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Infection and Immunity, August 1999, p. 4231-4236, Vol. 67, No. 8
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Interleukin-1 and Tumor Necrosis Factor Activities Partially Account for Calvarial Bone Resorption Induced by Local Injection of Lipopolysaccharide

Cheng-Yang Chiang, George Kyritsis, Dana T. Graves, and Salomon Amar*

Department of Periodontology and Oral Biology, School of Dental Medicine, Boston University, Boston, Massachusetts 02118

Received 18 March 1999/Returned for modification 22 April 1999/Accepted 10 May 1999

The present study was undertaken to test the hypothesis that tumor necrosis factor (TNF) and/or interleukin-1 (IL-1) activity mediates lipopolysaccharide (LPS)-induced bone resorption in vivo. To test this hypothesis, Escherichia coli LPS or Porphyromonas gingivalis LPS was injected into the subcutaneous tissues overlying mouse calvariae. Histological sections, prepared from the center of the lesion, were stained for tartrate-resistant acid phosphatase, and histomorphometric analysis was performed to quantify the osteoclast number and the area of bone resorption. In time course experiments using normal mice, a peak of bone resorption occurred 5 days after endotoxin stimulation. In dose-response experiments, IL-1 receptor type 1 deletion (IL-1R-/-), TNF double-receptor p55/p75 deletion (TNF p55-/-/p75-/-), combined TNF p55 and IL-1 receptor type 1 deletion (TNF p55-/-/IL-1R-/-), and IL-1beta -converting enzyme-deficient (ICE-/-) mice and the respective wild-type mice were injected with 500, 100, or 20 µg of P. gingivalis LPS and sacrificed 5 days after LPS injection. At the highest dose (500 µg), significant decreases in osteoclast number occurred in mutant mice compared to wild-type mice: (i) a 64% reduction for the TNF p55-/-/IL-1R-/- mice, (ii) a 57% reduction for the IL-1R-/- mice, (iii) a 41% reduction for the TNF p55-/-/p75-/- mice, and (iv) a 38% reduction for the ICE-/- mice. At the two lower doses, bone resorption was apparent but no significant differences between mutant and wild-type animals were observed. The present data indicate that at higher doses, LPS-induced bone resorption is substantially mediated by IL-1 and TNF receptor signaling. Furthermore, IL-1 receptor signaling appears to be slightly more important than TNF receptor signaling. At lower LPS doses, other pathways leading to osteoclast activity that are independent of TNF and IL-1 are involved.

* Corresponding author. Mailing address: Dept. of Periodontology and Oral Biology, Boston University, 100 East Newton St., G05, Boston, MA 02118. Phone: (617) 638-4983. Fax: (617) 638-8549. E-mail: samar{at}bu.edu.

Infection and Immunity, August 1999, p. 4231-4236, Vol. 67, No. 8
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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