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
中科院分区:
文献类型:
--
作者:
Mammen, Andrew L.;Casciola-Rosen, Livia A.;Hall, John C.;Christopher-Stine, Lisa;Corse, Andrea M.;Rosen, Antony
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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DOI:
10.1016/0090-1229(76)90145-8
发表时间:
1976-01-01
期刊:
CLINICAL IMMUNOLOGY AND IMMUNOPATHOLOGY
影响因子:
--
作者:
REICHLIN, M;MATTIOLI, M
通讯作者:
MATTIOLI, M
影响因子:
2.8
作者:
Matsuura, Tetsuya;Li, Yong;Huard, Johnny
通讯作者:
Huard, Johnny
DOI:
10.1016/j.berh.2004.02.009
发表时间:
2004-06-01
影响因子:
5.2
作者:
Christopher-Stine, L;Plotz, PH
通讯作者:
Plotz, PH
影响因子:
--
作者:
Cooper, ST;Maxwell, AL;North, KN
通讯作者:
North, KN
影响因子:
--
作者:
TARGOFF, IN;REICHLIN, M
通讯作者:
REICHLIN, M