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- W2047987857 abstract "We investigated potential early asymmetries in the distribution of mesenchymal cells within the inferior and superior AV cushions in the developing chick heart.Chick embryos stages 16-20 HH were fixed, embedded in polyacrylamide, and the cell nuclei stained with propidium iodide. Cells counts were determined within the cardiac jelly of the atrioventricular canal (AV) by laser confocal microscopy in coronal planes spanning its entire length.Our data show at the different stages studied, 16-20 HH, that the inferior AV cushion invariably contains more cells than the superior AV cushion. In the inferior cushion, the cell distribution is bimodal, i.e., the proximal and distal regions have more mesenchymal cells than the middle part of the AV canal. In the superior cushion, there is a increasing gradient of mesenchymal cells along the longitudinal axis from the atrium to the ventricle.Our findings reveal that the temporal and spatial characteristics of mesenchyme formation in the inferior vs. superior AV cushion are different. This asymmetry suggests several potential hypotheses: (1) the distribution of the inducer molecule or its receptor has a distribution similar to that of mesenchymal cells, (2) the extracellular matrix has a differential composition or regionally-specific physical associations, (3) the endocardium is heterogeneous with respect to transformation capacity, or (4) these patterns result from an earlier inductive event. The potential importance of the observed asymmetries in the distribution of AV mesenchyme is discussed relative to localization patterns of molecules critical to successful cardiac morphogenesis and remodeling." @default.
- W2047987857 created "2016-06-24" @default.
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- W2047987857 date "1997-05-01" @default.
- W2047987857 modified "2023-10-17" @default.
- W2047987857 title "Temporal and spatial asymmetries in the initial distribution of mesenchyme cells in the atrioventricular canal cushions of the developing chick heart" @default.
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- W2047987857 doi "https://doi.org/10.1002/(sici)1097-0185(199705)248:1<84::aid-ar10>3.0.co;2-1" @default.
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