T lymphocytes amplify the anabolic activity of parathyroid hormone through Wnt10b signaling.

T lymphocytes amplify the anabolic activity of parathyroid hormone through Wnt10b signaling.
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DOI:
10.1016/j.cmet.2009.07.010
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发表时间:
2009-09
期刊:
影响因子:
29
通讯作者:
Pacifici R
Pacifici R
中科院分区:
生物学1区
文献类型:
--
作者:
Terauchi M;Li JY;Bedi B;Baek KH;Tawfeek H;Galley S;Gilbert L;Nanes MS;Zayzafoon M;Guldberg R;Lamar DL;Singer MA;Lane TF;Kronenberg HM;Weitzmann MN;Pacifici R

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间歇性甲状旁腺激素(IPTH)用于治疗骨质疏松症,因为它可以改善骨骼结构和强度,但其潜在的细胞和分子机制尚不清楚。在这里,我们显示iPTH增加骨髓CD8+T细胞产生Wnt10b,并诱导这些淋巴细胞激活成骨前细胞中典型的Wnt信号。因此,在对iPTH的反应中,T细胞缺失的小鼠表现出成骨前细胞中Wnt信号的减弱,成骨细胞的承诺、增殖、分化和寿命减弱,导致骨小梁合成代谢减少,强度没有增加。IPTH在缺乏产生Wnt10b的T细胞的小鼠中没有合成代谢活性,这证明了淋巴细胞Wnt10b的特殊作用。因此,T细胞介导的成骨细胞Wnt信号的激活在iPTH增加骨强度的机制中起着关键的许可作用,提示T细胞成骨细胞串扰通路可能为骨合成代谢提供药理学靶点。
Intermittent administration of parathyroid hormone (iPTH) is used to treat osteoporosis as it improves bone architecture and strength, but the underlying cellular and molecular mechanisms are unclear. Here we show that iPTH increases the production of Wnt10b by bone marrow CD8+ T cells, and induces these lymphocytes to activate canonical Wnt-signaling in pre-osteoblasts. Accordingly, in responses to iPTH, T cell null mice display diminished Wnt signaling in pre-osteoblasts and blunted osteoblastic commitment, proliferation, differentiation and lifespan which result in decreased trabecular bone anabolism and no increase in strength. Demonstrating the specific role of lymphocytic Wnt10b, iPTH has no anabolic activity in mice lacking T cell produced Wnt10b. Therefore, T cell mediated activation of Wnt signaling in osteoblastic cells plays a key permissive role in the mechanism by which iPTH increases bone strength, suggesting that T cell osteoblast cross-talk pathways may provide pharmacological targets for bone anabolism.
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