PUBLICATION
A novel model of retinal ablation demonstrates that the extent of rod cell death regulates the origin of the regenerated zebrafish rod photoreceptors
- Authors
- Montgomery, J.E., Parsons, M.J., and Hyde, D.R.
- ID
- ZDB-PUB-100112-25
- Date
- 2010
- Source
- The Journal of comparative neurology 518(6): 800-814 (Journal)
- Registered Authors
- Hyde, David R., Montgomery, Jacob, Parsons, Michael
- Keywords
- nitroreductase, metronidazole, Müller glia, neuronal progenitor cell, rod precursor cell, retinal regeneration, Müller glia, stem cell, nfsB
- MeSH Terms
-
- Models, Neurological
- Neurotoxins/toxicity
- In Vitro Techniques
- Retina/drug effects
- Retina/injuries*
- Retina/physiopathology*
- Zebrafish/physiology*
- Escherichia coli Proteins/genetics
- Cell Proliferation
- Metronidazole/toxicity
- Animals, Genetically Modified
- Retinal Rod Photoreceptor Cells/drug effects
- Retinal Rod Photoreceptor Cells/physiology*
- Nerve Regeneration/drug effects
- Nerve Regeneration/physiology*
- Nitroreductases/genetics
- Neuroglia/drug effects
- Neuroglia/physiology
- Cell Death/drug effects
- Cell Death/physiology
- Apoptosis/drug effects
- Apoptosis/physiology
- Animals
- Green Fluorescent Proteins/genetics
- Stem Cells/drug effects
- Stem Cells/physiology*
- PubMed
- 20058308 Full text @ J. Comp. Neurol.
Citation
Montgomery, J.E., Parsons, M.J., and Hyde, D.R. (2010) A novel model of retinal ablation demonstrates that the extent of rod cell death regulates the origin of the regenerated zebrafish rod photoreceptors. The Journal of comparative neurology. 518(6):800-814.
Abstract
The adult zebrafish retina continuously produces rod photoreceptors from infrequent Müller glial cell division, yielding neuronal progenitor cells that migrate to the outer nuclear layer and become rod precursor cells that are committed to differentiate into rods. Retinal damage models suggested that rod cell death induces regeneration from rod precursor cells, whereas loss of any other retinal neurons activates Müller glia proliferation to produce pluripotent neuronal progenitors that can generate any other neuronal cell type in the retina. We tested this hypothesis by creating two transgenic lines that expressed the E. coli nitroreductase enzyme fused to EGFP (NTR-EGFP) in only rods. Treating transgenic adults with metronidazole resulted in two rod cell death models. First, killing all rods throughout the Tg(zop:nfsB-EGFP)(nt19) retina induced robust Müller glial proliferation, which yielded clusters of neuronal progenitor cells. In contrast, ablating only a subset of rods across the Tg(zop:nfsB-EGFP)(nt20) retina led to rod precursor, but not Müller glial, cell proliferation. We propose that two different criteria determine whether rod cell death will induce a regenerative response from the Müller glia rather than from the resident rod precursor cells in the ONL. First, there must be a large amount of rod cell death to initiate Müller glia proliferation. Second, the rod cell death must be acute, rather than chronic, to stimulate regeneration from the Müller glia. This suggests that the zebrafish retina possesses mechanisms to quantify the amount and timing of rod cell death.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping