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Published on: June 11, 2020
Effect of visual stimulation on epilepsy susceptibility in neonatal hypoglycemic brain injury rats during development
Yifan Sun1, Xiao Li2, Yan Dong2
1Department of Children's Development and Behavior Center, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China.
Insights
Visual stimulation reduced epilepsy susceptibility in neonatal rats with brain injury. This intervention increased key protein expressions, offering a potential therapeutic strategy for epilepsy.
Area of Science:
- Neuroscience
- Epileptology
- Developmental Biology
Background:
- Neonatal hypoglycemic brain injury (HBIN) is a significant risk factor for developing epilepsy.
- Understanding the mechanisms underlying epilepsy susceptibility after HBIN is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the therapeutic potential of visual stimulation in mitigating epilepsy susceptibility in a rat model of neonatal hypoglycemic brain injury (HBIN).
- To elucidate the underlying neurobiological mechanisms, focusing on the expression of Brain-Derived Neurotrophic Factor (BDNF) and Synaptophysin (SYN) in the occipital cortex.
Main Methods:
- Seventy-five Sprague-Dawley rats were divided into control, HBIN model, and HBIN with visual stimulation groups.
- HBIN was induced using insulin injection. Visual stimulation was applied daily from postnatal day 14 to 28.
- Seizure susceptibility was assessed using pentylenetetrazol (PTZ) challenge, and brain tissue was analyzed for BDNF and SYN expression via Magnetic Resonance Imaging (MRI).
Main Results:
- Neonatal hypoglycemic brain injury induced occipital lobe abnormalities and increased seizure susceptibility.
- Visual stimulation significantly reduced seizure scores in HBIN rats compared to the untreated HBIN group.
- Brain-Derived Neurotrophic Factor (BDNF) and Synaptophysin (SYN) expression levels were notably higher in the visual stimulation group.
Conclusions:
- Visual stimulation demonstrates a neuroprotective effect, reducing epilepsy susceptibility in neonatal rats with brain injury.
- The observed therapeutic benefits are likely mediated by the upregulation of BDNF and SYN expression in the occipital cortex, suggesting a role in synaptic plasticity and neuronal resilience.
Objective:
To investigate the effect of visual stimulation on epilepsy susceptibility in neonatal hypoglycemic brain injury (HBIN) rats and its underlying mechanisms.
Methods:
Seventy-five 2-day-old Sprague-Dawley rats were divided into three groups: control (N, N = 25), model (NH, N = 25), and visual stimulation (NH-V, N = 25). The NH and NH-V groups were injected with insulin (40 U/kg) on postnatal days 2, 4, and 6, and blood glucose was monitored. The NH-V group received daily 2-h visual stimulation from P14 to P28. At P21, brain Magnetic Resonance Imaging (MRI) was performed. Pentylenetetrazol (PTZ) was injected to induce seizures and recorded at P28. Brain tissue was analyzed for Brain-Derived Neurotrophic Factor (BDNF) and Synaptophysin (SYN) expression.
Results:
(i) In the NH and NH-V groups, blood glucose decreased after insulin injection, with behavioral changes observed at 1-4 h. One rat in the NH group had spontaneous seizures. (ii) MRI at 15 days showed occipital lobe abnormalities in 50% of NH rats, with no changes in controls. (iii) In PTZ-induced seizures, the N group had significantly lower seizure scores than the NH group, with the NH-V group showing further reduction. (iv) BDNF and SYN expression were higher in the NH-V group compared to the NH group.
Conclusion:
Visual stimulation reduces epilepsy susceptibility in neonatal HBIN rats, likely through upregulation of BDNF and SYN expression in the occipital cortex.
