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Qin Z, Wang R, Hou P, Zhang Y, Yuan Q, Wang Y, Yang Y, Xu T. TCR signaling induces STAT3 phosphorylation to promote TH17 cell differentiation. J Exp Med 2024; 221:e20230683. [PMID: 38324068 PMCID: PMC10849914 DOI: 10.1084/jem.20230683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 08/11/2023] [Accepted: 01/18/2024] [Indexed: 02/08/2024] Open
Abstract
TH17 differentiation is critically controlled by "signal 3" of cytokines (IL-6/IL-23) through STAT3. However, cytokines alone induced only a moderate level of STAT3 phosphorylation. Surprisingly, TCR stimulation alone induced STAT3 phosphorylation through Lck/Fyn, and synergistically with IL-6/IL-23 induced robust and optimal STAT3 phosphorylation at Y705. Inhibition of Lck/Fyn kinase activity by Srci1 or disrupting the interaction between Lck/Fyn and STAT3 by disease-causing STAT3 mutations selectively impaired TCR stimulation, but not cytokine-induced STAT3 phosphorylation, which consequently abolished TH17 differentiation and converted them to FOXP3+ Treg cells. Srci1 administration or disrupting the interaction between Lck/Fyn and STAT3 significantly ameliorated TH17 cell-mediated EAE disease. These findings uncover an unexpected deterministic role of TCR signaling in fate determination between TH17 and Treg cells through Lck/Fyn-dependent phosphorylation of STAT3, which can be exploited to develop therapeutics selectively against TH17-related autoimmune diseases. Our study thus provides insight into how TCR signaling could integrate with cytokine signal to direct T cell differentiation.
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Affiliation(s)
- Zhen Qin
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Ruining Wang
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Ping Hou
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Yuanyuan Zhang
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Qianmu Yuan
- School of Computer Science and Engineering, Sun Yat-sen University, Guangzhou, China
| | - Ying Wang
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Yuedong Yang
- School of Computer Science and Engineering, Sun Yat-sen University, Guangzhou, China
| | - Tao Xu
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
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Kim C, Ludewig H, Hadzipasic A, Kutter S, Nguyen V, Kern D. A biophysical framework for double-drugging kinases. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.17.533217. [PMID: 36993258 PMCID: PMC10055307 DOI: 10.1101/2023.03.17.533217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Orthosteric inhibition of kinases has been challenging due to the conserved active site architecture of kinases and emergence of resistance mutants. Simultaneous inhibition of distant orthosteric and allosteric sites, which we refer to as "double-drugging", has recently been shown to be effective in overcoming drug resistance. However, detailed biophysical characterization of the cooperative nature between orthosteric and allosteric modulators has not been undertaken. Here, we provide a quantitative framework for double-drugging of kinases employing isothermal titration calorimetry, Förster resonance energy transfer, coupled-enzyme assays, and X-ray crystallography. We discern positive and negative cooperativity for Aurora A kinase (AurA) and Abelson kinase (Abl) with different combinations of orthosteric and allosteric modulators. We find that a conformational equilibrium shift is the main principle governing this cooperative effect. Notably, for both kinases, we find a synergistic decrease of the required orthosteric and allosteric drug dosages when used in combination to inhibit kinase activities to clinically relevant inhibition levels. X-ray crystal structures of the doubledrugged kinase complexes reveal the molecular principles underlying the cooperative nature of double-drugging AurA and Abl with orthosteric and allosteric inhibitors. Finally, we observe the first fully-closed conformation of Abl when bound to a pair of positively cooperative orthosteric and allosteric modulators, shedding light onto the puzzling abnormality of previously solved closed Abl structures. Collectively, our data provide mechanistic and structural insights into rational design and evaluation of doubledrugging strategies.
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Affiliation(s)
- C. Kim
- Department of Biochemistry, Brandeis University and Howard Hughes Medical Institute, Waltham, MA 02454, USA
| | - H. Ludewig
- Department of Biochemistry, Brandeis University and Howard Hughes Medical Institute, Waltham, MA 02454, USA
| | - A. Hadzipasic
- Department of Biochemistry, Brandeis University and Howard Hughes Medical Institute, Waltham, MA 02454, USA
| | - S. Kutter
- Department of Biochemistry, Brandeis University and Howard Hughes Medical Institute, Waltham, MA 02454, USA
| | - V. Nguyen
- Department of Biochemistry, Brandeis University and Howard Hughes Medical Institute, Waltham, MA 02454, USA
| | - D. Kern
- Department of Biochemistry, Brandeis University and Howard Hughes Medical Institute, Waltham, MA 02454, USA
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Araki T, Watanabe Y, Okada Y, Murakami H, Ogo N, Asai A. Identification of serum and glucocorticoid-regulated kinase 1 as a regulator of signal transducer and activator of transcription 3 signaling. Exp Cell Res 2022; 413:113079. [PMID: 35202674 DOI: 10.1016/j.yexcr.2022.113079] [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: 10/18/2021] [Revised: 12/20/2021] [Accepted: 02/11/2022] [Indexed: 11/18/2022]
Abstract
Signal transducer and activator of transcription 3 (STAT3) plays key roles in cancer cell proliferation, invasion, and immunosuppression. In many human cancer cells, STAT3 is hyperactivated, which leads to tumor progression and drug resistance, and therefore STAT3 and its modulators are considered effective drug targets. However, the complex regulatory mechanisms of STAT3 have made it difficult to develop potent anticancer drugs that suppress its activity. Here, we report serum and glucocorticoid-regulated kinase 1 (SGK1) as a novel regulator of STAT3 signaling and an effective target for combination therapy with Janus kinase (JAK) inhibitors. We screened small molecules using a gain-of-function mutant of STAT3 resistant to JAK inhibition and found that an SGK1 inhibitor suppressed the constitutive activation of STAT3. Importantly, our results revealed that SGK1 also mediated the activation of wild-type STAT3. Further examination suggested that the tuberous sclerosis complex 2 and mammalian target of rapamycin signaling pathway were involved in STAT3 activation by SGK1. Finally, we demonstrated that SGK1 inhibition enhanced the inhibitory effect of a JAK inhibitor on STAT3 phosphorylation and cancer cell proliferation. Our findings provide new insights into the molecular mechanisms of STAT3 activation and suggest SGK1 as a potential target for STAT3-targeted combination cancer therapy.
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Affiliation(s)
- Toshihiro Araki
- Center for Drug Discovery, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Suruga-ku, Shizuoka, Shizuoka, Japan; Discovery Technology Laboratories, Sohyaku. Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, Muraoka-Higashi, Fujisawa, Kanagawa, Japan
| | - Yuuki Watanabe
- Center for Drug Discovery, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Suruga-ku, Shizuoka, Shizuoka, Japan; Public Affairs and Policy Department, Mitsubishi Tanabe Pharma Corporation, Marunouchi, Chiyoda-ku, Tokyo, Japan
| | - Yusuke Okada
- Sohyaku Project Planning & Management Department, Sohyaku Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, Marunouchi, Chiyoda-ku, Tokyo, Japan
| | - Hisashi Murakami
- Center for Drug Discovery, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Suruga-ku, Shizuoka, Shizuoka, Japan
| | - Naohisa Ogo
- Center for Drug Discovery, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Suruga-ku, Shizuoka, Shizuoka, Japan
| | - Akira Asai
- Center for Drug Discovery, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Suruga-ku, Shizuoka, Shizuoka, Japan.
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Wei LY, Lin W, Leo BF, Kiew LV, Chang CC, Yuan CJ. Development of the Sensing Platform for Protein Tyrosine Kinase Activity. BIOSENSORS-BASEL 2021; 11:bios11070240. [PMID: 34356711 PMCID: PMC8301957 DOI: 10.3390/bios11070240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/12/2021] [Accepted: 07/13/2021] [Indexed: 12/02/2022]
Abstract
A miniature tyrosinase-based electrochemical sensing platform for label-free detection of protein tyrosine kinase activity was developed in this study. The developed miniature sensing platform can detect the substrate peptides for tyrosine kinases, such as c-Src, Hck and Her2, in a low sample volume (1–2 μL). The developed sensing platform exhibited a high reproducibility for repetitive measurement with an RSD (relative standard deviation) of 6.6%. The developed sensing platform can detect the Hck and Her2 in a linear range of 1–200 U/mL with the detection limit of 1 U/mL. The sensing platform was also effective in assessing the specificity and efficacies of the inhibitors for protein tyrosine kinases. This is demonstrated by the detection of significant inhibition of Hck (~88.1%, but not Her2) by the Src inhibitor 1, an inhibitor for Src family kinases, as well as the significant inhibition of Her2 (~91%, but not Hck) by CP-724714 through the platform. These results suggest the potential of the developed miniature sensing platform as an effective tool for detecting different protein tyrosine kinase activity and for accessing the inhibitory effect of various inhibitors to these kinases.
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Affiliation(s)
- Lan-Yi Wei
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan; (L.-Y.W.); (W.L.); (L.-V.K.); (C.-C.C.)
| | - Wei Lin
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan; (L.-Y.W.); (W.L.); (L.-V.K.); (C.-C.C.)
| | - Bey-Fen Leo
- Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia;
- Taiwan-Malaysia Semiconductor and Biomedical Oversea Science and Technology Innovation Center, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan
| | - Lik-Voon Kiew
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan; (L.-Y.W.); (W.L.); (L.-V.K.); (C.-C.C.)
- Taiwan-Malaysia Semiconductor and Biomedical Oversea Science and Technology Innovation Center, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan
- Department of Pharmacology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Chia-Ching Chang
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan; (L.-Y.W.); (W.L.); (L.-V.K.); (C.-C.C.)
- Taiwan-Malaysia Semiconductor and Biomedical Oversea Science and Technology Innovation Center, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan
- Center for Intelligent Drug Systems and Smart Bio-devices (IDS2B), National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan
- Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - Chiun-Jye Yuan
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan; (L.-Y.W.); (W.L.); (L.-V.K.); (C.-C.C.)
- Taiwan-Malaysia Semiconductor and Biomedical Oversea Science and Technology Innovation Center, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan
- Center for Intelligent Drug Systems and Smart Bio-devices (IDS2B), National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan
- Institute of Molecular Medicine and Bioengineering, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan
- Correspondence: ; Tel.: +886-3-573-1735
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Mo GCH, Posner C, Rodriguez EA, Sun T, Zhang J. A rationally enhanced red fluorescent protein expands the utility of FRET biosensors. Nat Commun 2020; 11:1848. [PMID: 32296061 PMCID: PMC7160135 DOI: 10.1038/s41467-020-15687-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 03/20/2020] [Indexed: 11/30/2022] Open
Abstract
Genetically encoded Förster Resonance Energy Transfer (FRET)-based biosensors are powerful tools to illuminate spatiotemporal regulation of cell signaling in living cells, but the utility of the red spectrum for biosensing was limited due to a lack of bright and stable red fluorescent proteins. Here, we rationally improve the photophysical characteristics of the coral-derived fluorescent protein TagRFP-T. We show that a new single-residue mutant, super-TagRFP (stagRFP) has nearly twice the molecular brightness of TagRFP-T and negligible photoactivation. stagRFP facilitates significant improvements on multiple green-red biosensors as a FRET acceptor and is an efficient FRET donor that supports red/far-red FRET biosensing. Capitalizing on the ability of stagRFP to couple with multiple FRET partners, we develop a novel multiplex method to examine the confluence of signaling activities from three kinases simultaneously in single living cells, providing evidence for a role of Src family kinases in regulating growth factor induced Akt and ERK activities.
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Affiliation(s)
- Gary C H Mo
- Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA
- Department of Pharmacology, University of Illinois at Chicago, Chicago, IL, 60612, USA
| | - Clara Posner
- Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA
- Department of Bioengineering, University of California San Diego, La Jolla, CA, 92093, USA
| | - Erik A Rodriguez
- Department of Chemistry, The George Washington University, Washington, DC, 20052, USA
| | - Tengqian Sun
- Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA
| | - Jin Zhang
- Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA.
- Department of Bioengineering, University of California San Diego, La Jolla, CA, 92093, USA.
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92093, USA.
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Dynamic multi-site phosphorylation by Fyn and Abl drives the interaction between CRKL and the novel scaffolding receptors DCBLD1 and DCBLD2. Biochem J 2017; 474:3963-3984. [PMID: 29025973 PMCID: PMC6029619 DOI: 10.1042/bcj20170615] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 10/04/2017] [Accepted: 10/09/2017] [Indexed: 12/17/2022]
Abstract
Discoidin, CUB, and LCCL Domain-containing (DCBLD) 2 is a neuropilin-like transmembrane scaffolding receptor with known and anticipated roles in vascular remodeling and neuronal positioning. DCBLD2 is also upregulated in several cancers and can drive glioblastomas downstream of activated Epidermal Growth Factor Receptor. While a few studies have shown either a positive or negative role for DCBLD2 in regulating growth factor receptor signaling, little is known about the conserved signaling features of DCBLD family members that drive their molecular activities. We previously identified DCBLD2 tyrosine phosphorylation sites in intracellular YxxP motifs that are required for the phosphorylation-dependent binding of the signaling adaptors CRK and CRKL (CT10 regulator of kinase and CRK-Like). These intracellular YxxP motifs are highly conserved across vertebrates and between DCBLD family members. Here, we demonstrate that, as for DCBLD2, DCBLD1 YxxP motifs are required for CRKL-SH2 binding. We report Src family kinases (SFKs) and Abl differentially promote the interaction between the CRKL-SH2 domain and DCBLD1 and DCBLD2, and while SFKs and Abl each promotes DCBLD1 and DCBLD2 binding to the CRKL-SH2 domain, the effect of Abl is more pronounced for DCBLD1. Using high performance liquid chromatography coupled with tandem mass spectrometry, we quantified phosphorylation at several YxxP sites in DCBLD1 and DCBLD2, mapping site-specific preferences for SFKs and Abl. Together these data provide a platform to decipher the signaling mechanisms by which these novel receptors drive their biological activities.
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7
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López-Contreras L, Hernández-Ramírez VI, Herrera-Martínez M, Montaño S, Constantino-Jonapa LA, Chávez-Munguía B, Talamás-Rohana P. Structural and functional characterization of the divergent Entamoeba Src using Src inhibitor-1. Parasit Vectors 2017; 10:500. [PMID: 29047404 PMCID: PMC5648430 DOI: 10.1186/s13071-017-2461-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 10/09/2017] [Indexed: 12/14/2022] Open
Abstract
Background The abundant number of kinases that Entamoeba histolytica possesses allows us to assume that the regulation of cellular functions by phosphorylation-dephosphorylation processes is very important. However, the kinases responsible for the phosphorylation in Entamoeba spp. vary in the structure of their domains and, therefore, could be responsible for the unusual biological characteristics of this parasite. In higher eukaryotes, Src kinases share conserved structural domains and are very important in the regulation of the actin cytoskeleton. In both Entamoeba histolytica and Entamoeba invadens, the major Src kinase homologue of higher eukaryotes lacks SH3 and SH2 domains, but does have KELCH domains; the latter are part of actin cross-linking proteins in higher eukaryotic cells. Methods The function of the EhSrc protein kinase of Entamoeba spp. was evaluated using Src inhibitor-1, microscopy assays, Src kinase activity and western blot. In addition, to define the potential inhibitory mechanism of Src-inhibitor-1 for the amoebic EhSrc protein kinase, molecular dynamic simulations using NAnoscale Molecular Dynamics (NAMD2) program and docking studies were performed with MOE software. Results We demonstrate that Src inhibitor-1 is able to prevent the activity of EhSrc protein kinase, most likely by binding to the catalytic domain, which affects cell morphology via the disruption of actin cytoskeleton remodeling and the formation of phagocytic structures without an effect on cell adhesion. Furthermore, in E. invadens, Src inhibitor-1 inhibited the encystment process by blocking RhoA GTPase activity, a small GTPase protein of Rho family. Conclusions Even though the EhSrc molecule of Entamoeba is not a typical Src, because its divergent amino acid sequence, it is a critical factor in the biology of this parasite via the regulation of actin cytoskeleton remodeling via RhoA GTPase activation. Based on this, we conclude that EhSrc could become a target molecule for the future design of drugs that can prevent the transmission of the disease. Electronic supplementary material The online version of this article (10.1186/s13071-017-2461-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Luilli López-Contreras
- Área Académica de Medicina, Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Camino a Tilcuatla s/n Municipio de San Agustín Tlaxiaca. C.P, 42160, Pachuca de Soto, Hidalgo, Mexico
| | - Verónica Ivonne Hernández-Ramírez
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del I.P.N, Avenida Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, Delegación Gustavo A. Madero, 07360, CDMX, CP, Mexico
| | - Mayra Herrera-Martínez
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del I.P.N, Avenida Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, Delegación Gustavo A. Madero, 07360, CDMX, CP, Mexico
| | - Sarita Montaño
- Facultad de Ciencias Químico Biológicas de la Universidad Autónoma de Sinaloa, Calz. de las Américas Norte 2771, Burócrata, 80030, Culiacán de Rosales, Sinaloa, Mexico
| | - Luis Alejandro Constantino-Jonapa
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del I.P.N, Avenida Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, Delegación Gustavo A. Madero, 07360, CDMX, CP, Mexico
| | - Bibiana Chávez-Munguía
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del I.P.N, Avenida Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, Delegación Gustavo A. Madero, 07360, CDMX, CP, Mexico
| | - Patricia Talamás-Rohana
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del I.P.N, Avenida Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, Delegación Gustavo A. Madero, 07360, CDMX, CP, Mexico.
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Garcia-Recio S, Pastor-Arroyo EM, Marín-Aguilera M, Almendro V, Gascón P. The Transmodulation of HER2 and EGFR by Substance P in Breast Cancer Cells Requires c-Src and Metalloproteinase Activation. PLoS One 2015; 10:e0129661. [PMID: 26114632 PMCID: PMC4482606 DOI: 10.1371/journal.pone.0129661] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 05/12/2015] [Indexed: 11/21/2022] Open
Abstract
Background Substance P (SP) is a pleiotropic cytokine/neuropeptide that enhances breast cancer (BC) aggressiveness by transactivating tyrosine kinase receptors like EGFR and HER2. We previously showed that SP and its cognate receptor NK-1 (SP/NK1-R) signaling modulates the basal phosphorylation of HER2 and EGFR in BC, increasing aggressiveness and drug resistance. In order to elucidate the mechanisms responsible for NK-1R-mediated HER2 and EGFR transactivation, we investigated the involvement of c-Src (a ligand-independent mediator) and of metalloproteinases (ligand-dependent mediators) in HER2/EGFR activation. Results and Discussion Overexpression of NK-1R in MDA-MB-231 and its chemical inhibition in SK-BR-3, BT-474 and MDA-MB-468 BC cells significantly modulated c-Src activation, suggesting that this protein is a mediator of NK-1R signaling. In addition, the c-Src inhibitor 4-(4’-phenoxyanilino)-6,7-dimethoxyquinazoline prevented SP-induced activation of HER2. On the other hand, SP-dependent phosphorylation of HER2 and EGFR decreased substantially in the presence of the MMP inhibitor 1–10, phenanthroline monohydrate, and the dual inhibition of both c-Src and MMP almost abolished the activation of HER2 and EGFR. Moreover, the use of these inhibitors demonstrated that this Src and MMP-dependent signaling is important to the cell viability and migration capacity of HER2+ and EGFR+ cell lines. Conclusion Our results indicate that the transactivation of HER2 and EGFR by the pro-inflammatory cytokine/neuropeptide SP in BC cells is a c-Src and MMP-dependent process.
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Affiliation(s)
- Susana Garcia-Recio
- Department of Medical Oncology, Hospital Clínic, Barcelona, Spain
- Institut d’Investigacions Biomediques August Pi i Sunyer, Barcelona, Spain
- * E-mail: (SGR); (PG)
| | - Eva M. Pastor-Arroyo
- Department of Medical Oncology, Hospital Clínic, Barcelona, Spain
- Institut d’Investigacions Biomediques August Pi i Sunyer, Barcelona, Spain
| | - Mercedes Marín-Aguilera
- Department of Medical Oncology, Hospital Clínic, Barcelona, Spain
- Institut d’Investigacions Biomediques August Pi i Sunyer, Barcelona, Spain
| | - Vanessa Almendro
- Department of Medical Oncology, Hospital Clínic, Barcelona, Spain
- Institut d’Investigacions Biomediques August Pi i Sunyer, Barcelona, Spain
| | - Pedro Gascón
- Department of Medical Oncology, Hospital Clínic, Barcelona, Spain
- Institut d’Investigacions Biomediques August Pi i Sunyer, Barcelona, Spain
- Department of Medicine, University of Barcelona, Barcelona, Spain
- * E-mail: (SGR); (PG)
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9
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Vistein R, Puthenveedu MA. Src regulates sequence-dependent beta-2 adrenergic receptor recycling via cortactin phosphorylation. Traffic 2014; 15:1195-205. [PMID: 25077552 DOI: 10.1111/tra.12202] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 07/25/2014] [Accepted: 07/25/2014] [Indexed: 02/03/2023]
Abstract
The recycling of internalized signaling receptors, which has direct functional consequences, is subject to multiple sequence and biochemical requirements. Why signaling receptors recycle via a specialized pathway, unlike many other proteins that recycle by bulk, is a fundamental unanswered question. Here, we show that these specialized pathways allow selective control of signaling receptor recycling by heterologous signaling. Using assays to visualize receptor recycling in living cells, we show that the recycling of the beta-2 adrenergic receptor (B2AR), a prototypic signaling receptor, is regulated by Src family kinases. The target of Src is cortactin, an essential factor for B2AR sorting into specialized recycling microdomains on the endosome. Phosphorylation of a single cortactin residue, Y466, regulates the rate of fission of B2AR recycling vesicles from these microdomains and, therefore, the rate of delivery of B2AR to the cell surface. Together, our results indicate that actin-stabilized microdomains that mediate signaling receptor recycling can serve as a functional point of convergence for crosstalk between signaling pathways.
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Affiliation(s)
- Rachel Vistein
- Department of Biological Sciences, The Center for the Neural Basis of Cognition, Carnegie Mellon University, MI202, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA
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Srinivasan P, Yasgar A, Luci DK, Beatty WL, Hu X, Andersen J, Narum DL, Moch JK, Sun H, Haynes JD, Maloney DJ, Jadhav A, Simeonov A, Miller LH. Disrupting malaria parasite AMA1-RON2 interaction with a small molecule prevents erythrocyte invasion. Nat Commun 2014; 4:2261. [PMID: 23907321 PMCID: PMC3755449 DOI: 10.1038/ncomms3261] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 07/05/2013] [Indexed: 02/03/2023] Open
Abstract
Plasmodium falciparum resistance to artemisinin derivatives, the first-line antimalarial drug, drives the search for new classes of chemotherapeutic agents. Current discovery is primarily directed against the intracellular forms of the parasite. However, late schizont-infected red blood cells (RBCs) may still rupture and cause disease by sequestration; consequently targeting invasion may reduce disease severity. Merozoite invasion of RBCs requires interaction between two parasite proteins AMA1 and RON2. Here we identify the first inhibitor of this interaction that also blocks merozoite invasion in genetically distinct parasites by screening a library of over 21,000 compounds. We demonstrate that this inhibition is mediated by the small molecule binding to AMA1 and blocking the formation of AMA1-RON complex. Electron microscopy confirms that the inhibitor prevents junction formation, a critical step in invasion that results from AMA1-RON2 binding. This study uncovers a strategy that will allow for highly effective combination therapies alongside existing antimalarial drugs.
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Affiliation(s)
- Prakash Srinivasan
- Laboratory of Malaria and Vector Research, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20852, USA.
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Chubinskiy-Nadezhdin VI, Efremova TN, Khaitlina SY, Morachevskaya EA. Functional impact of cholesterol sequestration on actin cytoskeleton in normal and transformed fibroblasts. Cell Biol Int 2013; 37:617-23. [PMID: 23447521 DOI: 10.1002/cbin.10079] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Accepted: 02/11/2013] [Indexed: 11/07/2022]
Abstract
Membrane cholesterol and lipid rafts are implicated in various signalling processes involving actin rearrangement in living cells. However, functional link between raft integrity and organisation of cytoskeleton remains unclear. We have compared the effect of cholesterol sequestration on F-actin structures in normal and transformed fibroblasts in which microfilament system is developed to a different extent. The depletion of membrane cholesterol by methyl-beta-cyclodextrin (MbCD) resulted in a disruption of lipid rafts in plasma membrane as it was revealed by fluorescent labelling of GM1 ganglioside. In normal fibroblasts with highly developed microfilament system, the cholesterol depletion resulted in actin disassembly and reduction of stress fibres. However, in transformed cells containing low amount of fibrillar actin, MbCD treatment induced intensive formation of stress fibres and increased cell spreading. The results show that the effect of cholesterol depletion and lipid raft disruption on microfilament system is critically determined by the initial state of cytoskeleton, specifically, by the balance of polymerised and monomeric actin in the cell. We assume that uncapping of the microfilaments is the key step of cholesterol-regulated actin remodelling.
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12
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Gorrell RJ, Guan J, Xin Y, Tafreshi MA, Hutton ML, McGuckin MA, Ferrero RL, Kwok T. A novel NOD1- and CagA-independent pathway of interleukin-8 induction mediated by the Helicobacter pylori type IV secretion system. Cell Microbiol 2012; 15:554-70. [PMID: 23107019 DOI: 10.1111/cmi.12055] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 08/24/2012] [Accepted: 10/09/2012] [Indexed: 12/12/2022]
Abstract
The type IV secretion system (T4SS) of Helicobacter pylori triggers massive inflammatory responses during gastric infection by mechanisms that are poorly understood. Here we provide evidence for a novel pathway by which the T4SS structural component, CagL, induces secretion of interleukin-8 (IL-8) independently of CagA translocation and peptidoglycan-sensing nucleotide-binding oligomerization domain 1 (NOD1) signalling. Recombinant CagL was sufficient to trigger IL-8 secretion, requiring activation of α5 β1 integrin and the arginine-glycine-aspartate (RGD) motif in CagL. Mutation of the encoded RGD motif to arginine-glycine-alanine (RGA) in the cagL gene of H. pylori abrogated its ability to induce IL-8. Comparison of IL-8 induction between H. pylori ΔvirD4 strains bearing wild-type or mutant cagL indicates that CagL-dependent IL-8 induction can occur independently of CagA translocation. In line with this notion, exogenous CagL complemented H. pylori ΔcagL mutant in activating NF-κB and inducing IL-8 without restoring CagA translocation. The CagA translocation-independent, CagL-dependent IL-8 induction involved host signalling via integrin α5 β1 , Src kinase, the mitogen-activated protein kinase (MAPK) pathway and NF-κB but was independent of NOD1. Our findings reveal a novel pathway whereby CagL, via interaction with host integrins, can trigger pro-inflammatory responses independently of CagA translocation or NOD1 signalling.
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Affiliation(s)
- Rebecca J Gorrell
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Vic., Australia; Department of Microbiology, Monash University, Clayton, Vic., Australia
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Uitdehaag JCM, Verkaar F, Alwan H, de Man J, Buijsman RC, Zaman GJR. A guide to picking the most selective kinase inhibitor tool compounds for pharmacological validation of drug targets. Br J Pharmacol 2012; 166:858-76. [PMID: 22250956 DOI: 10.1111/j.1476-5381.2012.01859.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
To establish the druggability of a target, genetic validation needs to be supplemented with pharmacological validation. Pharmacological studies, especially in the kinase field, are hampered by the fact that many reference inhibitors are not fully selective for one target. Fortunately, the initial trickle of selective inhibitors released in the public domain has steadily swelled into a stream. However, rationally picking the most selective tool compound out of the increasing amounts of available inhibitors has become progressively difficult due to the lack of accurate quantitative descriptors of drug selectivity. A recently published approach, termed 'selectivity entropy', is an improved way of expressing selectivity as a single-value parameter and enables rank ordering of inhibitors. We provide a guide to select the best tool compounds for pharmacological validation experiments of candidate drug targets using selectivity entropy. In addition, we recommend which inhibitors to use for studying the biology of the 20 most investigated kinases that are clinically relevant: Abl (ABL1), AKT1, ALK, Aurora A/B, CDKs, MET, CSF1R (FMS), EGFR, FLT3, ERBB2 (HER2), IKBKB (IKK2), JAK2/3, JNK1/2/3 (MAPK8/9/10), MEK1/2, PLK1, PI3Ks, p38α (MAPK14), BRAF, SRC and VEGFR2 (KDR).
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14
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Seiler C, Davuluri G, Abrams J, Byfield FJ, Janmey PA, Pack M. Smooth muscle tension induces invasive remodeling of the zebrafish intestine. PLoS Biol 2012; 10:e1001386. [PMID: 22973180 PMCID: PMC3433428 DOI: 10.1371/journal.pbio.1001386] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 07/26/2012] [Indexed: 12/12/2022] Open
Abstract
The signals that initiate cell invasion are not well understood, but there is increasing evidence that extracellular physical signals play an important role. Here we show that epithelial cell invasion in the intestine of zebrafish meltdown (mlt) mutants arises in response to unregulated contractile tone in the surrounding smooth muscle cell layer. Physical signaling in mlt drives formation of membrane protrusions within the epithelium that resemble invadopodia, matrix-degrading protrusions present in invasive cancer cells. Knockdown of Tks5, a Src substrate that is required for invadopodia formation in mammalian cells blocked formation of the protrusions and rescued invasion in mlt. Activation of Src-signaling induced invadopodia-like protrusions in wild type epithelial cells, however the cells did not migrate into the tissue stroma, thus indicating that the protrusions were required but not sufficient for invasion in this in vivo model. Transcriptional profiling experiments showed that genes responsive to reactive oxygen species (ROS) were upregulated in mlt larvae. ROS generators induced invadopodia-like protrusions and invasion in heterozygous mlt larvae but had no effect in wild type larvae. Co-activation of oncogenic Ras and Wnt signaling enhanced the responsiveness of mlt heterozygotes to the ROS generators. These findings present the first direct evidence that invadopodia play a role in tissue cell invasion in vivo. In addition, they identify an inducible physical signaling pathway sensitive to redox and oncogenic signaling that can drive this process.
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Affiliation(s)
- Christoph Seiler
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Gangarao Davuluri
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Joshua Abrams
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Fitzroy J. Byfield
- Department of Physiology, Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Paul A. Janmey
- Department of Physiology, Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Michael Pack
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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Abraham J, Chua YX, Glover JM, Tyner JW, Loriaux MM, Kilcoyne A, Giles FJ, Nelon LD, Carew JS, Ouyang Y, Michalek JE, Pal R, Druker BJ, Rubin BP, Keller C. An adaptive Src-PDGFRA-Raf axis in rhabdomyosarcoma. Biochem Biophys Res Commun 2012; 426:363-8. [PMID: 22960170 DOI: 10.1016/j.bbrc.2012.08.092] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 08/22/2012] [Indexed: 11/18/2022]
Abstract
Alveolar rhabdomyosarcoma (aRMS) is a very aggressive sarcoma of children and young adults. Our previous studies have shown that small molecule inhibition of Pdgfra is initially very effective in an aRMS mouse model. However, slowly evolving, acquired resistance to a narrow-spectrum kinase inhibitor (imatinib) was common. We identified Src family kinases (SFKs) to be potentiators of Pdgfra in murine aRMS primary cell cultures from mouse tumors with evolved resistance in vivo in comparison to untreated cultures. Treating the resistant primary cell cultures with a combination of Pdgfra and Src inhibitors had a strong additive effect on cell viability. In Pdgfra knockout tumors, however, the Src inhibitor had no effect on tumor cell viability. Sorafenib, whose targets include not only PDGFRA but also the Src downstream target Raf, was effective at inhibiting mouse and human tumor cell growth and halted progression of mouse aRMS tumors in vivo. These results suggest that an adaptive Src-Pdgfra-Raf-Mapk axis is relevant to PDGFRA inhibition in rhabdomyosarcoma.
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Affiliation(s)
- Jinu Abraham
- Pediatric Cancer Biology Program, Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA.
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16
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Wang CL, Wei LY, Yuan CJ, Hwang KC. Reusable amperometric biosensor for measuring protein tyrosine kinase activity. Anal Chem 2011; 84:971-7. [PMID: 22208917 DOI: 10.1021/ac202369d] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work presents a simple, low-cost and reusable label-free method for detecting protein tyrosine kinase activity using a tyrosinase-based amperometric biosensor (tyrosine kinase biosensor). This method is based on the observation that phosphorylation can block the tyrosinase-catalyzed oxidation of tyrosine or tyrosyl residue in peptides. Therefore, the activity of p60c-src protein tyrosine kinase (Src) on the developed tyrosine kinase biosensor could be quickly determined when its specific peptide substrate, p60c-src substrate I, was used. The tyrosine kinase biosensor was highly sensitive to the activity of Src with a linear dynamic range of 1.9-237.6 U/mL and the lowest detection limit of 0.23 U/mL. Interestingly, the tyrosine kinase activity can be measured using the developed tyrosine kinase biosensor repetitively without regeneration. The inhibitory effect of various kinase inhibitors on the Src activity could be determined on the tyrosine kinase biosensor. Src-specific inhibitors, PP2 and Src inhibitor I, effectively suppressed Src activity, whereas PD153035, an inhibitor of the epidermal growth factor receptor, was ineffective. Staurosporine, a universal kinase inhibitor, inhibited Src activity in an ATP concentration-dependent manner. These results suggests that the activities of tyrosine kinases and their behaviors toward various reagents can be effectively measured using the developed tyrosine kinase biosensor.
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Affiliation(s)
- Chung-Liang Wang
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan, ROC
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17
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Martić S, Labib M, Kraatz HB. Electrochemical investigations of sarcoma-related protein kinase inhibition. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.05.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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5-HT2A receptor signalling through phospholipase D1 associated with its C-terminal tail. Biochem J 2011; 436:651-60. [PMID: 21410433 DOI: 10.1042/bj20101844] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The 5-HT2AR (5-hydroxytryptamine-2A receptor) is a GPCR (G-protein-coupled receptor) that is implicated in the actions of hallucinogens and represents a major target of atypical antipsychotic agents. In addition to its classical signalling though PLC (phospholipase C), the receptor can activate several other pathways, including ARF (ADP-ribosylation factor)-dependent activation of PLD (phospholipase D), which appears to be achieved through a mechanism independent of heterotrimeric G-proteins. In the present study we show that wild-type and inactive constructs of PLD1 (but not PLD2) respectively facilitate and inhibit ARF-dependent PLD signalling by the 5-HT2AR. Furthermore we demonstrate that PLD1 specifically co-immunoprecipitates with the receptor and binds to a distal site in GST (glutathione transferase) fusion protein constructs of its C-terminal tail which is distinct from the ARF-interaction site, thereby suggesting the existence of a functional ARF-PLD signalling complex directly associated with this receptor. This reveals the spatial co-ordination of an important GPCR, transducer and effector into a physical complex that is likely to reinforce the impact of receptor activation on a heterotrimeric G-protein-independent signalling pathway. Signalling of this receptor through such non-canonical pathways may be important to its role in particular disorders.
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King JE, Eugenin EA, Hazleton JE, Morgello S, Berman JW. Mechanisms of HIV-tat-induced phosphorylation of N-methyl-D-aspartate receptor subunit 2A in human primary neurons: implications for neuroAIDS pathogenesis. THE AMERICAN JOURNAL OF PATHOLOGY 2010; 176:2819-30. [PMID: 20448061 DOI: 10.2353/ajpath.2010.090642] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
HIV infection of the central nervous system results in neurological dysfunction in a large number of individuals. NeuroAIDS is characterized by neuronal injury and loss, yet there is no evidence of HIV-infected neurons. Neuronal damage and dropout must therefore be due to indirect effects of HIV infection of other central nervous system cells through elaboration of inflammatory factors and neurotoxic viral proteins, including the viral transactivator, tat. We previously demonstrated that HIV-tat-induced apoptosis in human primary neurons is dependent on N-methyl-D-aspartate receptor (NMDAR) activity. NMDAR activity is regulated by various mechanisms including NMDAR phosphorylation, which may lead to neuronal dysfunction and apoptosis in pathological conditions. We now demonstrate that tat treatment of human neurons results in tyrosine (Y) phosphorylation of the NMDAR subunit 2A (NR2A) in a src kinase-dependent manner. In vitro kinase assays and in vivo data indicated that NR2A Y1184, Y1325, and Y1425 are phosphorylated. Tat treatment of neuronal cultures enhanced phosphorylation of NR2A Y1325, indicating that this site is tat sensitive. Human brain tissue sections from HIV-infected individuals with encephalitis showed an increased phosphorylation of NR2A Y1325 in neurons as compared with uninfected and HIV-infected individuals without encephalitis. These findings suggest new avenues of treatment for HIV-associated cognitive impairment.
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Affiliation(s)
- Jessie E King
- Department of Pathology, The Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
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20
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Leung EL, Wong JC, Johlfs MG, Tsang BK, Fiscus RR. Protein kinase G type Ialpha activity in human ovarian cancer cells significantly contributes to enhanced Src activation and DNA synthesis/cell proliferation. Mol Cancer Res 2010; 8:578-91. [PMID: 20371672 DOI: 10.1158/1541-7786.mcr-09-0178] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Previously, we showed that basal activity of nitric oxide (NO)/cyclic GMP (cGMP)/protein kinase G (PKG) signaling pathway protects against spontaneous apoptosis and confers resistance to cisplatin-induced apoptosis in human ovarian cancer cells. The present study determines whether basal PKG kinase activity regulates Src family kinase (SFK) activity and proliferation in these cells. PKG-Ialpha was identified as predominant isoform in both OV2008 (cisplatin-sensitive, wild-type p53) and A2780cp (cisplatin-resistant, mutated p53) ovarian cancer cells. In both cell lines, ODQ (inhibitor of endogenous NO-induced cGMP biosynthesis), DT-2 (highly specific inhibitor of PKG-Ialpha kinase activity), and PKG-Ialpha knockdown (using small interfering RNA) caused concentration-dependent inhibition of DNA synthesis (assessed by bromodeoxyuridine incorporation), indicating an important role of basal cGMP/PKG-Ialpha kinase activity in promoting cell proliferation. DNA synthesis in OV2008 cells was dependent on SFK activity, determined using highly selective SFK inhibitor, 4-(4'-phenoxyanilino)-6,7-dimethoxyquinazoline (SKI-1). Studies using DT-2 and PKG-Ialpha small interfering RNA revealed that SFK activity was dependent on PKG-Ialpha kinase activity. Furthermore, SFK activity contributed to endogenous tyrosine phosphorylation of PKG-Ialpha in OV2008 and A2780cp cells. In vitro coincubation of recombinant human c-Src and PKG-Ialpha resulted in c-Src-mediated tyrosine phosphorylation of PKG-Ialpha and enhanced c-Src autophosphorylation/activation, suggesting that human c-Src directly tyrosine phosphorylates PKG-Ialpha and the c-Src/PKG-Ialpha interaction enhances Src kinase activity. Epidermal growth factor-induced stimulation of SFK activity in OV2008 cells increased PKG-Ialpha kinase activity (indicated by Ser(239) phosphorylation of the PKG substrate vasodilator-stimulated phosphoprotein), which was blocked by both SKI-1 and SU6656. The data suggest an important role of Src/PKG-Ialpha interaction in promoting DNA synthesis/cell proliferation in human ovarian cancer cells. The NO/cGMP/PKG-Ialpha signaling pathway may provide a novel therapeutic target for disrupting ovarian cancer cell proliferation.
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21
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Li T, Liu D, Wang Z. Screening Kinase Inhibitors with a Microarray-Based Fluorescent and Resonance Light Scattering Assay. Anal Chem 2010; 82:3067-72. [DOI: 10.1021/ac902804h] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tao Li
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China, and Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China
| | - Dianjun Liu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China, and Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China
| | - Zhenxin Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China, and Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China
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22
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Eisinger DA, Ammer H. Down-regulation of c-Cbl by morphine accounts for persistent ERK1/2 signaling in delta-opioid receptor-expressing HEK293 cells. J Biol Chem 2009; 284:34819-28. [PMID: 19828455 DOI: 10.1074/jbc.m109.042937] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Opioids display ligand-specific differences in the time course of ERK1/2 signaling. Whereas full agonists, like etorphine, induce only transient activation of ERK1/2, the partial agonist morphine mediates persistent stimulation of mitogenic signaling. Here we report that in stably delta-opioid receptor (DOR)-expressing HEK293 (HEK/DOR) cells, the transient nature of etorphine-induced ERK1/2 signaling is due to desensitization of epidermal growth factor (EGF) receptor-mediated activation of the Ras/Raf-1/ERK1/2 cascade. Desensitization of ERK1/2 activity by etorphine is associated with down-regulation of EGF receptors, an effect mediated by the ubiquitin ligase c-Cbl. In contrast, chronic morphine treatment failed to desensitize EGF receptors, resulting in unimpeded ERK1/2 signaling. The failure of morphine to desensitize ERK1/2 signaling is mediated by persistent activation of c-Src, which induces degradation of c-Cbl. The role of c-Src in opioid-specific ERK1/2 signaling is further demonstrated by pretreatment of the cells with PP2 and SKI-I as well as overexpression of a dominant negative c-Src mutant (c-Src(dn)) or a c-Src-resistant c-Cbl mutant (CblY3F), both of which facilitate desensitization of ERK1/2 signaling by morphine. Conversely, overexpression of c-Src as well as down-regulation of c-Cbl by small interfering RNA results in persistent etorphine-induced stimulation of ERK1/2 activity. Subcellular fractionation experiments finally attributed the ability of morphine to persistently activate c-Src to its redistribution from Triton X-100-insensitive membrane rafts to DOR and EGF receptor containing high density membrane compartments implicated in ERK1/2 signaling. These results demonstrate that agonist-specific differences in the temporal and spatial pattern of c-Src activation determine the kinetics of DOR-mediated regulation of ERK1/2 signaling.
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Affiliation(s)
- Daniela A Eisinger
- Institute of Pharmacology, Toxicology and Pharmacy, Ludwig-Maximilians-University Munich, 80539 Muenchen, Germany.
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23
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Leung ELH, Tam IYS, Tin VPC, Chua DTT, Sihoe ADL, Cheng LC, Ho JCM, Chung LP, Wong MP. SRC promotes survival and invasion of lung cancers with epidermal growth factor receptor abnormalities and is a potential candidate for molecular-targeted therapy. Mol Cancer Res 2009; 7:923-32. [PMID: 19491201 DOI: 10.1158/1541-7786.mcr-09-0003] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Molecular-targeted therapy using tyrosine kinase inhibitors against epidermal growth factor receptor (EGFR) is an effective therapy for non-small cell lung cancer that harbor EGFR mutations. This study aimed to investigate the role of Src, a close EGFR associator, as a drug target in NSCLC cells with different EGFR genomic statuses. Src inhibition was achieved using 4-(4'-Phenoxyanilino)-6,7-dimethoxyquinazolinee (SKI-1) and the specificity of action was verified by RNA interference. The results showed that SKI-1 induced significant apoptosis in a dose-dependent manner in cancer cells with high basal Src activation. Activation of FAK and p130Cas was involved in Src-mediated invasion in SKI-1-sensitive cells. SKI-1 inhibited phosphorylation of EGFR as well as EGFR downstream effectors, such as signal transducers and activators of transcription 3/5, extracellular signal-regulated kinase 1/2 and AKT in the mutant cells but not the wild-type cells. This inhibition profile of EGFR implicates that induction of apoptosis and sensitivity of mutant cells to SKI treatment is mediated by EGFR and EGFR downstream pathways. Cotreatment with SKI-1 and gefitinib enhanced apoptosis in cancer cells that contained EGFR mutation and/or amplification. SKI-1 treatment alone induced significant apoptosis in H1975 cells known to be resistant to gefitinib. Src phosphorylation was shown by immunohistochemistry in around 30% of primary lung carcinomas. In 152 adenocarcinomas studied, p-Src was associated with EGFR mutations (P = 0.029). Overall, the findings indicated that Src could be a useful target for treatment of non-small cell lung cancer. Besides EGFR genomic mutations, other forms of EGFR and related family member abnormalities such as EGFR amplification might enhance SKI sensitivity.
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Affiliation(s)
- Elaine Lai-Han Leung
- Department of Pathology, University of Hong Kong, Queen Mary Hospital, Hong Kong
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24
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Abram CL, Lowell CA. The diverse functions of Src family kinases in macrophages. FRONT BIOSCI-LANDMRK 2008; 13:4426-50. [PMID: 18508521 DOI: 10.2741/3015] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Macrophages are key components of the innate immune response. These cells possess a diverse repertoire of receptors that allow them to respond to a host of external stimuli including cytokines, chemokines, and pathogen-associated molecules. Signals resulting from these stimuli activate a number of macrophage functional responses such as adhesion, migration, phagocytosis, proliferation, survival, cytokine release and production of reactive oxygen and nitrogen species. The cytoplasmic tyrosine kinase Src and its family members (SFKs) have been implicated in many intracellular signaling pathways in macrophages, initiated by a diverse set of receptors ranging from integrins to Toll-like receptors. However, it has been difficult to implicate any given member of the family in any specific pathway. SFKs appear to have overlapping and complementary functions in many pathways. Perhaps the function of these enzymes is to modulate the overall intracellular signaling network in macrophages, rather than operating as exclusive signaling switches for defined pathways. In general, SFKs may function more like rheostats, influencing the amplitude of many pathways.
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Affiliation(s)
- Clare L Abram
- Department of Laboratory Medicine, University of California, San Francisco, CA 94143, USA
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25
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Skhirtladze C, Distler O, Dees C, Akhmetshina A, Busch N, Venalis P, Zwerina J, Spriewald B, Pileckyte M, Schett G, Distler JHW. Src kinases in systemic sclerosis: Central roles in fibroblast activation and in skin fibrosis. ACTA ACUST UNITED AC 2008; 58:1475-84. [DOI: 10.1002/art.23436] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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26
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RNAi screening of the tyrosine kinome identifies therapeutic targets in acute myeloid leukemia. Blood 2007; 111:2238-45. [PMID: 18025156 DOI: 10.1182/blood-2007-06-097253] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Despite vast improvements in our understanding of cancer genetics, a large percentage of cancer cases present without knowledge of the causative genetic events. Tyrosine kinases are frequently implicated in the pathogenesis of numerous types of cancer, but identification and validation of tyrosine kinase targets in cancer can be a time-consuming process. We report the establishment of an efficient, functional screening assay using RNAi technology to directly assess and compare the effect of individually targeting each member of the tyrosine kinase family. We demonstrate that siRNA screening can identify tyrosine kinase targets containing activating mutations in Janus kinase (JAK) 3 (A572V) in CMK cells and c-KIT (V560G) in HMC1.1 cells. In addition, this assay identifies targets that do not contain mutations, such as JAK1 and the focal adhesion kinases (FAK), that are crucial to the survival of the cancer cells. This technique, with additional development, might eventually offer the potential to match specific therapies with individual patients based on a functional assay.
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27
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Shults MD, Kozlov IA, Nelson N, Kermani BG, Melnyk PC, Shevchenko V, Srinivasan A, Musmacker J, Hachmann JP, Barker DL, Lebl M, Zhao C. A multiplexed protein kinase assay. Chembiochem 2007; 8:933-42. [PMID: 17471478 DOI: 10.1002/cbic.200600522] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We report a novel protein kinase assay designed for high-throughput detection of one or many kinases in a complex mixture. A solution-phase phosphorylation reaction is performed on 900 different peptide substrates, each covalently linked to an oligonucleotide tag. After incubation, phosphoserine, phosphothreonine, and phosphotyrosine are chemically labeled, and the substrates are hybridized to a microarray with oligonucleotides complementary to the tags to read out the phosphorylation state of each peptide. Because protein kinases act on more than one peptide sequence, each kinase can be characterized by a unique signature of phosphorylation activity on multiple substrates. Using this method, we determined signatures for 26 purified kinases and demonstrated that enzyme mixtures can be screened for activity and selectivity of inhibition.
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28
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Zhang F, Zhang Q, Tengholm A, Sjöholm A. Involvement of JAK2 and Src kinase tyrosine phosphorylation in human growth hormone-stimulated increases in cytosolic free Ca2+and insulin secretion. Am J Physiol Cell Physiol 2006; 291:C466-75. [PMID: 16597920 DOI: 10.1152/ajpcell.00418.2005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We previously reported that human growth hormone (hGH) increases cytoplasmic Ca2+concentration ([Ca2+]i) and proliferation in pancreatic β-cells (Sjöholm Å, Zhang Q, Welsh N, Hansson A, Larsson O, Tally M, and Berggren PO. J Biol Chem 275: 21033–21040, 2000) and that the hGH-induced rise in [Ca2+]iinvolves Ca2+-induced Ca2+release facilitated by tyrosine phosphorylation of ryanodine receptors (Zhang Q, Kohler M, Yang SN, Zhang F, Larsson O, and Berggren PO. Mol Endocrinol 18: 1658–1669, 2004). Here we investigated the tyrosine kinases that convey the hGH-induced rise in [Ca2+]iand insulin release in BRIN-BD11 β-cells. hGH caused tyrosine phosphorylation of Janus kinase (JAK)2 and c-Src, events inhibited by the JAK2 inhibitor AG490 or the Src kinase inhibitor PP2. Although hGH-stimulated rises in [Ca2+]iand insulin secretion were completely abolished by AG490 and JAK2 inhibitor II, the inhibitors had no effect on insulin secretion stimulated by a high K+concentration. Similarly, Src kinase inhibitor-1 and PP2, but not its inactive analog PP3, suppressed [Ca2+]ielevation and completely abolished insulin secretion stimulated by hGH but did not affect responses to K+. Ovine prolactin increased [Ca2+]iand insulin secretion to a similar extent as hGH, effects prevented by the JAK2 and Src kinase inhibitors. In contrast, bovine GH evoked a rise in [Ca2+]ibut did not stimulate insulin secretion. Neither JAK2 nor Src kinase inhibitors influenced the effect of bovine GH on [Ca2+]i. Our study indicates that hGH stimulates rise in [Ca2+]iand insulin secretion mainly through activation of the prolactin receptor and JAK2 and Src kinases in rat insulin-secreting cells.
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Affiliation(s)
- Fan Zhang
- Research Center, Karolinska Institute, Stockholm South Hospital, SE-11883 Stockholm, Sweden
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Affiliation(s)
- Victor A Levin
- Department of Neuro-Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, USA
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Belsches-Jablonski AP, Demory ML, Parsons JT, Parsons SJ. The Src pathway as a therapeutic strategy. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.ddstr.2005.11.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Meyn MA, Schreiner SJ, Dumitrescu TP, Nau GJ, Smithgall TE. Src Family Kinase Activity Is Required for Murine Embryonic Stem Cell Growth and Differentiation. Mol Pharmacol 2005; 68:1320-30. [PMID: 15985613 DOI: 10.1124/mol.104.010231] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Self-renewal and differentiation of embryonic stem (ES) cells are regulated by cytokines and growth factors through tyrosine kinase-dependent signaling pathways. In murine ES cells, signals for self-renewal are generated by the leukemia inhibitory factor (LIF). LIF and other growth factors are linked to the activation of the Src family of cytoplasmic protein-tyrosine kinases (SFKs), which consists of eight members having shared structural architecture. In this article, we show that murine ES cells express seven SFKs, three of which (Hck, Src, and Fyn) exhibit constitutive activity in self-renewing ES cells. Differentiation of ES cells to embryoid bodies was associated with rapid transcriptional silencing of Hck and Lck and with the loss of the corresponding kinase proteins. The expression of other family members remained relatively constant, although some loss of Fgr and Lyn proteins was observed during differentiation. Like ES cells, embryoid bodies maintained constitutive Src and Fyn kinase activity. Partial inhibition of endogenous SFK activity with the ATP-competitive inhibitors 4-amino-5-(4-chlorophenyl)-7-(t-butyl)pyrazolo[3,4-d]pyrimidine or Src kinase inhibitor-1 induced differentiation of ES cells in the presence of LIF. In contrast, suppression of all SFK activity with higher concentrations of these inhibitors, or with the more potent compound A-419259 (Bioorg Med Chem Lett 12:1683-1686, 2002) blocked differentiation in response to LIF withdrawal. It is surprising that these inhibitor-treated cells remained pluripotent despite the absence of LIF. Our results implicate individual members of the Src kinase family in distinct ES cell renewal and differentiation pathways and show that small-molecule SFK inhibitors can control ES cell fate.
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Affiliation(s)
- Malcolm A Meyn
- Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, E1240 Biomedical Science Tower, Pittsburgh, PA 15261, USA
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Methylenedioxyanilino-quinazolines and -cyanoquinolines as inhibitors of MEK and/or Src. Expert Opin Ther Pat 2005. [DOI: 10.1517/13543776.14.7.1095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Slon-Usakiewicz JJ, Ng W, Foster JE, Dai JR, Deretey E, Toledo-Sherman L, Redden PR, Pasternak A, Reid N. Frontal Affinity Chromatography with MS Detection of EphB2 Tyrosine Kinase Receptor. 1. Comparison with Conventional ELISA. J Med Chem 2004; 47:5094-100. [PMID: 15456253 DOI: 10.1021/jm049733a] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
FAC-MS offers a convenient method for measuring the relative binding strengths of ligands in a mixture and enables a rapid ranking and identification of ligands in the mixture as potential hits against immobilized targets. Using immobilized EphB2 receptor tyrosine kinase as the target and known kinase inhibitors, the results of FAC-MS screening (% shift) have been shown to correlate with the binding constant, K(d), and with IC(50) results from the more traditional ELISA assay. Therefore, since FAC-MS can accommodate a wide variety of target proteins, its applications could play a broad role in drug discovery not only at the hit discovery stage but also during the subsequent more rigorous screening at the hit-to-lead and lead optimization stages.
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Affiliation(s)
- Jacek J Slon-Usakiewicz
- Protana, Inc., Lead Discovery and Optimization Division, 251 Attwell Drive, Toronto, Ontario M9W 7H4, Canada
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Cruz-Aguado JA, Chen Y, Zhang Z, Brook MA, Brennan JD. Entrapment of Src Protein Tyrosine Kinase in Sugar-Modified Silica. Anal Chem 2004; 76:4182-8. [PMID: 15253661 DOI: 10.1021/ac0497048] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel sugar-modified silica has been used to entrap for the first time a protein tyrosine kinase (PTK). Silane precursors bearing covalently attached gluconamide moieties were used in combination with the biocompatible precursor diglycerylsilane (DGS) to generate sol-gel derived silica that was able to encapsulate highly active Src PTK and preserve the activity of the enzyme over multiple uses. The relative activity of the enzyme was assayed using a LANCE based fluorescence resonance energy transfer method involving time-gated detection of fluorescence from a europium labeled antiphosphotyrosine antibody and Cy5 labeled streptavidin upon mutual binding to biotinylated phosphopeptides. Using this detection method, with the antibody and streptavidin external to the sol-gel matrix, it was possible to detect the phosphorylation of peptides with molecular weights of up to 2300 Da using the entrapped enzyme in N-(3-triethoxysilylpropyl)gluconamide (GLTES) doped glasses. Src kinase-doped glasses, derived from precursors such as tetramethyl orthosilicate, tetraethyl orthosilicate, or DGS that did not contain GLTES, provided no detectable enzyme activity. The addition of 1 mM ATP to the GLTES/DGS sol before the encapsulation of the protein increased the activity of the enzyme in the resulting gel, likely through a ligand-based stabilization mechanism. The use of such a system for determination of PTK activity and inhibition is demonstrated, setting the stage for the development of chromatographic and microarray based methods for the screening of kinase inhibitors.
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Affiliation(s)
- Jorge A Cruz-Aguado
- Department of Chemistry, McMaster University, Hamilton, Ontario L8S 4M1, Canada
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Karni R, Mizrachi S, Reiss-Sklan E, Gazit A, Livnah O, Levitzki A. The pp60c-Src inhibitor PP1 is non-competitive against ATP. FEBS Lett 2003; 537:47-52. [PMID: 12606029 DOI: 10.1016/s0014-5793(03)00069-3] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Glutathione-S-transferase (GST)-pp60(c-Src) (GST-Src) expressed in Escherichia coli is as catalytically active as purified, activated pp60(c-Src) protein derived from human platelets. We utilized the bacterially expressed enzyme, together with information about the structures of Src family kinases in complex with their inhibitors PP1 and PP2, to modify PP1 in a quest for improved inhibitors. Despite the detailed structural information on Hck-PP1 and Lck-PP2 complexes, which shows that PP1 and PP2 bind to the adenosine triphosphate (ATP) pocket, we were unable to improve the affinity between modified PP1 and Src. Puzzled, we examined in detail the mechanism by which PP1 inhibits the kinase activity of Src. Here we report that PP1 is non-competitive with ATP for the inhibition of Src, at variance with what is currently accepted, and is a 'mixed competitive inhibitor' vis-à-vis the substrate. These findings shed new light on the mechanism whereby PP1-like molecules inhibit Src. Examination of the homology between the kinase domain of Src and those of Hck and Lck reveals significant differences outside the ATP binding pocket, whereas they are identical within the ATP binding domain. These results suggest that PP1 may be a leading compound for ATP non-competitive inhibitors of Src family kinases. Since Src in its active form is the hallmark of numerous cancers, understanding how PP1 inhibits activated Src will aid in the discovery of potent and selective Src kinase inhibitors.
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Affiliation(s)
- Rotem Karni
- Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Israel
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