Abstract
This chapter describes the experimental evidence of stress modulation of epileptic seizures and the potential role of corticosteroids and neurosteroids in regulating stress-linked seizure vulnerability. Epilepsy is a chronic neurological disorder that is characterized by repeated seizures. There are many potential causes for epilepsy, including genetic predispositions, infections, brain injury, and neurotoxicity. Stress is a known precipitating factor for seizures in individuals suffering from epilepsy. Severe acute stress and persistent exposure to stress may increase susceptibility to seizures, thereby resulting in a higher frequency of seizures. This occurs through the stress-mediated release of cortisol, which has both excitatory and proconvulsant properties. Stress also causes the release of endogenous neurosteroids from central and adrenal sources. Neurosteroids such as allopregnanolone and THDOC, which are allosteric modulators of GABA-A receptors, are powerful anticonvulsants and neuroprotectants. Acute stress increases the release of neurosteroids, while chronic stress is associated with severe neurosteroid depletion and reduced inhibition in the brain. This diminished inhibition occurs largely as a result of neurosteroid deficiencies. Thus, exogenous administration of neurosteroids (neurosteroid replacement therapy) may offer neuroprotection in epilepsy. Synthetic neurosteroid could offer a rational approach to control neurosteroid-sensitive, stress-related epileptic seizures.
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Abbreviations
- 3α-HSOR:
-
3α-hydroxysteroid oxidoreductase
- ACTH:
-
Adrenocorticotrophic hormone
- AED:
-
Anti-epileptic drug
- AP:
-
Allopregnanolone (brexanolone)
- CRH:
-
Corticotropin releasing hormone
- DHDOC:
-
5α-dihydro-deoxycorticosterone
- DHEAS:
-
Dehydroepiandrosterone sulfate
- DOC:
-
Deoxycorticosterone
- GAS:
-
General adaptation syndrome
- HPA:
-
Hypothalamic-pituitary-adrenal
- PS:
-
Pregnenolone sulfate
- PTSD:
-
Post-traumatic stress disorder
- THDOC:
-
Allotetrahydro-deoxycorticosterone
- TLE:
-
Temporal lobe epilepsy
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This work was supported by the National Institutes of Health Grants U01 NS083460, R21 NS076426 and R21 NS099009 (to D.S.R.).
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Reddy, D.S., Thompson, W., Calderara, G. (2020). Does Stress Trigger Seizures? Evidence from Experimental Models. In: Jones, N.C., Kanner, A.M. (eds) Psychiatric and Behavioral Aspects of Epilepsy . Current Topics in Behavioral Neurosciences, vol 55. Springer, Cham. https://doi.org/10.1007/7854_2020_191
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