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Updated: Jun 5, 2026
Analysis of Gene Expression Changes in the Rat Hippocampus After Deep Brain Stimulation of the Anterior Thalamic Nucleus
Published on: March 8, 2015
[mRNA expression of activity-regulated cytoskeletal-associated protein in hippocampus induced by insular-kindled
Pei-song Zhang1, Feng Wang, Qing-zhu Liu
1Department of Neurosurgery, Affiliated Hospital of Ningxia Medical University, Key Lab of Craniocerbral Diseases, Ningxia Hui Autonomous Region, Yinchuan 750004, China.
Objective:
To investigate the expression of Arc mRNA in insular electrical kindled and single electrical stimulated rats and its significance.
Methods:
Male SD rats were divided randomly into kindled group, single electrical stimulated group, sham-operated group and control group. Each group was divided into 2 sub-groups at different time points. Kindled group: establishing chronic insular electrical kindled model, decapitation to perform RT-PCR of Arc mRNA on hippocampus and to applying in situ hybridization of Arc mRNA on dentate gyrus; Single electrical stimulated group: using the same method as the kindled group with only electrical stimulation twice; Sham-operated group: using the same method to the kindled group without electrical stimulation;
Control Group:
no surgery.
Results:
Expression of Arc mRNA in the hippocampus of single electrical stimulated, sham-operated and control groups were 0.72 ± 0.14, 0.75 ± 0.16 and 0.71 ± 0.14 respectively. They were significantly less than the kindled group of 1.78 ± 0.43(P < 0.01) at 3 h. The expression of Arc mRNA had no significant difference (P > 0.05) among 4 groups at 6 h; in situ hybridization (cell count) of Arc mRNA showed the expression of Arc mRNA in the kindled group was 112.8 ± 6.0. And it was significantly higher than the other three groups of 46.25 ± 4.35, 45.25 ± 6.23, 44.75 ± 6.49 (P < 0.01) after 3 h, there were no significant difference among 4 groups at 6 h (P > 0.05).
Conclusion:
Insular epilepsy increase the expression of Arc mRNA in hippocampus. Arc may play an important role in the synaptic plasticity of insular epilepsy.
Insights
Insular epilepsy significantly increases Arc mRNA expression in the hippocampus. This suggests Arc plays a key role in the synaptic plasticity associated with insular epilepsy.
Area of Science:
- Neuroscience
- Molecular Biology
- Epilepsy Research
Context:
- Epilepsy is a chronic neurological disorder characterized by recurrent seizures.
- Insular epilepsy involves seizures originating in the insular cortex, a brain region crucial for various cognitive and emotional functions.
- Understanding the molecular mechanisms underlying epilepsy is vital for developing targeted therapies.
Purpose:
- To investigate the expression levels of Activity-Regulated Cytoskeleton-associated protein (Arc) mRNA in a rat model of insular electrical kindling.
- To determine the role of Arc mRNA in the hippocampus and dentate gyrus following insular electrical stimulation.
- To elucidate the significance of Arc mRNA in the context of insular epilepsy.
Summary:
- Rats with chronic insular electrical kindling exhibited significantly higher Arc mRNA expression in the hippocampus compared to single-stimulated, sham-operated, and control groups at 3 hours post-stimulation (1.78 vs. 0.72-0.75).
- In situ hybridization confirmed a marked increase in Arc mRNA-expressing cells in the kindled group (112.8 cells) versus other groups (44.75-46.25 cells) at 3 hours.
- No significant differences in Arc mRNA expression were observed among the groups at 6 hours, indicating a transient but pronounced effect of kindling.
Impact:
- The findings highlight that insular epilepsy markedly upregulates Arc mRNA expression in the hippocampus.
- Arc mRNA is implicated as a significant factor in the synaptic plasticity alterations occurring in insular epilepsy.
- This research provides molecular insights that could inform future therapeutic strategies for epilepsy targeting synaptic function.
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