Quantitative determination of haptoglobin glycoform variants in psoriasis
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Bernardetta Maresca
Abstract
Haptoglobin is an acute phase glycoprotein, secreted by hepatocytes and other types of cells including keratinocytes. Haptoglobin has been suggested to impair the immune response, inhibit gelatinases in the extracellular matrix and promote angiogenesis, but its role in psoriasis is obscure to date. Changes in haptoglobin glycan structure were observed in several diseases. The aim of this study was to investigate whether haptoglobin displays glycan variations in psoriasis. We found that the pattern of plasma haptoglobin glycoforms, following two-dimensional electrophoresis, exhibited significant quantitative differences in spot intensities between patients and controls. Quantitative and qualitative differences in glycan mass, between patients and controls, were found by mass spectrometry of glycopeptides from tryptic digests of protein isolated from both patients and controls. The number of distinct fucosylated glycoforms of peptides NLFLNHSENATAK and MVSHHNLTTGATLINEQWLLTTAK was higher in patients than in controls, but no fucosylated glycan was detected on peptide VVLHPNYSQ-VDIGLIK in either case. The number of peptides with distinct triantennary and tetraantennary glycans was higher in patients than in controls. Abundance or structure of specific glycans, which are present in haptoglobin from patients and are different or missing in normal haptoglobin, might be associated with disease activity.
©2010 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Minireview
- Physiology and pathophysiology of the RANKL/RANK system
- Genes and Nucleic Acids
- Murine aldo-keto reductase family 1 subfamily B: identification of AKR1B8 as an ortholog of human AKR1B10
- Characterization of plant miRNAs and small RNAs derived from potato spindle tuber viroid (PSTVd) in infected tomato
- Protein Structure and Function
- Characterization of a mutant R11H αB-crystallin associated with human inherited cataract
- Secretion of hepatoma-derived growth factor is regulated by N-terminal processing
- Twin arginine translocation (Tat)-dependent protein transport: the passenger protein participates in the initial membrane binding step
- Kinetic and structural characterization of bacterial glutaminyl cyclases from Zymomonas mobilis and Myxococcus xanthus
- Membranes, Lipids, Glycobiology
- Quantitative determination of haptoglobin glycoform variants in psoriasis
- Molecular Medicine
- Bile acid retention and activation of endogenous hepatic farnesoid-X-receptor in the pathogenesis of fatty liver disease in ob/ob-mice
- Cell Biology and Signaling
- Acute and long-term effects of metformin on the function and insulin secretory responsiveness of clonal β-cells
- Proteolysis
- Increase of SARS-CoV 3CL peptidase activity due to macromolecular crowding effects in the milieu composition
- Pharmacological and genetic evidence that cathepsin B is not the physiological activator of rodent prorenin
- Acknowledgement
- Acknowledgement
