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Interleukin-6 does not stimulate bone resorption in neonatal mouse calvariae
A al-Humidan1, S H Ralston, D E Hughes
1Department of Human Metabolism and Clinical Biochemistry, Sheffield University Medical School, UK.
Summary
Interleukin-6 (IL-6) does not directly stimulate bone resorption. However, IL-6 may locally inhibit bone resorption induced by hormones and play a role in systemic responses.
Area of Science:
- Endocrinology
- Immunology
- Bone Biology
Background:
- Interleukin-6 (IL-6) is a cytokine with diverse roles in inflammation and immunity.
- Its specific role in bone metabolism, particularly bone resorption, requires further elucidation.
Purpose of the Study:
- To investigate the direct effect of recombinant human IL-6 on bone resorption in vitro.
- To determine if IL-6 modulates bone resorption stimulated by other known bone-active agents.
Main Methods:
- Neonatal mouse calvariae were prelabeled with 45Ca.
- Calvariae were cultured in vitro with varying concentrations of human recombinant IL-6.
- Resorption was assessed by measuring 45Ca release into the culture medium.
- Effects of IL-6 on resorption stimulated by IL-1 alpha, PTH, and 1,25-(OH)2D3 were evaluated.
Main Results:
- IL-6 alone did not stimulate bone resorption across a wide concentration range.
- IL-6 did not affect IL-1 alpha-stimulated bone resorption.
- IL-6 inhibited bone resorption stimulated by parathyroid hormone (PTH) and 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3].
- PTH, 1,25-(OH)2D3, and IL-1 alpha induced IL-6 release from the calvariae.
Conclusions:
- IL-6 does not directly stimulate bone resorption in neonatal mouse calvariae.
- IL-6 may function as a local inhibitor and paracrine regulator of bone resorption induced by osteotropic hormones.
- IL-6 could also contribute to systemic responses to inflammatory and neoplastic bone lesions.