Lrp5-independent activation of Wnt signaling by lithium chloride increases bone formation and bone mass in mice

Philippe Clément-Lacroix, Minrong Ai, Frederic Morvan, Sergio Roman-Roman, Béatrice Vayssière, Cecille Belleville, Kenneth Estrera, Matthew L. Warman, Roland Baron, Georges Rawadi

Research output: Contribution to journalArticle

330 Scopus citations

Abstract

One of the well characterized cell biologic actions of lithium is the inhibition of glycogen synthase kinase-3β and the consequent activation of canonical Wnt signaling. Because deficient Wnt signaling has been implicated in disorders of reduced bone mass, we tested whether lithium could improve bone mass in mice. We gavage-fed lithium chloride to 8-week-old mice from three different strains (Lrp5-/-, SAMP6, and C57BL/6) and assessed the effect on bone metabolism after 4 weeks of therapy. Lrp5-/- mice lack the Wnt coreceptor low-density lipoprotein receptor-related protein 5 and have markedly reduced bone mass. Lithium, which is predicted to act downstream of this receptor, restored bone metabolism and bone mass to near wild-type levels in these mice. SAMP6 mice have accelerated osteoporosis due to inadequate osteoblast renewal. Lithium significantly improved bone mass in these mice and in wild-type C57BL/6 mice. We found that lithium activated canonical Wnt signaling in cultured calvarial osteoblasts from Lrp5-/- mice ex vivo and that lithium-treated mice had increased expression of Wnt-responsive genes in their bone marrow cells in vivo. These data lead us to conclude that lithium enhances bone formation and improves bone mass in mice and that it may do so via activation of the canonical Wnt pathway. Lithium has been used safely and effectively for over half a century in the treatment of bipolar illness. Prospective studies in patients receiving lithium should determine whether it also improves bone mass in humans.

Original languageEnglish (US)
Pages (from-to)17406-17411
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number48
DOIs
StatePublished - Nov 29 2005

Keywords

  • Anabolic
  • Osteoporosis
  • Therapy

ASJC Scopus subject areas

  • General

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    Clément-Lacroix, P., Ai, M., Morvan, F., Roman-Roman, S., Vayssière, B., Belleville, C., Estrera, K., Warman, M. L., Baron, R., & Rawadi, G. (2005). Lrp5-independent activation of Wnt signaling by lithium chloride increases bone formation and bone mass in mice. Proceedings of the National Academy of Sciences of the United States of America, 102(48), 17406-17411. https://doi.org/10.1073/pnas.0505259102