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Neuropharmacology. 2015 Jan;88:55-62.

Ambient GABA modulates septo-hippocampal inhibitory terminals via presynaptic GABAb receptors.

Abstract

The septo-hippocampal GABAergic pathway connects inhibitory neurons in the medial septum with hippocampal interneurons. Phasic release of GABA from septo-hippocampal terminals is thought to play an important role in shaping hippocampal network activity during behavior. Here, we found that GABA release from septo-hippocampal terminals is under negative feedback from the hippocampal local inhibitory network. We found that the strength of septo-hippocampal GABAergic inhibition is constrained by presynaptic GABAb receptors that are activated by ambient GABA during states of increased hippocampal network activity.

[Indexed for MEDLINE]

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