5 research outputs found
Quantitative Serum Glycomics of Esophageal Adenocarcinoma, and Other Esophageal Disease Onsets
Aberrant glycosylation has been implicated in various types of cancers and changes in glycosylation may be associated with signaling pathways during malignant transformation. Glycomic profiling of blood serum, in which cancer cell proteins or their fragments with altered glycosylation patterns are shed, could reveal the altered glycosylation. We performed glycomic profiling of serum from patients with no known disease (N=18), patients with high grade dysplasia (HGD, N=11) and Barrettās (N=5), and patients with esophageal adenocarcinoma (EAC, N=50) in an attempt to delineate distinct differences in glycosylation between these groups. The relative intensities of 98 features were significantly different among the disease onsets; 26 of these correspond to known glycan structures. The changes in the relative intensities of three of the known glycan structures predicted esophageal adenocarcinoma with 94% sensitivity and better than 60% specificity as determined by receiver operating characteristic (ROC) analysis. We have demonstrated that comparative glycomic profiling of EAC reveals a subset of glycans that can be selected as candidate biomarkers. These markers can differentiate disease-free from HGD, disease-free from EAC, and HGD from EAC. The clinical utility of these glycan biomarkers requires further validation
Peptides in Low Molecular Weight Fraction of Serum Associated with Hepatocellular Carcinoma
The incidence of hepatocellular carcinoma (HCC) in the United States is increasing and the increase is projected to continue for several decades. The overall survival of HCC patients is poor and treatments are not effective in part because most of the diagnoses come at a late stage. The development of new markers for detection of HCC would significantly improve patient prognosis. This paper describes identification of candidate markers previously reported in our serologic study of an Egyptian population by quantitative comparison of matrix assisted laser desorption ionization time of flight (MALDI-TOF) mass spectra. To identify these marker candidates, we performed LC-MS/MS sequencing that identified nine native peptides associated with HCC, including two reported previously. Four truncations of N terminus of complement C3f and a fibrinopeptide increased in control sera; two complement C4Ī± peptides, a zyxin peptide, and a coagulation factor XIII peptide increased in cancer patient sera. We have also identified increased biliverdin diglucuronide in the sera of cancer patients. These peptides could potentially serve as markers of HCC following additional validation studies; however, association of similar peptides with other diseases and cancers dictates a very cautious approach
MS<sup>E</sup> Based Multiplex Protein Analysis Quantified Important Allergenic Proteins and Detected Relevant Peptides Carrying Known Epitopes in Wheat Grain Extracts
The amount of clinically relevant,
allergy-related proteins in
wheat grain is still largely unknown. The application of proteomics
may create a platform not only for identification and characterization,
but also for quantitation of these proteins. The aim of this study
was to evaluate the data-independent quantitative mass spectrometry
(MS<sup>E</sup>) approach in combination with 76 wheat allergenic
sequences downloaded from the AllergenOnline database (www.allergenonline.org) as a starting point. Alcohol soluble extracts of gliadin and glutenin
proteins were analyzed. This approach has resulted in identification
and quantification of 15 allergenic protein isoforms that belong to
amylase/trypsin inhibitors, Ī³-gliadins, and high or low molecular
weight glutenins. Additionally, several peptides carrying four previously
discovered epitopes of Ī³-gliadin B precursor have been detected.
These data were validated against the UniProt database, which contained
11764 <i>Triticeae</i> protein sequences. The identified
allergens are discussed in relation to Bakerās asthma, food
allergy, wheat dependent exercise induced anaphylaxis, atopic dermatitis,
and celiac disease (i.e., gluten-sensitive enteropathy). In summary,
the results showed that the MS<sup>E</sup> approach is suitable for
quantitative analysis and allergens profiling in wheat varieties and/or
other food matrices