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T cells are able to promote lipopolysaccharide-induced bone resorption in mice in the absence of B cells.

Abstract：

BACKGROUND AND OBJECTIVE:T cells and their cytokines are believed to be key factors in periodontal disease and bone resorption. We previously showed that T cells transferred to nude mice were related to inflammatory bone resorption in vivo. However, it has not been clarified whether T cells can induce bone resorption in the absence of B cells. In this study, we therefore investigated the ability of T cells to induce bone resorption without B cells, using both T cell- and B cell-deficient mice with severe combined immune deficiency (SCID). MATERIAL AND METHODS:Escherichia coli lipopolysaccharide (LPS) was injected into the gingivae of SCID mice reconstituted by T cells (SCID + T mice). Wild-type C.B-17 mice and SCID mice were used as control animals. Alveolar bone resorption and production of cytokines in the gingivae were then compared histopathologically and immunohistologically. RESULTS:The degree of bone resorption in SCID + T mice was significantly greater than that in SCID mice but less than that in wild-type mice. The same tendency was found for expression of receptor activator of nuclear factor kappaB ligand. The number of interferon-gamma-positive cells in SCID + T mice was the highest of the three groups. In contrast, interleukin-4-positive cells were detected in wild-type mice but not in SCID + T and SCID mice. CONCLUSION:The results suggest that T cells are able to promote LPS-induced bone resorption in the absence of B cells. The expressions of cytokines in the presence of B cells are quite different.

journal_name

J Periodontal Res

journal_title

Journal of periodontal research

authors

Yamaguchi M,Ukai T,Kaneko T,Yoshinaga M,Yokoyama M,Ozaki Y,Hara Y

doi

10.1111/j.1600-0765.2008.01083.x

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

549-55

issue

5

eissn

0022-3484

issn

1600-0765

pii

JRE1083

journal_volume

43

pub_type

杂志文章

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