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Related Experiment Video

Updated: Jun 22, 2026

Osteoclast Derivation from Mouse Bone Marrow
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Interleukin-1 receptor antagonist and tumor necrosis factor binding protein decrease osteoclast formation and bone

R Kitazawa1, R B Kimble, J L Vannice

  • 1Division of Bone and Mineral Diseases, Washington University School of Medicine, St. Louis, Missouri.

The Journal of Clinical Investigation
|December 1, 1994
PubMed
Summary
This summary is machine-generated.

Estrogen deficiency increases osteoclastogenesis via IL-1 and TNF. Inhibiting these cytokines, but not IL-6, prevents bone loss in ovariectomized mice, revealing their direct role in bone resorption.

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Area of Science:

  • Immunology
  • Endocrinology
  • Bone Biology

Background:

  • Estrogen deficiency, common after ovariectomy (ovx), is linked to increased osteoclastogenesis and bone resorption.
  • Interleukins (IL-1, IL-6) and Tumor Necrosis Factor (TNF) are implicated in inflammatory bone loss.

Purpose of the Study:

  • To determine the specific roles of IL-1, IL-6, and TNF in mediating osteoclastogenesis and bone resorption following estrogen deficiency.

Main Methods:

  • Ovariectomized (ovx) mice were treated with inhibitors of IL-1 (IL-1ra), TNF (TNFbp), or IL-6 (anti-IL-6 Ab).
  • Bone marrow cell cultures were assessed for osteoclast formation (MNCs) and bone resorption.
  • In vivo bone resorption was measured via urinary pyridinoline cross-links and in vitro via resorption pits.

Main Results:

  • Ovx increased IL-1 and TNF secretion and osteoclast formation, but not IL-6.
  • In vivo treatment with IL-1ra, TNFbp, or anti-IL-6 Ab prevented ovx-induced increases in MNC formation.
  • IL-1ra and TNFbp were effective in ovx mice, while anti-IL-6 Ab showed similar effects in ovx and sham mice.
  • IL-1ra and TNFbp reduced MNC formation in vitro, but anti-IL-6 Ab did not.
  • Ovx increased bone resorption, which was reduced by IL-1ra, TNFbp, and estrogen in vivo and in vitro.
  • Anti-IL-6 Ab inhibited bone resorption in vitro but not in vivo.

Conclusions:

  • IL-1 and TNF play direct roles in mediating the effects of estrogen deficiency on osteoclastogenesis and bone resorption.
  • IL-6 is not essential for the early increase in bone resorption after ovariectomy.