Alarmins S100A8/S100A9 aggravate osteophyte formation in experimental osteoarthritis and predict osteophyte progression in early human symptomatic osteoarthritis.

Abstract

OBJECTIVE:

Alarmins S100A8 and S100A9 are major products of activated macrophages regulating cartilage damage and synovial activation during murine and human osteoarthritis (OA). In the current study, we investigated whether S100A8 and S100A9 are involved in osteophyte formation during experimental OA and whether S100A8/A9 predicts osteophyte progression in early human OA.

METHODS:

OA was elicited in S100A9-/- mice in two experimental models that differ in degree of synovial activation. Osteophyte size, S100A8, S100A9 and VDIPEN neoepitope was measured histologically. Chondrogenesis was induced in murine mesenchymal stem cells in the presence of S100A8. Levels of S100A8/A9 were determined in plasma of early symptomatic OA participants of the Cohort Hip and Cohort Knee (CHECK) cohort study and osteophytes measured after 2 and 5 years.

RESULTS:

Osteophyte size was drastically reduced in S100A9-/- mice in ligaments and at medial femur and tibia on days 21 and 42 of collagenase-induced OA, in which synovial activation is high. In contrast, osteophyte size was not reduced in S100A9-/- mice during destabilised medial meniscus OA, in which synovial activation is scant. S100A8 increased expression and activation of matrix metalloproteinases during micromass chondrogenesis, thereby possibly increasing cartilage matrix remodelling allowing for larger osteophytes. Interestingly, early symptomatic OA participants of the CHECK study with osteophyte progression after 2 and 5 years had elevated S100A8/A9 plasma levels at baseline, while C-reactive protein, erythrocyte sedimentation rate and cartilage oligomeric matrix protein were not elevated at baseline.

CONCLUSIONS:

S100A8/A9 aggravate osteophyte formation in experimental OA with high synovial activation and may be used to predict osteophyte progression in early symptomatic human OA.

• Authors: R F P Schelbergen, W de Munter, M H J van den Bosch, F P J G Lafeber, A Sloetjes, T Vogl, J Roth, W B van den Berg, P M van der Kraan, A B Blom, P L E M van Lent
• Journal: Annals of the rheumatic diseases (Ann Rheum Dis) Vol. 75 Issue 1 Pg. 218-25 (Jan 2016) ISSN: 1468-2060 [Electronic] England
• PMID: 25180294 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

Chemical References

• Biomarkers
• Calgranulin A
• Calgranulin B
• S100A9 protein, mouse
• S100a8 protein, mouse
• Matrix Metalloproteinases

Topics

• Animals
• Arthritis, Experimental (complications, metabolism, pathology)
• Biomarkers (metabolism)
• Calgranulin A (deficiency, physiology)
• Calgranulin B (physiology)
• Cartilage, Articular (enzymology, physiopathology)
• Chondrogenesis (physiology)
• Disease Progression
• Female
• Humans
• Male
• Matrix Metalloproteinases (biosynthesis)
• Mice, Inbred C57BL
• Mice, Knockout
• Middle Aged
• Osteoarthritis (complications, metabolism, pathology)
• Osteophyte (etiology, metabolism, pathology)
• Synovial Membrane (metabolism)
• Up-Regulation (physiology)