Related Experiment Video
Updated: May 27, 2026
Vibratome Sectioning Mouse Retina to Prepare Photoreceptor Cultures
Published on: December 22, 2014
Expression of p97/VCP and ubiquitin during postnatal development of the degenerating rat retina
Huseyin Ortak1, Sevil Cayli, Ufuk Tas
1Department of Ophthalmology, Faculty of Medicine, Gaziosmanpasa University, Tokat, Turkey. huseyin.ortak@hotmail.com
Insights
This study tracked ubiquitin and p97/VCP protein levels in developing rat retinas. Protein levels changed with age, suggesting a link between these proteins and age-related retinal degeneration.
Area of Science:
- Neuroscience
- Cell Biology
- Ophthalmology
Background:
- The ubiquitin-proteasome system and p97/VCP (valosin-containing protein) are crucial for protein homeostasis.
- Dysregulation of these pathways is implicated in various neurodegenerative diseases, including retinal degeneration.
- Understanding their role during retinal development is essential for identifying potential therapeutic targets.
Purpose of the Study:
- To investigate the spatiotemporal distribution of ubiquitin and p97/VCP in the rat retina during postnatal development.
- To determine the correlation between the expression patterns of ubiquitin and p97/VCP and age-related changes in the retina.
Main Methods:
- Immunohistochemistry was employed to examine retinal tissues from rats at various postnatal ages (1, 4, 10, 36, and 72 weeks).
- Immunofluorescence microscopy was utilized to assess protein colocalization.
- Quantitative analysis of protein expression patterns was performed.
Main Results:
- p97/VCP showed strong expression in early development, peaking at 10 weeks, and significantly decreased in older rats (36 and 72 weeks).
- Ubiquitin expression was minimal in young rats and markedly increased in older rats, particularly in the inner nuclear layer (INL), inner plexiform layer (IPL), ganglion cell layer (GCL), and photoreceptor inner segments (IS).
- Colocalization of ubiquitin and p97/VCP was observed in specific retinal layers of aged rats.
Conclusions:
- The expression patterns of p97/VCP and ubiquitin undergo significant alterations during rat retinal development and aging.
- The observed inverse relationship between p97/VCP and ubiquitin with age suggests their involvement in age-related retinal degeneration.
- These findings highlight the potential role of protein degradation pathways in maintaining retinal health and the mechanisms underlying age-related vision loss.
Abstract:
In this study, we aimed to investigate the distribution pattern of ubiquitin and p97/VCP in the rat retina during postnatal development. Eyeballs from 1-, 4-, 10-, 36- and 72-week-old rats were examined by immunohistochemistry, and protein colocalization was determined by immunofluorescence microscopy. In the 1-week-old rat retina, p97/VCP was strongly expressed in the neuroblast layer, however no ubiquitin immunoreactivity was observed. p97/VCP immunoreactivity was present in the ganglion cell layer (GCL), inner nuclear layer (INL), outer nuclear layer (ONL), inner segment (IS) of the photoreceptor layer, and retinal pigment epithelium in the 4- and 10-week-old rat retinas. p97/VCP immunoreactivity increased significantly in the 10-week-old rat retinas. Ubiquitin was barely seen in the 4-week-old rat retinas, and ubiquitin expression was weak in the GCL and the IPL of the 10-week-old rat retinas. In the 36- and 72-week-old rats, the presence of ubiquitin was remarkable in the IS, INL, IPL and GCL, however, p97/VCP immunoreactivity was significantly decreased. Colocalization of ubiquitin and p97/VCP was also observed in the INL, IS, GCL and ONL of 36- and 72-week-old rat retinas. Our results indicate that p97/VCP immunoreactivity in the retina significantly decreases after rats reach 10 weeks of age, whereas ubiquitin immunoreactivity increases with aging. These results suggest that an altered expression pattern of p97/VCP and ubiquitin in the developing rat retina may associate with age-related retinal degeneration.
