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Cardiac Neural Crest Cells: Their Rhombomeric Specification, Migration, and Association with Heart and Great Vessel Anomalies

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Abstract

Outflow tract abnormalities are the most frequent congenital heart defects. These are due to the absence or dysfunction of the two main cell types, i.e., neural crest cells and secondary heart field cells that migrate in opposite directions at the same stage of development. These cells directly govern aortic arch patterning and development, ascending aorta dilatation, semi-valvular and coronary artery development, aortopulmonary septation abnormalities, persistence of the ductus arteriosus, trunk and proximal pulmonary arteries, sub-valvular conal ventricular septal/rotational defects, and non-compaction of the left ventricle. In some cases, depending on the functional defects of these cells, additional malformations are found in the expected spatial migratory area of the cells, namely in the pharyngeal arch derivatives and cervico-facial structures. Associated non-cardiovascular anomalies are often underestimated, since the multipotency and functional alteration of these cells can result in the modification of multiple neural, epidermal, and cervical structures at different levels. In most cases, patients do not display the full phenotype of abnormalities, but congenital cardiac defects involving the ventricular outflow tract, ascending aorta, aortic arch and supra-aortic trunks should be considered as markers for possible impaired function of these cells. Neural crest cells should not be considered as a unique cell population but on the basis of their cervical rhombomere origins R3-R5 or R6-R7-R8 and specific migration patterns: R3-R4 towards arch II, R5-R6 arch III and R7-R8 arch IV and VI. A better understanding of their development may lead to the discovery of unknown associated abnormalities, thereby enabling potential improvements to be made to the therapeutic approach.

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Fig. 1

Source: original figure). Left posterolateral view of human developing embryo at embryonic day 29, corresponding to Carnegie stage CS11. Migration of neural crest cells in humans occurs from the neural crest to the cardiovascular structure, between Carnegie stages 10–13 for a 4-week period. At this time, the brain (in blue) is composed of 3 continuous structures: prosencephalon (Forebrain—PE), mesencephalon (Midbrain—ME), rhombencephalon (Hindbrain—RE). The neural crest (in green) comprises two longitudinal structures that develop bilaterally on the dorsal-lateral part of all neural structures at day 25 (CS9). Cardiac neural crests are derived from cervical neural crest cells that are located between the cranial neural crest cells and the trunk neural crest cells. The majority of NCCc come from R6-R7-R8 with a spatial postotic vesicle (OV) migration: NCCc from R6 through arch III, NCCc from R7 and R8 through arch IV and then through VI when developed. Recent studies have shown that NCC from more proximal rhombomers R3 and R4 (i.e., with preotic vesicle migration) migrate through arches II towards the heart. NCC from R5 have a specific intracrest migration to R4 and R6 and become NCCc at respective rhombomeres. RV right ventricle, LV left ventricle, BC Bulbus cordis, PA1-4 pharyngeal arch 1–4, OV otic vesicle

Fig. 2

Source: Figure from Simoes-Costa (Simoes-Costa et al. 2014)]. Neural crest cells are generated in the ectodermal germ layer during gastrulation and initially reside in two neural plate border territories, which are located at the two lateral edges of the central nervous system in contact with the ectodermal epidermis (a). During neurulation, these border territories approach one another along the dorsal line (b) when the neural plate closes to form the neural tube (c). After neural tube closure, the NCC leave the central nervous system (i.e., delamination) via an epithelial to mesenchymal transition (EMT) that is accompanied by an alteration of cell contact with neural plate cells and enhanced migration capability (d)

Fig. 3

Source: Figure adapted from M. Simoes-Costa (Simoes-Costa et al. 2014) and D. Meulenans (Meulemans and Bronner-Fraser 2004)] giving special consideration to cardiac Neural crest cells (NCCc). The initiation of neural crest genes in the lateral part of neural plate cells is induced by the presence of high levels of FGF and NOTCH and intermediate levels of BMP and Wnt signaling. The FGF and Wnt are secreted by lateral structures [i.e., epidermis (gray box)] and induce epidermal differentiation, while their inhibitors are secreted by medial structures such as the neural plate (blue box). The intermediate gradient of BMP and Wnt between neural cells and epidermal cells may explain the appearance of neural crest cells (green box). In the non-neural ectoderm, a high level of BMP activates the epidermal program. During neural crest induction, there is firstly the amplification of a set of transcription factors that initiate and maintain the neural plate border zone. These are referred to as neural plate border specifier transcription factors (b). The activation of this module of transcription factors leads to the activation of a new set of transcription factors (i.e., the neural crest specifier module) (c) that further determines the unique capabilities of these cells while maintaining their multipotency and characteristics of the neural crest. Activation of the neural crest specifier module leads to activation of Epithelial-Mesenchymal-Transdifferentiation (EMT) that is crucial for cell delamination and acquisition of mesenchymal phenotype. The neural crest specifier module also activates a new set of transcription factors (i.e., Neural crest migration specifiers) that is necessary for cell migration and maintenance of multipotency during migration (d). Ets1 and Sox9 (yellow star) are crucial regulators of the migratory module of the cranial neural crest for the establishment of cranial crest cephalic identity and for mediating mass delamination from the neural tube resulting in the wave-like migration pattern. The expression of neural specifier genes such as FoxD3, Ets1 and Sox9/10 is maintained in all migrating NCCc. Furthermore, there is a positive loop for Sox, especially Sox9, in migrating NCCc. Cardiac neural stem cell multipotency is already determined at the time of cell “egression” from the neural tube

Fig. 4

Source: original figure). Anteroposterior crosssection through developing right ventricle/bulbus cordis/aortic sac at human embryonic day 32 (CS14). (A1) Enlargement view. Cardiac neural crest cells (in green) are attracted to the right ventricle outflow tract by SHCc that are initially present at this location (blue) and that will pattern all outflow track development. In chicken, and possibly mice, R8 (and possibly R7) anomalies are associated with aortopulmonary septation. This observation needs confirmation in humans. The NCCc migrate through the newly developed right and left arches of VI, which fuse on the midline to form the pulmonary trunk and participate in aortopulmonary septation. The direction of migration of NCCc in the outflow track is determined by a direct physical interaction with the posterior mesodermal flow divider (PMFD), which is a mesodermal structure that develops in the wall of the posterior part of the proximal developing right ventricle. The posterior migrating contingent of secondary heart field cells (blue arrow 2) provides an important cellular component for this structure as well as the valvular intercalated cushions (ICC). The interaction of PMFD has two main effects on the migration of cardiac neural crest cells: 1) by dividing and directing their flow towards the anterior and posterior conotruncal cushions (CTC), thus enabling their fusion, 2) by provoking a 90° rotation of the outflow tract (purple arrow). This rotation helps in the closure of the sub-valvular conal aortopulmonary septum, by narrowing the ventricle part of the conotruncal cushions, and in the fusion with the developing atrioventricular cushion. PMFD posterior mesodermal neural crest cell flow divider, VI-R or VI-L right or left VI arterial arches, RV right ventricle, LV left ventricle, migration of secondary heart field cells: (1) anterior or (2) posterior, CTC conotruncal cushions (ant/post), ICC intercalated cardiac cushions (right/left)

Fig. 5

Source: original figure). Cross-section at level of endocardial cushions in the outflow tract at human embryonic day 32. The aortic (AV) and pulmonary (PV) valves develop from embryonic days 26–41 from 4 cushions: two lateral intercalated cushions (ICC) (yellow) with local restricted development in the outflow tract, and two anterior and posterior conotruncal cushions (CTC) s(brown). The endothelium monolayer covering the endoluminal surface of the outflow track is represented by a continuous green line. CTC are derived from local transdifferentiation of endothelial to mesenchymal differentiation, while ICC are mesodermal structure derivatives with an additional important contingent coming from secondary heart field cells (yellow circles). Migration of NCCc (green circles) provokes the fusion of anterior and posterior CTC on the midline, which is then followed by fusion between different formations on each side (large blue arrows). Then the partition and maturation of the valve occurs to form fine, stratified and mature tricuspid aortic and pulmonary valves. In chicken, arterial outflow tract valves are derived from cells originating from rhombomeres R6, R7 and R8 (Etchevers et al. 2001). Absence of fusion will give rise to a persistent arterial trunk, which is the genetic abnormality most commonly related to neural crest ablation abnormalities. Preotic NCCc (green rectangles) from R3-R4, as described in quail and mice, have a predominant distribution for CTC cushions, the coronaries, conotruncal and septal regions. ICC-R/ICC-L right or left intercalated cushion, CTC-ant/post: medial conotruncal cushion anterior or posterior, AV future tricuspid aortic valve, PV future tricuspid pulmonary valve

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OS and LG contributed equally to this work.

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Correspondence to Olivier Schussler.

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Schussler, O., Gharibeh, L., Mootoosamy, P. et al. Cardiac Neural Crest Cells: Their Rhombomeric Specification, Migration, and Association with Heart and Great Vessel Anomalies. Cell Mol Neurobiol 41, 403–429 (2021). https://doi.org/10.1007/s10571-020-00863-w

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