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The epicardium is required for sarcomeric maturation and cardiomyocyte growth in the ventricular compact layer mediated by TGFβ and FGF before the onset of coronary circulation.
MedLine Citation:
PMID:  24666202     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The epicardium, which is derived from the proepicardial organ (PE) as the third epithelial layer of the developing heart, is crucial for ventricular morphogenesis. An epicardial deficiency leads to a thin compact layer for the developing ventricle; however, the mechanisms leading to the impaired development of the compact layer are not well understood. Using chick embryonic hearts, we produced epicardium-deficient hearts by surgical ablation or blockade of the migration of PE and examined the mechanisms underlying a thin compact myocardium. Sarcomeric maturation (distance between Z-lines) and cardiomyocyte growth (size) were affected in the thin compact myocardium of epicardium-deficient ventricles, in which the amounts of phospho-smad2 and phospho-ERK as well as expression of TGFβ2 and FGF2 were reduced. TGFβ and FGF were required for the maturation of sarcomeres and growth of cardiomyocytes in cultured ventricles. In ovo co-transfection of dominant negative (dN)-Alk5 (dN-TGFβ receptor I) and dN-FGF receptor 1 to ventricles caused a thin compact myocardium. Our results suggest that immature sarcomeres and small cardiomyocytes are the causative architectures of an epicardium-deficient thin compact layer and also that epicardium-dependent signaling mediated by TGFβ and FGF plays a role in the development of the ventricular compact layer before the onset of coronary circulation.
Authors:
Makiko Takahashi; Toshiyuki Yamagishi; Mayu Narematsu; Tatsuya Kamimura; Masatake Kai; Yuji Nakajima
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-1-13
Journal Detail:
Title:  Congenital anomalies     Volume:  -     ISSN:  1741-4520     ISO Abbreviation:  Congenit Anom (Kyoto)     Publication Date:  2014 Jan 
Date Detail:
Created Date:  2014-3-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306292     Medline TA:  Congenit Anom (Kyoto)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
This article is protected by copyright. All rights reserved.
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