Universität zu Köln

Severmann, A. -C., Jochmann, K., Feller, K., Bachvarova, V., Piombo, V., Stange, R., Holzer, T., Brachvogel, B., Esko, J., Pap, T., Hoffmann, D. and Vortkamp, A. (2020). An altered heparan sulfate structure in the articular cartilage protects against osteoarthritis. Osteoarthritis Cartilage, 28 (7). S. 977 - 988. OXFORD: ELSEVIER SCI LTD. ISSN 1522-9653

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Abstract

Objective: Osteoarthritis (OA) is a progressive degenerative disease of the articular cartilage caused by an unbalanced activity of proteases, cytokines and other secreted proteins. Since heparan sulfate (HS) determines the activity of many extracellular factors, we investigated its role in OA progression. Methods: To analyze the role of the HS level, OA was induced by anterior cruciate ligament transection (ACLT) in transgenic mice carrying a loss-of-function allele of Ext1 in clones of chondrocytes (Col2-rtTA-Cre;Ext1(e2fl/e2fl)). To study the impact of the HS sulfation pattern, OA was surgically induced in mice with a heterozygous (Ndst1(+/-)) or chondrocyte-specific (Col2-Cre;Ndst1(fl/fl)) loss-of-function allele of the sulfotransferase Ndst1. OA progression was evaluated using the OARSI scoring system. To investigate expression and activity of cartilage degrading proteases, femoral head explants of Ndst1(+/-) mutants were analyzed by qRT-PCR, Western Blot and gelatin zymography. Results: All investigated mouse strains showed reduced OA scores (Col2-rtTA-Cre;Ext1(e2fl/e2fl): 0.83; 95% HDI 0.72-0.96; Ndst1(+/-): 0.83, 95% HDI 0.74-0.9; Col2-Cre;Ndst1(fl/fl): 0.87, 95% HDI 0.76-1). Using cartilage explant cultures of Ndst1 animals, we detected higher amounts of aggrecan degradation products in wildtype samples (NITEGE 4.24-fold, 95% HDI 1.05-18.55; VDIPEN 1.54-fold, 95% HDI 1.54-2.34). Accordingly, gelatin zymography revealed lower Mmp2 activity in mutant samples upon RA-treatment (0.77-fold, 95% HDI: 0.60-0.96). As expression of major proteases and their inhibitors was not altered, HS seems to regulate cartilage degeneration by affecting protease activity. Conclusion: A decreased HS content or a reduced sulfation level protect against OA progression by regulating protease activity rather than expression. (c) 2020 The Author(s). Published by Elsevier Ltd on behalf of Osteoarthritis Research Society International. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Severmann, A. -C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jochmann, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Feller, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bachvarova, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Piombo, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stange, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Holzer, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brachvogel, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Esko, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pap, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoffmann, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vortkamp, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-328192
DOI:	10.1016/j.joca.2020.04.002
Journal or Publication Title:	Osteoarthritis Cartilage
Volume:	28
Number:	7
Page Range:	S. 977 - 988
Date:	2020
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1522-9653
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MATRIX METALLOPROTEINASES; GELATINASE-A; MICE LACKING; LONG BONES; EXPRESSION; EXT1; DEGRADATION; ACTIVATION; INHIBITORS; AGGRECAN Multiple languages Orthopedics; Rheumatology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32819