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A role for PKCε during C2C12 myogenic differentiation. Cell Signal 2010; 22:629-35. [DOI: 10.1016/j.cellsig.2009.11.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2009] [Revised: 11/20/2009] [Accepted: 11/21/2009] [Indexed: 02/05/2023]
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2
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Lee J, Jung E, Yu H, Kim Y, Ha J, Kim YS, Park D. Mechanisms of carvacrol-induced expression of type I collagen gene. J Dermatol Sci 2008; 52:160-9. [DOI: 10.1016/j.jdermsci.2008.06.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2008] [Revised: 06/05/2008] [Accepted: 06/11/2008] [Indexed: 01/29/2023]
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3
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Suh PG, Park JI, Manzoli L, Cocco L, Peak JC, Katan M, Fukami K, Kataoka T, Yun SU, Ryu SH. Multiple roles of phosphoinositide-specific phospholipase C isozymes. BMB Rep 2008; 41:415-34. [DOI: 10.5483/bmbrep.2008.41.6.415] [Citation(s) in RCA: 369] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Chen G, Li A, Zhao M, Gao Y, Zhou T, Xu Y, Du Z, Zhang X, Yu X. Proteomic analysis identifies protein targets responsible for depsipeptide sensitivity in tumor cells. J Proteome Res 2008; 7:2733-42. [PMID: 18549279 DOI: 10.1021/pr7008753] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Depsipeptide FR901228 (FK228) is a new kind of histone deacetylase inhibitors (HDACi) that induces growth arrest and cell death in a variety of tumor cells. Though its effects on oncogene expression and degradation have been documented, the detailed mechanism of FK228-induced cytotoxicity is still undefined. In this study, a differential proteomic analysis was performed to identify proteins associated with FK228-induced cytotoxicity in human lung cancer cells. Two-dimensional gel electrophoresis (2-DE) revealed a distinct protein profile of H322 cells in response to FK228 treatment, and 45 protein spots with significant alteration were screened. In total, 27 proteins were identified by mass spectrometry and involved in signal transduction, transcriptional regulation, metabolism, cytoskeletal organization, and protein folding, synthesis and degradation, consistent with multiple effects of FK228 on tumor cells. Notably, a novel target protein, thioredoxin reductase (TrxR), was identified, which is downregulated in FK228-sensitive cancer cells, but upregulated in resistant cells. The expression level of TrxR was negatively correlated with ROS accumulation, DNA damage and apoptosis, implicating TrxR in FK228-induced apoptosis and HDACi sensitivity in cancer cells. Thus, proteomic analysis provides new information about target proteins important for FK228-induced cytotoxicity in cancer cells.
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Affiliation(s)
- Guozhu Chen
- Department of Pathology, Beijing Institute of Basic Medical Sciences, 27 Taiping Road, Beijing 100850, China
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Varela D, Simon F, Olivero P, Armisén R, Leiva-Salcedo E, Jørgensen F, Sala F, Stutzin A. Activation of H 2O 2-Induced VSOR Cl - Currents in HTC Cells Require Phospholipase Cγ1 Phosphorylation and Ca 2+ Mobilisation. Cell Physiol Biochem 2007; 20:773-80. [DOI: 10.1159/000110437] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2007] [Indexed: 11/19/2022] Open
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6
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Heo SK, Yoon MA, Lee SC, Ju SA, Choi JH, Suh PG, Kwon BS, Kim BS. HVEM Signaling in Monocytes Is Mediated by Intracellular Calcium Mobilization. THE JOURNAL OF IMMUNOLOGY 2007; 179:6305-10. [DOI: 10.4049/jimmunol.179.9.6305] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Choi JH, Yang YR, Lee SK, Kim IS, Ha SH, Kim EK, Bae YS, Ryu SH, Suh PG. Phospholipase C-gamma1 potentiates integrin-dependent cell spreading and migration through Pyk2/paxillin activation. Cell Signal 2007; 19:1784-96. [PMID: 17531443 DOI: 10.1016/j.cellsig.2007.04.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2007] [Revised: 03/29/2007] [Accepted: 04/05/2007] [Indexed: 11/25/2022]
Abstract
Phospholipase C-gamma1 (PLC-gamma1), which generates two second messengers, namely, inositol-1, 4, 5-trisphosphate and diacylglycerol, is implicated in growth factor-mediated chemotaxis. However, the exact role of PLC-gamma1 in integrin-mediated cell adhesion and migration remains poorly understood. In this study, we demonstrate that PLC-gamma1 is required for actin cytoskeletal organization and cell motility through the regulation of Pyk2 and paxillin activation. After fibronectin stimulation, PLC-gamma1 directly interacted with the cytoplasmic tail of integrin beta1. In PLC-gamma1-silenced cells, integrin-induced Pyk2 and paxillin phosphorylation were significantly reduced and PLC-gamma1 potentiated the integrin-induced Pyk2/paxillin activation in its enzymatic activity-dependent manner. In addition, specific knock-down of PLC-gamma1 resulted in a failure to form focal adhesions dependent on fibronectin stimulation, which appeared to be caused by the suppression of Pyk2 and paxillin phosphorylation. Interestingly, PLC-gamma1 potentiated the activations of Rac, thus integrin-induced lamellipodia formation was up-regulated. Consequently, the strength of cell-substratum interaction and cell motility were profoundly up-regulated by PLC-gamma1. Taken together, these results suggest that PLC-gamma1 is a key player in integrin-mediated cell spreading and motility achieved by the activation of Pyk2/paxillin/Rac signaling.
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Affiliation(s)
- Jang Hyun Choi
- Department of Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784, Republic of Korea
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Valkova C, Maerz S, Imhof D, Liebmann C. Protein kinase Cepsilon may act as EGF-inducible scaffold protein for phospholipase Cgamma1. Cell Signal 2007; 19:1830-43. [PMID: 17561374 DOI: 10.1016/j.cellsig.2007.04.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2007] [Accepted: 04/07/2007] [Indexed: 11/30/2022]
Abstract
Phospholipase Cgamma1 (PLCgamma1) represents a major downstream signalling component of the epidermal growth factor (EGF) receptor (EGFR) and is activated by tyrosine phosphorylation. Here we show for the first time that cellular knockdown of protein kinase Cepsilon (PKCepsilon) leads to decreased activation of PLCgamma1 by EGF and that EGF induces tyrosine phosphorylation of PKCepsilon as well as association of PKCepsilon with both EGFR and PLCgamma1. Using several mutants, co-immunoprecipitation and phosphopeptide-based pull-down experiments we found that in dependency on c-Src and EGF-stimulation PKCepsilon may bind to the c-Src-specific phosphorylation site pY845-EGFR. Furthermore, we identified a single tyrosine residue, PKCepsilon-Y573, within a consensus binding sequence of the C-terminal SH2 domain of PLCgamma1 which is critical for both tyrosine phosphorylation of PKCepsilon and its association with PLCgamma1. Thus, in particular cells and independent of the kinase activity PKCepsilon may form a signalling module with EGFR and PLCgamma1. Thereby the tyrosine phosphorylation of PLCgamma1 via the EGFR may be facilitated. This is a novel function of PKCepsilon upstream of PLCgamma1 and a novel paradigm for the EGF-induced formation of multi-protein complexes.
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Affiliation(s)
- Christina Valkova
- Institut für Biochemie und Biophysik, Biologisch-Pharmazeutische Fakultät, Friedrich-Schiller-Universität Jena, Philosophenweg 12, D-07743 Jena, Germany
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Choi JH, Ryu SH, Suh PG. On/off-regulation of phospholipase C-gamma 1-mediated signal transduction. ACTA ACUST UNITED AC 2007; 47:104-16. [PMID: 17336371 DOI: 10.1016/j.advenzreg.2006.12.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jang Hyun Choi
- National Research Laboratory of Signaling Network, Department of Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Republic of Korea
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Li D, Wu LJ, Tashiro SI, Onodera S, Ikejima T. Oridonin-Induced A431 Cell Apoptosis Partially Through Blockage of the Ras/Raf/ERK Signal Pathway. J Pharmacol Sci 2007; 103:56-66. [PMID: 17251686 DOI: 10.1254/jphs.fpj06016x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
We have reported that oridonin, a diterpenoid isolated from the plant Rabdosia rubescens, had apoptosis-inducing activities in many cell lines (e.g., human melanoma A375-S2, human cervical cancer HeLa, human breast adenocarcinoma MCF-7, and murine fibrosarcoma L929). In this study, we further investigated signaling events involved in oridonin-induced apoptosis in human epidermoid carcinoma A431 cells. It was found that the total tyrosine kinase activity was inhibited and the protein expressions of epidermal growth factor receptor (EGFR) and phosphorylated EGFR were decreased in oridonin-induced A431 cell apoptosis. Expression of EGFR downstream effector proteins, Grb2, Ras, Raf-1, and extracellular signal-regulated kinase (ERK), was also downregulated by oridonin. Moreover, the oridonin-induced apoptosis was augmented by the Ras inhibitor manumycin A, Raf-1 inhibitor GW5074, or ERK inhibitor PD98059, suggesting that inactivation of Ras, Raf, or ERK participates in oridonin-induced apoptosis. Taken together, oridonin-induced apoptosis in A431 cells might be through blocking EGFR and its downstream Ras/Raf/ERK signal pathway.
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Affiliation(s)
- Dan Li
- China-Japan Research Institute of Medical and Pharmaceutical Sciences, Shenyang Pharmaceutical University, Shenyang 110 016, P.R. China
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Maly K, Hechenberger G, Strese K, Tinhofer I, Wede I, Doppler W, Grunicke HH. Regulation of calcium signalling by the small GTP-binding proteins Ras and Rac1. ACTA ACUST UNITED AC 2006; 47:169-83. [PMID: 17374390 DOI: 10.1016/j.advenzreg.2006.12.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Karl Maly
- Innsbruck Biocenter, Division of Medical Biochemistry, Medical University of Innsbruck, Austria.
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DeBell K, Graham L, Reischl I, Serrano C, Bonvini E, Rellahan B. Intramolecular regulation of phospholipase C-gamma1 by its C-terminal Src homology 2 domain. Mol Cell Biol 2006; 27:854-63. [PMID: 17116690 PMCID: PMC1800685 DOI: 10.1128/mcb.01400-06] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Phosphoinositide-specific phospholipase C-gamma1 (PLC-gamma1) is a key enzyme that governs cellular functions such as gene transcription, secretion, proliferation, motility, and development. Here, we show that PLC-gamma1 is regulated via a novel autoinhibitory mechanism involving its carboxy-terminal Src homology (SH2C) domain. Mutation of the SH2C domain tyrosine binding site led to constitutive PLC-gamma1 activation. The amino-terminal split pleckstrin homology (sPHN) domain was found to regulate the accessibility of the SH2C domain. PLC-gamma1 constructs with mutations in tyrosine 509 and phenylalanine 510 in the sPHN domain no longer required an intact amino-terminal Src homology (SH2N) domain or phosphorylation of tyrosine 775 or 783 for activation. These data are consistent with a model in which the SH2C domain is blocked by an intramolecular interaction(s) that is released upon cellular activation by occupancy of the SH2N domain.
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Affiliation(s)
- Karen DeBell
- Laboratory of Immunobiology, Division of Monoclonal Antibodies, Centrer for Drug Evaluation and Research, Food and Drug Administration/DHHS, 29 Lincoln Drive, Bethesda, MD 20892-4555, USA.
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Heiss E, Masson K, Sundberg C, Pedersen M, Sun J, Bengtsson S, Rönnstrand L. Identification of Y589 and Y599 in the juxtamembrane domain of Flt3 as ligand-induced autophosphorylation sites involved in binding of Src family kinases and the protein tyrosine phosphatase SHP2. Blood 2006; 108:1542-50. [PMID: 16684964 DOI: 10.1182/blood-2005-07-008896] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Early signal relay steps upon ligand binding to the receptor tyrosine kinase Flt3 (ie, sites of Flt3 autophosphorylation and subsequent docking partners) are mainly unresolved. By immunoprecipitation of specific tryptic peptides contained in the juxtamembrane region of human Flt3 and subsequent radiosequencing, we identified the tyrosine residues 572, 589, 591, and 599 as in vivo autophosphorylation sites. Focusing on Y589 and Y599, we examined Flt3 ligand (FL)-mediated responses in wild-type-Flt3-(WT-Flt3-), Y589F-Flt3-, and Y599F-Flt3-expressing 32D cells. Compared with WT-Flt3-32D cells upon ligand stimulation, 32D-Y589F-Flt3 showed enhanced Erk activation and proliferation/survival, whereas 32D-Y599F-Flt3 cells hereby displayed substantially diminished responses. Both pY589 and pY599 were identified as association sites for signal relay molecules including Src family kinases and SHP2. Consistently, 32D-Y589F-Flt3 and 32D-Y599F-Flt3 showed decreased FL-triggered activation of Src family kinases. Interference with the Src-dependent negative regulation of Flt3 signaling may account for the enhanced mitogenic response of Y589F-Flt3. Y599 was additionally found to interact with the protein tyrosine phosphatase SHP2 in a phosphorylation-dependent manner. As Y599F-Flt3-32D was unable to associate with and to phosphorylate SHP2 and since silencing of SHP2 in WT-Flt3-expressing cells mimicked the Y599F-Flt3 phenotype, we hypothesize that recruitment of SHP2 to pY599 contributes to FL-mediated Erk activation and proliferation.
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Affiliation(s)
- Elke Heiss
- Experimental Clinical Chemistry, Department of Laboratory Medicine, Lund University, Malmö University Hospital, Malmö, Sweden
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Sebastian S, Settleman J, Reshkin SJ, Azzariti A, Bellizzi A, Paradiso A. The complexity of targeting EGFR signalling in cancer: from expression to turnover. Biochim Biophys Acta Rev Cancer 2006; 1766:120-39. [PMID: 16889899 DOI: 10.1016/j.bbcan.2006.06.001] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2006] [Revised: 06/08/2006] [Accepted: 06/15/2006] [Indexed: 12/22/2022]
Abstract
The epidermal growth factor receptor (ErbB1 or EGFR) has been found to be altered in a variety of human cancers. A number of agents targeting these receptors, including specific antibodies directed against the ligand-binding domain of the receptor and small molecules that inhibit kinase activity are either in clinical trials or are already approved for clinical treatment. However, identifying patients that are likely to respond to such treatments has been challenging. As a consequence, it still remains important to identify additional alterations of the tumor cell that contribute to the response to EGFR-targeted agents. While EGFR-mediated signalling pathways have been well established, there is still a rather limited understanding of how intracellular protein-protein interactions, ubiquitination, endocytosis and subsequent degradation of EGFR contribute to the determination of sensitivity to EGFR targeting agents and are emerging areas of investigation. This review primarily focuses on the basic signal transduction pathways mediated through activated membrane bound and/or endosomal EGFR and emphasizes the need to co-target additional proteins that function either upstream or downstream of EGFR to improve cancer therapy.
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Affiliation(s)
- Sinto Sebastian
- Clinical Experimental Oncology Laboratory, National Cancer Institute, Via Amendola, 209, 70126, Bari, Italy
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