Abstract
Positive regulators of bone formation, such as mechanical loading and PTH, stimulate and negative regulators, such as aging and glucocorticoid excess, suppress IL-11 gene transcription in osteoblastic cells. Signal transduction from mechanical loading and PTH stimulation involves two pathways: one is Ca2+–ERK–CREB pathway which facilitates binding of ∆FosB/JunD to the AP-1 site to enhance IL-11 gene transcription, and the other is Smad1/5 phosphorylation that promotes IL-11 gene transcription via SBE binding and complex formation with ∆FosB/JunD. The increased IL-11 suppresses Sost expression via IL-11Rα–STAT1/3–HDAC4/5 pathway and enhances Wnt signaling in the bone to stimulate bone formation. Thus, IL-11 mediates stimulatory and inhibitory signals of bone formation by affecting Wnt signaling. Physiologically important stimulation of bone formation is exercise-induced mechanical loading, but exercise simultaneously requires energy source for muscle contraction. Exercise-induced stimulation of IL-11 expression in the bone increases the secretion of IL-11 from the bone. The increased circulating IL-11 acts like a hormone to enhance adipolysis as an energy source with a reduction in adipogenic differentiation via a suppression of Dkk1/2 expression in the adipose tissue. Such bone–fat linkage can be a mechanism whereby exercise increases bone mass and, at the same time, maintains energy supply from the adipose tissue.
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Acknowledgements
Studies presented in this review were supported in part by Grants-in-Aid for Scientific Research from Japan Society for the Promotion of Science to MH (#17H05104, #19K22719, and #23H03101) and to IE (#21K07339) and the JSBMR Rising Stars Grant 2022 and Nishiyama Dental Academy General Foundation Grant to MH.
Funding
This study was supported by Japan Society for the Promotion of Science, 17H05104, Masahiro Hiasa, 19K22719, Masahiro Hiasa, 23H03101, Masahiro Hiasa, 21K07339, Itsuro Endo, The Japanese Society for Bone and Mineral Research, JSBMR Rising Stars Grant 2022, Masahiro Hiasa, Nishiyama Dental Academy, Nishiyama Dental Academy General Foundation Grant, Masahiro Hiasa.
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Hiasa, M., Endo, I. & Matsumoto, T. Bone–fat linkage via interleukin-11 in response to mechanical loading. J Bone Miner Metab (2024). https://doi.org/10.1007/s00774-023-01493-0
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DOI: https://doi.org/10.1007/s00774-023-01493-0