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Mitrovský O, Myslivcová D, Macháčková-Lopotová T, Obr A, Čermáková K, Ransdorfová Š, Březinová J, Klamová H, Žáčková M. Inhibition of casein kinase 2 induces cell death in tyrosine kinase inhibitor resistant chronic myelogenous leukemia cells. PLoS One 2023; 18:e0284876. [PMID: 37141212 PMCID: PMC10159124 DOI: 10.1371/journal.pone.0284876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 04/11/2023] [Indexed: 05/05/2023] Open
Abstract
Chronic myelogenous leukemia (CML) is a myeloproliferative disease characterized by the BCR-ABL oncogene. Despite the high performance of treatment with tyrosine kinase inhibitors (TKI), about 30% of patients develop resistance to the therapy. To improve the outcomes, identification of new targets of treatment is needed. Here, we explored the Casein Kinase 2 (CK2) as a potential target for CML therapy. Previously, we detected increased phosphorylation of HSP90β Serine 226 in patients non-responding to TKIs imatinib and dasatinib. This site is known to be phosphorylated by CK2, which was also linked to CML resistance to imatinib. In the present work, we established six novel imatinib- and dasatinib-resistant CML cell lines, all of which had increased CK2 activation. A CK2 inhibitor, CX-4945, induced cell death of CML cells in both parental and resistant cell lines. In some cases, CK2 inhibition also potentiated the effects of TKI on the cell metabolic activity. No effects of CK2 inhibition were observed in normal mononuclear blood cells from healthy donors and BCR-ABL negative HL60 cell line. Our data indicate that CK2 kinase supports CML cell viability even in cells with different mechanisms of resistance to TKI, and thus represents a potential target for treatment.
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Affiliation(s)
- Ondřej Mitrovský
- Department of Proteomics, Institute of Hematology and Blood Transfusion, Prague 2, Czech Republic
- Faculty of Science, Charles University, Prague, Czech Republic
| | - Denisa Myslivcová
- Department of Proteomics, Institute of Hematology and Blood Transfusion, Prague 2, Czech Republic
| | | | - Adam Obr
- Department of Proteomics, Institute of Hematology and Blood Transfusion, Prague 2, Czech Republic
| | - Kamila Čermáková
- Laboratory of PCR Diagnostics of Leukemias, Institute of Hematology and Blood Transfusion, Prague 2, Czech Republic
| | - Šárka Ransdorfová
- Department of Cytogenetics, Institute of Hematology and Blood Transfusion, Prague 2, Czech Republic
| | - Jana Březinová
- Department of Cytogenetics, Institute of Hematology and Blood Transfusion, Prague 2, Czech Republic
| | - Hana Klamová
- Clinical Division, Institute of Hematology and Blood Transfusion, Prague 2, Czech Republic
| | - Markéta Žáčková
- Department of Proteomics, Institute of Hematology and Blood Transfusion, Prague 2, Czech Republic
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Sano K, Iwasaki Y, Yamashita Y, Irie K, Hosokawa M, Satoh K, Mishima K. Tyrosine 136 phosphorylation of α-synuclein aggregates in the Lewy body dementia brain: involvement of serine 129 phosphorylation by casein kinase 2. Acta Neuropathol Commun 2021; 9:182. [PMID: 34772466 PMCID: PMC8590312 DOI: 10.1186/s40478-021-01281-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Accepted: 10/22/2021] [Indexed: 11/10/2022] Open
Abstract
Serine 129 (S129) phosphorylation of α-synuclein (αSyn) is a central feature of Lewy body (LB) disease pathology. Although the neighboring tyrosine residues Y125, Y133, and Y136 are also phosphorylation sites, little is known regarding potential roles of phosphorylation cross-talk between these sites and its involvement in the pathogenesis of LB disease. Here, we found that αSyn aggregates are predominantly phosphorylated at Y136 in the Lewy body dementia brain, which is mediated by unexpected kinase activity of Casein kinase 2 (CK2). Aggregate formation with S129 and Y136 phosphorylation of recombinant αSyn (r-αSyn) were induced by CK2 but abolished by replacement of S129 with alanine (S129A) in vitro. Mutation of Y136 to alanine (Y136A) promoted aggregate formation and S129 phosphorylation of r-αSyn by CK2 in vitro. Introduction of Y136A r-αSyn oligomers into cultured cells exhibited increased levels of aggregates with S129 phosphorylation compared to wild-type r-αSyn oligomers. In addition, aggregate formation with S129 phosphorylation induced by introduction of wild-type r-αSyn oligomers was significantly attenuated by CK2 inhibition, which resulted in an unexpected increase in Y136 phosphorylation in cultured cells. Our findings suggest the involvement of CK2-related αSyn Y136 phosphorylation in the pathogenesis of LB disease and its potential as a therapeutic target.
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Affiliation(s)
- Kazunori Sano
- Department of Physiology and Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180 Japan
| | - Yasushi Iwasaki
- Department of Neuropathology, Institute for Medical Science of Aging, Aichi Medical University, Aichi, 480-1195 Japan
| | - Yuta Yamashita
- Department of Physiology and Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180 Japan
| | - Keiichi Irie
- Department of Physiology and Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180 Japan
| | - Masato Hosokawa
- Department of Immunological and Molecular Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, 814-0180 Japan
| | - Katsuya Satoh
- Department of Health Sciences, Unit of Medical and Dental Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, 852-8523 Japan
| | - Kenichi Mishima
- Department of Physiology and Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180 Japan
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Pathak HB, Zhou Y, Sethi G, Hirst J, Schilder RJ, Golemis EA, Godwin AK. A Synthetic Lethality Screen Using a Focused siRNA Library to Identify Sensitizers to Dasatinib Therapy for the Treatment of Epithelial Ovarian Cancer. PLoS One 2015; 10:e0144126. [PMID: 26637171 PMCID: PMC4670180 DOI: 10.1371/journal.pone.0144126] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Accepted: 11/15/2015] [Indexed: 02/07/2023] Open
Abstract
Molecular targeted therapies have been the focus of recent clinical trials for the treatment of patients with recurrent epithelial ovarian cancer (EOC). The majority have not fared well as monotherapies for improving survival of these patients. Poor bioavailability, lack of predictive biomarkers, and the presence of multiple survival pathways can all diminish the success of a targeted agent. Dasatinib is a tyrosine kinase inhibitor of the Src-family kinases (SFK) and in preclinical studies shown to have substantial activity in EOC. However, when evaluated in a phase 2 clinical trial for patients with recurrent or persistent EOC, it was found to have minimal activity. We hypothesized that synthetic lethality screens performed using a cogently designed siRNA library would identify second-site molecular targets that could synergize with SFK inhibition and improve dasatinib efficacy. Using a systematic approach, we performed primary siRNA screening using a library focused on 638 genes corresponding to a network centered on EGFR, HER2, and the SFK-scaffolding proteins BCAR1, NEDD9, and EFS to screen EOC cells in combination with dasatinib. We followed up with validation studies including deconvolution screening, quantitative PCR to confirm effective gene silencing, correlation of gene expression with dasatinib sensitivity, and assessment of the clinical relevance of hits using TCGA ovarian cancer data. A refined list of five candidates (CSNK2A1, DAG1, GRB2, PRKCE, and VAV1) was identified as showing the greatest potential for improving sensitivity to dasatinib in EOC. Of these, CSNK2A1, which codes for the catalytic alpha subunit of protein kinase CK2, was selected for additional evaluation. Synergistic activity of the clinically relevant inhibitor of CK2, CX-4945, with dasatinib in reducing cell proliferation and increasing apoptosis was observed across multiple EOC cell lines. This overall approach to improving drug efficacy can be applied to other targeted agents that have similarly shown poor clinical activity.
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Affiliation(s)
- Harsh B. Pathak
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, Kansas, United States of America
- University of Kansas Cancer Center, Kansas City, Kansas, United States of America
- * E-mail:
| | - Yan Zhou
- Biostatistics and Bioinformatics Facility, Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States of America
| | - Geetika Sethi
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Jeff Hirst
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, Kansas, United States of America
| | - Russell J. Schilder
- Department of Gynecologic Medical Oncology, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Erica A. Golemis
- Molecular Therapeutics Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States of America
| | - Andrew K. Godwin
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, Kansas, United States of America
- University of Kansas Cancer Center, Kansas City, Kansas, United States of America
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Xue M, Momiji H, Rabbani N, Barker G, Bretschneider T, Shmygol A, Rand DA, Thornalley PJ. Frequency Modulated Translocational Oscillations of Nrf2 Mediate the Antioxidant Response Element Cytoprotective Transcriptional Response. Antioxid Redox Signal 2015; 23:613-29. [PMID: 25178584 PMCID: PMC4556091 DOI: 10.1089/ars.2014.5962] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Revised: 08/14/2014] [Accepted: 08/31/2014] [Indexed: 12/20/2022]
Abstract
AIMS Stress responsive signaling coordinated by nuclear factor erythroid 2-related factor 2 (Nrf2) provides an adaptive response for protection of cells against toxic insults, oxidative stress and metabolic dysfunction. Nrf2 regulates a battery of protective genes by binding to regulatory antioxidant response elements (AREs). The aim of this study was to examine how Nrf2 signals cell stress status and regulates transcription to maintain homeostasis. RESULTS In live cell microscopy we observed that Nrf2 undergoes autonomous translocational frequency-modulated oscillations between cytoplasm and nucleus. Oscillations occurred in quiescence and when cells were stimulated at physiological levels of activators, they decrease in period and amplitude and then evoke a cytoprotective transcriptional response. We propose a mechanism whereby oscillations are produced by negative feedback involving successive de-phosphorylation and phosphorylation steps. Nrf2 was inactivated in the nucleus and reactivated on return to the cytoplasm. Increased frequency of Nrf2 on return to the cytoplasm with increased reactivation or refresh-rate under stress conditions activated the transcriptional response mediating cytoprotective effects. The serine/threonine-protein phosphatase PGAM5, member of the Nrf2 interactome, was a key regulatory component. INNOVATION We found that Nrf2 is activated in cells without change in total cellular Nrf2 protein concentration. Regulation of ARE-linked protective gene transcription occurs rather through translocational oscillations of Nrf2. We discovered cytoplasmic refresh rate of Nrf2 is important in maintaining and regulating the transcriptional response and links stress challenge to increased cytoplasmic surveillance. We found silencing and inhibition of PGAM5 provides potent activation of Nrf2. CONCLUSION Frequency modulated translocational oscillations of Nrf2 mediate the ARE-linked cytoprotective transcriptional response.
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Affiliation(s)
- Mingzhan Xue
- Clinical Sciences Research Laboratories, Warwick Medical School, University Hospital, University of Warwick, Coventry, United Kingdom
| | - Hiroshi Momiji
- Warwick Systems Biology Centre, University of Warwick, Coventry, United Kingdom
| | - Naila Rabbani
- Clinical Sciences Research Laboratories, Warwick Medical School, University Hospital, University of Warwick, Coventry, United Kingdom
- Warwick Systems Biology Centre, University of Warwick, Coventry, United Kingdom
| | - Guy Barker
- School of Life Sciences, University of Warwick, Wellesbourne, United Kingdom
| | - Till Bretschneider
- Warwick Systems Biology Centre, University of Warwick, Coventry, United Kingdom
| | - Anatoly Shmygol
- Clinical Sciences Research Laboratories, Warwick Medical School, University Hospital, University of Warwick, Coventry, United Kingdom
| | - David A. Rand
- Warwick Systems Biology Centre, University of Warwick, Coventry, United Kingdom
| | - Paul J. Thornalley
- Clinical Sciences Research Laboratories, Warwick Medical School, University Hospital, University of Warwick, Coventry, United Kingdom
- Warwick Systems Biology Centre, University of Warwick, Coventry, United Kingdom
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Kim J, Hwan Kim S. CK2 inhibitor CX-4945 blocks TGF-β1-induced epithelial-to-mesenchymal transition in A549 human lung adenocarcinoma cells. PLoS One 2013; 8:e74342. [PMID: 24023938 PMCID: PMC3762800 DOI: 10.1371/journal.pone.0074342] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Accepted: 08/01/2013] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND The epithelial-to-mesenchymal transition (EMT) is a major phenotype of cancer metastasis and invasion. As a druggable cancer target, the inhibition of protein kinase CK2 (formally named to casein kinase 2) has been suggested as a promising therapeutic strategy to treat EMT-controlled cancer metastasis. This study aimed to evaluate the effect of the CK2 inhibitor CX-4945 on the processes of cancer migration and invasion during the EMT in A549 human lung adenocarcinoma cells. MATERIALS AND METHODS The effect of CX-4945 on TGF-β1-induced EMT was evaluated in A549 cells treated with TGF-β1 (5 ng/ml) and CX-4945. The effect of CX-4945 on TGF-β1-induced cadherin switch and activation of key signaling molecules involved in Smad, non-Smad, Wnt and focal adhesion signaling pathways were investigated by Western blot analysis, immunocytochemistry and reporter assay. Additionally, the effect of CX-4945 on TGF-β1-induced migration and invasion was investigated by wound healing assay, Boyden chamber assay, gelatin zymography, and the quantitative real-time PCR. RESULTS CX-4945 inhibits the TGF-β1-induced cadherin switch and the activation of key signaling molecules involved in Smad (Smad2/3, Twist and Snail), non-Smad (Akt and Erk), Wnt (β-catenin) and focal adhesion signaling pathways (FAK, Src and paxillin) that cooperatively regulate the overall process of EMT. As a result, CX-4945 inhibits the migration and invasion of A549 cells accompanied with the downregulation of MMP-2 and 9. CONCLUSIONS Clinical evaluation of CX-4945 in humans as a single agent in solid tumors and multiple myeloma has established its promising pharmacokinetic, pharmacodynamic, and safety profiles. Beyond regression of tumor mass, CX-4945 may be advanced as a new therapy for cancer metastasis and EMT-related disorders.
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Affiliation(s)
- Jiyeon Kim
- Laboratory of Translational Therapeutics, Pharmacology Research Center, Division of Drug Discovery Research, Korea Research Institute of Chemical Technology, Yuseong-gu, Daejeon, Republic of Korea
| | - Seong Hwan Kim
- Laboratory of Translational Therapeutics, Pharmacology Research Center, Division of Drug Discovery Research, Korea Research Institute of Chemical Technology, Yuseong-gu, Daejeon, Republic of Korea
- * E-mail:
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Pahujaa M, Anikin M, Goldberg GS. Phosphorylation of connexin43 induced by Src: regulation of gap junctional communication between transformed cells. Exp Cell Res 2007; 313:4083-90. [PMID: 17956757 DOI: 10.1016/j.yexcr.2007.09.010] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2007] [Revised: 09/06/2007] [Accepted: 09/06/2007] [Indexed: 01/14/2023]
Abstract
Cx43 is a widely expressed gap junction protein that mediates communication between many cell types. In general, tumor cells display less intercellular communication than their nontransformed precursors. The Src tyrosine kinase has been implicated in progression of a wide variety of cancers. Src can phosphorylate Cx43, and this event is associated with the suppression of gap junction communication. However, Src activates multiple signaling pathways that can also affect intercellular communication. For example, serine kinases including PKC and MAPK are downstream effectors of Src that can also phosphorylate Cx43 and disrupt gap junctional communication. In addition, Src can affect the expression of other proteins that may affect intercellular communication. Indeed, disruption of gap junctions by Src appears to be complex. It has become clear that Src can affect Cx43 activity by multiple mechanisms. Here, we review how Src may orchestrate events that regulate intercellular communication mediated by Cx43.
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Affiliation(s)
- Madhuri Pahujaa
- Department of Cell Biology, University of Medicine and Dentistry of New Jersey, Science Center, 2 Medical Center Dr., Stratford, NJ 08084, USA
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