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Hyaluronic Acid Suppresses the Expression of Metalloproteinases in Osteoarthritic Cartilage Stimulated Simultaneously by Interleukin 1β and Mechanical Load

Florian Pohlig, Florian Guell, Ulrich Lenze, Florian W Lenze, Heinrich M L Mühlhofer, Johannes Schauwecker, Andreas Toepfer, Philipp Mayer-Kuckuk, Rüdiger Von Eisenhart-Rothe, Rainer Burgkart & Gian M Salzmann

abstract

PURPOSE
In patients with osteoarthritis (OA), intraarticular injection of hyaluronic acid (HA) frequently results in reduced pain and improved function for prolonged periods of time, i.e. more than 6 months. However, the mechanisms underlying these effects are not fully understood. Our underlying hypothesis is that HA modifies the enzymatic breakdown of joint tissues.

METHODS
To test this hypothesis, we examined osteochondral cylinders from 12 OA patients. In a bioreactor, these samples were stimulated by interleukin 1β (Il1ß) (2 ng/ml) plus mechanical load (2.0 Mpa at 0.5 Hz horizontal and 0.1 Hz vertical rotation), thus the experimental setup recapitulated both catabolic and anabolic clues of the OA joint.

RESULTS
Upon addition of HA at either 1 or 3 mg/ml, we observed a significant suppression of expression of metalloproteinase (MMP)-13. A more detailed analysis based on the Kellgren and Lawrence (K&L) OA grade, showed a much greater degree of suppression of MMP-13 expression in grade IV as compared to grade II OA. In contrast to the observed MMP-13 suppression, treatment with HA resulted in a suppression of MMP-1 expression only at 1 mg/ml HA, while MMP-2 expression was not significantly affected by either HA concentration.

CONCLUSION
Together, these data suggest that under concurrent catabolic and anabolic stimulation, HA exhibits a pronounced suppressive effect on MMP-13. In the long-run these findings may benefit the development of treatment strategies aimed at blocking tissue degradation in OA patients.
   
citation Pohlig F, Guell F, Lenze U, Lenze F W, Mühlhofer H M L, Schauwecker J, Toepfer A, Mayer-Kuckuk P, von Eisenhart-Rothe R, Burgkart R, Salzmann G M. Hyaluronic Acid Suppresses the Expression of Metalloproteinases in Osteoarthritic Cartilage Stimulated Simultaneously by Interleukin 1β and Mechanical Load. PLoS ONE 2016; 11:e0150020.
   
type journal paper/review (English)
date of publishing 02-03-2016
journal title PLoS ONE (11/3)
ISSN electronic 1932-6203
pages e0150020
PubMed 26934732
DOI 10.1371/journal.pone.0150020