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Ultrastructure of cell death in bulbar cushions of chick embryo heart

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Summary

The ultrastructure of the “physiological” cell death was studied in distal ventral bulbar cushions of 15 chick embryo hearts on the 4th and 5th day of incubation. Microperfusion fixation was performed. The ultracytochemistry of a lysosomal hydrolytic enzyme acid phosphatase was also investigated in another 15 embryonic hearts.

In the course of the cell degeneration an increase in cellulr autophagy was observed without previous cytoplasmic or nuclear changes or phagocyte ingestion. A cytoplasmic diffusion of acid phosphatase outside of lysosomes was observed.

Besides the cell death with the marked participation of the lysosomal system, another kind of dying cells was found, characterized by their nuclear pycnosis and cytoplasmic condensation. Starting from the 5th day of incubation the dying and dead cells were found phagocytized by some of their neighbouring viable mesenchymal cells. A formation of ribosomal crystals was not observed.

The formation and fate of cytolysomes as well as the fate of phagocytes are discussed. The presence of pre-necrotic cells with important autophagy and of necrotic cells with nuclear changes was related to the possibility of a dual cause of the cell death. In the case of pre-necrotic cells the epigenetic factors like the biomechanic action of hemodynamics were considered, while the necrotic cells seem to be programmed to death by their genome.

Finally the uniformity of cell death ultrastructure in different organs and species was noticed.

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  1. Institute of Histology and Embryology, University of Lausanne, Switzerland

    Radivoj Krstić & Tomas Pexieder

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  1. Radivoj Krstić
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Krstić, R., Pexieder, T. Ultrastructure of cell death in bulbar cushions of chick embryo heart. Z. Anat. Entwickl. Gesch. 140, 337–350 (1973). https://doi.org/10.1007/BF00525060

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