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• W2022275682 abstract "Pregnancy-associated plasma protein (PAPP)-A, a protease for IGF binding protein (IGFBP)-2, -4, and -5, may enhance IGF action by increasing its bioavailability. Here we have determined the role and mechanism of action of PAPP-A in the regulation of osteoblast proliferation in vitro and bone metabolism in vivo. Recombinant PAPP-A (100 ng/ml) significantly increased osteoblast proliferation and free IGF-I concentration. These effects were abolished by noncleavable IGFBP-4, suggesting that PAPP-A promotes osteoblast proliferation by increasing IGF bioavailability. To determine whether PAPP-A exerts an anabolic effect on bone in vivo, we developed transgenic mice that overexpress PAPP-A in osteoblasts using the 2.3-kb rat type I collagen promoter. Consistent with the increase in IGFBP-4 proteolysis, free IGF-I concentration was significantly increased in the conditioned medium of cultured osteoblasts derived from transgenic mice compared with the wild-type littermates. Calvarial bone thickness, bone marrow cavity, and skull bone mineral density were significantly increased in transgenic mice. Bone size-related parameters in femur and tibia such as total bone area and periosteal circumference as determined by peripheral quantitated computed tomography and histological analysis were significantly increased in transgenic mice. Bone formation rate and osteoid surface were increased by more than 2-fold, whereas bone resorbing surface was unaffected. These anabolic effects were sustained with aging. These findings provide strong evidence that PAPP-A acts as a potent anabolic factor in the regulation of bone formation. Thus, enhancing IGF bioavailability by PAPP-A can be a powerful strategy in the treatment of certain metabolic diseases such as osteoporosis." @default.
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• W2022275682 date "2006-12-01" @default.
• W2022275682 modified "2023-09-28" @default.
• W2022275682 title "Pregnancy-Associated Plasma Protein-A Increases Osteoblast Proliferation in Vitro and Bone Formation in Vivo" @default.
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• W2022275682 doi "https://doi.org/10.1210/en.2006-1055" @default.
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