Timothy D Veenstra

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..Here, we discuss the challenges and opportunities in metabolic phenotyping for discovering novel cancer biomarkers, and we assess the clinical applicability of MS and NMR...

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..In this article, many of these will be described with an emphasis on their advantageous and disadvantageous for the discovery of clinically useful biomarkers...

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..This technology is capable of analyzing hundreds of clinical samples per day and has the potential to be a novel, highly sensitive diagnostic tool for the early detection of diseases, or as a predictor of response to therapy...

..This need is especially true for clinical and epidemiological studies in which limited amounts of samples are available...

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..Testing of this novel CE-MS system showed its ability to characterize proteomic samples such as protein digests, in-gel-digested proteins, and hydrophobic peptides as well as to quantitate ICAT-labeled peptides...

..These results indicate that methanol alone or in combination with PPS yielded significantly higher membrane protein identification/enrichment than the PPS alone...

..These peptides resulted in identification of 2563 proteins of which 876 (34%) are classified as membrane proteins...

..Antibody-based analysis of a panel of human melanoma cell lines confirmed that CD13 and SDF-1 were consistently upregulated during hypoxia. This study provides the basis for the discovery of novel hypoxia-induced membrane proteins...

..In this review, the advantages afforded by recently introduced methods for prefractionation of serum, as they pertain to the detection and identification of biomarkers, will be discussed...

..The results presented here represent the broadest proteome coverage in mouse serum and provide a foundation from which quantitative comparisons can be made in this important animal model...

..This result confirms previous, targeted studies suggesting that DRMMs isolated using Triton X-100 and Brij-96 differ in their protein content...

..Furthermore, 121 proteins from cholesterol-rich plasma membrane domains (caveolar and lipid rafts) were identified...

..The quantitative profiling of Ib-induced DRMP from Vero cells revealed several proteins with altered expression levels suggesting their possible role in Ib binding/uptake...

..The study also indicates that evaluation of confidence levels for phosphopeptide identification via the reversed sequence database searching strategy might underestimate the false positive rate...

..The ability to accurately measure changes in both protein abundance and mRNA levels on a system-wide scale represents a novel means to extract data from previously one-dimensional datasets...

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..These methods can be easily adapted to study ECM and secreted vesicles in other cell types, primary cell cultures derived from animal models, or tissue specimens...

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..This analysis resulted in the identification of 383 unique proteins in the WCX-2 serum retentate. Among the proteins identified, 50 (13%) are documented clinical biomarkers with 36 of these (72%) identified from multiple peptides...

..e., tumor proper, stroma, etc.) can be effectively studied for potential biomarkers, drug targets, pathway analysis, as well as enhanced understanding of the pathological process under study...

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..This investigation represents the first systematic proteomic analysis of MVs and provides insights into both the function and origin of these important mineralization-regulating vesicles...

..The ability to identify the proteins extracted from FFPE tissues allows comparative analyses that enable the potential discovery of novel biomarkers at the site of the diseased tissue...

..This review discusses some of these approaches in their context of meeting the National Cancer Institute's 2015 goal...

..For this reason, the emphasis on developing methods to target and measure the absolute quantity of specific proteins and peptides in complex proteomic samples has grown...

..This review will discuss recently published applications of pSFC, with a specific focus on its advantages and limitations for the analysis of pharmaceuticals with varying chemical properties...

..The results presented here provide the broadest proteome coverage for a mammalian cell to date and show that MS-based proteomics has the potential to provide high coverage of the proteins expressed within a cell...

..These findings identify KSR2 as a Ca2+-regulated ERK scaffold and reveal a new mechanism whereby Ca2+ impacts Ras to ERK pathway signaling...

..41-fold increase as determined by Western blotting. These results demonstrate that quantitative proteomics is capable of providing a quantitative view of thousands of proteins in mammalian cells within a defined set of experiments...

..The new ICAT reagents were then applied to the analysis of a cortical neuron proteome sample to identify proteins regulated by the antitumor drug, camptothecin...

..Thus, CSCs must be engaged by one or more extracellular signals to differentiate and initiate tumor formation, defining a new axis for future novel therapies aimed at both the extrinsic and intracellular pathways...

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..This analysis greatly increases our knowledge of the protein content of this clinically important biofluid...

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..A total of 91 (24%) proteins were classified as integral alpha-helical membrane proteins, of which 51 (56%) were predicted to have multiple transmembrane domains...

..We chose these two populations because of the well documented predisposition of AA women to develop aggressive, highly metastatic breast cancer compared to CAU women...

..These findings elucidate a critical Raf-1 regulatory mechanism that contributes to the sensitive, temporal modulation of Ras signaling...

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..Other related procedures such as the cation exchange high performance liquid chromatography separation of peptides and MS analysis are detailed elsewhere in this book...

..The methodology adopted in this work provides the means for future quantitative measurements in comparative animal models of disease and in human disease cohorts...

..These findings identify CK2 as a novel component of the KSR1 scaffolding complex that facilitates ERK cascade signaling by functioning as a Raf family N-Region kinase...

..Unlike first-dimensional ion-exchange LC fractionation, where there is a large degree of overlap, the CZE-MS results show less than 15% overlap between neighboring RPLC fractions...

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..The method described here provides the first direct stable-isotope labeling method to definitely detect phosphorylation sites within proteins...

..The entire procedure--beginning with isolated membrane fraction and finishing with MS data acquisition--takes 4-5 d...

..The findings and implications in developmental biology, tumor biology, immunology, biomarker discovery, and vaccine research are also discussed...

..Using this bioinformatic approach, we were able to discriminate spectral patterns associated with IC-affected, BC-affected, and unaffected patients with a success rate of approximately 84%...

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..Interestingly, the DNA excision repair pathway is enhanced, while integrin and its ligands are downregulated in the cells with long telomeres. These results may provide valuable information related to telomere functions...

..The results were highly reproducible across replicate samples, showing that typical histological tissue sections represent an important sample type for the measurement of these specific metabolites...

..Thus, to our knowledge, we show for the first time that Ku70 mediates type III IFN induction by DNA...

..In this review, we highlight different strategies used toward biomarker discovery and discuss them in terms of their reliance on technology and methodology...

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..Although these developments are quite new, the ability to conduct MS-based proteomic analyses of FFPE tissues opens heretofore intractable clinical samples for discovery-based biomarker research...

..Our data suggests that Ran is a physiological substrate of Plk1 and that Plk1 regulates the spindle organization partially through its phosphorylation on Ran...

..One of these markers has been identified as apolipoprotein A-II...

..In this review, we discuss and highlight select examples of discovery-driven proteomic studies focused on finding effective biomarkers for TBI...

..We evaluated high performance liquid chromatography coupled online with a mass spectrometer metabolomic approach to differentiate urine samples from healthy individuals and patients with bladder cancer...

..Proteomic pattern technology allows hundreds of clinical samples to be analyzed per day and promises to be a novel, highly sensitive predictive clinical tool to improve diagnostic and prognostic medicine...

..The advantages and limitations of three sheathless designs are discussed and commented upon, these include single-capillary, two-capillary and three-piece designs...

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..Hundreds of clinical samples per day can be analyzed utilizing this technology, which has the potential to be a novel, highly sensitive diagnostic tool for the early detection of cancer...

..Injection of 25 fmol of [Glu1]-fibrinopeptide B using the new device produced a CE-ESI-MS electropherogram with a signal-to-noise ratio of over 100 for this peptide...

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..Strategies for global, targeted, and quantitative phosphoproteomics are discussed, and some recent interesting applications are also evaluated...

..In this minireview we discuss the application of SELDI-TOF MS to protein biomarker discovery and profiling...

..The application of each technique is discussed and its advantages and limitations are discussed with selective illustrative examples...

..This manuscript provides a review of two- and three-dimensional peptide separation strategies combined with MS for the analysis of complex peptide mixtures...

..Our delineation of the role of VCP in regulating cell responses to ubiquitinated proteins has important implications for understanding Cd2+ toxicity and associated diseases...

..Fortunately, rapid progress has increased the ability to characterize this critically important class of proteins on a scale analogous to that of aqueous soluble proteins...

..While acquisition of the 2D data require more time, the data obtained resulted in a more meaningful and comprehensive metabolic profile, aided in metabolite identifications, and minimized ambiguities in peak assignments...

..The quantitation of the nanoparticles was linear from 0-500 microg/mL with detection limits ranging from 0.5 to 6 microg/mL...

..APF also inhibits the proliferation of HeLa cervical carcinoma cells that are known to express CKAP4/p63. These data indicate that CKAP4/p63 is an important epithelial cell receptor for APF...

..MDM-derived HIV contained 26 of 37 proteins previously found in exosomes, consistent with the idea that HIV uses the late endosome/multivesicular body pathway during virion budding from macrophages...

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..While advances in technology have had a huge impact, sample preparation issues related to the isolation of protein complexes remains a critical factor in determining the success of these types of studies...

..Much effort has gone into optimising the biofluid proteome coverage that can be obtained using these technologies, leaving proteomics poised to make an important impact in disease diagnostics in the future...

..These advances have significant implications for understanding the multitude of pathways that govern behavior and cognition and the response of the nervous system to injury and disease...

..Thus, Plk1 self-regulates the Plk1-PBIP1 interaction to timely localize to the kinetochores and promote proper chromosome segregation...

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..The resulting nonredundant list confirms the presence of a number of interesting candidate marker proteins in plasma and serum...

..This mechanism links assembly of a cellular structure to passage into mitosis...

..We present low-level methods for the processing of mass spectral data and a machine learning method that combines support vector machines, with particle swarm optimization for biomarker selection...

..Clinically engineered mass spectroscopy systems are essential for the further development and validation of multiplexed biomarkers that have shown tremendous promise for the early detection of disease...

..APF is therefore a frizzled-related peptide growth inhibitor shown to contain exclusively a transmembrane segment of a frizzled protein and is a potential biomarker for interstitial cystitis...

..This review discusses some of the recent progress made in the development of techniques not only to identify, but also to quantitatively determine sites of phosphorylation...