Lysyl oxidase (lox) gene deficiency affects osteoblastic phenotype.

Lysyl oxidase (lox) gene deficiency affects osteoblastic phenotype.
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DOI:
10.1007/s00223-009-9252-8
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发表时间:
2009-08
影响因子:
4.2
通讯作者:
Trackman, P. C.
Trackman, P. C.
中科院分区:
医学3区
文献类型:
--
作者:
Pischon, N.;Maki, J. M.;Weisshaupt, P.;Heng, N.;Palamakumbura, A. H.;N'Guessan, P.;Ding, A.;Radlanski, R.;Renz, H.;Bronckers, T. A. L. J. J.;Myllyharju, J.;Kielbassa, A. M.;Kleber, B. M.;Bernimoulin, J. -P.;Trackman, P. C.

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赖氨酰氧化酶(LOX)催化弹性蛋白和胶原蛋白的交联,这对骨组织的结构完整性和功能至关重要。本研究检测了Lox基因缺陷对E18.5 Lox基因敲除(Lox-/-)和野生型(wt)(C57 BL/6)小鼠原代颅骨成骨细胞表型的作用。紧接着Lox基因缺失,Lox同种型LOXL 1 -4的mRNA表达在Lox-/-骨组织中显著下调。与野生型相比,Lox-/-成骨细胞的DNA合成显著减少,Annexin-V结合研究的成骨细胞凋亡的早期阶段以及DNA片段化的后期阶段不受影响。然而,成骨细胞标志物、I型胶原、BSP和Runx 2/Cbfa 1的显著下调显示,矿物质结节形成和成骨细胞分化显著减少。
Lysyl oxidase (LOX) catalyzes cross-linking of elastin and collagen, which is essential for structural integrity and function of bone tissue. The present study examined the role of Lox gene deficiency for the osteoblast phenotype in primary calvarial osteoblasts from E18.5 Lox knockout (Lox-/-) and wild type (wt) (C57 BL/6) mice. Next to Lox gene depletion, mRNA expression of Lox isoforms, LOXL1-4, was significantly down-regulated in Lox-/- bone tissue. A significant decrease of DNA synthesis of Lox-/- osteoblasts compared to wt was found. Early stages of osteoblastic apoptosis studied by Annexin-V binding as well as later stages of DNA fragmentation were not affected. However, mineral nodule formation and osteoblastic differentiation were markedly decreased, as revealed by significant down-regulation of osteoblastic markers, type I collagen, BSP and Runx2/Cbfa1.
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