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Updated: Jun 21, 2026
Evaluating Cell Death Signaling by Immunofluorescence in a Rat Model of Ischemic Stroke
Published on: January 3, 2025
Transduced human PEP-1-catalase fusion protein attenuates ischemic neuronal damage
Dae Won Kim1, Hoon Jae Jeong, Hye Won Kang
1Department of Biomedical Science and Research Institute for Bioscience and Biotechnology, College of Medicine, Hallym University, Chunchon 200-702, Korea.
Abstract:
Antioxidant enzymes are considered to have beneficial effects against various diseases mediated by reactive oxygen species (ROS). Ischemia is characterized by both oxidative stress and changes in the antioxidant defense system. Catalase (CAT) and superoxide dismutase (SOD) are major antioxidant enzymes by which cells counteract the deleterious effects of ROS. To investigate the protective effects of CAT, we constructed PEP-1-CAT cell-permeative expression vectors. When PEP-1-CAT fusion proteins were added to the culture medium of neuronal cells, they rapidly entered the cells and protected them against oxidative stress-induced neuronal cell death. Immunohistochemical analysis revealed that PEP-1-CAT prevented neuronal cell death in the hippocampus induced by transient forebrain ischemia. Moreover, we showed that the protective effect of PEP-1-CAT was observed in neuronal cells treated with PEP-1-SOD. Therefore, we suggest that transduced PEP-1-CAT and PEP-1-SOD fusion proteins could be useful as therapeutic agents for various human diseases related to oxidative stress, including stroke.
Insights
PEP-1-CAT and PEP-1-SOD fusion proteins protect neuronal cells from oxidative stress. These cell-permeative enzymes show potential as therapeutic agents for diseases linked to reactive oxygen species (ROS), including stroke.
Area of Science:
- Biochemistry
- Neuroscience
- Molecular Biology
Background:
- Reactive oxygen species (ROS) contribute to diseases through oxidative stress.
- Antioxidant enzymes like Catalase (CAT) and Superoxide Dismutase (SOD) combat ROS.
- Ischemia involves oxidative stress and altered antioxidant defenses.
Purpose of the Study:
- To investigate the protective effects of Catalase (CAT) using cell-permeative expression vectors.
- To evaluate the therapeutic potential of fusion proteins in oxidative stress-related conditions.
Main Methods:
- Construction of PEP-1-CAT cell-permeative expression vectors.
- Treatment of neuronal cells with PEP-1-CAT fusion proteins.
- Immunohistochemical analysis of hippocampal neuronal death following transient forebrain ischemia.
- Evaluation of PEP-1-SOD fusion protein effects.
Main Results:
- PEP-1-CAT fusion proteins rapidly entered neuronal cells.
- PEP-1-CAT protected neuronal cells against oxidative stress-induced death.
- PEP-1-CAT prevented neuronal cell death in the hippocampus after ischemia.
- PEP-1-SOD also demonstrated protective effects.
Conclusions:
- Transduced PEP-1-CAT and PEP-1-SOD fusion proteins offer protection against oxidative stress.
- These fusion proteins show promise as therapeutic agents for ROS-mediated diseases.
- Potential applications include stroke and other oxidative stress-related human diseases.
