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2015] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Chronic myeloid leukemia (CML) is a clonal myeloproliferative disorder characterized by the presence of the BCR-ABL1 oncoprotein in cells with a hematopoietic stem cell (HSC) origin. BCR-ABL1 tyrosine kinase activity leads to constitutive activation of Ras, which in turn acts as a branch point to initiate multiple downstream signaling pathways governing proliferation, self-renewal, differentiation and apoptosis. As aberrant regulation of these cellular processes causes transformation and disease progression particularly in advanced stages of CML, investigation of these signaling pathways may uncover new therapeutic targets for the selective eradication of CML stem cells. Transcription factors play a crucial role in unbalancing the Ras signaling network and have recently been investigated as potential modulators in this regard. In this review, we first briefly summarize the Ras-associated molecular pathways that are involved in the regulation of CML stem cell properties. Next we discuss the relevance of Ras-associated transcription factors as nuclear targets in combination treatment strategies for CML. CONCLUSIONS A closer investigation of the influence of Ras-mediated signaling pathways on CML progression to blast crisis is warranted to uncover new directions for targeted therapies, particularly in cases that are resistant to current tyrosine kinase inhibitors.
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25
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Liao Z, Gu L, Vergalli J, Mariani SA, De Dominici M, Lokareddy RK, Dagvadorj A, Purushottamachar P, McCue PA, Trabulsi E, Lallas CD, Gupta S, Ellsworth E, Blackmon S, Ertel A, Fortina P, Leiby B, Xia G, Rui H, Hoang DT, Gomella LG, Cingolani G, Njar V, Pattabiraman N, Calabretta B, Nevalainen MT. Structure-Based Screen Identifies a Potent Small Molecule Inhibitor of Stat5a/b with Therapeutic Potential for Prostate Cancer and Chronic Myeloid Leukemia. Mol Cancer Ther 2015; 14:1777-93. [PMID: 26026053 DOI: 10.1158/1535-7163.mct-14-0883] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 04/15/2015] [Indexed: 11/16/2022]
Abstract
Bypassing tyrosine kinases responsible for Stat5a/b phosphorylation would be advantageous for therapy development for Stat5a/b-regulated cancers. Here, we sought to identify small molecule inhibitors of Stat5a/b for lead optimization and therapy development for prostate cancer and Bcr-Abl-driven leukemias. In silico screening of chemical structure databases combined with medicinal chemistry was used for identification of a panel of small molecule inhibitors to block SH2 domain-mediated docking of Stat5a/b to the receptor-kinase complex and subsequent phosphorylation and dimerization. We tested the efficacy of the lead compound IST5-002 in experimental models and patient samples of two known Stat5a/b-driven cancers, prostate cancer and chronic myeloid leukemia (CML). The lead compound inhibitor of Stat5-002 (IST5-002) prevented both Jak2 and Bcr-Abl-mediated phosphorylation and dimerization of Stat5a/b, and selectively inhibited transcriptional activity of Stat5a (IC50 = 1.5μmol/L) and Stat5b (IC50 = 3.5 μmol/L). IST5-002 suppressed nuclear translocation of Stat5a/b, binding to DNA and Stat5a/b target gene expression. IST5-002 induced extensive apoptosis of prostate cancer cells, impaired growth of prostate cancer xenograft tumors, and induced cell death in patient-derived prostate cancers when tested ex vivo in explant organ cultures. Importantly, IST5-002 induced robust apoptotic death not only of imatinib-sensitive but also of imatinib-resistant CML cell lines and primary CML cells from patients. IST5-002 provides a lead structure for further chemical modifications for clinical development for Stat5a/b-driven solid tumors and hematologic malignancies.
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Affiliation(s)
- Zhiyong Liao
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Lei Gu
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Jenny Vergalli
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Samanta A Mariani
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Marco De Dominici
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Ravi K Lokareddy
- Department of Biochemistry, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Ayush Dagvadorj
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Puranik Purushottamachar
- School of Pharmacy, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Peter A McCue
- Department of Pathology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Edouard Trabulsi
- Department of Urology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Costas D Lallas
- Department of Urology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Shilpa Gupta
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania. Department of Medical Oncology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Elyse Ellsworth
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Shauna Blackmon
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Adam Ertel
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Paolo Fortina
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Benjamin Leiby
- Division of Biostatistics, Department of Pharmacology and Experimental Therapeutics, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Guanjun Xia
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Hallgeir Rui
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania. Department of Pathology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania. Department of Medical Oncology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - David T Hoang
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Leonard G Gomella
- Department of Urology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Gino Cingolani
- Department of Biochemistry, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Vincent Njar
- School of Pharmacy, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Nagarajan Pattabiraman
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania. Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia
| | - Bruno Calabretta
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Marja T Nevalainen
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania. Department of Urology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania. Department of Medical Oncology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania.
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26
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Ay A, Gong D, Kahveci T. Hierarchical decomposition of dynamically evolving regulatory networks. BMC Bioinformatics 2015; 16:161. [PMID: 25976669 PMCID: PMC4450841 DOI: 10.1186/s12859-015-0529-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 03/09/2015] [Indexed: 02/07/2023] Open
Abstract
Background Gene regulatory networks describe the interplay between genes and their products. These networks control almost every biological activity in the cell through interactions. The hierarchy of genes in these networks as defined by their interactions gives important insights into how these functions are governed. Accurately determining the hierarchy of genes is however a computationally difficult problem. This problem is further complicated by the fact that an intrinsic characteristic of regulatory networks is that the wiring of interactions can change over time. Determining how the hierarchy in the gene regulatory networks changes with dynamically evolving network topology remains to be an unsolved challenge. Results In this study, we develop a new method, named D-HIDEN (Dynamic-HIerarchical DEcomposition of Networks) to find the hierarchy of the genes in dynamically evolving gene regulatory network topologies. Unlike earlier methods, which recompute the hierarchy from scratch when the network topology changes, our method adapts the hierarchy based on the wiring of the interactions only for the nodes which have the potential to move in the hierarchy. Conclusions We compare D-HIDEN to five currently available hierarchical decomposition methods on synthetic and real gene regulatory networks. Our experiments demonstrate that D-HIDEN significantly outperforms existing methods in running time, accuracy, or both. Furthermore, our method is robust against dynamic changes in hierarchy. Our experiments on human gene regulatory networks suggest that our method may be used to reconstruct hierarchy in gene regulatory networks.
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Affiliation(s)
- Ahmet Ay
- Departments of Biology and Mathematics, Colgate University, Hamilton, 13346, NY, USA.
| | - Dihong Gong
- Department of Computer and Information Science and Engineering, University of Florida, Gainesville, 32611, FL, USA.
| | - Tamer Kahveci
- Department of Computer and Information Science and Engineering, University of Florida, Gainesville, 32611, FL, USA.
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27
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Schepers H, Wierenga ATJ, Vellenga E, Schuringa JJ. STAT5-mediated self-renewal of normal hematopoietic and leukemic stem cells. JAKSTAT 2014; 1:13-22. [PMID: 24058747 PMCID: PMC3670129 DOI: 10.4161/jkst.19316] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 01/10/2012] [Accepted: 01/11/2012] [Indexed: 01/07/2023] Open
Abstract
The level of transcription factor activity critically regulates cell fate decisions such as hematopoietic stem cell self-renewal and differentiation. The balance between hematopoietic stem cell self-renewal and differentiation needs to be tightly controlled, as a shift toward differentiation might exhaust the stem cell pool, while a shift toward self-renewal might mark the onset of leukemic transformation. A number of transcription factors have been proposed to be critically involved in governing stem cell fate and lineage commitment, such as Hox transcription factors, c-Myc, Notch1, β-catenin, C/ebpα, Pu.1 and STAT5. It is therefore no surprise that dysregulation of these transcription factors can also contribute to the development of leukemias. This review will discuss the role of STAT5 in both normal and leukemic hematopoietic stem cells as well as mechanisms by which STAT5 might contribute to the development of human leukemias.
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Affiliation(s)
- Hein Schepers
- Department of Experimental Hematology; University Medical Center Groningen; Groningen, The Netherlands ; Department of Stem Cell Biology; University Medical Center Groningen; Groningen, The Netherlands
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28
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Pinz S, Unser S, Rascle A. The natural chemopreventive agent sulforaphane inhibits STAT5 activity. PLoS One 2014; 9:e99391. [PMID: 24910998 PMCID: PMC4051870 DOI: 10.1371/journal.pone.0099391] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Accepted: 05/14/2014] [Indexed: 12/21/2022] Open
Abstract
Signal transducer and activator of transcription STAT5 is an essential mediator of cytokine, growth factor and hormone signaling. While its activity is tightly regulated in normal cells, its constitutive activation directly contributes to oncogenesis and is associated to a number of hematological and solid tumor cancers. We previously showed that deacetylase inhibitors can inhibit STAT5 transcriptional activity. We now investigated whether the dietary chemopreventive agent sulforaphane, known for its activity as deacetylase inhibitor, might also inhibit STAT5 activity and thus could act as a chemopreventive agent in STAT5-associated cancers. We describe here sulforaphane (SFN) as a novel STAT5 inhibitor. We showed that SFN, like the deacetylase inhibitor trichostatin A (TSA), can inhibit expression of STAT5 target genes in the B cell line Ba/F3, as well as in its transformed counterpart Ba/F3-1*6 and in the human leukemic cell line K562 both of which express a constitutively active form of STAT5. Similarly to TSA, SFN does not alter STAT5 initial activation by phosphorylation or binding to the promoter of specific target genes, in favor of a downstream transcriptional inhibitory effect. Chromatin immunoprecipitation assays revealed that, in contrast to TSA however, SFN only partially impaired the recruitment of RNA polymerase II at STAT5 target genes and did not alter histone H3 and H4 acetylation, suggesting an inhibitory mechanism distinct from that of TSA. Altogether, our data revealed that the natural compound sulforaphane can inhibit STAT5 downstream activity, and as such represents an attractive cancer chemoprotective agent targeting the STAT5 signaling pathway.
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Affiliation(s)
- Sophia Pinz
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, Regensburg, Germany
| | - Samy Unser
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, Regensburg, Germany
| | - Anne Rascle
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, Regensburg, Germany
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29
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Dorritie KA, Redner RL, Johnson DE. STAT transcription factors in normal and cancer stem cells. Adv Biol Regul 2014; 56:30-44. [PMID: 24931719 DOI: 10.1016/j.jbior.2014.05.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 05/21/2014] [Accepted: 05/22/2014] [Indexed: 01/02/2023]
Abstract
Signal transducer and activator of transcription proteins (STATs) play vital roles in the regulation of cellular proliferation and survival in normal hematopoietic cells, including hematopoietic stem cells. However, aberrant activation of STATs is commonly observed in a number of hematologic malignancies, and recent studies indicate that targeting of STATs may have therapeutic benefit in these diseases. Additional studies have provided greater understanding of the cells responsible for leukemia initiation, referred to as leukemia stem cells. Emerging evidence indicates that STATs are important in maintaining leukemia stem cells and represent a promising target for eradication of this dangerous cell population. Here we summarize what is known about normal hematopoietic stem cells and the origin of leukemic stem cells. We further describe the roles of STAT proteins in these cell populations, as well as current progress toward the development of novel agents and strategies for targeting the STAT proteins.
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Affiliation(s)
- Kathleen A Dorritie
- Division of Hematology/Oncology, Department of Medicine, University of Pittsburgh, The University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA.
| | - Robert L Redner
- Division of Hematology/Oncology, Department of Medicine, University of Pittsburgh, The University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA
| | - Daniel E Johnson
- Division of Hematology/Oncology, Department of Medicine, University of Pittsburgh, The University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA; Department of Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
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30
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Bu Q, Cui L, Li J, Du X, Zou W, Ding K, Pan J. SAHA and S116836, a novel tyrosine kinase inhibitor, synergistically induce apoptosis in imatinib-resistant chronic myelogenous leukemia cells. Cancer Biol Ther 2014; 15:951-62. [PMID: 24759597 DOI: 10.4161/cbt.28931] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Limited treatment options are available for chronic myelogenous leukemia (CML) patients who develop imatinib mesylate (IM) resistance. Here we proposed a novel combination regimen, a co-administration of S116836, a novel small molecule multi-targeted tyrosine kinase inhibitor that was synthesized by rational design, and histone deacetylases inhibitor (HDACi) suberoylanilide hydroxamic acid (SAHA), to overcome IM resistance in CML. S116836 at low concentrations used in the present study mildly downregulates auto-tyrosine phosphorylation of Bcr-Abl. SAHA, an FDA-approved HDACi drug, at 1 μM has modest anti-tumor activity in treating CML. However, we found a synergistic interaction between SAHA and S116836 in Bcr-Abl-positive CML cells that were sensitive or resistant to IM. Exposure of KBM5 and KBM5-T315I cells to minimal or non-toxic concentrations of SAHA and S116836 synergistically reduced cell viability and induced cell death. Co-treatment with SAHA and S116838 repressed the expressions of anti-apoptosis proteins, such as Mcl-1 and XIAP, but promoted Bim expression and mitochondrial damage. Of importance, treatment with both drugs significantly reduced cell viability of primary human CML cells, as compared with either agent alone. Taken together, our findings suggest that SAHA exerts synergistically with S116836 at a non-toxic concentration to promote apoptosis in the CML, including those resistant to imatinib or dasatinib.
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Affiliation(s)
- Qiangui Bu
- Department of Pathophysiology; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou, PR China
| | - Lijing Cui
- Department of Pathophysiology; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou, PR China
| | - Juan Li
- Department of Hematology; The First Affiliated Hospital; Sun Yat-sen University; Guangzhou, PR China
| | - Xin Du
- Department of Hematology; Guangdong Provincial People's Hospital; Guangzhou, PR China
| | - Waiyi Zou
- Department of Hematology; The First Affiliated Hospital; Sun Yat-sen University; Guangzhou, PR China
| | - Ke Ding
- Key Laboratory of Regenerative Biology and Institute of Chemical Biology; Guangzhou Institute of Biomedicine and Health; Chinese Academy of Sciences; Guangzhou, PR China
| | - Jingxuan Pan
- Department of Pathophysiology; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou, PR China; State Key Laboratory of Ophthalmology; Zhongshan Ophthalmic Center; Sun Yat-sen University; Guangzhou, PR China; Collaborative Innovation Center for Cancer Medicine; State Key Laboratory of Oncology in South China; Sun Yat-Sen University Cancer Center; Guangzhou, PR China
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31
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Pinz S, Unser S, Brueggemann S, Besl E, Al-Rifai N, Petkes H, Amslinger S, Rascle A. The synthetic α-bromo-2',3,4,4'-tetramethoxychalcone (α-Br-TMC) inhibits the JAK/STAT signaling pathway. PLoS One 2014; 9:e90275. [PMID: 24595334 PMCID: PMC3940872 DOI: 10.1371/journal.pone.0090275] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Accepted: 01/27/2014] [Indexed: 11/30/2022] Open
Abstract
Signal transducer and activator of transcription STAT5 and its upstream activating kinase JAK2 are essential mediators of cytokine signaling. Their activity is normally tightly regulated and transient. However, constitutive activation of STAT5 is found in numerous cancers and a driving force for malignant transformation. We describe here the identification of the synthetic chalcone α-Br-2′,3,4,4′-tetramethoxychalcone (α-Br-TMC) as a novel JAK/STAT inhibitor. Using the non-transformed IL-3-dependent B cell line Ba/F3 and its oncogenic derivative Ba/F3-1*6 expressing constitutively activated STAT5, we show that α-Br-TMC targets the JAK/STAT pathway at multiple levels, inhibiting both JAK2 and STAT5 phosphorylation. Moreover, α-Br-TMC alters the mobility of STAT5A/B proteins in SDS-PAGE, indicating a change in their post-translational modification state. These alterations correlate with a decreased association of STAT5 and RNA polymerase II with STAT5 target genes in chromatin immunoprecipitation assays. Interestingly, expression of STAT5 target genes such as Cis and c-Myc was differentially regulated by α-Br-TMC in normal and cancer cells. While both genes were inhibited in IL-3-stimulated Ba/F3 cells, expression of the oncogene c-Myc was down-regulated and that of the tumor suppressor gene Cis was up-regulated in transformed Ba/F3-1*6 cells. The synthetic chalcone α-Br-TMC might therefore represent a promising novel anticancer agent for therapeutic intervention in STAT5-associated malignancies.
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Affiliation(s)
- Sophia Pinz
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, Regensburg, Germany
| | - Samy Unser
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, Regensburg, Germany
| | - Susanne Brueggemann
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, Regensburg, Germany
| | - Elisabeth Besl
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, Regensburg, Germany
| | - Nafisah Al-Rifai
- Institute of Organic Chemistry, University of Regensburg, Regensburg, Germany
| | - Hermina Petkes
- Institute of Organic Chemistry, University of Regensburg, Regensburg, Germany
| | - Sabine Amslinger
- Institute of Organic Chemistry, University of Regensburg, Regensburg, Germany
- * E-mail: (AR); (SA)
| | - Anne Rascle
- Stat5 Signaling Research Group, Institute of Immunology, University of Regensburg, Regensburg, Germany
- * E-mail: (AR); (SA)
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A novel STAT inhibitor, OPB-31121, has a significant antitumor effect on leukemia with STAT-addictive oncokinases. Blood Cancer J 2013; 3:e166. [PMID: 24292418 PMCID: PMC3880446 DOI: 10.1038/bcj.2013.63] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 09/19/2013] [Accepted: 10/04/2013] [Indexed: 12/03/2022] Open
Abstract
Signal transduction and activator of transcription (STAT) proteins are extracellular ligand-responsive transcription factors that mediate cell proliferation, apoptosis, differentiation, development and the immune response. Aberrant signals of STAT induce uncontrolled cell proliferation and apoptosis resistance and are strongly involved in cancer. STAT has been identified as a promising target for antitumor drugs, but to date most trials have not been successful. Here, we demonstrated that a novel STAT inhibitor, OPB-31121, strongly inhibited STAT3 and STAT5 phosphorylation without upstream kinase inhibition, and induced significant growth inhibition in various hematopoietic malignant cells. Investigation of various cell lines suggested that OPB-31121 is particularly effective against multiple myeloma, Burkitt lymphoma and leukemia harboring BCR–ABL, FLT3/ITD and JAK2 V617F, oncokinases with their oncogenicities dependent on STAT3/5. Using an immunodeficient mouse transplantation system, we showed the significant antitumor effect of OPB-31121 against primary human leukemia cells harboring these aberrant kinases and its safety for normal human cord blood cells. Finally, we demonstrated a model to overcome drug resistance to upstream kinase inhibitors with a STAT inhibitor. These results suggested that OPB-31121 is a promising antitumor drug. Phase I trials have been performed in Korea and Hong Kong, and a phase I/II trial is underway in Japan.
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33
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JAK of all trades: JAK2-STAT5 as novel therapeutic targets in BCR-ABL1+ chronic myeloid leukemia. Blood 2013; 122:2167-75. [PMID: 23926299 DOI: 10.1182/blood-2013-02-485573] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The transcription factor signal transducers and activators of transcription 5 (STAT5) has an important and unique role in Breakpoint Cluster Region - Abelson 1 (BCR-ABL1)-driven neoplasias. STAT5 is an essential component in the signaling network that maintains the survival and growth of chronic myeloid leukemia (CML) cells. In contrast, the function of the prototypical upstream kinase of STAT5, the Janus kinase JAK2, in CML is still under debate. Although there is widespread agreement that JAK2 is part of the signaling network downstream of BCR-ABL1, it is unclear whether and under what circumstances JAK2 inhibitors may be beneficial for CML patients. Recent studies in murine models have cast doubt on the importance of JAK2 in CML maintenance. Nevertheless, JAK2 has been proposed to have a central role in the cytokine signaling machinery that allows the survival of CML stem cells in the presence of BCR-ABL1 tyrosine kinase inhibitors. In this review, we summarize the current debate and provide an overview of the arguments on both sides of the fence. We present recent evidence showing that CML stem cells do not depend on BCR-ABL1 kinase activity but require the continuous support of the hematopoietic niche and its distinct cytokine environment and suggest that it has the potential to resolve the dispute.
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Retnakumari AP, Hanumanthu PL, Malarvizhi GL, Prabhu R, Sidharthan N, Thampi MV, Menon D, Mony U, Menon K, Keechilat P, Nair S, Koyakutty M. Rationally designed aberrant kinase-targeted endogenous protein nanomedicine against oncogene mutated/amplified refractory chronic myeloid leukemia. Mol Pharm 2012; 9:3062-78. [PMID: 22971013 DOI: 10.1021/mp300172e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Deregulated protein kinases play a very critical role in tumorigenesis, metastasis, and drug resistance of cancer. Although molecularly targeted small molecule kinase inhibitors (SMI) are effective against many types of cancer, point mutations in the kinase domain impart drug resistance, a major challenge in the clinic. A classic example is chronic myeloid leukemia (CML) caused by BCR-ABL fusion protein, wherein a BCR-ABL kinase inhibitor, imatinib (IM), was highly successful in the early chronic phase of the disease, but failed in the advanced stages due to amplification of oncogene or point mutations in the drug-binding site of kinase domain. Here, by identifying critical molecular pathways responsible for the drug-resistance in refractory CML patient samples and a model cell line, we have rationally designed an endogenous protein nanomedicine targeted to both cell surface receptors and aberrantly activated secondary kinase in the oncogenic network. Molecular diagnosis revealed that, in addition to point mutations and amplification of oncogenic BCR-ABL kinase, relapsed/refractory patients exhibited significant activation of STAT5 signaling with correlative overexpression of transferrin receptors (TfR) on the cell membrane. Accordingly, we have developed a human serum albumin (HSA) based nanomedicine, loaded with STAT5 inhibitor (sorafenib), and surface conjugated the same with holo-transferrin (Tf) ligands for TfR specific delivery. This dual-targeted "transferrin conjugated albumin bound sorafenib" nanomedicine (Tf-nAlb-Soraf), prepared using aqueous nanoprecipitation method, displayed uniform spherical morphology with average size of ∼150 nm and drug encapsulation efficiency of ∼74%. TfR specific uptake and enhanced antileukemic activity of the nanomedicine was found maximum in the most drug resistant patient sample having the highest level of STAT5 and TfR expression, thereby confirming the accuracy of our rational design and potential of dual-targeting approach. The nanomedicine induced downregulation of key survival pathways such as pSTAT5 and antiapoptotic protein MCL-1 was demonstrated using immunoblotting. This study reveals that, by implementing molecular diagnosis, personalized nanomedicines can be rationally designed and nanoengineered by imparting therapeutic functionality to endogenous proteins to overcome clinically important challenges like molecular drug resistance.
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Affiliation(s)
- Archana P Retnakumari
- Amrita Center for Nanosciences and Molecular Medicine, Amrita Vishwavidyapeetham University, Cochin, India
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Tiu R, Kalaycio M. Targeted therapy for patients with chronic myeloid leukemia: clinical trial experience and challenges in inter-trial comparisons. Leuk Lymphoma 2012; 53:1263-72. [PMID: 22149092 DOI: 10.3109/10428194.2011.647309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The treatment of chronic myeloid leukemia (CML) was revolutionized by the introduction of the targeted tyrosine kinase inhibitor (TKI) imatinib mesylate. Later, to improve efficacy and tolerability, the more potent TKIs dasatinib and nilotinib were evaluated in CML. Clinicians comparing the clinical efficacy of TKIs face considerable challenges, including the variable treatment histories of patients receiving second-line therapy. The aim of this review is to highlight the pitfalls and possible solutions for comparing efficacy across disparate CML trials. Comparison of efficacy across trials is aided by careful consideration of possible confounding factors, including treatment history, definitions of imatinib intolerance or resistance, and BCR-ABL mutational status at baseline. However, methods exist to improve the comparability of data from different trials, yielding a more clinically and statistically meaningful inter-trial comparison.
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Affiliation(s)
- Ramon Tiu
- Department of Hematologic Oncology and Blood Disorders, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 44195, USA
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Page BDG, Khoury H, Laister RC, Fletcher S, Vellozo M, Manzoli A, Yue P, Turkson J, Minden MD, Gunning PT. Small molecule STAT5-SH2 domain inhibitors exhibit potent antileukemia activity. J Med Chem 2012; 55:1047-55. [PMID: 22148584 DOI: 10.1021/jm200720n] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A growing body of evidence shows that Signal Transducer and Activator of Transcription 5 (STAT5) protein, a key member of the STAT family of signaling proteins, plays a pivotal role in the progression of many human cancers, including acute myeloid leukemia and prostate cancer. Unlike STAT3, where significant medicinal effort has been expended to identify potent direct inhibitors, Stat5 has been poorly investigated as a molecular therapeutic target. Thus, in an effort to identify direct inhibitors of STAT5 protein, we conducted an in vitro screen of a focused library of SH2 domain binding salicylic acid-containing inhibitors (∼150) against STAT5, as well as against STAT3 and STAT1 proteins for SH2 domain selectivity. We herein report the identification of several potent (K(i) < 5 μM) and STAT5 selective (>3-fold specificity for STAT5 cf. STAT1 and STAT3) inhibitors, BP-1-107, BP-1-108, SF-1-087, and SF-1-088. Lead agents, evaluated in K562 and MV-4-11 human leukemia cells, showed potent induction of apoptosis (IC(50)'s ∼ 20 μM) which correlated with potent and selective suppression of STAT5 phosphorylation, as well as inhibition of STAT5 target genes cyclin D1, cyclin D2, C-MYC, and MCL-1. Moreover, lead agent BP-1-108 showed negligible cytotoxic effects in normal bone marrow cells not expressing activated STAT5 protein. Inhibitors identified in this study represent some of the most potent direct small molecule, nonphosphorylated inhibitors of STAT5 to date.
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Affiliation(s)
- Brent D G Page
- Department of Chemistry, University of Toronto, 3359 Mississauga Road North, Mississauga, ON, L5L 1C6, Canada
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Zhong Y, Wu J, Chen B, Ma R, Cao H, Wang Z, Cheng L, Ding J, Feng J. Investigation and analysis of single nucleotide polymorphisms in Janus kinase/signal transducer and activator of transcription genes with leukemia. Leuk Lymphoma 2012; 53:1216-21. [PMID: 22126101 DOI: 10.3109/10428194.2011.645212] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Aberrant activation of the Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway may predispose to leukemia due to deregulation of proliferation, differentiation or apoptosis. This study was conducted to investigate whether any association exists between genetic polymorphisms in the JAK2, STAT3 and STAT5 genes and individual susceptibility to leukemia. A case-control study was carried out using a Chinese sample set with 344 cases of leukemia and 346 controls matched by age and ethnicity. Genomic DNA was assayed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF) on 13 single nucleotide polymorphisms (SNPs). Genotype analyses showed that two SNPs, namely rs17886724 and rs2293157 located in STAT3 and STAT5, respectively, were significantly associated with leukemia (p < 0.05 for all). Interaction analyses of SNPs (rs17886724|rs2293157; rs11079041| rs2293157) showed that there were inferior associations in chronic lymphocytic leukemia (CLL) and acute myeloid leukemia (AML) compared to the control group (0.1 > p > 0.05). Linkage disequilibrium existed between rs11079041 and rs2293157 in both leukemia and control groups (r(2) = 0.7). The haplotypes displayed significant association between rs11079041 and rs2293157 in both leukemia and control groups (p < 0.05). The accuracy rate of the support vector machine (SVM) classification model in making a prediction of leukemia was 97%. The results indicated that STAT3 and STAT5 gene SNPs may be prognostic of leukemia.
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Affiliation(s)
- Yuejiao Zhong
- Jiangsu Institute of Cancer Research, Nanjing, China
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Affinity-based proteomics reveal cancer-specific networks coordinated by Hsp90. Nat Chem Biol 2011; 7:818-26. [PMID: 21946277 DOI: 10.1038/nchembio.670] [Citation(s) in RCA: 210] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Accepted: 07/27/2011] [Indexed: 12/29/2022]
Abstract
Most cancers are characterized by multiple molecular alterations, but identification of the key proteins involved in these signaling pathways is currently beyond reach. We show that the inhibitor PU-H71 preferentially targets tumor-enriched Hsp90 complexes and affinity captures Hsp90-dependent oncogenic client proteins. We have used PU-H71 affinity capture to design a proteomic approach that, when combined with bioinformatic pathway analysis, identifies dysregulated signaling networks and key oncoproteins in chronic myeloid leukemia. The identified interactome overlaps with the well-characterized altered proteome in this cancer, indicating that this method can provide global insights into the biology of individual tumors, including primary patient specimens. In addition, we show that this approach can be used to identify previously uncharacterized oncoproteins and mechanisms, potentially leading to new targeted therapies. We further show that the abundance of the PU-H71-enriched Hsp90 species, which is not dictated by Hsp90 expression alone, is predictive of the cell's sensitivity to Hsp90 inhibition.
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Nakamura S, Yokota D, Tan L, Nagata Y, Takemura T, Hirano I, Shigeno K, Shibata K, Fujisawa S, Ohnishi K. Down-regulation of Thanatos-associated protein 11 by BCR-ABL promotes CML cell proliferation through c-Myc expression. Int J Cancer 2011; 130:1046-59. [PMID: 21400515 DOI: 10.1002/ijc.26065] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Revised: 01/27/2011] [Accepted: 02/23/2011] [Indexed: 11/09/2022]
Abstract
Bcr-Abl activates various signaling pathways in chronic myelogenous leukemia (CML) cells. The proliferation of Bcr-Abl transformed cells is promoted by c-Myc through the activation of Akt, JAK2 and NF-κB. However, the mechanism by which c-Myc regulates CML cell proliferation is unclear. In our study, we investigated the role of Thanatos-associated protein 11 (THAP11), which inhibits c-Myc transcription, in CML cell lines and in hematopoietic progenitor cells derived from CML patients. The induction of THAP11 expression by Abl kinase inhibitors in CML cell lines and in CML-derived hematopoietic progenitor cells resulted in the suppression of c-Myc. In addition, over-expression of THAP11 inhibited CML cell proliferation. In colony forming cells derived from CML-aldehyde dehydrogenase (ALDH)(hi) /CD34(+) cells, treatment with Abl kinase inhibitors and siRNA depletion of Bcr-Abl induced THAP11 expression and reduced c-Myc expression, resulting in inhibited colony formation. Moreover, overexpression of THAP11 significantly decreased the colony numbers, and also inhibited the expression of c-myc target genes such as Cyclin D1, ODC and induced the expression of p21(Cip1) . The depletion of THAP11 inhibited JAK2 or STAT5 inactivation-mediated c-Myc reduction in ALDH(hi) /CD34(+) CML cells. Thus, the induced THAP11 might be one of transcriptional regulators of c-Myc expression in CML cell. Therefore, the induction of THAP11 has a potential possibility as a target for the inhibition of CML cell proliferation.
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Affiliation(s)
- Satoki Nakamura
- Department of Internal Medicine III, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan.
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Stat3 signaling in acute myeloid leukemia: ligand-dependent and -independent activation and induction of apoptosis by a novel small-molecule Stat3 inhibitor. Blood 2011; 117:5701-9. [PMID: 21447830 DOI: 10.1182/blood-2010-04-280123] [Citation(s) in RCA: 185] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Acute myeloid leukemia (AML) is an aggressive malignancy with a relapse rate approaching 50%, despite aggressive chemotherapy. New therapies for AML are targeted at signal transduction pathways known to support blast survival, such as the Stat3 pathway. Aberrant activation of Stat3 has been demonstrated in many different malignancies, including AML, and this finding is frequently associated with more aggressive disease. The objectives of this study were: (1) to characterize Stat3 signaling patterns in AML cells lines and primary pediatric samples; and (2) to test the efficacy and potency of a novel Stat3 inhibitor in inducing apoptosis in AML cells. We found that Stat3 was constitutively activated in 6 of 7 AML cell lines and 6 of 18 primary pediatric AML samples. Moreover, constitutively phosphorylated Stat3 was frequent in samples with normal karyotype but uncommon in samples with t(8;21). Most cell lines and primary samples responded to G-CSF stimulation, although the sensitivity and magnitude of the response varied dramatically. Our novel small-molecule Stat3 inhibitor, C188-9, inhibited G-CSF-induced Stat3 phosphorylation, induced apoptosis in AML cell lines and primary samples, and inhibited AML blast colony formation with potencies in the low micromolar range. Therefore, Stat3 inhibition may be a valuable strategy for targeted therapies for AML.
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Abstract
Although only 5000 new cases of chronic myeloid leukemia (CML) were seen in the United States in 2009, this neoplasm continues to make scientific headlines year-after-year. Advances in understanding the molecular pathogenesis coupled with exciting developments in both drug design and development, targeting the initiating tyrosine kinase, have kept CML in the scientific limelight for more than a decade. Indeed, imatinib, a small-molecule inhibitor of the leukemia-initiating Bcr-Abl tyrosine kinase, has quickly become the therapeutic standard for newly diagnosed chronic phase-CML (CP-CML) patients. Yet, nearly one-third of patients will still have an inferior response to imatinib, either failing to respond to primary therapy or demonstrating progression after an initial response. Significant efforts geared toward understanding the molecular mechanisms of imatinib resistance have yielded valuable insights into the cellular biology of drug trafficking, enzyme structure and function, and the rational design of novel small molecule enzyme inhibitors. Indeed, new classes of kinase inhibitors have recently been investigated in imatinib-resistant CML. Understanding the pathogenesis of tyrosine kinase inhibitor resistance and the molecular rationale for the development of second and now third generation therapies for patients with CML will be keys to further disease control over the next 10 years.
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42
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Ferbeyre G, Moriggl R. The role of Stat5 transcription factors as tumor suppressors or oncogenes. Biochim Biophys Acta Rev Cancer 2010; 1815:104-14. [PMID: 20969928 DOI: 10.1016/j.bbcan.2010.10.004] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 10/08/2010] [Accepted: 10/08/2010] [Indexed: 02/06/2023]
Abstract
Stat5 is constitutively activated in many human cancers affecting the expression of cell proliferation and cell survival controlling genes. These oncogenic functions of Stat5 have been elegantly reproduced in mouse models. Aberrant Stat5 activity induces also mitochondrial dysfunction and reactive oxygen species leading to DNA damage. Although DNA damage can stimulate tumorigenesis, it can also prevent it. Stat5 can inhibit tumor progression like in the liver and it is a tumor suppressor in fibroblasts. Stat5 proteins are able to regulate cell differentiation and senescence activating the tumor suppressors SOCS1, p53 and PML. Understanding the context dependent regulation of tumorigenesis through Stat5 function will be central to understand proliferation, survival, differentiation or senescence of cancer cells.
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Affiliation(s)
- G Ferbeyre
- Département de Biochimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada.
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Kimura 木村丹香子 A, Martin C, Robinson GW, Simone JM, Chen W, Wickre MC, O'Shea JJ, Hennighausen L. The gene encoding the hematopoietic stem cell regulator CCN3/NOV is under direct cytokine control through the transcription factors STAT5A/B. J Biol Chem 2010; 285:32704-32709. [PMID: 20720003 DOI: 10.1074/jbc.m110.141804] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Cytokines control the biology of hematopoietic stem cells (HSCs) and progenitor cells in part through the transcription factors STAT5A/B. To investigate the target genes of STAT5A/B activated by cytokines in HSCs and progenitors, we performed microarray analyses using Lineage(-) Sca-1(+) c-Kit(+) (KSL) cells in the presence and absence of STAT5A/B. Stimulation with a mixture containing IL-3, IL-6, stem cell factor, thrombopoietin, and Flt3 ligand induced Ccn3/Nov mRNA over 100-fold in WT (control) but not Stat5a/b-null KSL cells. CCN3/NOV is a positive regulator of human HSC self-renewal and development of committed blood cells. Without stimulation, the Ccn3/Nov signal level was low in control KSL cells similar to Stat5a/b-null KSL cells. To determine which cytokine activates the Ccn3/Nov gene, we analyzed Lineage(-) c-Kit(+) (KL) and 32D cells using quantitative PCR and ChIP assays. Although stimulation with a mixture lacking IL-3 prevented the induction of Ccn3/Nov in control KL cells, IL-3 alone could induce Ccn3/Nov mRNA in control KL and 32D cells. ChIP assays using 32D cells revealed IL-3-induced binding of STAT5A/B to a γ-interferon-activated sequences site in the Ccn3/Nov gene promoter. This is the first report that Ccn3/Nov is directly induced by cytokines through STAT5A/B.
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Affiliation(s)
- Akiko Kimura 木村丹香子
- From the Laboratory of Genetics and Physiology, NIDDK, Bethesda, Maryland 20892.
| | - Cyril Martin
- From the Laboratory of Genetics and Physiology, NIDDK, Bethesda, Maryland 20892
| | - Gertraud W Robinson
- From the Laboratory of Genetics and Physiology, NIDDK, Bethesda, Maryland 20892
| | - James M Simone
- Flow Cytometry Section, Office of Science and Technology, NIAMS, Bethesda, Maryland 20892
| | - Weiping Chen
- Microarray Core Facility with the Genomic Core Laboratory, NIDDK, Bethesda, Maryland 20892
| | - Mark C Wickre
- From the Laboratory of Genetics and Physiology, NIDDK, Bethesda, Maryland 20892
| | - John J O'Shea
- Molecular Immunology and Inflammation Branch, NIAMS, National Institutes of Health, Bethesda, Maryland 20892
| | - Lothar Hennighausen
- From the Laboratory of Genetics and Physiology, NIDDK, Bethesda, Maryland 20892
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44
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Fang ZH, Dong CL, Chen Z, Zhou B, Liu N, Lan HF, Liang L, Liao WB, Zhang L, Han ZC. Transcriptional regulation of survivin by c-Myc in BCR/ABL-transformed cells: implications in anti-leukaemic strategy. J Cell Mol Med 2010; 13:2039-2052. [PMID: 19602047 DOI: 10.1111/j.1582-4934.2008.00549.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
BCR/ABL can cause chronic myelogenous leukaemia (CML) in part by altering the transcription of specific genes with growth- and/or survival-promoting functions. Recently, BCR/ABL has been shown to activate survivin, an important regulator of cell growth and survival, but the precise molecular mechanisms behind its expression and consequences thereof in CML cells remain unclear. Here, we reported that BCR/ABL promotes survivin expression and its cytoplasmic accumulation. The increase of survivin was largely controlled at the transcriptional level through a mechanism mediated by JAK2/PI3K signal pathways that activated c-Myc, leading to transactivation of survivin promoter. Dynamic down-regulation of survivin was a key event involved in imatinib-induced cell death while forced expression of survivin partially counteracted imatinib's effect on cell survival. Additionally, shRNA-mediated silencing of survivin or c-Myc eradicated colony formation of K562 cells in semi-solid culture system, implying an essential role for this transcriptional network in BCR/ABL-mediated cell transformation and survival. Finally, interruption of c-Myc activity by 10058-F4 exerted an anti-leukaemia effect with a synergistic interaction with imatinib and overcame the anti-apoptosis rescued by IL-3 supplement. In conclusion, we have identified JAK2/PI3K-mediated and c-Myc-dependent transactivation of survivin as a novel pathway in the transcriptional network orchestrated by BCR/ABL. These results suggest that the interference with this circuitry might be a potential utility for CML treatment.
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Affiliation(s)
- Zhi Hong Fang
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Chun Lan Dong
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Zhong Chen
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Bin Zhou
- Cardiology Department, Children's Hospital Boston, Harvard Medical School, Boston, MA, USA
| | - Na Liu
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Hai Feng Lan
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Lu Liang
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Wen Bin Liao
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Lei Zhang
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Zhong Chao Han
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Hospital of Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
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45
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Hoelbl A, Schuster C, Kovacic B, Zhu B, Wickre M, Hoelzl MA, Fajmann S, Grebien F, Warsch W, Stengl G, Hennighausen L, Poli V, Beug H, Moriggl R, Sexl V. Stat5 is indispensable for the maintenance of bcr/abl-positive leukaemia. EMBO Mol Med 2010; 2:98-110. [PMID: 20201032 PMCID: PMC2906698 DOI: 10.1002/emmm.201000062] [Citation(s) in RCA: 191] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Tumourigenesis caused by the Bcr/Abl oncoprotein is a multi-step process proceeding from initial to tumour-maintaining events and finally results in a complex tumour-supporting network. A key to successful cancer therapy is the identification of critical functional nodes in an oncogenic network required for disease maintenance. So far, the transcription factors Stat3 and Stat5a/b have been implicated in bcr/abl-induced initial transformation. However, to qualify as a potential drug target, a signalling pathway must be required for the maintenance of the leukaemic state. Data on the roles of Stat3 or Stat5a/b in leukaemia maintenance are elusive. Here, we show that both, Stat3 and Stat5 are necessary for initial transformation. However, Stat5- but not Stat3-deletion induces G0/G1 cell cycle arrest and apoptosis of imatinib-sensitive and imatinib-resistant stable leukaemic cells in vitro. Accordingly, Stat5-abrogation led to effective elimination of myeloid and lymphoid leukaemia maintenance in vivo. Hence, we identified Stat5 as a vulnerable point in the oncogenic network downstream of Bcr/Abl representing a case of non-oncogene addiction (NOA).
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Affiliation(s)
- Andrea Hoelbl
- Institute of Pharmacology, Centre of Biomolecular Medicine and Pharmacology, Medical University of Vienna, Austria
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46
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Ferrandiz N, Caraballo JM, Albajar M, Gomez-Casares MT, Lopez-Jorge CE, Blanco R, Delgado MD, Leon J. p21(Cip1) confers resistance to imatinib in human chronic myeloid leukemia cells. Cancer Lett 2009; 292:133-9. [PMID: 20042273 DOI: 10.1016/j.canlet.2009.11.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2009] [Revised: 11/11/2009] [Accepted: 11/27/2009] [Indexed: 11/24/2022]
Abstract
Imatinib is a Bcr-Abl inhibitor used as first-line therapy of chronic myeloid leukemia (CML). p21(Cip1), initially described as a cell cycle inhibitor, also protects from apoptosis in some models. We describe that imatinib down-regulates p21(Cip1) expression in CML cells. Using K562 cells with inducible p21 expression and transient transfections we found that p21 confers partial resistance to imatinib-induced apoptosis. This protection is not related to the G2-arrest provoked by p21, a decrease in the imatinib activity against Bcr-Abl or a cytoplasmic localization of p21. The results suggest an involvement of p21(Cip1) in the response to imatinib in CML.
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Affiliation(s)
- Nuria Ferrandiz
- Departamento de Biología Molecular, Facultad de Medicina, Instituto de Biomedicina y Biotecnología de Cantabria, Universidad de Cantabria-CSIC-IDICAN, Santander, Spain
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47
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Liao Z, Lutz J, Nevalainen MT. Transcription factor Stat5a/b as a therapeutic target protein for prostate cancer. Int J Biochem Cell Biol 2009; 42:186-92. [PMID: 19914392 DOI: 10.1016/j.biocel.2009.11.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2009] [Revised: 11/02/2009] [Accepted: 11/03/2009] [Indexed: 10/20/2022]
Abstract
Prostate cancer is the most common non-cutaneous cancer in Western males. The majority of prostate cancer fatalities are caused by development of castration-resistant growth and metastatic spread of the primary tumor. The average duration of the response of primary prostate cancer to hormonal ablation is less than 3 years, and 75% of prostate cancers in the United States progress to castration-resistant disease. The existing pharmacological therapies for metastatic and/or castration-resistant prostate cancer do not provide significant survival benefit. This review summarizes the importance of transcription factor Stat5 signaling in the pathogenesis of prostate cancer and discusses the molecular basis of Stat5a/b inhibition as a therapeutic strategy for prostate cancer.
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Affiliation(s)
- Zhiyong Liao
- Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University, 233 S. 10th Street, Philadelphia, PA 19107, USA
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48
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Masson K, Rönnstrand L. Oncogenic signaling from the hematopoietic growth factor receptors c-Kit and Flt3. Cell Signal 2009; 21:1717-26. [PMID: 19540337 DOI: 10.1016/j.cellsig.2009.06.002] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2009] [Revised: 06/04/2009] [Accepted: 06/09/2009] [Indexed: 01/01/2023]
Abstract
Signal transduction in response to growth factors is a strictly controlled process with networks of feedback systems, highly selective interactions and finely tuned on-and-off switches. In the context of cancer, detailed signaling studies have resulted in the development of some of the most frequently used means of therapy, with several well established examples such as the small molecule inhibitors imatinib and dasatinib in the treatment of chronic myeloid leukemia. Impaired function of receptor tyrosine kinases is implicated in various types of tumors, and much effort is put into mapping the many interactions and downstream pathways. Here we discuss the hematopoietic growth factor receptors c-Kit and Flt3 and their downstream signaling in normal as well as malignant cells. Both receptors are members of the same family of tyrosine kinases and crucial mediators of stem-and progenitor-cell proliferation and survival in response to ligand stimuli from the surrounding microenvironment. Gain-of-function mutations/alterations render the receptors constitutively and ligand-independently activated, resulting in aberrant signaling which is a crucial driving force in tumorigenesis. Frequently found mutations in c-Kit and Flt3 are point mutations of aspartic acid 816 and 835 respectively, in the activation loop of the kinase domains. Several other point mutations have been identified, but in the case of Flt3, the most common alterations are internal tandem duplications (ITDs) in the juxtamembrane region, reported in approximately 30% of patients with acute myeloid leukemia (AML). During the last couple of years, the increasing understanding of c-Kit and Flt3 signaling has also revealed the complexity of these receptor systems. The impact of gain-of-function mutations of c-Kit and Flt3 in different malignancies is well established and shown to be of clinical relevance in both prognosis and therapy. Many inhibitors of both c-Kit or Flt3 or of their downstream substrates are in clinical trials with encouraging results, and targeted therapy using a combination of such inhibitors is considered a promising approach for future treatments.
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Affiliation(s)
- Kristina Masson
- Experimental Clinical Chemistry, Wallenberg Laboratory, Department of Laboratory Medicine, Malmö University Hospital, Lund University, 20502 Malmö, Sweden
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49
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Shi P, Chandra J, Sun X, Gergely M, Cortes JE, Garcia-Manero G, Arlinghaus RB, Lai R, Amin HM. Inhibition of IGF-IR tyrosine kinase induces apoptosis and cell cycle arrest in imatinib-resistant chronic myeloid leukaemia cells. J Cell Mol Med 2009; 14:1777-92. [PMID: 19508387 PMCID: PMC3444523 DOI: 10.1111/j.1582-4934.2009.00795.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Although signalling through the type I insulin-like growth factor receptor (IGF-IR) maintains the survival of haematopoietic cells, a specific role of IGF-IR in haematological neoplasms remains largely unknown. Chronic myeloid leukaemia (CML) is the most common subtype of chronic myeloproliferative diseases. Typically, CML evolves as a chronic phase (CP) disease that progresses into accelerated (AP) and blast phase (BP) stages. In this study, we show that IGF-IR is universally expressed in four CML cell lines. IGF-IR was expressed in only 30% and 25% of CP and AP patients, respectively, but its frequency of expression increased to 73% of BP patients. Increased expression levels of IGF-IR with CML progression was supported by quantitative real-time PCR that demonstrated significantly higher levels of IGF-IR mRNA in BP patients. Inhibition of IGF-IR decreased the viability and proliferation of CML cell lines and abrogated their growth in soft agar. Importantly, inhibition of IGF-IR decreased the viability of cells resistant to imatinib mesylate including BaF3 cells transfected with p210 BCR-ABL mutants, CML cell lines and primary neoplastic cells from patients. The negative effects of inhibition of IGF-IR were attributable to apoptosis and cell cycle arrest due to alterations of downstream target proteins. Our findings suggest that IGF-IR could represent a potential molecular target particularly for advanced stage or imatinib-resistant cases.
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Affiliation(s)
- Ping Shi
- Department of Hematopathology, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
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50
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Yang SH, Chien CM, Su JC, Chen YL, Chang LS, Lin SR. Novel indoloquinoline derivative, IQDMA, inhibits STAT5 signaling associated with apoptosis in K562 cells. J Biochem Mol Toxicol 2009; 22:396-404. [PMID: 19111001 DOI: 10.1002/jbt.20254] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
N'-(11H-indolo[3,2-c]quinolin-6-yl)-N,N-dimethylethane-1,2-diamine (IQDMA), an indoloquinoline derivative, synthesized in our laboratory, has been demonstrated to be an effective antitumor agent in human leukemia cells. In the present study, treatment with IQDMA inhibited phosphorylation of epidermal growth factor receptor (EGFR), Src, Bcr-Abl, and Janus-activated kinase (JAK2) in a time-dependent manner. IQDMA also degraded JAK2 protein. Moreover, signal transducer and activator of transcription 5 (STAT5) signaling were also blocked by IQDMA. However, IQDMA did not inhibit other oncogenic and tumor survival pathways such as those mediated by Akt and extracellular signal-regulated kinase 1/2. Furthermore, IQDMA upregulated the expression of p21 and p27 and downregulated the expression of cyclin D1, myeloid cell leukemia-1(Mcl-1), Bcl-X(L), and vascular endothelial growth factor (VEGF). Taken together, these results indicate that IQDMA causes significant induction of apoptosis in K562 cells via downregulation of EGFR, Src, Bcr-Abl, JAK2, and STAT5 signaling and modulation of p21, p27, cyclin D1, Mcl-1, Bcl-X(L), and VEGF proteins. Thus, IQDMA appears to be a potential therapeutic agent for treating leukemia K562 cells.
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Affiliation(s)
- Sheng-Huei Yang
- Faculty of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan, ROC
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