Abstract
Astrocytes have been considered to be transformed from radial glial cells that appear at early stage of development and play a scaffold-role for neuronal cell migration. Recent studies indicate that neuroepithelial cells in the spinal cord also give rise to astrocytes. However, the mode of astroglial generation and migration in the ventricular neuroepithelium remains poorly understood. In this study, we have utilized immunohistochemical and retroviral lineage tracing methods to characterize the developmental profiles of astrocytes in the chick optic tectum, which develops from both the neural tube and invasion of optic tract. Chick vimentin and glial fibrillary acidic protein (GFAP) were found as single bands at molecular weights consistent with those reported for mammalian species. Differential developmental trends were observed for both proteins with relative vimentin levels decreasing and GFAP levels increasing with embryonic age. We observed two streams of tectal GFAP-labeled astrocytes originated from the tectal ventricle (intrinsic origin) and the optic tract (extrinsic origin). The extrinsic astrocytes arose from the ventral neuroepithelium of the third ventricle, dispersed bilaterally to the optic tract, and subsequently to the outer layer of optic tectum, indicating migration of astrocytes along retinal ganglion cell axons. On the other hand, the intrinsic astrocytes from the tectal ventricular neuroepithelium appeared first in the ventral part of the optic tectum, and then in the lateral and dorsal tectum. The intrinsic tectal astrocytes closely associated with fascicles of vimentin-labeled radial glial cells, indicating a presumptive radial migration of astrocytes. These results demonstrated that the optic tectum contains heterogeneous populations of astrocytes developed from the different origins and routes of migration.
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Acknowledgments
This work was supported by grant No. R01-2003-000-10478-0 from the Basic Research Program of the Korea Science & Engineering Foundation and by research grant of the Chungbuk National University in 2006. This study was also supported partially by the second stage Brain Korea 21 Project in 2007 and a grant (M103KV010018 04K2201 01850) from Brain Research Center of the 21st Century Frontier Research Program funded by the Ministry of Science and Technology, the Republic of Korea.
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J.H. Seo and J.H. Chang contributed equally to this work.
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Seo, J.H., Chang, J.H., Song, S.H. et al. Spatiotemporal Gradient of Astrocyte Development in the Chick Optic Tectum: Evidence for Multiple Origins and Migratory Paths of Astrocytes. Neurochem Res 33, 1346–1355 (2008). https://doi.org/10.1007/s11064-008-9590-3
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DOI: https://doi.org/10.1007/s11064-008-9590-3