Abstract
Pharmacological inhibition of signaling through lysophosphatidic acid (LPA) receptors reduces bone erosions in an experimental model of arthritis by mechanisms involving reduced osteoclast differentiation and bone resorption and increased differentiation of osteoblasts and bone mineralization. These results led us to hypothesize that LPA receptor inhibition would be beneficial in osteoporosis. Our aim was to test this hypothesis with the LPA receptor antagonist, Ki16425, in ovariectomized mice, a model of postmenopausal osteoporosis. Ovariectomized mice treated with Ki16425 showed bone loss similar to that observed in the controls. Osteoblast markers, Alpl, Bglap and Col1a1, were increased at the mRNA level but no changes were detected in serum. No additional difference was observed in the Ki16425-treated mice relative to the ovariectomized controls with regard to osteoclast function markers or assays of matrix mineralization or osteoclast differentiation. Thus, pharmacological inhibition of LPA receptor was not beneficial for preventing bone loss in ovariectomized mice, indicating that its favorable effect on bone remodeling is less general than hypothesized.
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Acknowledgments
We thank Dra. M. Jesus Ramirez from Dpto. de Ciencias de la Salud (Universidad de Jaen) and Dra. L.M. Seoane and L. Senin from Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS) for advice with ovariectomy. This work was supported by grant PI11/02197, by RETICS Program, RD08/0075 (RIER), all from Fondo de Investigación Sanitaria, Instituto de Salud Carlos III with participation of FEDER funds (European Union).
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The authors declare that they have no conflict of interest.
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Orosa, B., Martínez, P., González, A. et al. Effect of lysophosphatidic acid receptor inhibition on bone changes in ovariectomized mice. J Bone Miner Metab 33, 383–391 (2015). https://doi.org/10.1007/s00774-014-0607-5
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DOI: https://doi.org/10.1007/s00774-014-0607-5