Presynaptic, extrasynaptic and axonal GABAA receptors in the CNS: where and why?

Kullmann, D.M., Ruiz, A., Rusakov, D.M., Scott, R., Semyanov, A. and Walker, M.C. (2005) Presynaptic, extrasynaptic and axonal GABAA receptors in the CNS: where and why? Progress in Biophysics and Molecular Biology, 87 (1). pp. 33-46.

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Although GABA(A) receptors are widely distributed at inhibitory synapses on dendrites and cell bodies of neurons, they also occur in other places, in particular at synapses made on axons and in extrasynaptic membranes. This review summarises some of the evidence that presynaptic receptors modulate transmission not only at primary afferents in the spinal cord, but also at a variety of sites in the brain, including hippocampal mossy fibres. These receptors modulate transmitter release via several different mechanisms. Another form of unconventional GABA(A) receptor-mediated signalling is the mediation of a tonic conductance, seen in granule cells of the cerebellum and dentate gyrus and also in hippocampal interneurons. Tonic signalling appears to be mediated by extrasynaptic receptors. The adaptive significance of this form of signalling remains poorly understood.

Item Type:Article
Uncontrolled Keywords:Presynaptic inhibition; GABA receptors; Tonic; Phasic; Subunit
Departments, units and centres:Department of Pharmacology > Department of Pharmacology
ID Code:2458
Journal or Publication Title:Progress in Biophysics and Molecular Biology
Deposited By:Library Staff
Deposited On:11 Nov 2011 11:40
Last Modified:11 Nov 2011 11:40

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