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Exp Neurol. 2014 Nov;261:163-70. doi: 10.1016/j.expneurol.2014.05.018. Epub 2014 May 26.

GABAB receptors in maintenance of neocortical circuit function.

Author information

1
Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA.
2
Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Graduate Program in Neuroscience, University of California, San Francisco, San Francisco, CA 941432, USA; The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA. Electronic address: scott.baraban@ucsf.edu.

Abstract

Activation of metabotropic GABAB receptors (GABABRs) enhances tonic GABA current and substantially increases the frequency of spontaneous seizures. Despite the and pro-epileptic consequences of GABABR activation, mice lacking functional GABAB receptors (GABAB1R KO mice) exhibit clonic and rare absence seizures. To examine these mutant mice further, we recorded excitatory and inhibitory synaptic inputs and tonic mutant GABA currents from Layer 2 neocortical pyramidal neurons of GABAB1R WT and KO mice (P30-40). Tonic current was increased while the frequency of synaptic inputs was unchanged in KO mice relative to WT littermates. The neocortical laminar distribution of interneuron subtypes derived from the medial ganglionic eminence (MGE) was also not statistically different in KO mice relative to WT while the number of calretinin-positive, caudal GE-derived cells in Layer 1 was reduced. Transplantation of MGE progenitors obtained from KO mice lacking functional GABAB1R did not increase tonic inhibition in the host brain above that of media-injected controls. Taken together, these results suggest a complex role for GABAB receptors in mediating neocortical circuit function.

KEYWORDS:

GABAB; MGE; Neocortex; Tonic inhibition

PMID:
24873729
PMCID:
PMC4324605
DOI:
10.1016/j.expneurol.2014.05.018
[Indexed for MEDLINE]
Free PMC Article
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