Abstract
The aim of this study was to clarify the mechanism of apoptosis seen in the cortex of neural cell-specific hypoxia inducible factor-1α (HIF-1α)-deficient embryos. A previous study showed that the neural cells in the cortical area of the mutant embryos underwent apoptosis coincident with vascular regression. Through histological, immunohistochemical, and electron microscopic technique, two kinds of apoptotic cells were detected in the mutant embryonal cortex. Apoptotic cells of one type were clustered in small round structures, 10–20 μm in diameter, whereas the others, present in large numbers, were distributed in a group at the cortical plate located more to the outer side than the round structures. The histochemical and electron microscopic findings indicate that the former represented the appearance of macrophages, in which cellular fragments including vascular cells underwent oxidative stress-related, TNF receptor-mediated, caspase-2-induced apoptosis, while the latter showed c-Myc-related, caspase-3-activated apoptosis of the neural cells. These results suggest that two pathways of apoptosis are induced in neuronal and vascular cells of the cortex in the neural cell-specific HIF-1α-deficient mouse.
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Acknowledgements
The authors wish to express their appreciation to Dr. S. Adachi, Kyoto University, for critical comments, Dr. T. Nakagawa, Mr. H. Miyanaka, Ms. C. Ishikawa, and Ms. S. Fuke, Kagawa University, for technical assistance and Ms. Y. Fujiwara and Ms. A. Kimura, for editorial assistance. This research was supported by a grant-in-aid for encouragement of young scientists (15790171) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. We have no conflict of interest.
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Ueno, M., Tomita, S., Ueki, M. et al. Two pathways of apoptosis are simultaneously induced in the embryonal brains of neural cell-specific HIF-1α-deficient mice. Histochem Cell Biol 125, 535–544 (2006). https://doi.org/10.1007/s00418-005-0101-1
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DOI: https://doi.org/10.1007/s00418-005-0101-1