T cell-expressed CD40L potentiates the bone anabolic activity of intermittent PTH treatment.

T cell-expressed CD40L potentiates the bone anabolic activity of intermittent PTH treatment.
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DOI:
10.1002/jbmr.2394
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发表时间:
2015-04
影响因子:
6.2
通讯作者:
Pacifici, Roberto
Pacifici, Roberto
中科院分区:
医学1区
文献类型:
--
作者:
Robinson, Jerid W.;Li, Jau-Yi;Walker, Lindsey D.;Tyagi, Abdul Malik;Reott, Michael A.;Yu, Mingcan;Adams, Jonathan;Weitzmann, M. Neale;Pacifici, Roberto

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已知T细胞增强间歇性甲状旁腺激素(iPTH)治疗的骨合成代谢活性。其中一个相关机制是增加T细胞分泌Wnt 10 b,这是一种有效的成骨Wnt配体,可激活基质细胞(SC)中的Wnt信号。然而,其他机制可能发挥作用,包括T细胞和SC表达的表面受体之间的直接相互作用。在这里,我们表明,iPTH未能促进SC增殖和分化成骨细胞(OB)和激活Wnt信号在SC的小鼠与全球或T细胞特异性缺失的T细胞共刺激分子CD 40配体(CD 40 L)。证明了T细胞表达的CD 40 L的相关性,iPTH诱导了骨形成的钝性增加,并且未能增加CD 40 L −/−小鼠和T细胞特异性缺失CD 40 L的小鼠的骨小梁体积。CD 40 L敲除小鼠表现出对iPTH治疗的响应,T细胞产生Wnt 10 b的钝性增加和SC中CD 40信号传导的消除。因此,T细胞表面受体CD 40 L的表达使iPTH能够通过激活SC中的CD 40信号传导并最大限度地刺激T细胞产生Wnt 10 b来发挥其骨合成代谢活性。
T cells are known to potentiate the bone anabolic activity of intermittent parathyroid hormone (iPTH) treatment. One of the involved mechanisms is increased T cell secretion of Wnt10b, a potent osteogenic Wnt ligand that activates Wnt signaling in stromal cells (SCs). However, additional mechanisms might play a role, including direct interactions between surface receptors expressed by T cells and SCs. Here we show that iPTH failed to promote SC proliferation and differentiation into osteoblasts (OBs) and activate Wnt signaling in SCs of mice with a global or T cell-specific deletion of the T cell costimulatory molecule CD40 ligand (CD40L). Attesting to the relevance of T cell expressed CD40L, iPTH induced a blunted increase in bone formation and failed to increase trabecular bone volume in CD40L−/− mice and mice with a T cell-specific deletion of CD40L. CD40L null mice exhibited a blunted increase in T cell production of Wnt10b and abrogated CD40 signaling in SCs in response to iPTH treatment. Therefore, expression of the T cell surface receptor CD40L enables iPTH to exert its bone anabolic activity by activating CD40 signaling in SCs and maximally stimulating T cell production of Wnt10b.
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