α2 GABAA receptor sub-units in the ventral hippocampus and α5 GABAA receptor sub-units in the dorsal hippocampus mediate anxiety and fear memory

K. McEown, D. Treit

研究成果: Article査読

22 被引用数 (Scopus)

抄録

Temporary neuronal inactivation of the ventral hippocampus with the GABAA agonist muscimol suppresses unconditioned fear behavior (anxiety) but inactivation of the dorsal hippocampus does not. On the other hand, inactivating the dorsal hippocampus disrupts fear memory, while inactivating the ventral hippocampus does not. Here we investigate the roles of hippocampal GABAA receptor sub-units in mediating these anxiolytic and amnesic effects of GABAA receptor agonists. We microinfused TPA023 (α2 agonist) or TB-21007 (inverse α5 agonist) into the dorsal or ventral hippocampus prior to testing rats in two animal models of anxiety: the elevated plus-maze and shock-probe burying test. Twenty-four hours later rats were re-tested in the shock-probe chamber with a non-electrified probe to assess their memory of the initial shock-probe experience (i.e., fear memory). We found that TPA023 was anxiolytic in the plus-maze and shock-probe burying tests when microinfused into the ventral hippocampus. However, TPA023 did not affect anxiety-related behavior when infused into the dorsal hippocampus. Conversely, we found that the α5 sub-unit inverse agonist TB-21007 impaired rats' memory of the initial shock-probe experience when infused into the dorsal hippocampus, but not when infused into the ventral hippocampus. This double dissociation suggests that α2 GABAA receptor sub-units in the ventral hippocampus mediate unconditioned fear or anxiety, while α5 GABAA receptor sub-units in the dorsal hippocampus mediate conditioned fear memory.

本文言語English
ページ(範囲)169-177
ページ数9
ジャーナルNeuroscience
252
DOI
出版ステータスPublished - 2013 11 12
外部発表はい

ASJC Scopus subject areas

  • Neuroscience(all)

フィンガープリント 「α2 GABA<sub>A</sub> receptor sub-units in the ventral hippocampus and α5 GABA<sub>A</sub> receptor sub-units in the dorsal hippocampus mediate anxiety and fear memory」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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