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Pulmonary endoderm, second heart field and the morphogenesis of distal outflow tract in mouse embryonic heart
Author(s) -
Liang Shi,
Li HuiChao,
Wang YunXiu,
Wu ShanShan,
Cai YuJin,
Cui HuiLin,
Yang YanPing,
Ya Jing
Publication year - 2014
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/dgd.12129
Subject(s) - endoderm , biology , foregut , morphogenesis , mesoderm , sonic hedgehog , microbiology and biotechnology , heart development , histogenesis , embryogenesis , anatomy , medicine , embryonic stem cell , embryo , immunology , signal transduction , immunohistochemistry , genetics , gene
The second heart field ( SHF ), foregut endoderm and sonic hedgehog ( SHH ) signaling pathway are all reported to associate with normal morphogenesis and septation of outflow tract ( OFT ). However, the morphological relationships of the development of foregut endoderm and expression of SHH signaling pathway members with the development of surrounding SHF and OFT are seldom described. In this study, serial sections of mouse embryos from ED 9 to ED 13 (midgestation) were stained with a series of marker antibodies for specifically highlighting SHF (Isl‐1), endoderm (Foxa2), basement membrane (Laminin), myocardium ( MHC ) and smooth muscle ( α ‐ SMA ) respectively, or SHH receptors antibodies including patched1 (Ptc1), patched2 (Ptc2) and smoothened, to observe the spatiotemporal relationship between them and their contributions to OFT morphogenesis. Our results demonstrated that the development of an Isl‐1 positive field in the splanchnic mesoderm ventral to foregut, a subset of SHF , is closely coupled with pulmonary endoderm or tracheal groove, the Isl‐1 positive cells surrounding pulmonary endoderm are distributed in a special cone‐shaped pattern and take part in the formation of the lateral walls of the intrapericardial aorta and pulmonary trunk and the transient aortic‐pulmonary septum, and Ptc1 and Ptc2 are exclusively expressed in pulmonary endoderm during this Isl‐l positive field development, suggesting special roles played in inducing the Isl‐l positive field formation by pulmonary endoderm. It is indicated that pulmonary endoderm plays a role in the development and specification of SHF in midgestation, and that pulmonary endoderm‐associated Isl‐l positive field is involved in patterning the morphogenesis and septation of the intrapericardial arterial trunks.