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Electroconvulsive Seizures in Rats and Fractionation of Their Hippocampi to Examine Seizure-induced Changes in Postsynaptic Density Proteins
Published on: August 15, 2017
Dynamic changes in the proteomic profile of mesial temporal lobe epilepsy at different disease stages in an immature
Liwen Wu, Ciliu Zhang, Fei Yin1
1Department of Pediatrics, Xiangya Hospital, Central South University, Changsha, Hunan Province410008. China. yf2323@hotmail.com.
Abstract:
Mesial temporal lobe epilepsy (MTLE) is the most prevalent form of refractory symptomatic epilepsy, most patients with MTLE respond poorly to anti-epileptic drugs (AEDs). The pathophysiological mechanism of MTLE remains unclear, blocking the path to successful prevention and treatment. We know that change in brain plasticity after long epileptic seizures in early childhood can produce long-term effects in the individual. It is a dynamic process, developing from early injuries in the immature brain to chronic epilepsy in adults. However, most MTLE studies are limited to a certain aspect of a certain time, rather than taking the long view of epilepsy as a systematic and chronological disease. In this report, we screened and identified proteins that are differentially expressed in the acute, latent and chronic stages of MTLE in an immature rat model. Proteins were screened by proteomics, and western blot was used to confirm differentially expressed proteins, such as synapsin-1, dynamin-1 and neurogranin, in hippocampi from both rats and humans with MTLE. Our results show that the synaptic dysfunction caused by abnormal expression of synaptic proteins play a critical role in the pathogenesis of chronic MTLE.
Insights
Mesial temporal lobe epilepsy (MTLE) involves unclear mechanisms and poor drug response. This study identifies synaptic protein changes in rat models, revealing their role in chronic MTLE development.
Area of Science:
- Neuroscience
- Epileptology
- Molecular Biology
Background:
- Mesial temporal lobe epilepsy (MTLE) is the most common form of refractory epilepsy, often unresponsive to anti-epileptic drugs (AEDs).
- The underlying pathophysiological mechanisms of MTLE are not fully understood, hindering effective prevention and treatment strategies.
- Epilepsy is a dynamic, chronological process influenced by early brain injury and plasticity, yet studies often focus on isolated aspects.
Purpose of the Study:
- To identify differentially expressed proteins across the acute, latent, and chronic stages of MTLE.
- To investigate the role of these protein changes in the long-term development of chronic MTLE.
- To validate findings in both immature rat models and human MTLE hippocampi.
Main Methods:
- Utilized proteomics to screen for differentially expressed proteins in an immature rat model of MTLE.
- Employed western blot analysis to confirm the expression levels of key proteins.
- Examined protein expression in hippocampal tissues from both rat models and human patients with MTLE.
Main Results:
- Identified specific proteins, including synapsin-1, dynamin-1, and neurogranin, that are differentially expressed during MTLE progression.
- Confirmed these protein expression changes in hippocampal samples from both rats and humans affected by MTLE.
- Demonstrated a critical role for synaptic dysfunction, driven by abnormal synaptic protein expression, in the pathogenesis of chronic MTLE.
Conclusions:
- Abnormal expression of synaptic proteins is a key factor in the development of chronic MTLE.
- Understanding these molecular changes offers potential targets for future therapeutic interventions.
- This research highlights the importance of a chronological perspective in studying epilepsy pathogenesis.
