Journal List > J Korean Acad Periodontol > v.37(Suppl) > 1049666

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Choi, Lee, Kim, Kim, Cha, and Yoo: Induction of osteoclastogenesis-inducing cytokines and invasion by alive Aggregatibacter actinomycetemcomitans in osteoblasts
Original Article

The Journal of the Korean Academy of Periodontology 2007; 37(3): 553-562.

Published online: 30 September 2007

DOI: https://doi.org/10.5051/jkape.2007.37.3.553

Induction of osteoclastogenesis-inducing cytokines and invasion by alive Aggregatibacter actinomycetemcomitans in osteoblasts

Ho Kil Choi1, Yang Sin Lee2, Min Young Kim1, Kyoung Dae Kim2, Jeong Heon Cha3, Yun Jung Yoo3

1Department of Oral Biology, Brain Korea 21 project, College of Dentistry, Yonsei University, Korea.

2Department of Oral Biology, College of Dentistry, Yonsei University, Korea.

3Department of Oral Biology, Brain Korea 21 project and Oral Science Research Center, College of Dentistry, Yonsei University, Korea.

Corresponding Author (yu618@yuhs.ac.kr)

Copyright © 2007 Korean Academy of Periodontology

Abstract

Osteoblasts regulate osteoclastogenesis by production of various cytokines. Aggregatibacter(A) actinomycetemcomitans is one of periodontopathogens which invades gingival tissue. Therefore, clarifying the effect of alive A. actinomycetemcomitans on osteoblasts is important to understand the mechanism of alveolar bone resorption in periodontitis. We investigated induction of osteoclastogenesis-inducing cytokines, adherence, and invasion by A. actinomycetemcomitans in osteoblasts. Osteoblasts were isolated from mouse calvaria and expression of cytokines was determined by RT-PCR.
When the ratio of the number of A. actinomycetemcomtians to the number of osteoblasts was 10:1, 50:1 and 100:1, RANKL mRNA expression was increased. A. actinomycetemcomitans also increased expression of macrophage inflammatory protein (MIP)-1α, interleukin (IL)-1β, and tumor necrosis factor (TNF)-α. A. actinomycetemcomitans attached to and invaded osteoblasts at ratio of 1000:1. These results suggest that A. actinomycetemcomitans increases osteoclastogenesis-inducing ability of osteoblasts by stimulating the expression of RANKL, MIP-1α, IL-1β, and TNF-α and that invasion of A. actinomycetemcomitans provides a means by which the bacteria escape from immune system and antibiotic therapy.

Keywords: Aggregatibacter actinomycetemcomitans, osteoblast, osteoclastogenesis-inducing cytokine, invasion

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