B cells play an important role in lipopolysaccharide-induced bone resorption.
The host immune system, especially activated T cells, plays a crucial role in inflammatory bone resorption and osteoclastogenesis. Previously, we showed that T cells are involved in inflammatory bone resorption in vivo. However, little is known about whether B cells are involved in inflammatory bone resorption and how B cells take part in osteoclastogenesis. Therefore, the aim of this study was to examine whether B c ells truly influence inflammatory bone resorption in vivo. Alveolar bone resorption in normal mice, in SCID mice that lack both B and T cells, and in B cell-reconstituted SCID mice was compared histopathologically after repeated injections of lipopolysaccharide (LPS) into the gingiva. Furthermore, we examined whether the B cells that are stimulated by LPS are involved in osteoclastogenesis in vitro. As a result, the B cell-reconstituted SCID mice showed stronger inflammatory bone resorption than the SCID mice. Also, in vitro, LPS-stimulated B cells enhanced osteoclastogenesis and anti-tumor necrosis factor (TNF)-alpha antibody completely blocked osteoclastogenesis induced by LPS-stimulated B cells. These results suggest that B cells promote inflammatory bone resorption through TNF-alpha.
Division of Periodontology, Department of Developmental and Reconstructive Medicine, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan.
Y
Y
Kozuka
Y
Y
Ozaki
T
T
Ukai
T
T
Kaneko
Y
Y
Hara
D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D001854:Bone Marrow Cells / Q000166:cytology; D001862:Bone Resorption / Q000139:chemically induced* / Q000276:immunology* / Q000473:pathology; D002478:Cells, Cultured; D005269:Femur / Q000166:cytology; D005434:Flow Cytometry; D005881:Gingiva / Q000187:drug effects / Q000473:pathology; D007150:Immunohistochemistry; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D016513:Mice, SCID; D013154:Spleen / Q000166:cytology; D013977:Tibia / Q000166:cytology; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha