Cellular and epigenetic features of a young healthy and a young osteoarthritic cartilage compared with aged control and OA cartilage


da Silva, M.A., Yamada, N., Clarke, N.M. and Roach, H.I. (2008) Cellular and epigenetic features of a young healthy and a young osteoarthritic cartilage compared with aged control and OA cartilage. Journal of Orthopaedic Research, 27, (5), 593-601. (doi:10.1002/jor.20799).

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Original Publication URL: http://dx.doi.org/10.1002/jor.20799

Description/Abstract

Osteoarthritis (OA) is generally a disease of the elderly population, but can occur in young patients in exceptional cases. This study compares the cellular and epigenetic features of primary old-age OA with those of secondary OA in a 23-year old patient with Developmental Dysplasia of the Hip. In addition, control cartilage from a 14-year old was compared with that from patients with a fracture of the neck of femur (#NOF) to establish to what extent the latter is a useful control for OA. Articular cartilage was obtained from discarded femoral heads after hip arthroplasty. MMP-3, MMP-9, MMP-13 and ADAMTS-4 were immuno-localized and the methylation status of specific promoter CpG sites was determined. Both primary and secondary OA were characterized by loss of aggrecan, formation of clones, abnormal expression of the proteases that correlated with epigenetic DNA de-methylation The latter indicated that the abnormal expression of the cartilage-degrading proteases was not due to a short-term up-regulation, but a heritable, permanent alteration in gene expression.
Comparing cell densities in young and old control cartilage estimated an age-related cell loss of ~1% per year. In aged #NOF cartilage, some superficial-zone chondrocytes expressed the proteases, but the majority of cells were immuno-negative and their promoters were hypermethylated. The cellular and epigenetic features of the intermediate and deep zones of #NOF cartilage are thus similar to those of young healthy cartilage, justifying the use of #NOF cartilage as control cartilage for OA, providing the superficial zone is removed.

Item Type: Article
ISSNs: 0736-0266 (print)
Related URLs:
Keywords: osteoarthritis, epigenetics, developmental dysplasia of the hip (DDH), DNA methylation, articular chondrocytes
Subjects: R Medicine > RZ Other systems of medicine
Divisions: University Structure - Pre August 2011 > School of Medicine > Developmental Origins of Health and Disease
ePrint ID: 72831
Date Deposited: 24 Feb 2010
Last Modified: 27 Mar 2014 18:51
URI: http://eprints.soton.ac.uk/id/eprint/72831

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