Dysregulation of REV-ERBα impairs GABAergic function and promotes epileptic seizures in preclinical models

Area of Science:

• Neuroscience
• Chronobiology
• Molecular Biology

Background:

• Epilepsy mechanisms require further elucidation for improved therapies.
• Circadian rhythms influence physiological processes, potentially impacting neurological disorders.

Purpose of the Study:

• To investigate the role of Rev-erbα in the circadian regulation of epileptic seizures.
• To explore Rev-erbα's impact on synaptic function and GABAergic signaling in epilepsy.

Main Methods:

• Analysis of Rev-erbα expression in human epilepsy brain tissues and a mouse model.
• In vivo studies involving Rev-erbα ablation or pharmacological modulation in mice.
• Electrophysiological recordings in the mouse hippocampus to assess synaptic currents.
• Identification of GABA transporters regulated by Rev-erbα.

Main Results:

• Rev-erbα is upregulated in epilepsy and its modulation affects seizure susceptibility and diurnal seizure patterns.
• Rev-erbα manipulation alters inhibitory postsynaptic currents and GABAergic signaling in the hippocampus.
• Slc6a1 and Slc6a11 transporters are identified as Rev-erbα-regulated mediators of GABA clearance.
• Rev-erbα influences Slc6a1 and Slc6a11 expression via repression of E4bp4.

Conclusions:

• Rev-erbα plays a critical role in the circadian control of epilepsy.
• Rev-erbα modulates synaptic function by regulating GABAergic signaling.
• Findings suggest Rev-erbα as a potential therapeutic target at the intersection of circadian rhythms and epilepsy.