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Ansari AS, Kucharski C, Kc R, Nisakar D, Rahim R, Jiang X, Brandwein J, Uludağ H. Lipopolymer/siRNA complexes engineered for optimal molecular and functional response with chemotherapy in FLT3-mutated acute myeloid leukemia. Acta Biomater 2024:S1742-7061(24)00505-1. [PMID: 39236794 DOI: 10.1016/j.actbio.2024.08.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2024] [Revised: 08/27/2024] [Accepted: 08/29/2024] [Indexed: 09/07/2024]
Abstract
Approximately 25% of newly diagnosed AML patients display an internal tandem duplication (ITD) in the fms-like tyrosine kinase 3 (FLT3) gene. Although both multi-targeted and FLT3 specific tyrosine kinase inhibitors (TKIs) are being utilized for clinical therapy, drug resistance, short remission periods, and high relapse rates are challenges that still need to be tackled. RNA interference (RNAi), mediated by short interfering RNA (siRNA), presents a mechanistically distinct therapeutic platform with the potential of personalization due to its gene sequence-driven mechanism of action. This study explored the use of a non-viral approach for delivery of FLT3 siRNA (siFLT3) in FLT3-ITD positive AML cell lines and primary cells as well as the feasibility of combining this treatment with drugs currently used in the clinic. Treatment of AML cell lines with FLT3 siRNA nanocomplexes resulted in prominent reduction in cell proliferation rates and induction of apoptosis. Quantitative analysis of relative mRNA transcript levels revealed downregulation of the FLT3 gene, which was accompanied by a similar decline in FLT3 protein levels. Moreover, an impact on leukemic stem cells was observed in a small pool of primary AML samples through significantly reduced colony numbers. An absence of a molecular response post-treatment with lipopolymer/siFLT3 complexes in peripheral blood mononuclear cells, obtained from healthy individuals, denoted a passive selectivity of the complexes towards malignant cells. The effect of combining lipopolymer/siFLT3 complexes with daunorubucin and FLT3 targeting TKI gilteritinib led to a significant augmentation of anti-leukemic activity. These findings demonstrate the promising potential of RNAi implemented with lipopolymer complexes for AML molecular therapy. The study prospectively supports the addition of RNAi therapy to current treatment modalities available to target the heterogeneity prevalent in AML. STATEMENT OF SIGNIFICANCE: We show that a clinically validated target, the FLT3 gene, can be eradicated in leukemia cells using non-viral RNAi. We validated these lipopolymers as effective vehicles to deliver nucleic acids to leukemic cells. The potency of the lipopolymers was superior to that of the 'gold-standard' delivery agent, lipid nanoparticles (LNPs), which are not effective in leukemia cells at clinically relevant doses. Mechanistic studies were undertaken to probe structure-function relationships for effective biomaterial formulations. Cellular and molecular responses to siRNA treatment have been characterized in cell models, including leukemia patient-derived cells. The use of the siRNA therapy with clinically used chemotherapy was demonstrated.
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Affiliation(s)
- Aysha S Ansari
- Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Cezary Kucharski
- Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Remant Kc
- Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Daniel Nisakar
- Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Ramea Rahim
- Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Xiaoyan Jiang
- Terry Fox Laboratory, BC Cancer Research Institute and Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Joseph Brandwein
- Division of Hematology, Department of Medicine, Faculty of Medicine & Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Hasan Uludağ
- Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, Alberta, Canada; Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada.
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2
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Sharma P, Venkatachalam K, Binesh A. Decades Long Involvement of THP-1 Cells as a Model for Macrophage Research: A Comprehensive Review. Antiinflamm Antiallergy Agents Med Chem 2024; 23:85-104. [PMID: 38676532 DOI: 10.2174/0118715230294413240415054610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 03/22/2024] [Accepted: 03/26/2024] [Indexed: 04/29/2024]
Abstract
Over the years, researchers have endeavored to identify dependable and reproducible in vitro models for examining macrophage behavior under controlled conditions. The THP-1 cell line has become a significant and widely employed tool in macrophage research within these models. Originating from the peripheral blood of individuals with acute monocytic leukemia, this human monocytic cell line can undergo transformation into macrophage-like cells, closely mirroring primary human macrophages when exposed to stimulants. Macrophages play a vital role in the innate immune system, actively regulating inflammation, responding to infections, and maintaining tissue homeostasis. A comprehensive understanding of macrophage biology and function is crucial for gaining insights into immunological responses, tissue healing, and the pathogenesis of diseases such as viral infections, autoimmune disorders, and neoplastic conditions. This review aims to thoroughly evaluate and emphasize the extensive history of THP-1 cells as a model for macrophage research. Additionally, it will delve into the significance of THP-1 cells in advancing our comprehension of macrophage biology and their invaluable contributions to diverse scientific domains.
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Affiliation(s)
- Prakhar Sharma
- Institute of Fisheries Post Graduate Studies, Tamil Nadu Dr. J. Jayalalithaa Fisheries University (TNJFU), OMR Campus, Vaniyanchavadi, Chennai, 603103, Tamil Nadu, India
| | - Kaliyamurthi Venkatachalam
- Institute of Fisheries Post Graduate Studies, Tamil Nadu Dr. J. Jayalalithaa Fisheries University (TNJFU), OMR Campus, Vaniyanchavadi, Chennai, 603103, Tamil Nadu, India
| | - Ambika Binesh
- Institute of Fisheries Post Graduate Studies, Tamil Nadu Dr. J. Jayalalithaa Fisheries University (TNJFU), OMR Campus, Vaniyanchavadi, Chennai, 603103, Tamil Nadu, India
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3
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Senapati J, Kadia TM. Which FLT3 Inhibitor for Treatment of AML? Curr Treat Options Oncol 2022; 23:359-380. [PMID: 35258791 DOI: 10.1007/s11864-022-00952-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/20/2022] [Indexed: 12/17/2022]
Abstract
OPINION STATEMENT Treatment options in acute myeloid leukemia (AML) have improved significantly over the last decade with better understanding of disease biology and availability of a multitude of targeted therapies. The use of FLT3 inhibitors (FLT3i) in FLT3-mutated (FLT3mut) AML is one such development; however, the clinical decisions that govern their use and dictate the choice of the FLT3i are evolving. Midostaurin and gilteritinib are FDA-approved in specific situations; however, available data from clinical trials also shed light on the utility of sorafenib maintenance post-allogeneic stem cell transplantation (allo-SCT) and quizartinib as part of combination therapy in FLT3mut AML. The knowledge of the patient's concurrent myeloid mutations, type of FLT3 mutation, prior FLT3i use, and eligibility for allo-SCT helps to refine the choice of FLT3i. Data from ongoing studies will further precisely define their use and help in making more informed choices. Despite improvements in FLT3i therapy, the definitive aim is to enable the eligible patient with FLT3mut AML (esp. ITD) to proceed to allo-SCT with regimens containing FLT3i incorporated prior to SCT and as maintenance after SCT.
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Affiliation(s)
- Jayastu Senapati
- Department of Leukemia, MD Anderson Cancer Center, 1515 Holcombe Blvd. - Unit 428, Houston, 77030, USA
| | - Tapan Mahendra Kadia
- Department of Leukemia, MD Anderson Cancer Center, 1515 Holcombe Blvd. - Unit 428, Houston, 77030, USA.
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4
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Zhao JC, Agarwal S, Ahmad H, Amin K, Bewersdorf JP, Zeidan AM. A review of FLT3 inhibitors in acute myeloid leukemia. Blood Rev 2022; 52:100905. [PMID: 34774343 PMCID: PMC9846716 DOI: 10.1016/j.blre.2021.100905] [Citation(s) in RCA: 65] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 10/26/2021] [Accepted: 10/28/2021] [Indexed: 01/26/2023]
Abstract
FLT3 mutations are the most common genetic aberrations found in acute myeloid leukemia (AML) and associated with poor prognosis. Since the discovery of FLT3 mutations and their prognostic implications, multiple FLT3-targeted molecules have been evaluated. Midostaurin is approved in the U.S. and Europe for newly diagnosed FLT3 mutated AML in combination with standard induction and consolidation chemotherapy based on data from the RATIFY study. Gilteritinib is approved for relapsed or refractory FLT3 mutated AML as monotherapy based on the ADMIRAL study. Although significant progress has been made in the treatment of AML with FLT3-targeting, many challenges remain. Several drug resistance mechanisms have been identified, including clonal selection, stromal protection, FLT3-associated mutations, and off-target mutations. The benefit of FLT3 inhibitor maintenance therapy, either post-chemotherapy or post-transplant, remains controversial, although several studies are ongoing.
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Affiliation(s)
- Jennifer C Zhao
- Department of Pharmacy, Yale New Haven Hospital, New Haven, CT, USA
| | - Sonal Agarwal
- Department of Pharmacy, Yale New Haven Hospital, New Haven, CT, USA
| | - Hiba Ahmad
- Department of Pharmacy, Yale New Haven Hospital, New Haven, CT, USA
| | - Kejal Amin
- Department of Pharmacy, Yale New Haven Hospital, New Haven, CT, USA
| | - Jan Philipp Bewersdorf
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA; Leukemia Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Amer M Zeidan
- Department of Internal Medicine, Section of Hematology, Yale University School of Medicine, New Haven, CT, USA.
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5
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Long Y, Yu M, Ochnik AM, Karanjia JD, Basnet SK, Kebede AA, Kou L, Wang S. Discovery of novel 4-azaaryl-N-phenylpyrimidin-2-amine derivatives as potent and selective FLT3 inhibitors for acute myeloid leukaemia with FLT3 mutations. Eur J Med Chem 2021; 213:113215. [PMID: 33516985 DOI: 10.1016/j.ejmech.2021.113215] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 01/15/2021] [Accepted: 01/15/2021] [Indexed: 01/12/2023]
Abstract
Feline McDonough sarcoma (FMS)-like tyrosine kinase 3 (FLT3) is one of the most pursued targets in the treatment of acute myeloid leukaemia (AML) as its gene amplification and mutations, particularly internal tandem duplication (ITD), contribute to the pathogenesis of AML and the resistance to known FLT3 inhibitors. To conquer this challenge, there is a quest for structurally novel FLT3 inhibitors. Herein, we report the discovery of a new series of 4-azaaryl-N-phenylpyrimidin-2-amine derivatives as potent and selective FLT3 inhibitors. Compounds 12b and 12r were capable of suppressing a wide range of mutated FLT3 kinases including ITD and D835Y mutants; the latter isoform is closely associated with acquired drug resistance. In addition, both compounds displayed an anti-proliferative specificity for FLT3-ITD-harbouring cell lines (i.e., MV4-11 and MOLM-13 cells) over those with expression of the wild-type kinase or even without FLT3 expression. In mechanistic studies using MV4-11 cells, 12b was found to diminish the phosphorylation of key downstream effectors of FLT3 and induce apoptosis, supporting an FLT3-ITD-targeted mechanism of its anti-proliferative action.
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Affiliation(s)
- Yi Long
- Drug Discovery and Development, Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Mingfeng Yu
- Drug Discovery and Development, Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Aleksandra M Ochnik
- Drug Discovery and Development, Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Jasmine D Karanjia
- Drug Discovery and Development, Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Sunita Kc Basnet
- Drug Discovery and Development, Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Alemwork A Kebede
- Drug Discovery and Development, Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Lianmeng Kou
- Drug Discovery and Development, Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Shudong Wang
- Drug Discovery and Development, Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia.
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6
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Abbas HA, Alfayez M, Kadia T, Ravandi-Kashani F, Daver N. Midostaurin In Acute Myeloid Leukemia: An Evidence-Based Review And Patient Selection. Cancer Manag Res 2019; 11:8817-8828. [PMID: 31632141 PMCID: PMC6782026 DOI: 10.2147/cmar.s177894] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 09/12/2019] [Indexed: 01/08/2023] Open
Abstract
Fms-related-tyrosine kinase 3 (FLT3) mutations occur in approximately a third of acute myeloid leukemia (AML) patients and confer an adverse prognosis. Numerous studies have evaluated FLT3 targeting as single agent and in combination approaches in frontline and relapsed AML. At this time, midostaurin, a multikinase inhibitor, is the only FLT3-inhibitor that is US FDA approved to be used in combination with induction therapy in the frontline FLT3-mutated AML setting based on improved overall survival noted in the RATIFY Phase III trial. The utility of midostaurin in maintenance post stem cell transplantation has shown promising results and further studies are still ongoing. In this review, we discuss the studies that led to the inception of midostaurin as a targeted kinase inhibitor, its evaluation in AML, the early clinical trials and the large Phase III clinical trial that led to its eventual US FDA-approval in FLT3-mutated AML. Our review also discusses data on midostaurin adverse effects, mechanisms of resistance and limitations of its utility. We further discuss emerging second-generation FLT3 inhibitors, with a focus on quizartinib and gilteritinib and future directions to enhance FLT3-inhibitor efficacy and overcome mechanisms of resistance.
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Affiliation(s)
- Hussein A Abbas
- Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Mansour Alfayez
- Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Tapan Kadia
- Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Farhad Ravandi-Kashani
- Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Naval Daver
- Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
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7
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Ye C, Ho DJ, Neri M, Yang C, Kulkarni T, Randhawa R, Henault M, Mostacci N, Farmer P, Renner S, Ihry R, Mansur L, Keller CG, McAllister G, Hild M, Jenkins J, Kaykas A. DRUG-seq for miniaturized high-throughput transcriptome profiling in drug discovery. Nat Commun 2018; 9:4307. [PMID: 30333485 PMCID: PMC6192987 DOI: 10.1038/s41467-018-06500-x] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 08/31/2018] [Indexed: 12/21/2022] Open
Abstract
Here we report Digital RNA with pertUrbation of Genes (DRUG-seq), a high-throughput platform for drug discovery. Pharmaceutical discovery relies on high-throughput screening, yet current platforms have limited readouts. RNA-seq is a powerful tool to investigate drug effects using transcriptome changes as a proxy, yet standard library construction is costly. DRUG-seq captures transcriptional changes detected in standard RNA-seq at 1/100th the cost. In proof-of-concept experiments profiling 433 compounds across 8 doses, transcription profiles generated from DRUG-seq successfully grouped compounds into functional clusters by mechanism of actions (MoAs) based on their intended targets. Perturbation differences reflected in transcriptome changes were detected for compounds engaging the same target, demonstrating the value of using DRUG-seq for understanding on and off-target activities. We demonstrate DRUG-seq captures common mechanisms, as well as differences between compound treatment and CRISPR on the same target. DRUG-seq provides a powerful tool for comprehensive transcriptome readout in a high-throughput screening environment. RNA-seq is a powerful tool to investigate how drugs affect the transcriptome but library construction can be costly. Here the authors introduce DRUG-seq, an automated platform for high-throughput transcriptome profiling.
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Affiliation(s)
- Chaoyang Ye
- Neuroscience Research, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA.,Blueprint Medicines, 45 Sidney St, Cambridge, MA, 02139, USA
| | - Daniel J Ho
- Neuroscience Research, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Marilisa Neri
- Chemical Biology & Therapeutics Informatics, Novartis Institutes for Biomedical Research, Fabrikstrasse 22, 4056, Basel, Switzerland
| | - Chian Yang
- Chemical Biology & Therapeutics, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Tripti Kulkarni
- Scientific Computing, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Ranjit Randhawa
- Neuroscience Research, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Martin Henault
- Chemical Biology & Therapeutics, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Nadezda Mostacci
- Chemical Biology & Therapeutics Informatics, Novartis Institutes for Biomedical Research, Fabrikstrasse 22, 4056, Basel, Switzerland
| | - Pierre Farmer
- Chemical Biology & Therapeutics Informatics, Novartis Institutes for Biomedical Research, Fabrikstrasse 22, 4056, Basel, Switzerland
| | - Steffen Renner
- Chemical Biology & Therapeutics Informatics, Novartis Institutes for Biomedical Research, Fabrikstrasse 22, 4056, Basel, Switzerland
| | - Robert Ihry
- Neuroscience Research, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Leandra Mansur
- Analytical Sciences & Imaging, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Caroline Gubser Keller
- Chemical Biology & Therapeutics Informatics, Novartis Institutes for Biomedical Research, Fabrikstrasse 22, 4056, Basel, Switzerland
| | - Gregory McAllister
- Chemical Biology & Therapeutics Informatics, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Marc Hild
- Chemical Biology & Therapeutics, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Jeremy Jenkins
- Chemical Biology & Therapeutics Informatics, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA
| | - Ajamete Kaykas
- Neuroscience Research, Novartis Institutes for Biomedical Research, 250 Massachusetts, Cambridge, MA, 02139, USA.
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8
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Dual FLT3/TOPK inhibitor with activity against FLT3-ITD secondary mutations potently inhibits acute myeloid leukemia cell lines. Future Med Chem 2018; 10:823-835. [PMID: 29437468 PMCID: PMC6367750 DOI: 10.4155/fmc-2017-0298] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Aim: Approximately 30% of acute myeloid leukemia (AML) patients carry FLT3 tyrosine kinase domain (TKD) mutations or internal tandem duplication (FLT3-ITD). Currently there is a paucity of compounds that are active against drug-resistant FLT3-ITD, which contains secondary mutations in the TKD, mainly at residues D835/F691. Results: HSD1169, a novel compound, is active against FLT3-ITD (D835 or F691). HSD1169 is also active against T-LAK cell-originated protein kinase (TOPK), a collaborating kinase that is highly expressed in AML cell lines. HSD1169 was active against MV4–11 and Molm-14 (FLT3-ITD cell lines) but not NOMO-1 or HL60 (FLT3-WT cell lines). HSD1169 was also active against sorafenib-resistant Molm13-res cell line (containing FLT3-ITD/D835Y). Conclusion: HSD1169 or an analog could become a therapeutic agent for AML containing drug-resistant FLT3-ITD.
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9
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Zhang X, Li B, Yu J, Dahlström J, Tran AN, Björkholm M, Xu D. MYC-dependent downregulation of telomerase by FLT3 inhibitors is required for their therapeutic efficacy on acute myeloid leukemia. Ann Hematol 2017; 97:63-72. [PMID: 29080039 PMCID: PMC5748426 DOI: 10.1007/s00277-017-3158-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 10/10/2017] [Indexed: 11/24/2022]
Abstract
The somatic mutation of FLT3 occurs in 30% of acute myeloid leukemia (AML), with the majority of mutations exhibiting internal tandem duplication (ITD). On the other hand, the induction of telomerase reverse transcriptase (hTERT) and the activation of telomerase is a key step in AML development. Here, we sought to determine whether FLT3ITD regulates hTERT expression in AML cells and whether hTERT expression affects FLT3 inhibitors' therapeutic efficacy on AML. FLT3ITD-harboring AML cell lines and primary cells treated with the FLT3 inhibitor PKC412 displayed a rapid decline in the levels of hTERT mRNA and telomerase activity. Moreover, PKC412 inhibited hTERT gene transcription in a c-MYC-dependent manner. The ectopic expression of hTERT significantly attenuated the apoptotic effect of PKC412 on AML cells. Mechanistically, hTERT enhanced the activity of FLT3 downstream effectors or alternative RTK signaling, thereby enhancing AKT phosphorylation, in AML cells treated with PKC412. Collectively, PKC412 downregulates hTERT expression and telomerase activity in a MYC-dependent manner and this effect is required for its optimal anti-AML efficacy, while hTERT over-expression confers AML cells resistance to a targeted therapeutic agent PKC412. These findings suggest that the functional interplay between FLT3ITD and hTERT contributes to the AML pathogenesis and interferes with the efficacy of FLT3ITD-targeted therapy.
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Affiliation(s)
- Xiaolu Zhang
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Bingnan Li
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Jingya Yu
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Jenny Dahlström
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Anh Nhi Tran
- Department of Clinical Genetics, Karolinska University Hospital and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Magnus Björkholm
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Dawei Xu
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden.
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10
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Ao Z, Zhu R, Tan X, Liu L, Chen L, Liu S, Yao X. Activation of HIV-1 expression in latently infected CD4+ T cells by the small molecule PKC412. Virol J 2016; 13:177. [PMID: 27769267 PMCID: PMC5073835 DOI: 10.1186/s12985-016-0637-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 10/13/2016] [Indexed: 12/21/2022] Open
Abstract
Background HIV-1 latency is a major obstacle for HIV-1 eradication. Extensive efforts are being directed toward the reactivation of latent HIV reservoirs with the aim of eliminating latently infected cells via the host immune system and/or virus-mediated cell lysis. Results We screened over 1,500 small molecules and kinase inhibitors and found that a small molecule, PKC412 (midostaurin, a broad-spectrum kinase inhibitor), can stimulate viral transcription and expression from the HIV-1 latently infected ACH2 cell line and primary resting CD4+ T cells. PKC412 reactivated HIV-1 expression in ACH2 cells in a dose- and time-dependent manner. Our results also suggest that the nuclear factor κB (NF-κB) signaling could be one of cellular pathways activated during PKC412-mediated activation of latent HIV-1 expression. Additionally, combining PKC412 with the HDAC inhibitor vorinostat (VOR) had an additive effect on HIV-1 reactivation in both ACH2 cells and infected resting CD4+ T cells. Conclusions These studies provide evidence that PKC412 is a new compound with the potential for optimization as a latency-reactivator to eradicate HIV-1 infection.
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Affiliation(s)
- Zhujun Ao
- Department of Microbiology, School of Basic Medical Sciences, Central South University, Changsha, Hunan, 410078, People's Republic of China.,Laboratory of Molecular Human Retrovirology, Department of Medical Microbiology, Rady Faculty of Medicine, University of Manitoba, Winnipeg, MB, Canada
| | - Rong Zhu
- Laboratory of Molecular Human Retrovirology, Department of Medical Microbiology, Rady Faculty of Medicine, University of Manitoba, Winnipeg, MB, Canada
| | - Xiaoli Tan
- Department of Microbiology, School of Basic Medical Sciences, Central South University, Changsha, Hunan, 410078, People's Republic of China
| | - Lisa Liu
- Department of Microbiology, School of Basic Medical Sciences, Central South University, Changsha, Hunan, 410078, People's Republic of China
| | - Liyu Chen
- Department of Microbiology, School of Basic Medical Sciences, Central South University, Changsha, Hunan, 410078, People's Republic of China
| | - Shuiping Liu
- Department of Microbiology, School of Basic Medical Sciences, Central South University, Changsha, Hunan, 410078, People's Republic of China
| | - XiaoJian Yao
- Laboratory of Molecular Human Retrovirology, Department of Medical Microbiology, Rady Faculty of Medicine, University of Manitoba, Winnipeg, MB, Canada.
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11
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Narasimhan K, Lee YM, Lim TK, Port SA, Han JH, Chen CS, Lin Q. Genistein exerts anti-leukemic effects on genetically different acute myeloid leukemia cell lines by inhibiting protein synthesis and cell proliferation while inducing apoptosis - molecular insights from an iTRAQ™ quantitative proteomics study. Oncoscience 2015; 2:111-124. [PMID: 25859554 PMCID: PMC4381704 DOI: 10.18632/oncoscience.120] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 02/05/2015] [Indexed: 12/29/2022] Open
Abstract
Acute myeloid leukemia (AML) is a form of cancer that affects the hematopoietic precursor cells with lethal effects. We investigated the prospect of using genistein as an effective alternate therapy for AML. A two-cell line model, one possessing the FLT3 gene with the ITD mutation (MV4−11) and the other with the wildtype FLT3 gene (HL−60) has been employed. Our 8−plexed iTRAQ™−based quantitative proteomics analysis together with various functional studies demonstrated that genistein exerts anti-leukemic effects on both the AML cell lines. Genistein treatment on the AML cells showed that the drug arrested the mTOR pathway leading to down−regulation of protein synthesis. Additionally, genistein treatment is found to induce cell death via apoptosis. Contrasting regulatory effects of genistein on the cell cycle of the two cell lines were also identified, with the induction of G2/M phase arrest in HL-60 cells but not in MV4−11 cells. Hence, our study highlights the potent anti-leukemic effect of genistein on AML cells irrespective of their genetic status. This suggests the potential use of genistein as an effective general drug therapy for AML patients.
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Affiliation(s)
- Karthik Narasimhan
- Department of Biological Sciences, National University of Singapore, Singapore
| | - Yew Mun Lee
- Department of Biological Sciences, National University of Singapore, Singapore
| | - Teck Kwang Lim
- Department of Biological Sciences, National University of Singapore, Singapore
| | | | - Jin-Hua Han
- Department of Biological Sciences, National University of Singapore, Singapore
| | - Chien-Shing Chen
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Division of Hematology and Oncology, School of Medicine, Loma Linda University, Loma Linda, California, United States of America
| | - Qingsong Lin
- Department of Biological Sciences, National University of Singapore, Singapore
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12
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Lin WH, Yeh TK, Jiaang WT, Yen KJ, Chen CH, Huang CT, Yen SC, Hsieh SY, Chou LH, Chen CP, Chiu CH, Kao LC, Chao YS, Chen CT, Hsu JTA. Evaluation of the antitumor effects of BPR1J-340, a potent and selective FLT3 inhibitor, alone or in combination with an HDAC inhibitor, vorinostat, in AML cancer. PLoS One 2014; 9:e83160. [PMID: 24416160 PMCID: PMC3885398 DOI: 10.1371/journal.pone.0083160] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Accepted: 10/31/2013] [Indexed: 01/09/2023] Open
Abstract
Overexpression or/and activating mutation of FLT3 kinase play a major driving role in the pathogenesis of acute myeloid leukemia (AML). Hence, pharmacologic inhibitors of FLT3 are of therapeutic potential for AML treatment. In this study, BPR1J-340 was identified as a novel potent FLT3 inhibitor by biochemical kinase activity (IC50 approximately 25 nM) and cellular proliferation (GC50 approximately 5 nM) assays. BPR1J-340 inhibited the phosphorylation of FLT3 and STAT5 and triggered apoptosis in FLT3-ITD+ AML cells. The pharmacokinetic parameters of BPR1J-340 in rats were determined. BPR1J-340 also demonstrated pronounced tumor growth inhibition and regression in FLT3-ITD+ AML murine xenograft models. The combination treatment of the HDAC inhibitor vorinostat (SAHA) with BPR1J-340 synergistically induced apoptosis via Mcl-1 down-regulation in MOLM-13 AML cells, indicating that the combination of selective FLT3 kinase inhibitors and HDAC inhibitors could exhibit clinical benefit in AML therapy. Our results suggest that BPR1J-340 may be further developed in the preclinical and clinical studies as therapeutics in AML treatments.
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Affiliation(s)
- Wen-Hsing Lin
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Teng-Kuang Yeh
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Weir-Torn Jiaang
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Kuei-Jung Yen
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Chun-Hwa Chen
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Chin-Ting Huang
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Shih-Chieh Yen
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Shu-Yi Hsieh
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Ling-Hui Chou
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Ching-Ping Chen
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Chun-Hsien Chiu
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Li-Chun Kao
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Yu-Sheng Chao
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Chiung-Tong Chen
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
- * E-mail: (CTC); (JT-AH)
| | - John T.-A. Hsu
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
- * E-mail: (CTC); (JT-AH)
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13
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Eriksson A, Kalushkova A, Jarvius M, Hilhorst R, Rickardson L, Kultima HG, de Wijn R, Hovestad L, Fryknäs M, Öberg F, Larsson R, Parrow V, Höglund M. AKN-028 induces cell cycle arrest, downregulation of Myc associated genes and dose dependent reduction of tyrosine kinase activity in acute myeloid leukemia. Biochem Pharmacol 2013; 87:284-91. [PMID: 24200998 DOI: 10.1016/j.bcp.2013.10.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2013] [Revised: 10/16/2013] [Accepted: 10/17/2013] [Indexed: 01/10/2023]
Abstract
AKN-028 is a novel tyrosine kinase inhibitor with preclinical activity in acute myeloid leukemia (AML), presently undergoing investigation in a phase I/II study. It is a potent inhibitor of the FMS-like kinase 3 (FLT3) but shows in vitro activity in a wide range of AML samples. In the present study, we have characterized the effects of AKN-028 on AML cells in more detail. AKN-028 induced a dose-dependent G0/1 arrest in AML cell line MV4-11. Treatment with AKN-028 caused significantly altered gene expression in all AML cell types tested (430 downregulated, 280 upregulated transcripts). Subsequent gene set enrichment analysis revealed enrichment of genes associated with the proto-oncogene and cell cycle regulator c-Myc among the downregulated genes in both AKN-028 and midostaurin treated cells. Kinase activity profiling in AML cell lines and primary AML samples showed that tyrosine kinase activity, but not serine/threonine kinase activity, was inhibited by AKN-028 in a dose dependent manner in all samples tested, reaching approximately the same level of kinase activity. Cells sensitive to AKN-028 showed a higher overall tyrosine kinase activity than more resistant ones, whereas serine/threonine kinase activity was similar for all primary AML samples. In summary, AKN-028 induces cell cycle arrest in AML cells, downregulates Myc-associated genes and affect several signaling pathways. AML cells with high global tyrosine kinase activity seem to be more sensitive to the cytotoxic effect of AKN-028 in vitro.
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Affiliation(s)
- Anna Eriksson
- Department of Medical Sciences, Uppsala University, SE-751 85 Uppsala, Sweden.
| | - Antonia Kalushkova
- Department of Immunology, Genetics and Pathology, Uppsala University, SE-751 85 Uppsala, Sweden
| | - Malin Jarvius
- Department of Medical Sciences, Uppsala University, SE-751 85 Uppsala, Sweden
| | - Riet Hilhorst
- PamGene International B.V., 's-Hertogenbosch, The Netherlands
| | - Linda Rickardson
- Department of Medical Sciences, Uppsala University, SE-751 85 Uppsala, Sweden
| | | | - Rik de Wijn
- PamGene International B.V., 's-Hertogenbosch, The Netherlands
| | | | - Mårten Fryknäs
- Department of Medical Sciences, Uppsala University, SE-751 85 Uppsala, Sweden
| | - Fredrik Öberg
- Department of Immunology, Genetics and Pathology, Uppsala University, SE-751 85 Uppsala, Sweden
| | - Rolf Larsson
- Department of Medical Sciences, Uppsala University, SE-751 85 Uppsala, Sweden
| | | | - Martin Höglund
- Department of Medical Sciences, Uppsala University, SE-751 85 Uppsala, Sweden
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14
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Park JE, Yuen HF, Zhou JB, Al-Aidaroos AQO, Guo K, Valk PJ, Zhang SD, Chng WJ, Hong CW, Mills K, Zeng Q. Oncogenic roles of PRL-3 in FLT3-ITD induced acute myeloid leukaemia. EMBO Mol Med 2013; 5:1351-66. [PMID: 23929599 PMCID: PMC3799491 DOI: 10.1002/emmm.201202183] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 06/18/2013] [Accepted: 06/20/2013] [Indexed: 02/06/2023] Open
Abstract
FLT3-ITD mutations are prevalent mutations in acute myeloid leukaemia (AML). PRL-3, a metastasis-associated phosphatase, is a downstream target of FLT3-ITD. This study investigates the regulation and function of PRL-3 in leukaemia cell lines and AML patients associated with FLT3-ITD mutations. PRL-3 expression is upregulated by the FLT3-STAT5 signalling pathway in leukaemia cells, leading an activation of AP-1 transcription factors via ERK and JNK pathways. PRL-3-depleted AML cells showed a significant decrease in cell growth. Clinically, high PRL-3 mRNA expression was associated with FLT3-ITD mutations in four independent AML datasets with 1158 patients. Multivariable Cox-regression analysis on our Cohort 1 with 221 patients identified PRL-3 as a novel prognostic marker independent of other clinical parameters. Kaplan–Meier analysis showed high PRL-3 mRNA expression was significantly associated with poorer survival among 491 patients with normal karyotype. Targeting PRL-3 reversed the oncogenic effects in FLT3-ITD AML models in vitro and in vivo. Herein, we suggest that PRL-3 could serve as a prognostic marker to predict poorer survival and as a promising novel therapeutic target for AML patients.
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Affiliation(s)
- Jung Eun Park
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Research), Singapore
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15
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Radomska HS, Alberich-Jordà M, Will B, Gonzalez D, Delwel R, Tenen DG. Targeting CDK1 promotes FLT3-activated acute myeloid leukemia differentiation through C/EBPα. J Clin Invest 2012; 122:2955-66. [PMID: 22797303 DOI: 10.1172/jci43354] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Accepted: 06/07/2012] [Indexed: 11/17/2022] Open
Abstract
Mutations that activate the fms-like tyrosine kinase 3 (FLT3) receptor are among the most prevalent mutations in acute myeloid leukemias. The oncogenic role of FLT3 mutants has been attributed to the abnormal activation of several downstream signaling pathways, such as STAT3, STAT5, ERK1/2, and AKT. Here, we discovered that the cyclin-dependent kinase 1 (CDK1) pathway is also affected by internal tandem duplication mutations in FLT3. Moreover, we also identified C/EBPα, a granulopoiesis-promoting transcription factor, as a substrate for CDK1. We further demonstrated that CDK1 phosphorylates C/EBPα on serine 21, which inhibits its differentiation-inducing function. Importantly, we found that inhibition of CDK1 activity relieves the differentiation block in cell lines with mutated FLT3 as well as in primary patient-derived peripheral blood samples. Clinical trials with CDK1 inhibitors are currently under way for various malignancies. Our data strongly suggest that targeting the CDK1 pathway might be applied in the treatment of FLT3ITD mutant leukemias, especially those resistant to FLT3 inhibitor therapies.
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Affiliation(s)
- Hanna S Radomska
- Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA, USA
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16
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Lin WH, Jiaang WT, Chen CW, Yen KJ, Hsieh SY, Yen SC, Chen CP, Chang KY, Chang CY, Chang TY, Huang YL, Yeh TK, Chao YS, Chen CT, Hsu JTA. BPR1J-097, a novel FLT3 kinase inhibitor, exerts potent inhibitory activity against AML. Br J Cancer 2011; 106:475-81. [PMID: 22187040 PMCID: PMC3273346 DOI: 10.1038/bjc.2011.564] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Background: Activating mutations of Fms-like tyrosine kinase 3 (FLT3) constitute a major driver in the pathogenesis of acute myeloid leukaemia (AML). Hence, pharmacological inhibitors of FLT3 are of therapeutic interest for AML. Methods: The effects of inhibition of FLT3 activity by a novel potent FLT3 inhibitor, BPR1J-097, were investigated using in vitro and in vivo assays. Results: The 50% inhibitory concentration (IC50) of BPR1J-097 required to inhibit FLT3 kinase activity ranged from 1 to 10 nM, and the 50% growth inhibition concentrations (GC50s) were 21±7 and 46±14 nM for MOLM-13 and MV4-11 cells, respectively. BPR1J-097 inhibited FLT3/signal transducer and activator of transcription 5 phosphorylation and triggered apoptosis in FLT3-driven AML cells. BPR1J-097 also showed favourable pharmacokinetic property and pronounced dose-dependent tumour growth inhibition and regression in FLT3-driven AML murine xenograft models. Conclusion: These results indicate that BPR1J-097 is a novel small molecule FLT-3 inhibitor with promising in vivo anti-tumour activities and suggest that BPR1J-097 may be further developed in preclinical and clinical studies as therapeutics in AML treatments.
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Affiliation(s)
- W-H Lin
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, No. 35, Keyan Road, Zhunan, Miaoli County 350, Taiwan
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17
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Shih KC, Lin CY, Chi HC, Hwang CS, Chen TS, Tang CY, Hsiao NW. Design of novel FLT-3 inhibitors based on dual-layer 3D-QSAR model and fragment-based compounds in silico. J Chem Inf Model 2011; 52:146-55. [PMID: 22142286 DOI: 10.1021/ci200434f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
FMS-like tyrosine kinase 3 (FLT-3) is strongly correlated with acute myeloid leukemia, but no FLT-3-inhibitor cocomplex structure is available to assist the design of therapeutic inhibitors. Hence, we propose a dual-layer 3D-QSAR model for FLT-3 that integrates the pharmacophore, CoMFA, and CoMSIA. We then coupled the model with the fragment-based design strategy to identify novel FLT-3 inhibitors. In the first layer, the previously established model, Hypo02, was evaluated in terms of its correlation coefficient (r), RMS, cost difference, and configuration cost, with values of 0.930, 1.24, 106.45, and 16.44, respectively. Moreover, Fischer's cross-validation test of data generated by Hypo02 yielded a 98% confidence level, and the validation of the testing set yielded a best r value of 0.87. The features of Hypo02 were separated into two parts and then used to screen the MiniMaybridge fragment compound database. Nine novel FLT-3 inhibitors were generated in this layer. In the second layer, Hypo02 was subjected to an alignment rule to generate CoMFA- and CoMSIA-based models, for which the partial least-squares validation method was utilized. The values of q(2), r(2), and predictive r(2) were 0.58, 0.98, and 0.76, respectively, derived from the CoMFA model with steric and electrostatic fields. The CoMSIA model with five different fields yielded values of 0.54, 0.97, and 0.76 for q(2), r(2), and predictive r(2), respectively. The CoMFA and CoMSIA models were used to constrain 3D structures of the nine novel FLT-3 inhibitors. This dual-layer 3D-QSAR model constitutes a valuable tool to easily and quickly screen and optimize novel potential FLT-3 inhibitors for the treatment of acute myeloid leukemia.
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Affiliation(s)
- Kuei-Chung Shih
- Department of Computer Science, National Tsing Hua University, Hsinchu 30013, Taiwan
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18
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Reikvam H, Hatfield KJ, Ersvaer E, Hovland R, Skavland J, Gjertsen BT, Petersen K, Bruserud O. Expression profile of heat shock proteins in acute myeloid leukaemia patients reveals a distinct signature strongly associated with FLT3 mutation status--consequences and potentials for pharmacological intervention. Br J Haematol 2011; 156:468-80. [PMID: 22150087 DOI: 10.1111/j.1365-2141.2011.08960.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Heat shock proteins (HSPs) are molecular chaperones that assist proteins in their folding to native structures. HSPs are regarded as possible therapeutic targets in acute myeloid leukaemia (AML). We used bioinformatical approaches to characterize the HSP profile in AML cells from 75 consecutive patients, in addition to the effect of the HSP90 inhibitor 17-DMAG. Patients harbouring a FLT3-internal tandem duplication (FLT3-ITD) were extensively overrepresented in the cluster with high HSP levels, indicating a strong dependence of HSPs in stabilizing FLT3-ITD encoded oncoproteins. FLT3 ligation further increased the levels of HSP90 and its co-chaperone HSP70. HSP90 inhibition had a stronger pro-apoptotic effect for AML cells with FLT3-ITD than for cells with wild-type FLT3, whereas the anti-proliferative effect of HSP90 inhibition was similar for the two patient subsets. HSP90 inhibition altered the constitutive cytokine release profile in an anti-angiogenic direction independent of FLT3 mutational status: (i) pro-angiogenic CXCL8, MMP-2 and MMP-9 showed a stronger decrease than anti-angiogenic CXCL9-11, (ii) the Tie-2 agonist Ang-1 showed a stronger decrease than the potentially antagonistic Ang-2, and (iii) VEGF and HGF levels were decreased. Finally, HSP90 inhibition counteracted the leukaemia-stimulating effect of endothelial cells. Our studies demonstrate that HSP90 inhibition mediates anti-leukaemic effects through both direct and indirect activity.
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Affiliation(s)
- Håkon Reikvam
- Division for Haematology, Institute of Medicine, University of Bergen, Norway
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19
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Huang YC, Chao DK, Clifford Chao K, Chen YJ. Oral small-molecule tyrosine kinase inhibitor midostaurin (PKC412) inhibits growth and induces megakaryocytic differentiation in human leukemia cells. Toxicol In Vitro 2009; 23:979-85. [DOI: 10.1016/j.tiv.2009.06.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 05/17/2009] [Accepted: 06/25/2009] [Indexed: 11/26/2022]
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20
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Weisberg E, Barrett R, Liu Q, Stone R, Gray N, Griffin JD. FLT3 inhibition and mechanisms of drug resistance in mutant FLT3-positive AML. Drug Resist Updat 2009; 12:81-9. [PMID: 19467916 DOI: 10.1016/j.drup.2009.04.001] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2009] [Revised: 04/16/2009] [Accepted: 04/16/2009] [Indexed: 10/20/2022]
Abstract
An appealing therapeutic target in AML is constitutively activated, mutant FLT3, which is expressed in a subpopulation of AML patients and is generally a poor prognostic indicator in patients under the age of 65. There are currently several FLT3 inhibitors that are undergoing clinical investigation. However, the discovery of drug-resistant leukemic blast cells in FLT3 inhibitor-treated AML patients has prompted the search for novel, structurally diverse FLT3 inhibitors that could be alternatively used to circumvent drug resistance. Here, we provide an overview of FLT3 inhibitors under preclinical and clinical investigation, and we discuss mechanisms whereby AML cells develop resistance to FLT3 inhibitors, and the ways in which combination therapy could potentially be utilized to override drug resistance. We discuss how the cross-talk between major downstream signaling pathways, such as PI3K/PTEN/Akt/mTOR, RAS/Raf/MEK/ERK, and Jak/STAT, can be exploited for therapeutic purposes by targeting key signaling molecules with selective inhibitors, such as mTOR inhibitors, HSP90 inhibitors, or farnesyltransferase inhibitors, and identifying those agents with the ability to positively combine with inhibitors of FLT3, such as PKC412 and sunitinib. With the widespread onset of drug resistance associated with tyrosine kinase inhibitors, due to mechanisms involving development of point mutations or gene amplification of target proteins, the use of a multi-targeted therapeutic approach is of potential clinical benefit.
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Affiliation(s)
- Ellen Weisberg
- Department of Medical Oncology/Hematologic Neoplasia, Dana Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA.
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21
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A novel missense mutation of ABCA1 in transmembrane alpha-helix in a Japanese patient with Tangier disease. Atherosclerosis 2009; 206:216-22. [PMID: 19344898 DOI: 10.1016/j.atherosclerosis.2009.02.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2008] [Revised: 01/15/2009] [Accepted: 02/12/2009] [Indexed: 11/24/2022]
Abstract
Tangier disease (TD) is a hereditary disorder characterized by the severe deficiency or absence of high-density lipoprotein cholesterol (HDL-C). TD is caused by mutations in the ATP-binding cassette transporter A1 (ABCA1) gene, most of which are located in the extracellular loops and nucleotide-binding domains. Here we describe the first case of TD carrying a missense mutation in a transmembrane alpha-helix of ABCA1. A 31-year-old Japanese woman had an extremely low level of HDL-C (1mg/dl) and yellowish tonsillar swelling, leading to the diagnosis of TD. The proband was homozygous for a point mutation of T4978C in exon 37, which results in the substitution of cysteine-1660 to arginine (C1660R) in the 8th transmembrane segment of ABCA1. Her parents, grandmother, and brother were found to be heterozygous for the same mutation. Both peripheral blood leukocytes from the patient and HEK293 cells transfected with T4978C-mutated ABCA1 normally expressed ABCA1 on the plasma membrane and had normal apolipoprotein A-I-binding ability. However, apolipoprotein A-I-mediated efflux of cholesterol and phospholipids was markedly diminished in HEK293 cells transfected with T4978C-mutated ABCA1. These results suggest that this mutant is normally translated and exists as a stable product with normal localization, yet is functionally defective. Cysteine-1660 appears to be a critical residue for cholesterol transport of ABCA1.
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22
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Molecular targeting of MLL-rearranged leukemia cell lines with the synthetic peptide PFWT synergistically enhances the cytotoxic effect of established chemotherapeutic agents. Leuk Res 2009; 33:937-47. [PMID: 19232721 DOI: 10.1016/j.leukres.2009.01.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2008] [Revised: 01/12/2009] [Accepted: 01/15/2009] [Indexed: 11/21/2022]
Abstract
MLL leukemias are characterized cytogenetically by reciprocal translocations of the MLL gene at 11q23 and clinically by unfavorable outcomes. Evidence indicating that MLL leukemias are resistant to apoptosis encourages the identification of agents that induce cell death by other mechanisms. The AF4-mimetic peptide PFWT induces necrosis in the t(4;11) leukemia cell line, MV4-11. Treatment of MV4-11 cells with PFWT in combination with four chemotherapeutic compounds results in sequence-dependent synergy, induction of both apoptotic and necrotic cell death, and inhibition of MV4-11 clonogenicity. Therefore, PFWT holds promise as a therapy for MLL leukemias that augments the effects of several clinically available chemotherapeutic agents.
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23
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Chu SH, Small D. Mechanisms of resistance to FLT3 inhibitors. Drug Resist Updat 2009; 12:8-16. [PMID: 19162530 PMCID: PMC4891941 DOI: 10.1016/j.drup.2008.12.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2008] [Accepted: 12/02/2008] [Indexed: 11/21/2022]
Abstract
The success of the small molecule tyrosine kinase receptor inhibitor (TKI) imatinib mesylate (Gleevec) in the treatment of chronic myeloid leukemia (CML) constitutes an eminent paradigm shift advocating the rational design of cancer therapeutics specifically targeting the transformation events that drive tumorigenicity. In acute myeloid leukemias (AMLs), the most frequent identified transforming events are activating mutations in the FLT3 receptor tyrosine kinase that constitutively activate survival and proliferation pathways. FLT3 TKIs that are in various phases of clinical trials are showing some initial promise. However, primary and secondary acquired resistance stands to severely compromise long-term and durable efficacy of these inhibitors as a therapeutic strategy. Here, we discuss the mechanisms of resistance to FLT3 inhibitors and possible strategies to overcome resistance through closer examination of the events of leukemogenesis and design of combination therapy.
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MESH Headings
- Animals
- Antineoplastic Agents/pharmacokinetics
- Antineoplastic Agents/therapeutic use
- Antineoplastic Combined Chemotherapy Protocols
- Cell Proliferation/drug effects
- Cell Survival/drug effects
- Drug Resistance, Neoplasm/genetics
- Gene Expression Regulation, Leukemic
- Humans
- Leukemia, Myeloid, Acute/drug therapy
- Leukemia, Myeloid, Acute/enzymology
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/pathology
- Neoplastic Stem Cells/drug effects
- Neoplastic Stem Cells/enzymology
- Protein Kinase Inhibitors/pharmacokinetics
- Protein Kinase Inhibitors/therapeutic use
- fms-Like Tyrosine Kinase 3/antagonists & inhibitors
- fms-Like Tyrosine Kinase 3/genetics
- fms-Like Tyrosine Kinase 3/metabolism
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Affiliation(s)
- S. Haihua Chu
- Department of Oncology, Johns Hopkins University School of Medicine, CRB1-251, 1650 Orleans St., Baltimore, MD 21231-1000, United States
- Cellular and Molecular Medicine Program, Johns Hopkins University School of Medicine, CRB1-251, 1650 Orleans St., Baltimore, MD 21231-1000, United States
| | - Donald Small
- Department of Oncology, Johns Hopkins University School of Medicine, CRB1-251, 1650 Orleans St., Baltimore, MD 21231-1000, United States
- Department of Pediatrics, Johns Hopkins University School of Medicine, CRB1-251, 1650 Orleans St., Baltimore, MD 21231-1000, United States
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24
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Hatano K, Kikuchi J, Takatoku M, Shimizu R, Wada T, Ueda M, Nobuyoshi M, Oh I, Sato K, Suzuki T, Ozaki K, Mori M, Nagai T, Muroi K, Kano Y, Furukawa Y, Ozawa K. Bortezomib overcomes cell adhesion-mediated drug resistance through downregulation of VLA-4 expression in multiple myeloma. Oncogene 2008; 28:231-42. [DOI: 10.1038/onc.2008.385] [Citation(s) in RCA: 142] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Haferlach T. Molecular genetic pathways as therapeutic targets in acute myeloid leukemia. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2008; 2008:400-411. [PMID: 19074117 DOI: 10.1182/asheducation-2008.1.400] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The heterogeneity of acute myeloid leukemia (AML) results from a complex network of cytogenetic aberrations and molecular mutations. These genetic markers are the basis for the categorization of cases within distinct subgroups and are highly relevant for the prediction of prognosis and for therapeutic decisions in AML. Clinical variances within distinct genetically defined subgroups could in part be linked to the interaction of diverse mutation classes, and the subdivision of normal karyotype AML on the basis of recurrent molecular mutations gains increasing relevance for therapeutic decisions. In parallel to these important insights in the complexity of the genetic networks in AML, a variety of diverse new compounds is being investigated in preclinical and clinical studies. These approaches aim to develop targeted treatment concepts that are based on interference with molecular genetic or epigenetic mechanisms. This review provides an overview on the most relevant genetic markers, which serve as basis for targeted therapy approaches now or might represent options for such approaches in the future, and summarizes recent results of targeted therapy studies.
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