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Updated: Sep 30, 2026
Quantification of Immunostained Caspase-9 in Retinal Tissue
Published on: July 25, 2022
Activation of caspase-3 during degeneration of the outer nuclear layer in the rd mouse retina
Dong-Hwan Kim1, Jeong-a Kim, Jun-Sub Choi
1Laboratory of Ophthalmology and Visual Science, College of Medicine, Catholic University of Korea and Catholic Research Institute of Medical Sciences, Seoul, Republic of Korea.
Abstract:
Caspase activation has been implicated in apoptosis, and the nature of the apoptotic stimulus determines the specific caspase activation during apoptosis. In this study, we examined the activation of caspase-3 during photoreceptor degeneration in the rd mouse, which has a mutation on a gene encoding cyclic GMP phosphodiesterase. The outer nuclear layer of the rd mouse retina was observed using light and electron microscopy. The progress of degeneration was determined chronologically and correlated with the activation of caspase-3 and the fragmentation of poly-ADP-ribose polymerase. Additionally, the active form of caspase-3 was detected during photoreceptor degeneration in the outer nuclear layer of the rd mouse. The chronological observation of the caspase-3 activation pattern correlates with the pattern of photoreceptor degeneration. As a result of this study, we present here our findings that caspase-3 was activated in photoreceptor cells of the rd mouse.
Insights
This study shows caspase-3 activation occurs in photoreceptor cells during retinal degeneration in the rd mouse model. This finding links caspase-3 to the specific cell death pathway in this genetic condition.
Area of Science:
- Ophthalmology
- Neuroscience
- Cell Biology
Background:
- Caspase activation is crucial in programmed cell death (apoptosis).
- The specific caspase activated depends on the apoptotic trigger.
- Photoreceptor degeneration in the rd mouse is linked to a genetic defect in cyclic GMP phosphodiesterase.
Purpose of the Study:
- To investigate the role and timing of caspase-3 activation during photoreceptor degeneration in the rd mouse.
- To correlate caspase-3 activation with the progression of retinal degeneration.
Main Methods:
- Utilized light and electron microscopy to examine the outer nuclear layer of rd mouse retinas.
- Chronologically assessed the progress of photoreceptor degeneration.
- Monitored caspase-3 activation and poly-ADP-ribose polymerase fragmentation.
Main Results:
- Confirmed the presence of active caspase-3 within photoreceptor cells during degeneration.
- Observed a chronological correlation between caspase-3 activation patterns and the progression of photoreceptor degeneration.
- Detected fragmentation of poly-ADP-ribose polymerase, a caspase-3 substrate.
Conclusions:
- Caspase-3 is activated in photoreceptor cells during the degenerative process in the rd mouse.
- The timing of caspase-3 activation aligns with the observed photoreceptor cell death.
- This study implicates caspase-3 in the specific mechanism of photoreceptor loss in the rd mouse model.
