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Published on: May 15, 2018
Habenula regulates cardiovascular activities in the insula cortex in a rat model of epilepsy
Yudan Lv1, Dihui Ma, Hongmei Meng
1Department of Neurology, The First Hospital of Jilin University, Changchun, P. R. China.
Insights
Sudden death in epilepsy may involve fatal arrhythmia. This study shows the habenular nucleus regulates cardiovascular activity during insular epilepsy in rats, offering insights into epilepsy mortality.
Area of Science:
- Neuroscience
- Cardiovascular Physiology
- Epileptology
Background:
- Epilepsy carries a high mortality risk, often linked to sudden unexpected death.
- Fatal arrhythmia is a suspected cause of sudden death in epilepsy, particularly in insular epilepsy.
- The insular cortex's role in cardiovascular regulation during seizures is not fully understood.
Purpose of the Study:
- To investigate the influence of the habenular nucleus on cardiovascular function in a rat model of insular epilepsy.
- To determine if habenular nucleus injury affects cardiovascular responses during epileptic seizures.
- To elucidate the neural mechanisms underlying cardiovascular dysregulation in insular epilepsy.
Main Methods:
- A rat model of insular epilepsy was established using kainic acid microinjection.
- Rats were divided into control, insular epilepsy, habenular nuclei injury, and combined injury groups.
- Cardiovascular parameters (heart rate, blood pressure) and plasma norepinephrine levels were assessed during seizures.
Main Results:
- Rats with insular epilepsy exhibited significantly elevated heart rate, blood pressure, and plasma norepinephrine during seizures compared to controls.
- Injury to the habenular nuclei alone did not alter baseline cardiovascular parameters or norepinephrine levels.
- Bilateral habenular nuclei injury prior to inducing epilepsy resulted in lower blood pressure during seizures compared to rats with only habenular injury.
Conclusions:
- The insular cortex plays a significant role in modulating cardiovascular activity in the context of epilepsy.
- The habenular nucleus acts as a regulator of cardiovascular responses during insular epileptic seizures.
- Targeting the habenular nucleus may offer therapeutic potential for managing cardiovascular complications in epilepsy.
Background:
Epilepsy has a high mortality rate due to sudden death, which is poorly understood. However, recent research has indicated that it may be associated with fatal arrhythmia, which occurs commonly in insular epilepsy.
Objective:
To examine the effects of the habenular nucleus on cardiovascular activities in a rat model of insular epilepsy.
Methods:
Adult rats (n = 32) were divided into four groups: Group A (normal control); Group B (insular epilepsy); Group C (habenular nuclei injury alone); and Group D (bilateral habenular nuclei injury one week prior to the insular epilepsy). A rat model of epilepsy was made in the right insula by microinjection of kainic acid (KA, 0.3 μL). Behavioral activities were observed according to Racine scales. The habenular nuclei were injured by direct current electric shock. Heart rate, blood pressure, and plasma norepinephrine were measured in the four groups under quite conditions or during seizure.
Results:
We found that the rats in Group B have significantly higher heart rate, blood pressure, and plasma norepinephrine than those in Group A or Group D during seizure; however, there was no difference in blood pressure, heart rate, or plasma norepinephrine between Groups A and C. Moreover, the rats in the Group D had a significant lower blood pressure when compared with those in the Group C; however, no difference was observed in the heart rate and norepinephrine during seizure.
Conclusion:
The insula cortex has close association with cardiovascular activities in rats from our insula epilepsy model. The habenular nuclei can regulate cardiovascular activities during insular epilepsy.
