TGF-β1-induced phospholamban expression alters esophageal smooth muscle cell contraction in patients with eosinophilic esophagitis.
TGF-β1-induced phospholamban expression alters esophageal smooth muscle cell contraction in patients with eosinophilic esophagitis.
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DOI:
10.1016/j.jaci.2014.04.004
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发表时间:
2014-11
影响因子:
14.2
通讯作者:
Aceves, Seema S.
中科院分区:
文献类型:
--
作者:
Beppu, Lisa Y.;Anilkumar, Arjun A.;Newbury, Robert O.;Dohil, Ranjan;Broide, David H.;Aceves, Seema S.
Eosinophilic esophagitis (EoE) is a chronic antigen mediated disease characterized by esophageal eosinophilia, remodeling, and fibrosis. TGFβ1 is a central regulator of EoE remodeling and increases esophageal smooth muscle cell contraction. In this study, we aimed to understand the molecular mechanisms by which TGFβ1 could induce esophageal smooth muscle cell contraction. We used primary human esophageal smooth muscle (ESM) cells and EoE myofibroblasts (EMF) to assess the mechanisms of TGFβ1-induced contraction. We analyzed the expression, phosphorylation, and function of phospholamban (PLN), a sarcoendoplasmic reticulum regulatory protein which was induced by TGFβ1. Expression of PLN, phospho-PLN, and its regulatory pathway was analyzed in the esophageal smooth muscle of EoE and control biopsies. Gene silencing in EoE EMFs was utilized to understand the role of PLN in contraction. TGFβ1 induced and phosphorylated PLN in primary human ESM and EoE EMFs. PLN and phospho-PLN were elevated in EoE as compared to control subject smooth muscle in vivo. PLN inhibition significantly diminished TGFβ1 induced EoE EMF contraction. PLN expression and ESM/EMF contraction depended on TGFβ receptor I signals. We describe a previously unrecognized mechanism for esophageal smooth muscle cell contraction that depends on TGFβ1, its receptors, and PLN. Since PLN is elevated in EoE smooth muscle and PLN silencing diminishes contraction, we provide a novel potential mechanistic framework and therapeutic target for esophageal smooth muscle dysfunction in EoE.
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