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Uras IZ, Sexl V, Kollmann K. CDK6 Inhibition: A Novel Approach in AML Management. Int J Mol Sci 2020; 21:ijms21072528. [PMID: 32260549 PMCID: PMC7178035 DOI: 10.3390/ijms21072528] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 03/29/2020] [Accepted: 04/02/2020] [Indexed: 02/01/2023] Open
Abstract
Acute myeloid leukemia (AML) is a complex disease with an aggressive clinical course and high mortality rate. The standard of care for patients has only changed minimally over the past 40 years. However, potentially useful agents have moved from bench to bedside with the potential to revolutionize therapeutic strategies. As such, cell-cycle inhibitors have been discussed as alternative treatment options for AML. In this review, we focus on cyclin-dependent kinase 6 (CDK6) emerging as a key molecule with distinct functions in different subsets of AML. CDK6 exerts its effects in a kinase-dependent and -independent manner which is of clinical significance as current inhibitors only target the enzymatic activity.
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Affiliation(s)
- Iris Z. Uras
- Department of Pharmacology, Center of Physiology and Pharmacology & Comprehensive Cancer Center (CCC), Medical University of Vienna, 1090 Vienna, Austria;
| | - Veronika Sexl
- Institute of Pharmacology and Toxicology, University of Veterinary Medicine, 1210 Vienna, Austria;
| | - Karoline Kollmann
- Institute of Pharmacology and Toxicology, University of Veterinary Medicine, 1210 Vienna, Austria;
- Correspondence: ; Tel.: + 43-1-25077-2917
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Tian J, Li Z, Han Y, Jiang T, Song X, Jiang G. The progress of early growth response factor 1 and leukemia. Intractable Rare Dis Res 2016; 5:76-82. [PMID: 27195189 PMCID: PMC4869586 DOI: 10.5582/irdr.2015.01049] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Early growth response gene-1 (EGR1) widely exists in the cell nucleus of such as, zebrafish, mice, chimpanzees and humans, an it also can be observed in the cytoplasm of some tumors. EGR1 was named just after its brief and rapid expression of different stimuli. Accumulating studies have extensively demonstrated that the widespread dysregulation of EGR1 is involved in hematological malignancies such as human acute myeloid leukemia (AML), chronic myelogenous leukemia, chronic lymphocytic leukemia, multiple myeloma, and B cell lymphoma. With the deep research on EGR1, its expression, function and regulatory mechanism has been gradually elucidated, and provides more possibilities for treatment strategies of patients with leukemia. Herein, we summarize the roles of EGR1 in its biological function and relationship with leukemia.
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Affiliation(s)
- Jing Tian
- Key Laboratory for Modern Medicine and Technology of Shandong Province, Institute of Basic Medicine, Shandong Academy of Medical Sciences, Ji'nan, Shandong, China
- School of Medicine and Life Sciences, Ji'nan University, Ji'nan, Shandong, China
| | - Ziwei Li
- Key Laboratory for Modern Medicine and Technology of Shandong Province, Institute of Basic Medicine, Shandong Academy of Medical Sciences, Ji'nan, Shandong, China
- School of Medicine and Life Sciences, Ji'nan University, Ji'nan, Shandong, China
| | - Yang Han
- Key Laboratory for Modern Medicine and Technology of Shandong Province, Institute of Basic Medicine, Shandong Academy of Medical Sciences, Ji'nan, Shandong, China
- School of Medicine and Life Sciences, Ji'nan University, Ji'nan, Shandong, China
| | - Tao Jiang
- Graduate School of Xuzhou Medical College, Xuzhou, Jiangsu, China
| | - Xiaoming Song
- Graduate School of Bengbu Medical College, Bengbu, Anhui, China
| | - Guosheng Jiang
- Key Laboratory for Modern Medicine and Technology of Shandong Province, Institute of Basic Medicine, Shandong Academy of Medical Sciences, Ji'nan, Shandong, China
- School of Medicine and Life Sciences, Ji'nan University, Ji'nan, Shandong, China
- Address correspondence to: Dr. Guosheng Jiang, Key Laboratory for rare & uncommon diseases of Shandong Province, Institute of Basic Medicine, Shandong Academy of Medical Sciences, NO.18877 of Jingshi Road, Ji'nan, Shandong, China. E-mail:
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Liu L, Liu L, Leung LH, Cooney AJ, Chen C, Rosengart TK, Ma Y, Yang J. Knockdown of SALL4 Protein Enhances All-trans Retinoic Acid-induced Cellular Differentiation in Acute Myeloid Leukemia Cells. J Biol Chem 2015; 290:10599-609. [PMID: 25737450 DOI: 10.1074/jbc.m114.634790] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Indexed: 11/06/2022] Open
Abstract
All-trans retinoic acid (ATRA) is a differentiation agent that revolutionized the treatment of acute promyelocytic leukemia. However, it has not been useful for other types of acute myeloid leukemia (AML). Here we explored the effect of SALL4, a stem cell factor, on ATRA-induced AML differentiation in both ATRA-sensitive and ATRA-resistant AML cells. Aberrant SALL4 expression has been found in nearly all human AML cases, whereas, in normal bone marrow and peripheral blood cells, its expression is only restricted to hematopoietic stem/progenitor cells. We reason that, in AMLs, SALL4 activation may prevent cell differentiation and/or protect self-renewal that is seen in normal hematopoietic stem/progenitor cells. Indeed, our studies show that ATRA-mediated myeloid differentiation can be largely blocked by exogenous expression of SALL4, whereas ATRA plus SALL4 knockdown causes significantly increased AML differentiation and cell death. Mechanistic studies indicate that SALL4 directly associates with retinoic acid receptor α and modulates ATRA target gene expression. SALL4 is shown to recruit lysine-specific histone demethylase 1 (LSD1) to target genes and alter the histone methylation status. Furthermore, coinhibition of LSD1 and SALL4 plus ATRA treatment exhibited the strongest anti-AML effect. These findings suggest that SALL4 plays an unfavorable role in ATRA-based regimes, highlighting an important aspect of leukemia therapy.
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Affiliation(s)
- Li Liu
- From the Departments of Surgery and
| | - Liang Liu
- the Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Macau 519020, China, and
| | - Lai-Han Leung
- the Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Macau 519020, China, and
| | - Austin J Cooney
- the Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas 77030
| | - Changyi Chen
- the Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas 77030
| | - Todd K Rosengart
- the Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas 77030
| | - Yupo Ma
- Pathology, State University of New York at Stony Brook, Stony Brook, New York 11794
| | - Jianchang Yang
- From the Departments of Surgery and Pathology, State University of New York at Stony Brook, Stony Brook, New York 11794,
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Ku M, Wall M, MacKinnon RN, Walkley CR, Purton LE, Tam C, Izon D, Campbell L, Cheng HC, Nandurkar H. Src family kinases and their role in hematological malignancies. Leuk Lymphoma 2015; 56:577-86. [PMID: 24898666 DOI: 10.3109/10428194.2014.907897] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The Src family protein tyrosine kinases (SFKs) are non-receptor intracellular kinases that have important roles in both hematopoiesis and leukemogenesis. The derangement of their expression or activation has been demonstrated to contribute to hematological malignancies. This review first examines the mechanisms of SFK overexpression and hyperactivation, emphasizing the dysregulation of the upstream modulators. Subsequently, the role of SFK up-regulation in the initiation, progression and therapy resistance of many hematological malignancies is also analyzed. The presented evidence endeavors to highlight the influence of SFK up-regulation on an extensive number of hematological malignancies and the need to consider them as candidates in targeted anticancer therapy.
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Affiliation(s)
- Matthew Ku
- Haematology Department and Victorian Cancer Cytogenetics Service, St Vincent's Hospital , Fitzroy , Australia
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Fraguas S, Barberán S, Iglesias M, Rodríguez-Esteban G, Cebrià F. egr-4, a target of EGFR signaling, is required for the formation of the brain primordia and head regeneration in planarians. Development 2014; 141:1835-47. [PMID: 24700819 DOI: 10.1242/dev.101345] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
During the regeneration of freshwater planarians, polarity and patterning programs play essential roles in determining whether a head or a tail regenerates at anterior or posterior-facing wounds. This decision is made very soon after amputation. The pivotal role of the Wnt/β-catenin and Hh signaling pathways in re-establishing anterior-posterior (AP) polarity has been well documented. However, the mechanisms that control the growth and differentiation of the blastema in accordance with its AP identity are less well understood. Previous studies have described a role of Smed-egfr-3, a planarian epidermal growth factor receptor, in blastema growth and differentiation. Here, we identify Smed-egr-4, a zinc-finger transcription factor belonging to the early growth response gene family, as a putative downstream target of Smed-egfr-3. Smed-egr-4 is mainly expressed in the central nervous system and its silencing inhibits anterior regeneration without affecting the regeneration of posterior regions. Single and combinatorial RNA interference to target different elements of the Wnt/β-catenin pathway, together with expression analysis of brain- and anterior-specific markers, revealed that Smed-egr-4: (1) is expressed in two phases - an early Smed-egfr-3-independent phase and a late Smed-egfr-3-dependent phase; (2) is necessary for the differentiation of the brain primordia in the early stages of regeneration; and (3) that it appears to antagonize the activity of the Wnt/β-catenin pathway to allow head regeneration. These results suggest that a conserved EGFR/egr pathway plays an important role in cell differentiation during planarian regeneration and indicate an association between early brain differentiation and the proper progression of head regeneration.
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Affiliation(s)
- Susanna Fraguas
- Departament de Genètica de la Universitat de Barcelona and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Avenida Diagonal 643, Edifici Prevosti planta 1, Barcelona 08028, Spain
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Fu L, Huang W, Jing Y, Jiang M, Zhao Y, Shi J, Huang S, Xue X, Zhang Q, Tang J, Dou L, Wang L, Nervi C, Li Y, Yu L. AML1-ETO triggers epigenetic activation of early growth response gene l, inducing apoptosis in t(8;21) acute myeloid leukemia. FEBS J 2014; 281:1123-31. [PMID: 24314118 DOI: 10.1111/febs.12673] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Revised: 11/06/2013] [Accepted: 12/02/2013] [Indexed: 11/30/2022]
Abstract
The t(8;21)(q22;q22) translocation is the most common chromosomal translocation in acute myeloid leukemia (AML), and it gives rise to acute myeloid gene 1 (AML1)-myeloid transforming gene 8 (ETO)-positive AML, which has a relatively favorable prognosis. However, the molecular mechanism related to a favorable prognosis in AML1-ETO-positive AML is still not fully understood. Our results show that the AML1-ETO fusion protein triggered activation of early growth response gene l (EGR1) by binding at AML1-binding sites on the EGR1 promoter and, subsequently, recruiting acetyltransferase P300, which is known to acetylate histones. However, AML1-ETO could not recruit DNA methyltransferases and histone deacetylases; therefore, EGR1 expression was affected by histone acetylation but not by DNA methylation. Both transcription and translation of EGR1 were higher in AML1-ETO-positive AML cell lines than in AML1-ETO-negative AML cell lines, owing to acetylation. Furthermore, when AML1-ETO-positive AML cell lines were treated with C646 (P300 inhibitor) and trichostatin A (histone deacetylase inhibitor), EGR1 expression was significantly decreased and increased, respectively. In addition, treatment with 5-azacytidine (methyltransferase inhibitor) did not cause any significant change in EGR1 expression. Overexpression of EGR1 inhibited cell proliferation and promoted apoptosis, and EGR1 knockout promoted cell proliferation. Thus, EGR1 could be a novel prognostic factor for a favorable outcome in AML1-ETO-positive AML. The results of our study may explain the molecular mechanisms underlying the favorable prognosis in AML1-ETO-positive AML.
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Affiliation(s)
- Lin Fu
- Department of Hematology, Chinese PLA General Hospital, Beijing, China; Nankai University School of Medicine, Tianjin, China
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Lainey E, Wolfromm A, Sukkurwala AQ, Micol JB, Fenaux P, Galluzzi L, Kepp O, Kroemer G. EGFR inhibitors exacerbate differentiation and cell cycle arrest induced by retinoic acid and vitamin D3 in acute myeloid leukemia cells. Cell Cycle 2013; 12:2978-91. [PMID: 23974111 DOI: 10.4161/cc.26016] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
By means of an unbiased, automated fluorescence microscopy-based screen, we identified the epidermal growth factor receptor (EGFR) inhibitors erlotinib and gefitinib as potent enhancers of the differentiation of HL-60 acute myeloid leukemia (AML) cells exposed to suboptimal concentrations of vitamin A (all-trans retinoic acid, ATRA) or vitamin D (1α,25-hydroxycholecalciferol, VD). Erlotinib and gefitinib alone did not promote differentiation, yet stimulated the acquisition of morphological and biochemical maturation markers (including the expression of CD11b and CD14 as well as increased NADPH oxidase activity) when combined with either ATRA or VD. Moreover, the combination of erlotinib and ATRA or VD synergistically induced all the processes that are normally linked to terminal hematopoietic differentiation, namely, a delayed proliferation arrest in the G0/G1 phase of the cell cycle, cellular senescence, and apoptosis. Erlotinib potently inhibited the (auto)phosphorylation of mitogen-activated protein kinase 14 (MAPK14, best known as p38(MAPK)) and SRC family kinases (SFKs). If combined with the administration of ATRA or VD, the inhibition of p38(MAPK) or SFKs with specific pharmacological agents mimicked the pro-differentiation activity of erlotinib. These data were obtained with 2 distinct AML cell lines (HL-60 and MOLM-13 cells) and could be confirmed on primary leukemic blasts isolated from the circulation of AML patients. Altogether, these findings point to a new regimen for the treatment of AML, in which naturally occurring pro-differentiation agents (ATRA or VD) may be combined with EGFR inhibitors.
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Affiliation(s)
- Elodie Lainey
- INSERM; U848; Villejuif, France; Gustave Roussy; Villejuif, France; Université Paris Sud/Paris XI; Le Kremlin Bicêtre, France; Hôpital Robert Debré; AP-HP; Paris, France
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Chen-Deutsch X, Studzinski GP. Dual role of hematopoietic progenitor kinase 1 (HPK1) as a positive regulator of 1α,25-dihydroxyvitamin D-induced differentiation and cell cycle arrest of AML cells and as a mediator of vitamin D resistance. Cell Cycle 2012; 11:1364-73. [PMID: 22421156 DOI: 10.4161/cc.19765] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Recent clinical trials aimed at improved treatment of AML by administration of vitamin D derivatives showed unremarkable results, suggesting development of vitamin D resistance in patients' AML blasts. Since mechanisms of vitamin D resistance are not clear, we studied 40AF cells, a subline of HL60 cells that can proliferate in the presence of 1α,25-dihydroxyvitamin D₃ (1,25D). We found that mRNA and protein levels of HPK1, an upstream MAP4 kinase, are dramatically increased in 40AF cells, and HPK1 protein is further increased when the 1,25D resistance of 40AF cells is partially reversed by the addition of carnosic acid and p38MAPK inhibitor SB202190 (DCS cocktail). Knockdown of HPK1 reduces 1,25D/DCS-induced differentiation of both 1,25D-sensitive HL60 and U937 cells and 1,25D-resistant 40AF cells, but the effect of HPK1 knockdown on differentiation-associated G 1 arrest is more apparent in the resistant than the sensitive cells. To explain why 40AF and the intrinsically vitamin D-resistant KG-1a cells can proliferate in the presence of vitamin D, we found that the cleaved HPK1 fragment (HPK1-C) level is high in 40AF and KG-1a cells, but when differentiation is induced by DCS, HPK1-C decreases while full-length (FL)-HPK1 increases. Accordingly, inhibition of proteolysis with the pan-caspase inhibitor Q-VD-OPh reduced HPK1 cleavage and enhanced DCS-induced differentiation of 40AF cells. The results indicate that FL-HPK1 is a positive regulator of vitamin D-induced differentiation in AML cells, but the cleaved HPK1 fragment inhibits differentiation. Thus, high HPK1 cleavage activity contributes to vitamin D resistance, and HPK1 has a dual role in AML cell differentiation.
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Affiliation(s)
- Xiangwen Chen-Deutsch
- Department of Pathology and Laboratory Medicine, UMDNJ-New Jersey Medical School, Newark, NJ, USA
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