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Role of Caspase 3 in neuronal apoptosis after acute brain injury
Xinyu Yang1, Shuyuan Yang, Jianning Zhang
1Department of Neurosurgery, General Hospital of Tianjin Medical University, China.
Objective:
To analyze the role of Caspase 3 in neuronal apoptosis after acute brain injury.
Methods:
Experiments were carried out with rat diffuse brain trauma model. The neuronal DNA injury in cortex and hippocampus was observed by TUNEL stain. The mRNA and protein expressions and enzyme activation of Caspase 3 were observed by Northern blot, in situ hybridization, immunohistochemistry stain and Western blot, respectively. Special Caspase 3 enzyme inhibitor was used to observe the therapeutic effect.
Results:
TUNEL positive neurons appeared 2 hours after severe trauma, peaked at 1 day and lasted for 7 days. Northern blot showed that the Caspase 3 mRNA expression was increased and peaked at 1 day, about twice higher than the control. In the area of cortex and hippocampus, positive mRNA staining neurons appeared most distinct on one day. With the antibody for Caspase 3 P20 subunit, the active Caspase 3 expression peaked at 1-3 days. The electrophoresis band of PARP degradation would be seen by Western blot. Caspase 3 enzyme inhibitor could reduce apoptotic neuronal death without any effect on Caspase 3 P20 subunit expression.
Conclusions:
After brain trauma, Caspase 3 mRNA and protein expressions and enzyme activation are enhanced in combination with neuronal apoptosis. Special Caspase 3 enzyme inhibitor can apparently decrease the neuronal apoptosis.
Insights
Caspase 3 (cell death protease) activation increases neuronal apoptosis following acute brain injury. Inhibiting Caspase 3 significantly reduces this cell death, offering a potential therapeutic target.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Acute brain injury triggers complex cellular responses, including programmed cell death (apoptosis).
- Caspase 3, a key executioner protease, is implicated in apoptotic pathways.
- Understanding its role is crucial for developing neuroprotective strategies.
Purpose of the Study:
- To investigate the role of Caspase 3 in neuronal apoptosis after acute brain injury.
- To evaluate the therapeutic potential of inhibiting Caspase 3.
Main Methods:
- A rat diffuse brain trauma model was utilized.
- Neuronal DNA damage was assessed using TUNEL staining.
- Caspase 3 mRNA and protein expression, and enzyme activation were analyzed via Northern blot, in situ hybridization, immunohistochemistry, and Western blot.
- The effect of a specific Caspase 3 inhibitor was examined.
Main Results:
- TUNEL-positive neurons indicative of apoptosis were observed within 2 hours post-trauma, peaking at 1 day and persisting for 7 days.
- Caspase 3 mRNA expression significantly increased, peaking at 1 day.
- Active Caspase 3 (P20 subunit) expression peaked at 1-3 days post-injury.
- PARP degradation, a marker of apoptosis, was detected.
- Caspase 3 inhibition reduced neuronal apoptosis without affecting Caspase 3 P20 subunit expression.
Conclusions:
- Caspase 3 expression and activation are significantly upregulated following acute brain injury, correlating with neuronal apoptosis.
- Inhibition of Caspase 3 demonstrates a clear therapeutic effect in reducing apoptotic neuronal death.
