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SHIP-deficient mice are severely osteoporotic due to increased numbers of hyper-resorptive osteoclasts

Abstract

The hematopoietic-restricted protein Src homology 2–containing inositol-5-phosphatase (SHIP) blunts phosphatidylinositol-3-kinase-initiated signaling by dephosphorylating its major substrate, phosphatidylinositol-3,4,5-trisphosphate. As SHIP−/− mice contain increased numbers of osteoclast precursors, that is, macrophages, we examined bones from these animals and found that osteoclast number is increased two-fold. This increased number is due to the prolonged life span of these cells and to hypersensitivity of precursors to macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor-κB ligand (RANKL). Similar to pagetic osteoclasts, SHIP−/− osteoclasts are enlarged, containing upwards of 100 nuclei, and exhibit enhanced resorptive activity. Moreover, as in Paget disease, serum levels of interleukin-6 are markedly increased in SHIP−/− mice. Consistent with accelerated resorptive activity, 3D trabecular volume fraction, trabecular thickness, number and connectivity density of SHIP−/− long bones are reduced, resulting in a 22% loss of bone-mineral density and a 49% decrease in fracture energy. Thus, SHIP negatively regulates osteoclast formation and function and the absence of this enzyme results in severe osteoporosis.

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Figure 1: Absence of SHIP results in increased OCs.
Figure 2: Osteoclastogenesis by M-CSF and RANKL is increased in SHIP−/−mice.
Figure 3: SHIP deficiency results in decreased OC apoptosis.
Figure 4: SHIP suppresses osteoclastic bone resorption and serum IL-6 levels.
Figure 5: SHIP−/− mice are osteoporotic.
Figure 6: SHIP−/− bones have reduced areal BMD and whole-bone strength.

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Acknowledgements

This work was supported by grants from National Institutes of Health (NIH) to S.L.T. and F.P.R. and the National Cancer Institute of Canada ro K.A.H. and G.K.

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Correspondence to F. Patrick Ross.

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Takeshita, S., Namba, N., Zhao, J. et al. SHIP-deficient mice are severely osteoporotic due to increased numbers of hyper-resorptive osteoclasts. Nat Med 8, 943–949 (2002). https://doi.org/10.1038/nm752

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