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J Clin Periodontol. 2011 Feb;38(2):122-30. doi: 10.1111/j.1600-051X.2010.01645.x. Epub 2010 Nov 10.

Mechanism of alveolar bone loss in a collagen-induced arthritis model in mice.

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  • 1Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry, Yonsei University, Seoul, Korea.

Abstract

OBJECTIVE:

the aim of this study was to understand the cellular/molecular mechanisms of periodontal breakdown in a collagen-induced arthritis (CIA) model in mice to enhance the understanding of rheumatoid arthritis (RA)-associated alveolar bone loss in humans.

MATERIALS AND METHODS:

all analyses were performed on paired samples from CIA and control group mice. Mandibles were retrieved for micro-computed tomography (micro-CT), histomorphometric analysis, and isolation of alveolar bone cells (ABCs). In vitro osteoclastogenic/osteogenic/adipogenic potentials of ABCs were evaluated and the mRNA expression of downstream effector genes was assessed. Bone formation of ABCs was assessed using an ectopic transplantation model.

RESULTS:

histomorphometric and micro-CT data showed that alveolar bone loss was significantly increased in the CIA group (p<0.05). Osteoclastogenesis was significantly increased in the CIA group in vivo (p<0.05), with upregulated mRNA expressions of osteoclastogenesis-associated genes. Osteoblasts appeared to undergo increased apoptosis, and the bone-forming activity of ABCs concomitantly decreased with in vitro osteogenic differentiation and in vivo ectopic transplantation (p<0.05). Also, adipogenesis-associated mRNA expression was highly expressed in the CIA group, resulting in significantly enhanced adipocyte differentiation in vitro (p<0.05).

CONCLUSIONS:

these data demonstrate that increased osteoclastic activity, decreased bone-forming activity and enhanced adipogenesis promote alveolar bone loss in a CIA model in mice, and they suggest that these mechanisms could account for the same outcome in human RA.

PMID:
21062340
[PubMed - indexed for MEDLINE]
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