Expression of the dermatomyositis autoantigen Mi-2 in regenerating muscle.

Expression of the dermatomyositis autoantigen Mi-2 in regenerating muscle.
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DOI:
10.1002/art.24977
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发表时间:
2009-12
影响因子:
--
通讯作者:
Rosen, Antony
Rosen, Antony
中科院分区:
其他
文献类型:
--
作者:
Mammen, Andrew L.;Casciola-Rosen, Livia A.;Hall, John C.;Christopher-Stine, Lisa;Corse, Andrea M.;Rosen, Antony

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在皮肌炎 (DM) 患者的一个独特亚群中发现了针对染色质重塑剂 Mi-2 的自身抗体。先前的定量免疫印迹实验表明,DM 肌肉中 Mi-2 蛋白上调。我们进行这项研究是为了定义 DM 肌肉中表达高水平 Mi-2 的细胞群,并探索 Mi-2 在肌肉再生过程中的调节和功能作用。我们使用免疫荧光分析了人类肌肉活检标本中 Mi-2 的表达。然后,我们使用心脏毒素(CTX)诱导小鼠肌肉损伤和修复;在该模型中通过免疫荧光和免疫印迹分析研究了肌肉再生过程中 Mi-2 的表达。最后,我们利用肌肉分化的细胞培养系统在成肌细胞增殖和分化过程中人为调节 Mi-2 水平。在 DM 肌肉中,Mi-2 表达增加优先出现在受束周萎缩影响的束内肌纤维中,特别是在表达再生标记物的小束周肌纤维的中央核中。在小鼠体内,Mi-2 在肌肉再生过程中显着且持续上调。体外用 RNAi 过早沉默 Mi-2 会导致成肌细胞分化加速。在小鼠模型的肌肉再生过程中,Mi-2 表达显着上调。它在表达再生标记物的 DM 肌纤维中也上调。体外研究表明,这种蛋白质可能在调节成肌细胞分化动力学中发挥作用。我们认为,DM 肌肉活检中 Mi-2 的高表达水平反映了不完全分化的肌肉细胞的存在。
Autoantibodies against the chromatin remodeler Mi-2 are found in a distinct subset of patients with dermatomyositis (DM). Previous quantitative immunoblotting experiments demonstrated that Mi-2 protein is up-regulated in DM muscle. We undertook this study to define the population of cells expressing high levels of Mi-2 in DM muscle and to explore the regulation and functional role of Mi-2 during muscle regeneration. We analyzed the expression of Mi-2 in human muscle biopsy specimens using immunofluorescence. Then, we used cardiotoxin (CTX) to induce muscle injury and repair in the mouse; Mi-2 expression during muscle regeneration was studied in this model by immunofluorescence and immunoblotting analysis. Finally, we utilized a cell culture system of muscle differentiation to artificially modulate Mi-2 levels during myoblast proliferation and differentiation. In DM muscle, increased Mi-2 expression is preferentially found in myofibers within fascicles affected by perifascicular atrophy, particularly in the centralized nuclei of small perifascicular muscle fibers expressing markers of regeneration. In the mouse, Mi-2 is dramatically and persistently up-regulated during muscle regeneration in vivo. Premature silencing of Mi-2 with RNAi in vitro resulted in accelerated myoblast differentiation. Mi-2 expression is markedly up-regulated during muscle regeneration in the mouse model. It is also up-regulated in DM myofibers expressing markers of regeneration. In vitro studies suggest that this protein may play a role in modulating the kinetics of myoblast differentiation. We propose that high levels of Mi-2 expression in DM muscle biopsies reflect the presence of incompletely differentiated muscle cells.
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发表时间: 1976-01-01
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影响因子: --
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