Multiple essential roles for primary cilia in heart development

Cilia

Kerry L Tucker²  Humphrey A R Gardner¹  Karin Gorgas²  Marc August Willaredt² 

[1] AstraZeneca, 35 Gatehouse Drive, Waltham, Massachusetts, 02451, U.S.A;Institute of Anatomy and Cell Biology, University of Heidelberg, Im Neuenheimer Feld 307, Heidelberg 69120, Germany

关键词: Cardiac neural crest;    Shh;    Bmp4;    Bmp2;    Alpha-actinin;    Hand1;    Isl1;    Pitx2c;    Nkx2.5;    AVSD;    Endocardial cushions;    Pulmonary trunk;    Aorta;    Outflow tract;    Heart;    Primary cilia;   

Others  :  791902
DOI  :  10.1186/2046-2530-1-23

 received in 2012-06-14, accepted in 2012-10-18,  发布年份 2012

【 摘 要 】

Background

The primary cilium is a microtubule-based, plasma membrane-ensheathed protrusion projecting from the basal bodies of almost all cell types in the mammalian body. In the past several years a plethora of papers has indicated a crucial role for primary cilia in the development of a wide variety of organs. We have investigated heart development in cobblestone, a hypomorphic allele of the gene encoding the intraflagellar transport protein Ift88, and uncovered a number of the most common congenital heart defects seen in newborn humans.

Methods

We generated serial sections of mutant cobblestone and wild type embryos in the region encompassing the heart and the cardiac outflow tract. The sections were further processed to generate three-dimensional reconstructions of these structures, and immunofluorescence confocal microscopy, transmission electron microscopy, and in situ hybridization were used to examine signal transduction pathways in the relevant areas. Whole mount in situ hybridization was also employed for certain developmental markers.

Results

In addition to an enlarged pericardium and failure of both ventricular and atrial septum formation, the cobblestone mutants displayed manifold defects in outflow tract formation, including persistent truncus arteriosus, an overriding aorta, and abnormal transformation of the aortic arches. To discern the basis of these anomalies we examined both the maintenance of primary cilia as well as endogenous and migratory embryonic cell populations that contribute to the outflow tract and atrioventricular septa. The colonization of the embryonic heart by cardiac neural crest occurred normally in the cobblestone mutant, as did the expression of Sonic hedgehog. However, with the loss of primary cilia in the mutant hearts, there was a loss of both downstream Sonic hedgehog signaling and of Islet 1 expression in the second heart field, a derivative of the pharyngeal mesoderm. In addition, defects were recorded in development of atrial laterality and ventricular myocardiogenesis. Finally, we observed a reduction in expression of Bmp4 in the outflow tract, and complete loss of expression of both Bmp2 and Bmp4 in the atrioventricular endocardial cushions. Loss of BMP2/4 signaling may result in the observed proliferative defect in the endocardial cushions, which give rise to both the atrioventricular septa as well as to the septation of the outflow tract.

Conclusions

Taken together, our results potentially identify a novel link between Sonic hedgehog signaling at the primary cilium and BMP-dependent effects upon cardiogenesis. Our data further point to a potential linkage of atrioventricular septal defects, the most common congenital heart defects, to genes of the transport machinery or basal body of the cilia.

【 授权许可】

   
2012 Willaredt et al.; licensee BioMed Central Ltd.

【 图 表 】

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