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J Neurophysiol (September 13, 2006). doi:10.1152/jn.00682.2006
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00682.2006v1
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Submitted on July 3, 2006
Accepted on September 7, 2006

Nucleus-specific abnormalities of GABAergic synaptic transmission in a genetic model of absence seizures

Thomas Bessaïh1, Laurence Bourgeais1, Carmen I Badiu2, David A Carter3, Tibor I Toth3, Diego Ruano4, Bertrand Lambolez1, Vincenzo Crunelli3, and Nathalie Leresche1*

1 UMR 7102 NPA, Université Pierre et Marie Curie-Paris 6, Paris, France
2 CNRS UMR 5543, Université Victor Segalen, Bordeaux 2, Bordeaux, France
3 School of Biosciences, Cardiff University, Cardiff, United Kingdom
4 Depto. de Bioquímica, Bromatología, Toxicología y Medicina Legal, Facultad de Farmacia, Sevilla, Spain

* To whom correspondence should be addressed. E-mail: nathalie.leresche{at}snv.jussieu.fr.

Human and experimental studies indicate that molecular genetic changes in GABAA receptors may underlie the expression of spike-and-waves discharges (SWDs) occuring during absence seizures. However, the full spectrum of the genetic defects underlying these seizures has only been partially elucidated, the expression and functional profiles of putative abnormal protein(s) within the thalamocortical network are undefined, and the pathophysiological mechanism(s) by which these proteins would lead to absence paroxysms are poorly understood. Here we investigated GABAA IPSCs in key thalamocortical areas, i.e. the somatosensory cortex, ventrobasal thalamus (VB) and nucleus reticularis thalami (NRT), in pre-seizure Genetic Absence Epilepsy Rats from Strasbourg (GAERS), a well-established genetic model of typical absence seizures that shows no additional neurological abnormalities, and compared their properties to age-matched Non-Epileptic Controls (NEC). Miniature GABAA IPSCs of VB and cortical layers II/III neurons were similar in GAERS and NEC, whereas in GAERS NRT neurons they had 25% larger amplitude, 40% faster decay. In addition, baclofen was significantly less effective in decreasing the frequency of NRT mIPSCs in GAERS than in NEC, whereas no difference was observed for cortical and VB mIPSCS between the two strains. Paired-pulse depression was 45% smaller in GAERS NRT, but not in VB, and was insensitive to GABAB antagonists. These results point to subtle, nucleus-specific, GABAA receptor abnormalities underlying SWDs of typical absence seizures, rather than a full block of these receptors across the whole thalamocortical network, and their occurrence prior to seizure onset suggests that they might be of epileptogenic significance.




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