Beta and gamma range EEG power-spectrum correlation with spiking discharges in DBA/2J mice absence model: role of GABA receptors.

Abstract:

PURPOSE:To describe the correlations between spiking pattern and EEG power spectrum frequency in DBA/2J mice, a model for murine absence seizures, after gamma-aminobutyric acid (GABA)(B) modulation. METHODS:The animals were first tested with the GABA(B) agonist l-baclofen followed by the GABA(B) antagonist SCH 50911. Moreover, digital EEGs recorded under experimental conditions were processed at baseline and 10 and 20 min after l-baclofen injection. This procedure was followed by injection of the GABA(B) antagonist SCH50911 and by an additional EEG evaluation at 10 and 20 min from drug administration. The power spectra analysis of signals was obtained for delta (0.5-3 Hz), theta (3.5-7.5 Hz), alpha (8-12 Hz), beta (13-20 Hz), and gamma (21-50 Hz) frequencies. RESULTS:The spiking pattern and power spectrum of beta activity was increased by 80%), whereas gamma power increased (correlation, 0.92; p < 0.001). The remaining frequency bands were unaffected. CONCLUSIONS:This study confirms the potential of GABA(B) antagonists in contrasting seizure absence in rodent models and suggests the application of drugs with a similar mechanism in humans. In addition, because GABA(B) antagonists not only contrast seizure in rodent models of absence but also improve "cognitive" performance, it could be hypothesized that gamma increase, correlated with optimized cortical binding during coherent percepts, may produce potential cognition-enhancing effects.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Marrosu F,Santoni F,Fà M,Puligheddu M,Barberini L,Genugu F,Frau R,Manunta M,Mereu G

doi

10.1111/j.1528-1167.2006.00456.x

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

489-94

issue

3

eissn

0013-9580

issn

1528-1167

pii

EPI456

journal_volume

47

pub_type

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