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Vibratome Sectioning Mouse Retina to Prepare Photoreceptor Cultures
Published on: December 22, 2014
Impacts of ciliary neurotrophic factor on the retinal transcriptome in a mouse model of photoreceptor degeneration
Yanjie Wang1, Kun-Do Rhee1, Matteo Pellegrini2
1Department of Ophthalmology and Stein Eye Institute, University of California, Los Angeles, CA, USA.
Abstract:
Ciliary neurotrophic factor (CNTF) has been tested in clinical trials for human retinal degeneration due to its potent neuroprotective effects in various animal models. To decipher CNTF-triggered molecular events in the degenerating retina, we performed high-throughput RNA sequencing analyses using the Rds/Prph2 (P216L) transgenic mouse as a preclinical model for retinitis pigmentosa. In the absence of CNTF treatment, transcriptome alterations were detected at the onset of rod degeneration compared with wild type mice, including reduction of key photoreceptor transcription factors Crx, Nrl, and rod phototransduction genes. Short-term CNTF treatments caused further declines of photoreceptor transcription factors accompanied by marked decreases of both rod- and cone-specific gene expression. In addition, CNTF triggered acute elevation of transcripts in the innate immune system and growth factor signaling. These immune responses were sustained after long-term CNTF exposures that also affected neuronal transmission and metabolism. Comparisons of transcriptomes also uncovered common pathways shared with other retinal degeneration models. Cross referencing bulk RNA-seq with single-cell RNA-seq data revealed the CNTF responsive cell types, including Müller glia, rod and cone photoreceptors, and bipolar cells. Together, these results demonstrate the influence of exogenous CNTF on the retinal transcriptome landscape and illuminate likely CNTF impacts in degenerating human retinas.
Insights
Ciliary neurotrophic factor (CNTF) impacts gene expression in degenerating retinas. While initially protective, CNTF alters photoreceptor genes and activates immune responses, affecting retinal cells.
Area of Science:
- Ophthalmology
- Neuroscience
- Genomics
Background:
- Ciliary neurotrophic factor (CNTF) shows neuroprotective potential for retinal degeneration.
- Understanding CNTF's molecular effects in the retina is crucial for therapeutic development.
Purpose of the Study:
- To investigate the molecular events triggered by CNTF in a preclinical model of retinitis pigmentosa.
- To identify CNTF-responsive cell types and pathways in the degenerating retina.
Main Methods:
- High-throughput RNA sequencing (RNA-seq) of Rds/Prph2 transgenic mice.
- Comparison of transcriptomes with and without short-term and long-term CNTF treatment.
- Integration of bulk RNA-seq and single-cell RNA-seq data.
Main Results:
- CNTF treatment altered photoreceptor gene expression and reduced key transcription factors.
- Acute CNTF exposure elevated innate immune and growth factor signaling pathways.
- Long-term CNTF exposure sustained immune responses and affected neuronal transmission and metabolism.
- CNTF-responsive cells included Müller glia, photoreceptors, and bipolar cells.
Conclusions:
- Exogenous CNTF significantly influences the retinal transcriptome in a degenerating environment.
- CNTF elicits complex molecular responses, including immune activation and metabolic changes.
- These findings provide insights into CNTF's potential impacts in human retinal degeneration.
