Molecular and Cellular Microbiology / Biomedical Sciences | Pathogenesis and Host-Microbial interactions
Microbiol. Biotechnol. Lett. 2016; 44(4): 557-562
https://doi.org/10.4014/mbl.1608.08010
Ok-Jin Park , Yeongkag Kwon , Cheol-Heui Yun and Seung Hyun Han *
11Department of Oral Microbiology and Immunology, DRI and BK21 Plus Program, School of Dentistry, Seoul National University, Seoul 08826, Republic of Korea , 2Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
Aggregatibacter actinomycetemcomitans and Porphyromonas gingivalis are gram-negative bacteria frequently found in lesions from patients with periodontitis manifesting alveolar bone loss. Lipopolysaccharides are a major virulence factor of gram-negative bacteria. Bone resorption is known to be regulated by bacteria and their virulence factors. In the present study, we investigated the effects of A. actinomycetemcomitans and P. gingivalis on bone resorption. Heat-killed A. actinomycetemcomitans (HKAa) and heatkilled P. gingivalis (HKPg) induced bone loss in the femurs of mice after intraperitoneal administration. HKAa and HKPg augmented the differentiation of committed osteoclast precursors into osteoclasts, while they inhibited the differentiation of bone marrow-derived macrophages into osteoclasts. Concordant with the effects of the heat-killed whole cells, LPS purified from A. actinomycetemcomitans and P. gingivalis also augmented osteoclast differentiation from committed osteoclast precursors but attenuated it from bone marrow-derived macrophages. Taken together, these results suggest that the whole cells and lipopolysaccharides of A. actinomycetemcomitans and P. gingivalis induce the differentiation of committed osteoclast precursors into osteoclasts, potentially contributing to bone resorption in vivo.
Keywords: Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, lipopolysaccharide, osteoclast, bone loss
Ji-Won Park, Jin-Mi Park, Sangmi Eum, Jung Hee Kim, Jae Hoon Oh, Jinseon Choi, Tran The Bach, Nguyen Van Sinh, Sangho Choi, Kyung-Seop Ahn, and Jae-Won Lee
Microbiol. Biotechnol. Lett. 2022; 50(4): 574-583 https://doi.org/10.48022/mbl.2206.06004