The development of melanopsin-containing retinal ganglion cells in mice with early retinal degeneration
| Autor: | Linda Ruggiero, R. Lane Brown, Charles N. Allen, David W. Robinson |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Male
Retinal Ganglion Cells Retinal degeneration Melanopsin genetic structures Neurogenesis Apoptosis Giant retinal ganglion cells Biology Retinal ganglion Retina Article Mice medicine Animals Photopigment Cell Shape Suprachiasmatic nucleus General Neuroscience Retinal Degeneration Intrinsically photosensitive retinal ganglion cells Rod Opsins Cell Differentiation Dendrites medicine.disease Circadian Rhythm Disease Models Animal medicine.anatomical_structure Animals Newborn Nerve Degeneration Mice Inbred CBA sense organs Neuroscience Photoreceptor Cells Vertebrate |
| Zdroj: | European Journal of Neuroscience. 29:359-367 |
| ISSN: | 1460-9568 0953-816X |
| DOI: | 10.1111/j.1460-9568.2008.06589.x |
| Popis: | In mammals, the neuronal pathways by which rod and cone photoreceptors mediate vision have been well documented. The roles that classical photoreceptors play in photoentrainment, however, have been less clear. In mammals, intrinsically photosensitive retinal ganglion cells (ipRGCs) that express the photopigment melanopsin project directly to the suprachiasmatic nucleus (SCN) of the hypothalamus, the site of the circadian clock, and thereby contribute to non-image forming responses to light. Classical photoreceptors are not necessary for photoentrainment since loss of rods and cones does not eliminate light entrainment. Conflicting evidence arose, however, when attenuated phase-shifting responses were observed in the retinal degenerate CBA/J mouse. In this study, we examined the time course of retinal degeneration in CBA/J mice and used these animals to determine if maturation of the outer retina regulates the morphology, number and distribution of ipRGCs. We also examined whether degeneration during the early development of the outer retina can alter the function of the adult circadian system. We report that dendritic stratification and distribution of ipRGCs was unaltered in mice with early retinal degeneration, suggesting that normal development of the outer retina was not necessary for these processes. We found, however, that adult CBA/J mice have greater numbers of ipRGCs than controls, implicating a role for the outer retinal photoreceptors in regulating developmental cell death of ipRGCs. |
| Databáze: | OpenAIRE |
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