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Arthritis Research & Therapy
Published in: Arthritis Research & Therapy 5/2013

Open Access 01-10-2013 | Research article

Glycophenotyping of osteoarthritic cartilage and chondrocytes by RT-qPCR, mass spectrometry, histochemistry with plant/human lectins and lectin localization with a glycoprotein

Authors: Stefan Toegel, Daniela Bieder, Sabine André, Friedrich Altmann, Sonja M Walzer, Herbert Kaltner, Jochen G Hofstaetter, Reinhard Windhager, Hans-Joachim Gabius

Published in: Arthritis Research & Therapy | Issue 5/2013

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Abstract

Introduction

This study aimed to characterize the glycophenotype of osteoarthritic cartilage and human chondrocytes.

Methods

Articular knee cartilage was obtained from nine osteoarthritis (OA) patients. mRNA levels for 27 glycosyltransferases were analyzed in OA chondrocytes using RT-qPCR. Additionally, N- and O-glycans were quantified using mass-spectrometry. Histologically, two cartilage areas with Mankin scores (MS) either ≤4 or ≥9 were selected from each patient representing areas of mild and severe OA, respectively. Tissue sections were stained with (1) a selected panel of plant lectins for probing into the OA glycophenotype, (2) the human lectins galectins-1 and -3, and (3) the glycoprotein asialofetuin (ASF) for visualizing β-galactoside-specific endogenous lectins.

Results

We found that OA chondrocytes expressed oligomannosidic structures as well as non-, mono- and disialylated complex-type N-glycans, and core 2 O-glycans. Reflecting B4GALNT3 mRNA presence in OA chondrocytes, LacdiNAc-terminated structures were detected. Staining profiles for plant and human lectins were dependent on the grade of cartilage degeneration, and ASF-positive cells were observed in significantly higher rates in areas of severe degeneration.

Conclusions

In summary, distinct aspects of the glycome in OA cartilage are altered with progressing degeneration. In particular, the alterations measured by galectin-3 and the pan-galectin sensor ASF encourage detailed studies of galectin functionality in OA.
Appendix
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Metadata
Title
Glycophenotyping of osteoarthritic cartilage and chondrocytes by RT-qPCR, mass spectrometry, histochemistry with plant/human lectins and lectin localization with a glycoprotein
Authors
Stefan Toegel
Daniela Bieder
Sabine André
Friedrich Altmann
Sonja M Walzer
Herbert Kaltner
Jochen G Hofstaetter
Reinhard Windhager
Hans-Joachim Gabius
Publication date
01-10-2013
Publisher
BioMed Central
Published in
Arthritis Research & Therapy / Issue 5/2013
Electronic ISSN: 1478-6362
DOI
https://doi.org/10.1186/ar4330

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