Peripheral and Central Target Requirements for Survival of Embryonic Rat Dorsal Root Ganglion Neurons in Slice Cultures
| Autor: | James E. Vaughn, Richard Wetts |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Nervous system
Programmed cell death Pathology medicine.medical_specialty Cell Survival DNA Fragmentation Biology Article Rats Sprague-Dawley Embryonic and Fetal Development Organ Culture Techniques Neurotrophin 3 Dorsal root ganglion DNA Nucleotidylexotransferase In vivo Ganglia Spinal medicine Animals Nerve Growth Factors Neurons TUNEL assay Histocytochemistry General Neuroscience Embryo Embryo Mammalian Spinal cord Embryonic stem cell Rats medicine.anatomical_structure nervous system Deoxyuracil Nucleotides Neuroscience |
| Zdroj: | The Journal of Neuroscience. 18:6905-6913 |
| ISSN: | 1529-2401 0270-6474 |
| DOI: | 10.1523/jneurosci.18-17-06905.1998 |
| Popis: | Developmental cell death in the nervous system usually is controlled by the availability of target-derived trophic factors. It is well established that dorsal root ganglia (DRG) neurons require the presence of their peripheral target for survival, but because of their central projections, it is possible that the spinal cord also may be required. Before examining this possibility in rat embryos, we first used terminal deoxynucleotidyl transferase-mediated biotinylated UTP nick end labeling (TUNEL) to determine that thoracic DRG cell death occurred from embryonic day 15 (E15) to E18. To determine the target requirements of DRG neurons, we used organotypic slice cultures of E15 thoracic trunk segments. After peripheral target removal, essentially all DRG neurons disappeared within 5 d. In contrast, after removal of the spinal cord, approximately half of the DRG neurons survived for at least 8 d. Hence, some E15 DRG neurons could survive without the spinal cord. However, those DRG neurons that died after spinal cord ablation apparently required trophic factors from both central and peripheral targets, because the presence of only one of these tissues was not adequate by itself to support this cell group. Addition of neurotrophin-3 (NT-3) to the culture medium rescued some DRG neurons after CNS removal, suggesting a possible role for NT-3 in vivo. In other experiments, cultures were established from older (E16) embryos, and essentially all neurons survived after spinal cord ablation, even without added factors. These and other experiments indicated that approximately 65% of DRG neurons are transiently dependent on the CNS early in development. |
| Databáze: | OpenAIRE |
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