Calcineurin plays a modulatory role in loading-induced regulation of type I myosin heavy chain gene expression in slow skeletal muscle.
Calcineurin plays a modulatory role in loading-induced regulation of type I myosin heavy chain gene expression in slow skeletal muscle.
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钙调神经磷酸酶在慢骨骼肌中负载诱导的 I 型肌球蛋白重链基因表达调节中发挥调节作用。
DOI:
10.1152/ajpregu.00349.2009
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Haddad,Fadia
中科院分区:
文献类型:
--
作者:
Pandorf,ClayE;Jiang,WeihuaH;Qin,AnqiX;Bodell,PaulW;Baldwin,KennethM;Haddad,Fadia
The role of calcineurin (Cn) in skeletal muscle fiber-type expression has been a subject of great interest because of reports indicating that it controls the slow muscle phenotype. To delineate the role of Cn in phenotype remodeling, particularly its role in driving expression of the type I myosin heavy chain (MHC) gene, we used a novel strategy whereby a profound transition from fast to slow fiber type is induced and examined in the absence and presence of cyclosporin A (CsA), a Cn inhibitor. To induce the fast-to-slow transition, we first subjected rats to 7 days of hindlimb suspension (HS) + thyroid hormone [triiodothyronine (T3)] to suppress nearly all expression of type I MHC mRNA in the soleus muscle. HS + T3was then withdrawn, and rats resumed normal ambulation and thyroid state, during which vehicle or CsA (30 mg·kg−1·day−1) was administered for 7 or 14 days. The findings demonstrate that, despite significant inhibition of Cn, pre-mRNA, mRNA, and protein abundance of type I MHC increased markedly during reloading relative to HS + T3(P< 0.05). Type I MHC expression was, however, attenuated by CsA compared with vehicle treatment. In addition, type IIa and IIx MHC pre-mRNA, mRNA, and relative protein levels were increased in Cn-treated compared with vehicle-treated rats. These findings indicate that Cn has a modulatory role in MHC transcription, rather than a role as a primary regulator of slow MHC gene expression.
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DOI:
10.1152/ajpendo.00173.2007
发表时间:
2008
期刊:
American journal of physiology. Endocrinology and metabolism
影响因子:
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作者:
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DOI:
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Journal of applied physiology (Bethesda, Md. : 1985)
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DOI:
--
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2000
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DOI:
10.1152/ajpcell.2000.279.4.c915
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2000-10-01
影响因子:
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