Expression of cathepsin K and matrix metalloproteinase 1 indicate persistent osteodestructive activity in long-standing ankylosing spondylitis

Neidhart, M. and Baraliakos, X. and Seemayer, C. and Zelder, C. and Gay, R. E. and Michel, B. A. and Boehm, H. and Gay, S. and Braun, J.. (2009) Expression of cathepsin K and matrix metalloproteinase 1 indicate persistent osteodestructive activity in long-standing ankylosing spondylitis. Annals of the rheumatic diseases : ARD, Vol. 68. pp. 1334-1339.

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Official URL: http://edoc.unibas.ch/dok/A6005069

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BACKGROUND: Ankylosing spondylitis (AS) is a common, largely genetically determined, rheumatic disease that is characterised by spinal inflammation and new bone formation. However, the exact pathogenesis and pathology are still not clear. OBJECTIVE: To analyse tissue obtained at spinal surgery by immunohistochemistry and compare the specimen of patients with AS to those with degenerative disc disease (DDD). METHODS: Bony and soft tissue specimens of 30 patients with AS and 20 with DDD were obtained during spinal osteotomy from different anatomic regions including articular and spinous processes, interspinous ligaments and intervertebral disks. Immunohistolochemistry was performed with established markers for cathepsin K, matrix metalloproteinase (MMP)1, MMP3 and receptor activator for nuclear factor kappaB (RANK) ligand. RESULTS: Cathepsin K and MMP1-positive cells were only observed in AS specimens. Cathepsin K-positive multinucleated cells were detected at articular processes adjacent to fibrous tissues. MMP1 was expressed in smaller mononuclear cells attached to bone. Invasion of bone by MMP1 cells was seen at entheseal sites. In the intervertebral disks, most mononuclear cells were cathepsin K-positive. Isolated cells expressing these matrix-degrading enzymes found in DDD never showed signs of invasion. No differences were found for MMP3 between AS and DDD. Clear expression of RANK ligand was only detected in one patient with AS. CONCLUSIONS: Cathepsin K is strongly expressed in different regions of the spine in AS. Cathepsin K was mainly expressed by mononuclear cells, fibroblast-like cells and cells attached to bone and at sites of bone remodelling, suggestive of high osteoclastic activity. This supports the role of persistent inflammation in the pathogenesis of AS. How these changes relate to osteoproliferation remains to be determined.
Faculties and Departments:03 Faculty of Medicine > Bereich Querschnittsfächer (Klinik) > Pathologie USB
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Querschnittsfächer (Klinik) > Pathologie USB
UniBasel Contributors:Seemayer, Christian A.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:British Medical Association
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 May 2013 09:21
Deposited On:24 May 2013 08:59

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