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The fate of somitocoele cells in avian embryos
Insights
Somitocoele cells in avian embryos primarily form ribs and intervertebral disc parts. A subpopulation also exhibits angiogenic potential, contributing to blood vessel formation and migrating into the neural tube.
Area of Science:
- Developmental biology
- Embryology
- Cell biology
Background:
- Early avian embryos feature somites composed of epithelial walls and somitocoele mesenchymal cells.
- Understanding the developmental fate and potential of these somitocoele cells is crucial for embryogenesis research.
Purpose of the Study:
- To trace the developmental trajectory of somitocoele cells in avian embryos.
- To investigate the contribution of somitocoele cells to skeletal and vascular structures.
- To assess the proliferative capacity and migratory behavior of these cells.
Main Methods:
- Quail-chick marker technique for cell lineage tracing.
- QH-1 antibody staining to identify hemangiopoietic cells.
- Bromodeoxyuridine (BrdU) incorporation assay to measure cell proliferation.
Main Results:
- Somitocoele cells predominantly differentiate into ribs and peripheral intervertebral disc components.
- A subset of somitocoele cells demonstrates angiogenic potential, forming endothelial cells that migrate actively.
- These endothelial cells were observed migrating into the neural tube.
- Somitocoele cells exhibit significant proliferative activity, with approximately 26% of nuclei showing BrdU labeling.
Conclusions:
- Somitocoele cells are key progenitors for axial skeletal elements and vascular development in avian embryos.
- The study highlights the multipotent nature of somitocoele mesenchymal cells, contributing to both skeletal and vascular lineages.
- The proliferative capacity and migratory behavior underscore their dynamic role during embryonic development.
Abstract:
The early somite of avian embryos is made up of an epithelial wall and mesenchymal cells located within the somitocoele. We have studied the fate of somitocoele cells for a period of up to 6 days, using the quail-chick marker technique. We also applied the QH-1 antibody, which specifically stains hemangiopoietic cells of quail origin, and studied the proliferative activity of epithelial somites with the BrdU anti-BrdU method. Our results show that somitocoele cells mainly give rise to the ribs and peripheral parts of the intervertebral discs. After 1 and 2 days of reincubation, the grafted somitocoele cells were located in the lateral part of the sclerotome, and only a few cells migrated axially towards the notochord. In frontal sections, the cells were located in a triangular area within the cranial part of the caudal sclerotome half. After 3 days of reincubation, some of the cells had migrated cranially along the myotome. After longer reincubation periods, cells grafted into one somite could be found in two adjacent ribs. The studies with the QH-1 antibody show that a subpopulation of somitocoele cells has angiogenic potency. Endothelial cells originating from the mesenchyme of the somitocoele migrated actively and even invaded the ipsilateral half of the neural tube. In the epithelial wall of the somite, BrdU-labelled nuclei were found basally, whereas more apically the nuclei were not stained, but mitotic figures were frequently present. The somitocoele cells also showed a high proliferative activity with about 26% of nuclei labelled with BrdU.