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    Regulation of beta catenin signaling and parathyroid hormone anabolic effects in bone by the matricellular protein periostin.

    Periostin is a matricellular protein that is preferentially expressed by osteocytes and periosteal osteoblasts in response to mechanical stimulation and parathyroid hormone (PTH). The authors investigated the skeletal response of adult periostin-deficient mice to intermittent PTH. They found that periostin-deficient mice had a lower bone mass, cortical bone volume, and strength response to PTH.  This effect appeared mediated through the regulation of sclerostin, Wnt-β-catenin signaling, and osteoblast differentiation.

    http://www.pnas.org/content/109/37/15048.long

    Bonnet N, Conway SJ, Ferrari SL.