Related Experiment Videos
Effect of targeted expression of clusterin in photoreceptor cells on retinal development and differentiation
C Jomary1, G Chatelain, D Michel
1British Retinitis Pigmentosa Society Laboratory, Department of Pharmacology, The Rayne Institute, GKT, St Thomas' Hospital, London SE1 7EH, UK. cjomary@hgmp.mrc.ac.uk
Abstract:
Clusterin expression is increased in tissues undergoing apoptosis, including neurodegenerative retina, but the causal relationships remain to be clarified. To test the hypothesis that overexpression of clusterin could induce apoptosis in neurons, transgenic mice were generated in which rat clusterin transgene was expressed in photoreceptor cells under the transcriptional control of the human interphotoreceptor retinoid-binding protein (IRBP) promoter. Photoreceptor cell death in the resulting transgenic mice was examined by histology and TUNEL techniques. The expression of the clusterin transgene was confirmed by in situ hybridization in the photoreceptor cells, and results in a complex pattern of clusterin protein distribution in the retina. A reduction in apoptotic staining in the transgenic retinas was observed from birth to postnatal day 15. These results suggest that clusterin is not causally involved in apoptotic mechanisms of photoreceptor cell death, but may relate to cytoprotective functions.
Insights
Clusterin does not cause photoreceptor cell death in transgenic mice. Instead, clusterin may play a protective role in the retina, contrary to initial hypotheses.
Area of Science:
- Neuroscience
- Ophthalmology
- Molecular Biology
Background:
- Clusterin expression elevates in apoptotic tissues, including the neurodegenerative retina.
- The precise role of clusterin in neuronal apoptosis remains unclear.
Purpose of the Study:
- To investigate if clusterin overexpression induces apoptosis in photoreceptor cells.
- To determine the causal relationship between clusterin and photoreceptor cell death.
Main Methods:
- Generated transgenic mice with rat clusterin transgene expression in photoreceptor cells under the IRBP promoter.
- Analyzed photoreceptor cell death using histology and TUNEL assays.
- Confirmed transgene expression via in situ hybridization.
Main Results:
- Clusterin transgene expression exhibited a complex protein distribution pattern in the retina.
- Transgenic retinas showed reduced apoptotic staining from birth to postnatal day 15.
- Photoreceptor cell death was not induced by clusterin overexpression.
Conclusions:
- Clusterin is not causally linked to apoptotic mechanisms in photoreceptor cell death.
- Findings suggest clusterin may possess cytoprotective functions in the retina.