Read by QxMD icon Read

platelet phosphoproteomics

Fiorella A Solari, Nadine J A Mattheij, Julia M Burkhart, Frauke Swieringa, Peter W Collins, Judith M E M Cosemans, Albert Sickmann, Johan W M Heemskerk, René P Zahedi
The Scott syndrome is a very rare and likely underdiagnosed bleeding disorder associated with mutations in the gene encoding anoctamin-6. Platelets from Scott patients are impaired in various Ca(2+)-dependent responses, including phosphatidylserine exposure, integrin closure, intracellular protein cleavage, and cytoskeleton-dependent morphological changes. Given the central role of anoctamin-6 in the platelet procoagulant response, we used quantitative proteomics to understand the underlying molecular mechanisms and the complex phenotypic changes in Scott platelets compared with control platelets...
October 2016: Molecular & Cellular Proteomics: MCP
Adil R Sarhan, Trushar R Patel, Andrew J Creese, Michael G Tomlinson, Carina Hellberg, John K Heath, Neil A Hotchin, Debbie L Cunningham
Intracellular signaling pathways are reliant on protein phosphorylation events that are controlled by a balance of kinase and phosphatase activity. Although kinases have been extensively studied, the role of phosphatases in controlling specific cell signaling pathways has been less so. Leukocyte common antigen-related protein (LAR) is a member of the LAR subfamily of receptor-like protein tyrosine phosphatases (RPTPs). LAR is known to regulate the activity of a number of receptor tyrosine kinases, including platelet-derived growth factor receptor (PDGFR)...
June 2016: Molecular & Cellular Proteomics: MCP
Naveid A Ali, Jianmin Wu, Falko Hochgräfe, Howard Chan, Radhika Nair, Sunny Ye, Luxi Zhang, Ruth J Lyons, Mark Pinese, Hong Ching Lee, Nicola Armstrong, Christopher J Ormandy, Susan J Clark, Alexander Swarbrick, Roger J Daly
INTRODUCTION: Although aberrant tyrosine kinase signalling characterises particular breast cancer subtypes, a global analysis of tyrosine phosphorylation in mouse models of breast cancer has not been undertaken to date. This may identify conserved oncogenic pathways and potential therapeutic targets. METHODS: We applied an immunoaffinity/mass spectrometry workflow to three mouse models: murine stem cell virus-Neu, expressing truncated Neu, the rat orthologue of human epidermal growth factor receptor 2, Her2 (HER2); mouse mammary tumour virus-polyoma virus middle T antigen (PyMT); and the p53-/- transplant model (p53)...
2014: Breast Cancer Research: BCR
Clarissa Dickhut, Ingo Feldmann, Jörg Lambert, René P Zahedi
In the past few years, the focus of phosphoproteomics has shifted from merely qualitative to quantitative and targeted studies. Tryptic digestion is a critical step that directly affects quantification and that can be impaired by phosphorylation. Therefore, we systematically characterized the digestion efficiency of 19 nonmodified and phosphorylated model peptides. Whereas we quantified a strong reduction of tryptic cleavage within phosphorylated PKA motifs (R)-R-X-pS/pT and also R-X-X-pT sequences, (R)-R-X-pY sequences were almost unaffected...
June 6, 2014: Journal of Proteome Research
Maartje van den Biggelaar, Juan Ramon Hernández-Fernaud, Bart L van den Eshof, Lisa J Neilson, Alexander B Meijer, Koen Mertens, Sara Zanivan
Thrombin is the key serine protease of the coagulation cascade and a potent trigger of protease-activated receptor 1 (PAR1)-mediated platelet aggregation. In recent years, PAR1 has become an appealing target for anticoagulant therapies. However, the inhibitors that have been developed so far increase bleeding risk in patients, likely because they interfere with endogenous PAR1 signaling in the endothelium. Because of its complexity, thrombin-induced signaling in endothelial cells has remained incompletely understood...
March 20, 2014: Blood
Alejandro Zimman, Bjoern Titz, Evangelia Komisopoulou, Sudipta Biswas, Thomas G Graeber, Eugene A Podrez
Specific oxidized phospholipids (oxPCCD36) promote platelet hyper-reactivity and thrombosis in hyperlipidemia via the scavenger receptor CD36, however the signaling pathway(s) induced in platelets by oxPCCD36 are not well defined. We have employed mass spectrometry-based tyrosine, serine, and threonine phosphoproteomics for the unbiased analysis of platelet signaling pathways induced by oxPCCD36 as well as by the strong physiological agonist thrombin. oxPCCD36 and thrombin induced differential phosphorylation of 115 proteins (162 phosphorylation sites) and 181 proteins (334 phosphorylation sites) respectively...
2014: PloS One
Chad D Walls, Anton Iliuk, Yunpeng Bai, Mu Wang, W Andy Tao, Zhong-Yin Zhang
Phosphatase of regenerating liver 3 (PRL3) is suspected to be a causative factor toward cellular metastasis when in excess. To date, the molecular basis for PRL3 function remains an enigma, making efforts at distilling a concerted mechanism for PRL3-mediated metastatic dissemination very difficult. We previously discovered that PRL3 expressing cells exhibit a pronounced increase in protein tyrosine phosphorylation. Here we take an unbiased mass spectrometry-based approach toward identifying the phosphoproteins exhibiting enhanced levels of tyrosine phosphorylation with a goal to define the "PRL3-mediated signaling network...
December 2013: Molecular & Cellular Proteomics: MCP
Jordane Biarc, Robert J Chalkley, A L Burlingame, Ralph A Bradshaw
Receptor tyrosine kinases generally act by forming phosphotyrosine-docking sites on their own endodomains that propagate signals through cascades of post-translational modifications driven by the binding of adaptor/effector proteins. The pathways that are stimulated in any given receptor tyrosine kinase are a function of the initial docking sites that are activated and the availability of downstream participants. In the case of the Trk receptors, which are activated by nerve growth factor, there are only two established phosphotyrosine-docking sites (Tyr-490 and Tyr-785 on TrkA) that are known to be directly involved in signal transduction...
June 7, 2013: Journal of Biological Chemistry
Murat Cirit, Kyle G Grant, Jason M Haugh
Inhibition of the ubiquitin-proteasome protein degradation pathway has been identified as a viable strategy for anti-tumor therapy based on its broad effects on cell proliferation. By the same token, the variety of elicited effects confounds the interpretation of cell-based experiments using proteasome inhibitors such as MG132. It has been proposed that MG132 treatment reduces growth factor-stimulated phosphorylation of extracellular signal-regulated kinases (ERKs), at least in part through upregulation of dual specificity phosphatases (DUSPs)...
2012: PloS One
Michela Di Michele, Chris Van Geet, Kathleen Freson
Platelets are the fundamental players in primary hemostasis, but are also involved in several pathological conditions. The remarkable advances in proteomic methodologies have allowed a better understanding of the basic physiological pathways underlying platelet biology. In addition, recent platelet proteomics focused on disease conditions, helping to elucidate the molecular mechanisms of complex and/or unknown human disorders and to find novel biomarkers for early diagnosis and drug targets. The most common and innovative proteomic techniques, both gel-based and gel-free, used in platelet proteomics will be reviewed here...
August 2012: Expert Review of Proteomics
Yun Bai, Jiannong Li, Bin Fang, Arthur Edwards, Guolin Zhang, Marilyn Bui, Steven Eschrich, Soner Altiok, John Koomen, Eric B Haura
Driver tyrosine kinase mutations are rare in sarcomas, and patterns of tyrosine phosphorylation are poorly understood. To better understand the signaling pathways active in sarcoma, we examined global tyrosine phosphorylation in sarcoma cell lines and human tumor samples. Anti-phosphotyrosine antibodies were used to purify tyrosine phosphorylated peptides, which were then identified by liquid chromatography and tandem mass spectrometry. The findings were validated with RNA interference, rescue, and small-molecule tyrosine kinase inhibitors...
May 15, 2012: Cancer Research
Jordane Biarc, Robert J Chalkley, A L Burlingame, Ralph A Bradshaw
Stably transfected PC12 cells expressing a chimeric receptor composed of the extracellular domain of the platelet-derived growth factor receptor BB and the transmembrane and intracellular domains of TrkA, the nerve growth factor receptor, were stimulated for 20 min with platelet-derived growth factor and the resulting phosphoproteome was determined from affinity purified tryptic peptides identified by tandem MS (MS/MS) analyses. The changes in the levels of individual phosphorylation sites in stimulated cells versus control were ascertained by the stable isotope labeling of amino acids in cell culture technique...
May 2012: Molecular & Cellular Proteomics: MCP
Thomas Premsler, Urs Lewandrowski, Albert Sickmann, René Peiman Zahedi
Blood platelets are key players standing at the crossroads between physiologically occurring hemostasis and pathologic thrombus formation. As these cellular particles lack a nucleus, intra- and intercellular processes involved in platelet activity and function are almost exclusively regulated on the protein level. In particular, posttranslational protein modification by phosphorylation, which allows for a quick and highly dynamic transduction of cellular signals, is discussed in this context. In addition, since platelet activation and aggregation usually require surface contact with the surrounding tissue, special interest focuses on this contacting region, and hence on the subproteome of the platelet plasma membrane...
2011: Methods in Molecular Biology
Lisa Senzel, Dmitri V Gnatenko, Wadie F Bahou
PURPOSE OF REVIEW: The proteome is the pool of proteins expressed at a given time and circumstance. The word 'proteomics' summarizes several technologies for visualization, quantitation and identification of these proteins. Recent advances in these techniques are helping to elucidate platelet processes which are relevant to bleeding and clotting disorders, transfusion medicine and regulation of angiogenesis. RECENT FINDINGS: Over 1100 platelet proteins have been identified using proteomic techniques...
September 2009: Current Opinion in Hematology
René P Zahedi, Urs Lewandrowski, Julia Wiesner, Stefanie Wortelkamp, Jan Moebius, Claudia Schütz, Ulrich Walter, Stepan Gambaryan, Albert Sickmann
Beside their main physiological function in hemostasis, platelets are also highly involved in pathological processes, such as atherothrombosis and inflammation. During hemostasis, binding of adhesive substrates to tyrosine-kinase-linked adhesion receptors and/or soluble agonists to G-protein coupled receptors leads to a cascade of intracellular signaling processes based on substrate (de)phosphorylation. The same mechanisms are involved in platelet activation at sites of atherosclerotic plaque rupture, contributing to vessel occlusion and consequently to pathologic states, such as myocardial infarction, stroke, or peripheral artery disease...
February 2008: Journal of Proteome Research
Klarisa Rikova, Ailan Guo, Qingfu Zeng, Anthony Possemato, Jian Yu, Herbert Haack, Julie Nardone, Kimberly Lee, Cynthia Reeves, Yu Li, Yerong Hu, Zhiping Tan, Matthew Stokes, Laura Sullivan, Jeffrey Mitchell, Randy Wetzel, Joan Macneill, Jian Min Ren, Jin Yuan, Corey E Bakalarski, Judit Villen, Jon M Kornhauser, Bradley Smith, Daiqiang Li, Xinmin Zhou, Steven P Gygi, Ting-Lei Gu, Roberto D Polakiewicz, John Rush, Michael J Comb
Despite the success of tyrosine kinase-based cancer therapeutics, for most solid tumors the tyrosine kinases that drive disease remain unknown, limiting our ability to identify drug targets and predict response. Here we present the first large-scale survey of tyrosine kinase activity in lung cancer. Using a phosphoproteomic approach, we characterize tyrosine kinase signaling across 41 non-small cell lung cancer (NSCLC) cell lines and over 150 NSCLC tumors. Profiles of phosphotyrosine signaling are generated and analyzed to identify known oncogenic kinases such as EGFR and c-Met as well as novel ALK and ROS fusion proteins...
December 14, 2007: Cell
René P Zahedi, Antonija J Begonja, Stepan Gambaryan, Albert Sickmann
Besides their role in hemostasis, platelets are also highly involved in the pathogenesis and progression of cardiovascular diseases. Since important and initial steps of platelet activation and aggregation are regulated by phosphorylation events, a comprehensive study aimed at the characterization of phosphorylation-driven signaling cascades might lead to the identification of new target proteins for clinical research. However, it becomes increasingly evident that only a comprehensive phosphoproteomic approach may help to characterize functional protein networks and their dynamic alteration during physiological and pathophysiological processes in platelets...
December 2006: Biochimica et Biophysica Acta
Kevin Dierck, Kazuya Machida, Anja Voigt, Julian Thimm, Martin Horstmann, Walter Fiedler, Bruce J Mayer, Peter Nollau
Deciphering global signaling networks is of great importance for the detailed understanding of cellular signaling processes controlling many important biological functions. Among signaling processes, tyrosine phosphorylation has a central role. At present, adequate techniques for the global characterization of the tyrosine phosphoproteome are lacking, particularly for the analysis of small amounts of protein. By combining the power of PCR amplification with the unique properties of Src homology region 2 (SH2) domains to specifically recognize tyrosine-phosphorylated proteins, we developed a new proteomic approach, termed oligonucleotide-tagged multiplex assay (OTM)...
September 2006: Nature Methods
Valerie L Goss, Kimberly A Lee, Albrecht Moritz, Julie Nardone, Erik J Spek, Joan MacNeill, John Rush, Michael J Comb, Roberto D Polakiewicz
The Bcr-Abl fusion kinase drives oncogenesis in chronic myeloid leukemia (CML). CML patients are currently treated with the Abl tyrosine kinase inhibitor imatinib, which is effective in early stages of the disease. However, resistance to imatinib arises in later disease stages primarily because of a Bcr-Abl mutation. To gain deeper insight into Bcr-Abl signaling pathways, we generated phosphotyrosine profiles for 6 cell lines that represent 3 Bcr-Abl fusion types by using immunoaffinity purification of tyrosine phosphopeptides followed by tandem mass spectrometry...
June 15, 2006: Blood
Yoon-Pin Lim, Lang-Shi Diong, Robert Qi, Brian J Druker, Richard J Epstein
Many proteins regulating cancer cell growth are tyrosine phosphorylated. Using antiphosphotyrosine affinity chromatography, thiourea protein solubilization, two-dimensional PAGE, and mass spectrometry, we report here the characterization of the epidermal growth factor (EGF)-induced phosphoproteome in A431 human epidermoid carcinoma cells. Using this approach, more than 50 distinct tyrosine phosphoproteins are identifiable within five main clusters-cytoskeletal proteins, signaling enzymes, SH2-containing adaptors, chaperones, and focal adhesion proteins...
December 2003: Molecular Cancer Therapeutics
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"