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Recent Advances in the Development of Anti-FLT3 CAR T-Cell Therapies for Treatment of AML. Biomedicines 2022; 10:biomedicines10102441. [PMID: 36289703 PMCID: PMC9598885 DOI: 10.3390/biomedicines10102441] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/20/2022] [Accepted: 09/23/2022] [Indexed: 11/17/2022] Open
Abstract
Following the success of the anti-CD19 chimeric antigen receptor (CAR) T-cell therapies against B-cell malignancies, the CAR T-cell approach is being developed towards other malignancies like acute myeloid leukemia (AML). Treatment options for relapsed AML patients are limited, and the upregulation of the FMS-like tyrosine kinase 3 (FLT3) in malignant T-cells is currently not only being investigated as a prognostic factor, but also as a target for new treatment options. In this review, we provide an overview and discuss different approaches of current anti-FLT3 CAR T-cells under development. In general, these therapies are effective both in vitro and in vivo, however the safety profile still needs to be further investigated. The first clinical trials have been initiated, and the community now awaits clinical evaluation of the approach of targeting FLT3 with CAR T-cells.
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2
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Li KX, Wu HY, Pan WY, Guo MQ, Qiu DZ, He YJ, Li YH, Yang DH, Huang YX. A novel approach for relapsed/refractory FLT3 mut+ acute myeloid leukaemia: synergistic effect of the combination of bispecific FLT3scFv/NKG2D-CAR T cells and gilteritinib. Mol Cancer 2022; 21:66. [PMID: 35246156 PMCID: PMC8896098 DOI: 10.1186/s12943-022-01541-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 02/12/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Patients with relapsed/refractory acute myeloid leukaemia (AML) with FMS-like tyrosine kinase 3-internal tandem duplication (FLT3-ITD) have limited treatment options and poor prognosis. Therefore, novel treatment modalities are needed. Since high expression of natural killer group 2 member D ligands (NKG2DLs) can be induced by FLT3 inhibitors, we constructed dual-target FLT3 single-chain fragment variable (scFv)/NKG2D-chimeric antigen receptor (CAR) T cells, and explored whether FLT3 inhibitors combined with FLT3scFv/NKG2D-CAR T cells could have synergistic anti-leukaemia effects. METHODS FLT3scFv and NKG2D expression in CAR T cells, FLT3 and NKG2DL expression in AML cells, and the in vitro cytotoxicity of combining CAR T cells with gilteritinib were assessed by flow cytometry. The therapeutic effect was evaluated in a xenograft mouse model established by injection of MOLM-13 cells. Mechanisms underlying the gilteritinib-induced NKG2DL upregulation were investigated using siRNA, ChIP-QPCR and luciferase assays. RESULTS The FLT3scFv/NKG2D-CAR T cells specifically lysed AML cells both in vitro and in the xenograft mouse model. The efficacy of FLT3scFv/NKG2D-CAR T cells was improved by gilteritinib-pretreatment. The noncanonical NF-κB2/Rel B signalling pathway was found to mediate gilteritinib-induced NKG2DL upregulation in AML cells. CONCLUSIONS Bispecific FLT3scFv/NKG2D-CAR T cells can effectively eradicate AML cells. The FLT3 inhibitor gilteritinib can synergistically improve this effect by upregulating NF-κB2-dependent NKG2DL expression in AML cells.
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Affiliation(s)
- Ke-Xin Li
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Hui-Yang Wu
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Wan-Ying Pan
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Meng-Qi Guo
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - De-Zhi Qiu
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Yan-Jie He
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Yu-Hua Li
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Dong-Hua Yang
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY, 11439, USA.
| | - Yu-Xian Huang
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China.
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Wang Z, Cai J, Cheng J, Yang W, Zhu Y, Li H, Lu T, Chen Y, Lu S. FLT3 Inhibitors in Acute Myeloid Leukemia: Challenges and Recent Developments in Overcoming Resistance. J Med Chem 2021; 64:2878-2900. [PMID: 33719439 DOI: 10.1021/acs.jmedchem.0c01851] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Mutations in the FMS-like tyrosine kinase 3 (FLT3) gene are often present in newly diagnosed acute myeloid leukemia (AML) patients with an incidence rate of approximately 30%. Recently, many FLT3 inhibitors have been developed and exhibit positive preclinical and clinical effects against AML. However, patients develop resistance soon after undergoing FLT3 inhibitor treatment, resulting in short durable responses and poor clinical effects. This review will discuss the main mechanisms of resistance to clinical FLT3 inhibitors and summarize the emerging strategies that are utilized to overcome drug resistance. Basically, medicinal chemistry efforts to develop new small-molecule FLT3 inhibitors offer a direct solution to this problem. Other potential strategies include the combination of FLT3 inhibitors with other therapies and the development of multitarget inhibitors. It is hoped that this review will provide inspiring insights into the discovery of new AML therapies that can eventually overcome the resistance to current FLT3 inhibitors.
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Affiliation(s)
- Zhijie Wang
- School of Science, China Pharmaceutical University, Nanjing 211198, P.R. China
| | - Jiongheng Cai
- School of Science, China Pharmaceutical University, Nanjing 211198, P.R. China
| | - Jie Cheng
- School of Science, China Pharmaceutical University, Nanjing 211198, P.R. China
| | - Wenqianzi Yang
- School of Science, China Pharmaceutical University, Nanjing 211198, P.R. China
| | - Yifan Zhu
- School of Pharmacy, China Pharmaceutical University, Nanjing 210009, P.R. China
| | - Hongmei Li
- School of Science, China Pharmaceutical University, Nanjing 211198, P.R. China
| | - Tao Lu
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, P.R. China
| | - Yadong Chen
- Laboratory of Molecular Design and Drug Discovery, China Pharmaceutical University, Nanjing, 211198, P.R. China
| | - Shuai Lu
- School of Science, China Pharmaceutical University, Nanjing 211198, P.R. China
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4
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Hasegawa H, Taniguchi H, Nakamura Y, Kato T, Fujii S, Ebi H, Shiozawa M, Yuki S, Masuishi T, Kato K, Izawa N, Moriwaki T, Oki E, Kagawa Y, Denda T, Nishina T, Tsuji A, Hara H, Esaki T, Nishida T, Kawakami H, Sakamoto Y, Miki I, Okamoto W, Yamazaki K, Yoshino T. FMS-like tyrosine kinase 3 (FLT3) amplification in patients with metastatic colorectal cancer. Cancer Sci 2021; 112:314-322. [PMID: 33075166 PMCID: PMC7780005 DOI: 10.1111/cas.14693] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/10/2020] [Accepted: 10/12/2020] [Indexed: 01/11/2023] Open
Abstract
FMS-like tyrosine kinase 3 (FLT3) plays a key role in hematopoiesis. However, the oncogenic role of FLT3 amplification in patients with metastatic colorectal cancer (mCRC) remains unclear. Here, we aimed to evaluate the characteristics, prognosis, and treatment efficacy of an FLT3 inhibitor (regorafenib) in patients with mCRC with FLT3 amplifications. Tumor tissue samples from 2329 patients were sequenced using NGS in the Nationwide Cancer Genome Screening Project in Japan. The effects of clinicopathological features, co-altered genes, prognosis, and efficacy of regorafenib were investigated. Between April 2015 and June 2018, 85 patients with mCRC with FLT3 amplification were observed. There were no differences in baseline characteristics between patients with or without FLT3 amplification. The frequency of RAS or other gene co-alterations was inversely correlated with the copy number status. Median survival time in patients with FLT3 amplification was significantly shorter compared with those with non-FLT3 amplification. Further investigations of FLT3 amplification as a potential treatment target in mCRC are warranted.
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Affiliation(s)
- Hiroko Hasegawa
- Department of Gastroenterology and HepatologyNational Hospital OrganizationOsaka National HospitalOsakaJapan
| | - Hiroya Taniguchi
- Department of Gastroenterology and Gastrointestinal OncologyNational Cancer Center Hospital EastKashiwaJapan
- Translational Research Support SectionClinical Research Support DepartmentNational Cancer Center Hospital EastKashiwaJapan
| | - Yoshiaki Nakamura
- Department of Gastroenterology and Gastrointestinal OncologyNational Cancer Center Hospital EastKashiwaJapan
- Translational Research Support SectionClinical Research Support DepartmentNational Cancer Center Hospital EastKashiwaJapan
| | - Takeshi Kato
- Department of SurgeryNational Hospital OrganizationOsaka National HospitalOsakaJapan
| | - Satoshi Fujii
- Division of PathologyExploratory Oncology Research & Clinical Trial CenterNational Cancer Center EastKashiwaJapan
- Department of Molecular PathologyYokohama City University Graduate School of MedicineYokohamaJapan
| | - Hiromichi Ebi
- Division of Molecular TherapeuticsAichi Cancer Center Research InstituteNagoyaJapan
| | - Manabu Shiozawa
- Department of Gastrointestinal SurgeryKanagawa Cancer CenterKanagawaJapan
| | - Satoshi Yuki
- Department of Gastroenterology and HepatologyHokkaido University HospitalSapporoJapan
| | - Toshiki Masuishi
- Department of Clinical OncologyAichi Cancer Center HospitalNagoyaJapan
| | - Ken Kato
- Gastrointestinal Medical Oncology DivisionNational Cancer Center HospitalTokyoJapan
| | - Naoki Izawa
- Division of Clinical OncologySt. Marianna University School of MedicineKawasakiJapan
| | - Toshikazu Moriwaki
- Division of GastroenterologyFaculty of MedicineUniversity of TsukubaTsukubaJapan
| | - Eiji Oki
- Department of Surgery and ScienceGraduate School of Medical SciencesKyushu UniversityFukuokaJapan
| | - Yoshinori Kagawa
- Department of SurgeryOsaka Prefectural General Medical CenterOsakaJapan
| | | | - Tomohiro Nishina
- Division of GastroenterologyNational Hospital OrganizationShikoku Cancer CenterMatsuyamaJapan
| | - Akihito Tsuji
- Department of Medical OncologyKagawa University HospitalKagawaJapan
| | - Hiroki Hara
- Department of GastroenterologySaitama Cancer CenterSaitamaJapan
| | - Taito Esaki
- Department of Gastrointestinal and Medical OncologyNational Hospital Organization Kyushu Cancer CenterFukuokaJapan
| | - Tomohiro Nishida
- Frontier Science for Cancer and ChemotherapyOsaka UniversityOsakaJapan
| | | | - Yasutoshi Sakamoto
- Translational Research Support SectionClinical Research Support DepartmentNational Cancer Center Hospital EastKashiwaJapan
| | - Izumi Miki
- Translational Research Support SectionClinical Research Support DepartmentNational Cancer Center Hospital EastKashiwaJapan
| | - Wataru Okamoto
- Translational Research Support SectionClinical Research Support DepartmentNational Cancer Center Hospital EastKashiwaJapan
- Cancer Treatment CenterHiroshima University HospitalHiroshimaJapan
| | - Kentaro Yamazaki
- Division of Gastrointestinal OncologyShizuoka Cancer CenterShizuokaJapan
| | - Takayuki Yoshino
- Department of Gastroenterology and Gastrointestinal OncologyNational Cancer Center Hospital EastKashiwaJapan
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5
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Marensi V, Keeshan KR, MacEwan DJ. Pharmacological impact of FLT3 mutations on receptor activity and responsiveness to tyrosine kinase inhibitors. Biochem Pharmacol 2020; 183:114348. [PMID: 33242449 DOI: 10.1016/j.bcp.2020.114348] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 11/19/2020] [Accepted: 11/19/2020] [Indexed: 01/09/2023]
Abstract
Acute myelogenous leukaemia (AML) is an aggressive blood cancer characterized by the rapid proliferation of immature myeloid blast cells, resulting in a high mortality rate. The 5-year overall survival rate for AML patients is approximately 25%. Circa 35% of all patients carry a mutation in the FLT3 gene which have a poor prognosis. Targeting FLT3 receptor tyrosine kinase has become a treatment strategy in AML patients possessing FLT3 mutations. The most common mutations are internal tandem duplications (ITD) within exon 14 and a single nucleotide polymorphism (SNP) that leads to a point mutation in the D835 of the tyrosine kinase domain (TKD). Variations in the ITD sequence and the occurrence of other point mutations that lead to ligand-independent FLT3 receptor activation create difficulties in developing personalized therapeutic strategies to overcome observed mutation-driven drug resistance. Midostaurin and quizartinib are tyrosine kinase inhibitors (TKIs) with inhibitory efficacy against FLT3-ITD, but exhibit limited clinical impact. In this review, we focus on the structural aspects of the FLT3 receptor and correlate those mutations with receptor activation and the consequences for molecular and clinical responsiveness towards therapies targeting FLT3-ITD positive AML.
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Affiliation(s)
- Vanessa Marensi
- Department of Pharmacology and Therapeutics, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, United Kingdom
| | - Karen R Keeshan
- Paul O'Gorman Leukaemia Research Centre, Institute of Cancer Sciences, University of Glasgow, Glasgow, United Kingdom
| | - David J MacEwan
- Department of Pharmacology and Therapeutics, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, United Kingdom.
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6
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Larrosa-Garcia M, Baer MR. FLT3 Inhibitors in Acute Myeloid Leukemia: Current Status and Future Directions. Mol Cancer Ther 2018; 16:991-1001. [PMID: 28576946 DOI: 10.1158/1535-7163.mct-16-0876] [Citation(s) in RCA: 205] [Impact Index Per Article: 34.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Revised: 01/13/2017] [Accepted: 04/05/2017] [Indexed: 12/11/2022]
Abstract
The receptor tyrosine kinase fms-like tyrosine kinase 3 (FLT3), involved in regulating survival, proliferation, and differentiation of hematopoietic stem/progenitor cells, is expressed on acute myeloid leukemia (AML) cells in most patients. Mutations of FLT3 resulting in constitutive signaling are common in AML, including internal tandem duplication (ITD) in the juxtamembrane domain in 25% of patients and point mutations in the tyrosine kinase domain in 5%. Patients with AML with FLT3-ITD have a high relapse rate and short relapse-free and overall survival after chemotherapy and after transplant. A number of inhibitors of FLT3 signaling have been identified and are in clinical trials, both alone and with chemotherapy, with the goal of improving clinical outcomes in patients with AML with FLT3 mutations. While inhibitor monotherapy produces clinical responses, they are usually incomplete and transient, and resistance develops rapidly. Diverse combination therapies have been suggested to potentiate the efficacy of FLT3 inhibitors and to prevent development of resistance or overcome resistance. Combinations with epigenetic therapies, proteasome inhibitors, downstream kinase inhibitors, phosphatase activators, and other drugs that alter signaling are being explored. This review summarizes the current status of translational and clinical research on FLT3 inhibitors in AML, and discusses novel combination approaches. Mol Cancer Ther; 16(6); 991-1001. ©2017 AACR.
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MESH Headings
- Animals
- Antineoplastic Combined Chemotherapy Protocols/adverse effects
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Clinical Trials as Topic
- Drug Evaluation, Preclinical
- Drug Resistance, Neoplasm/genetics
- Humans
- Leukemia, Myeloid, Acute/drug therapy
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/mortality
- Leukemia, Myeloid, Acute/pathology
- Mutation
- Protein Binding
- Protein Interaction Domains and Motifs
- Protein Kinase Inhibitors/pharmacology
- Protein Kinase Inhibitors/therapeutic use
- Protein Multimerization
- Tandem Repeat Sequences
- Treatment Outcome
- fms-Like Tyrosine Kinase 3/antagonists & inhibitors
- fms-Like Tyrosine Kinase 3/chemistry
- fms-Like Tyrosine Kinase 3/genetics
- fms-Like Tyrosine Kinase 3/metabolism
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Affiliation(s)
- Maria Larrosa-Garcia
- University of Maryland Greenebaum Comprehensive Cancer Center, Baltimore, Maryland
| | - Maria R Baer
- University of Maryland Greenebaum Comprehensive Cancer Center, Baltimore, Maryland.
- Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland
- Veterans Affairs Medical Center, Baltimore, Maryland
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7
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Verstraete K, Savvides SN. Extracellular assembly and activation principles of oncogenic class III receptor tyrosine kinases. Nat Rev Cancer 2012; 12:753-66. [PMID: 23076159 DOI: 10.1038/nrc3371] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Intracellular signalling cascades initiated by class III receptor tyrosine kinases (RTK-IIIs) and their cytokine ligands contribute to haematopoiesis and mesenchymal tissue development. They are also implicated in a wide range of inflammatory disorders and cancers. Recent snapshots of RTK-III ectodomains in complex with cognate cytokines have revealed timely insights into the structural determinants of RTK-III activation, evolution and pathology. Importantly, candidate 'driver' and 'passenger' mutations that have been identified in RTK-IIIs can now be collectively mapped for the first time to structural scaffolds of the corresponding RTK-III ectodomains. Such insights will generate a renewed interest in dissecting the mechanistic effects of such mutations and their therapeutic relevance.
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Affiliation(s)
- Kenneth Verstraete
- Unit for Structural Biology, Laboratory for Protein Biochemistry and Biomolecular Engineering, Ghent University, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium.
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8
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Zhou Y, Zhao L, Marks JD. Selection and characterization of cell binding and internalizing phage antibodies. Arch Biochem Biophys 2012; 526:107-13. [PMID: 22627065 DOI: 10.1016/j.abb.2012.05.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 05/09/2012] [Accepted: 05/13/2012] [Indexed: 12/25/2022]
Abstract
Many therapeutic targets are cell surface receptors, which can be challenging antigens for antibody generation. For many therapeutic applications, one needs antibodies that not only bind the cell surface receptor but also are internalized into the cell. This allows use of the antibody to deliver various payloads into the cell to achieve a therapeutic effect. Phage antibody technology has proven a powerful tool for the generation and optimization of human antibodies to any antigen. While applied to the generation of antibodies to purified proteins, it is possible to directly select cell binding and internalizing antibodies on cells. Potential advantages of this approach include: cell surface receptors are in native conformation on intact cells while this might not be so for recombinant proteins; antibodies can be selected for both cell binding and internalization properties; the antibodies can be used to identify their tumor associated antigens; and such antibodies can be used for human treatment directly since they are human in sequence. This review will discuss the factors that impact the successful selection of cell binding and internalizing antibodies. These factors include the cell types used for selection, the impact of different phage antibody library formats, and the specific selection protocols used.
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Affiliation(s)
- Yu Zhou
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
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9
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Abstract
Acute myeloid leukemia (AML) is a highly heterogenous disease with multiple signaling pathways contributing to its pathogenesis. A key driver of AML is the FMS-like tyrosine kinase receptor-3 (FLT3). Activating mutations in FLT3, primarily the FLT3-internal tandem duplication (FLT3-ITD), are associated with decreased progression-free and overall survival. Identification of the importance of FLT3-ITD and the FLT3 pathway in the prognosis of patients with AML has stimulated efforts to develop therapeutic inhibitors of FLT3. Although these inhibitors have shown promising antileukemic activity, they have had limited efficacy to date as single agents and may require use in combination with cytotoxic chemotherapies. Here, we review clinical and preclinical results for the clinically mature FLT3 inhibitors currently in development. We conclude that multitargeted FLT3 inhibitors may have more utility earlier in the course of disease, when in vitro evidence suggests that AML cells are less dependent on FLT3 signaling, perhaps because of upregulation of multiple other signaling pathways. More potent agents may have greater utility in relapsed and heavily pretreated patients, in whom high levels of circulating FLT3 ligand may necessitate use of an agent with a very favorable pharmacokinetic/pharmacodynamic profile. Novel combination regimens are also discussed.
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10
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Jamnani FR, Rahbarizadeh F, Shokrgozar MA, Ahmadvand D, Mahboudi F, Sharifzadeh Z. Targeting high affinity and epitope-distinct oligoclonal nanobodies to HER2 over-expressing tumor cells. Exp Cell Res 2012; 318:1112-24. [PMID: 22440788 DOI: 10.1016/j.yexcr.2012.03.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2011] [Revised: 03/02/2012] [Accepted: 03/05/2012] [Indexed: 01/20/2023]
Abstract
Modern anti-HER2 antibody therapy tends to exploit a panel of different antibodies against different epitopes on the antigen. For this aim, nanobodies are very striking targeting agents and can be easily produced against any cell-specific membrane antigen. The oligoclonal nanobodies can be used to block more than one functional epitope on a target antigen and inhibit the generation of escape variants associated with cancer therapy. In this study, 12 nanobody clones selected from an immune camel library were examined for their ability to differ between tumor markers. These oligoclonal nanobodies targeted breast cancer cells better than each individual nanobody. In epitope mapping, several nanobodies overlapped in the epitope recognized by trastuzumab and some of the non-overlapping nanobodies could affect the binding of trastuzumab to HER2. This study demonstrates that the oligoclonal nanobodies are potential therapeutic tools that can be used instead of, or in combination with trastuzumab to assess tumor viability during treatment.
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Abstract
Phage display has been extensively used to study protein-protein interactions, receptor- and antibody-binding sites, and immune responses, to modify protein properties, and to select antibodies against a wide range of different antigens. In the format most often used, a polypeptide is displayed on the surface of a filamentous phage by genetic fusion to one of the coat proteins, creating a chimeric coat protein, and coupling phenotype (the protein) to genotype (the gene within). As the gene encoding the chimeric coat protein is packaged within the phage, selection of the phage on the basis of the binding properties of the polypeptide displayed on the surface simultaneously results in the isolation of the gene encoding the polypeptide. This unit describes the background to the technique, and illustrates how it has been applied to a number of different problems, each of which has its neurobiological counterparts. Although this overview concentrates on the use of filamentous phage, which is the most popular platform, other systems are also described.
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12
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Kohlschütter J, Michelfelder S, Trepel M. Drug delivery in acute myeloid leukemia. Expert Opin Drug Deliv 2008; 5:653-63. [PMID: 18532921 DOI: 10.1517/17425247.5.6.653] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Acute myeloid leukemia was among the first malignancies to be cured by drug therapy alone, but overall survival rates remain unsatisfactory and have changed little over the past 20 years. Conventional chemotherapeutic regimens, which almost invariably include cytarabine and anthracyclines, are untargeted, and more specific therapies are needed. OBJECTIVE We have chosen acute myeloid leukemia as a disease prototype to review established and novel targeted approaches in leukemia treatment. METHODS Our selection of the reviewed literature focused on drug delivery aspects. CONCLUSION While the toxicity profile of chemotherapeutics has been improved by liposomal formulations and antibody conjugation for leukemia-directed uptake, their efficacy has probably not changed significantly. Drugs with an alternative mode of action, including kinase inhibitors, hold great promise. Further improvements may result from the characterization of novel acute myeloid leukemia (AML) cell surface receptors and of leukemic stem cells, as well as from the design of leukemia-targeted gene therapy vectors.
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Affiliation(s)
- Johannes Kohlschütter
- University Medical Center Hamburg-Eppendorf, Department of Oncology and Hematology, Martinistrasse 52, D-20246 Hamburg, Germany
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13
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Yuan QA, Robinson MK, Simmons HH, Russeva M, Adams GP. Isolation of anti-MISIIR scFv molecules from a phage display library by cell sorter biopanning. Cancer Immunol Immunother 2008; 57:367-78. [PMID: 17676323 PMCID: PMC11031043 DOI: 10.1007/s00262-007-0376-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2007] [Accepted: 07/13/2007] [Indexed: 10/23/2022]
Abstract
While cell surface antigens represent the most common targets for antibody-based cancer therapy, isolation of new antibodies specific for these targets from single-chain Fv phage display libraries has been hindered by limitations associated with traditional selection techniques. Solid phase panning is often associated with conformational changes to the target protein due to its immobilization on plastic tubes that can limit the ability of the isolated scFv to bind to conformational epitopes and solution panning methods require the use of secondary tags that often mask desired sequences and create unintended epitopes. Commonly utilized cell-based panning methods typically yield a panel of single-chain Fv (scFv) molecules that are specific for numerous cell surface antigens, often obscuring the desired clones. Here, we describe a novel cell sorter-based system to isolate single-chain Fv molecules specific for defined antigen targets expressed on stably-transformed mammalian cells. We employed these methods to isolate promising scFv clones that bind specifically to the Müllerian inhibiting substance type II receptor, a cell surface ovarian cancer antigen that has proven to be a difficult target for selection strategies.
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Affiliation(s)
- Qing-An Yuan
- Department of Medical Oncology, Fox Chase Cancer Center, 333 Cottman Ave, Philadelphia, PA 19111 USA
| | - Matthew K. Robinson
- Department of Medical Oncology, Fox Chase Cancer Center, 333 Cottman Ave, Philadelphia, PA 19111 USA
| | - Heidi H. Simmons
- Department of Medical Oncology, Fox Chase Cancer Center, 333 Cottman Ave, Philadelphia, PA 19111 USA
| | - Maria Russeva
- Department of Medical Oncology, Fox Chase Cancer Center, 333 Cottman Ave, Philadelphia, PA 19111 USA
| | - Gregory P. Adams
- Department of Medical Oncology, Fox Chase Cancer Center, 333 Cottman Ave, Philadelphia, PA 19111 USA
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14
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Wen WH, Qin WJ, Gao H, Zhao J, Jia LT, Liao QH, Meng YL, Jin BQ, Yao LB, Chen SY, Yang AG. An hepatitis B virus surface antigen specific single chain of variable fragment derived from a natural immune antigen binding fragment phage display library is specifically internalized by HepG2.2.15 cells. J Viral Hepat 2007; 14:512-9. [PMID: 17576393 DOI: 10.1111/j.1365-2893.2007.00843.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Hepatitis B virus surface antigen (HBsAg), a specific antigen on the membrane of hepatitis B virus (HBV)-infected cells, provides a perfect target for therapeutic drugs. In order to mediate successful targeted delivery of these therapies, it is essential to have antibodies that recognize HBsAg with high specificity and affinity. In this report, we constructed a natural immune antigen binding fragments (Fab) antibody phage display library against HBsAg and after three rounds of panning, five Fab fragments with significant HBsAg binding ability were selected and analysed. DNA sequencing revealed that all the light chains had the same sequence, while all the Fd genes exhibited different sequences. For further application, all of the Fab antibodies were reconstructed into single chain antibodies (scFvs) and expressed in Escherichia coli BL21 cells. Indirect enzyme-linked immunosorbent assay analysis demonstrated that all five scFvs maintained a high affinity for HBsAg and could bind HBsAg on the membrane of HBV-infected cells. Indirect fluorescent staining analysis revealed that one of the scFvs (scFv15) could be internalized into HBsAg-positive HepG2.2.15 cells through clathrin-mediated endocytosis pathway. The internalizing scFv15 antibody would have great potential for the targeted delivery of therapeutics to HBV-infected cells.
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Affiliation(s)
- W-H Wen
- State Key Laboratory of Cancer Biology, Department of Immunology, Fourth Military Medical University, Xi'an, China
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Jäger S, Jahnke A, Wilmes T, Adebahr S, Vögtle FN, Delima-Hahn E, Pfeifer D, Berg T, Lübbert M, Trepel M. Leukemia-targeting ligands isolated from phage-display peptide libraries. Leukemia 2007; 21:411-20. [PMID: 17252013 DOI: 10.1038/sj.leu.2404548] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Ligands specifically binding to leukemia cells may be used for drug targeting, resulting in more effective treatment with less side effects. Little is known about receptors specifically expressed on acute myeloid leukemia (AML) cells or ligands thereof. We selected random phage display peptide libraries on Kasumi-1 AML cells. A peptide with the sequence CPLDIDFYC was enriched. Phage displaying this peptide strongly bound to Kasumi-1 and SKNO-1 cells and binding could be inhibited by the cognate peptide. Both, Kasumi-1 and SKNO-1 cells carry the chromosomal translocation t(8;21), leading to aberrant expression of the fusion protein AML1/ETO. CPLDIDFYC also strongly and specifically bound primary AML1/ETO-positive AML blasts as well as U-937 cells with forced AML1/ETO expression, suggesting that the CPLDIDFYC receptor may be upregulated upon AML1/ETO expression. Gene expression profiling comparing a panel of CPLDIDFYC-binding and CPLDIDFYC-nonbinding cell lines identified a set of potential receptors for the CPLDIDFYC peptide. Further analysis suggested that alpha4beta1 integrin (VLA-4) is the CPLDIDFYC receptor. Finally, we showed that the CPLDIDFYC-phage is internalized upon receptor binding, suggesting that the CPLDIDFYC-receptor-ligand interaction may be exploitable for targeting drugs or gene therapy vectors to leukemia cells carrying the suitable receptor.
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MESH Headings
- Acute Disease
- Aged
- Cell Line, Tumor/metabolism
- Chromosomes, Human, Pair 21/genetics
- Chromosomes, Human, Pair 21/ultrastructure
- Chromosomes, Human, Pair 8/genetics
- Chromosomes, Human, Pair 8/ultrastructure
- Core Binding Factor Alpha 2 Subunit/genetics
- Core Binding Factor Alpha 2 Subunit/physiology
- Drug Delivery Systems
- Drug Screening Assays, Antitumor
- Endocytosis
- Female
- Gene Expression Profiling
- Genetic Therapy
- Humans
- Integrin alpha4beta1/antagonists & inhibitors
- Integrin alpha4beta1/metabolism
- Leukemia, Myeloid/genetics
- Leukemia, Myeloid/pathology
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/pathology
- Ligands
- Neoplasm Proteins/genetics
- Neoplasm Proteins/physiology
- Neoplastic Stem Cells/metabolism
- Oligopeptides/isolation & purification
- Oligopeptides/metabolism
- Oligopeptides/pharmacology
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/physiology
- Peptide Library
- Protein Binding
- RUNX1 Translocation Partner 1 Protein
- Receptors, Drug/antagonists & inhibitors
- Receptors, Drug/metabolism
- Translocation, Genetic
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Affiliation(s)
- S Jäger
- Department of Hematology and Oncology, University of Freiburg Medical Center, Freiburg, Germany
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17
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Fransson J, Tornberg UC, Borrebaeck CAK, Carlsson R, Frendéus B. Rapid induction of apoptosis in B-cell lymphoma by functionally isolated human antibodies. Int J Cancer 2006; 119:349-58. [PMID: 16477633 DOI: 10.1002/ijc.21829] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Novel panning and screening methodology was devised to isolate high affinity human recombinant scFv antibody fragments with functionally associated properties in B lymphoma cells. The approach was used to generate a panel of apoptosis-inducing antibodies specific for antigens differentially expressed in B lymphoma vs. T leukaemia cells. The selections resulted in an antibody pool with near perfect selectivity (>99%) for the B lymphoma target cells. Randomly picked clones (72) revealed 7 unique antibody genotypes. Six of these rapidly induced apoptosis in target cells. Following the conversion to full IgGs, the antibodies were shown to be specific for HLA-DR/DP, the B-cell receptor mu chain and for CD54/ICAM-1. The latter receptor was not previously associated with apoptotic properties in B-cell lymphomas. Anti-ICAM-1 IgG induced apoptosis in a broad range of B lymphoma cell lines and were shown by immunohistochemistry to bind strongly to B lymphoma tissue obtained from 5 different B lymphoma patients. The recombinant IgG antibodies had affinities in the subnanomolar (0.3 nM) to nanomolar (3 nM) range. The described technology is generally applicable for the rapid isolation of high affinity human antibodies with specificity for differentially expressed cell surface receptors with intrinsic negative or positive signalling properties from naïve phage libraries.
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Affiliation(s)
- Johan Fransson
- Department of Immunotechnology, Lund University, Lund, Sweden
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18
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Abstract
Despite major advances in the diagnosis and treatment of myelogenous leukaemia during the past few decades, this group of diseases remains a serious medical concern with > 15,000 new cases each year and a mortality rate of approximately 10,000 in the US alone. Current available conventional therapies, including chemotherapy and bone marrow transplantation, often cause severe side effects owing mainly to the lack of specificity of the treatment. In the past years, significant progress has been made towards understanding the pathogenesis of myelogenous leukaemia from the molecular standpoint. To this end, a growing number of approaches are being exploited for the identification and validation of new therapeutic targets suitable for more potent and specific or 'targeted' intervention. In this review, the authors focus their discussion on the four most promising myelogenous leukaemia-associated molecular targets currently being pursued by major pharmaceutical and biotechnology companies, fms-like tyrosine kinase 3 (FLT3), CD33, farnesyl transferase and BCR-Abl, with emphasis on recent progress on the clinical development of therapeutic agents, including both kinase inhibitors and monoclonal antibodies, to these targets.
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Affiliation(s)
- Keren Paz
- Department of Antibody Technology, ImClone Systems Incorporated, New York, NY 10014, USA
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19
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Abstract
Antibodies represent a unique class of therapeutics because of their high specificity toward a defined target antigen. Recent clinical success with antibody-based cancer therapeutics has led to an upsurge in the development of these agents. Antibodies directed against FLT3 represent a promising approach for the treatment of human leukemia. We discuss some basic aspects of antibody-based cancer therapeutics, including their mechanisms of action, with a focus on recent progress in the generation and development of anti-FLT3 antibodies as well as their therapeutic potentials in the treatment of human hematologic malignancies.
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Affiliation(s)
- Yiwen Li
- ImClone Systems Incorporated, New York, NY 10014, USA.
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