Premium
Adenosine as an endogenous regulating factor of hippocampal sharp waves
Author(s) -
Wu Chiping,
Wong Teser,
Wu Xiadi,
Sheppy Evan,
Zhang Liang
Publication year - 2009
Publication title -
hippocampus
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.767
H-Index - 155
eISSN - 1098-1063
pISSN - 1050-9631
DOI - 10.1002/hipo.20497
Subject(s) - hippocampal formation , adenosine , endogeny , neuroscience , hippocampus , chemistry , population , pharmacology , biochemistry , biology , medicine , environmental health
Abstract The rodent hippocampus exhibits population activities called sharp waves (SPWs) during slow wave sleep and wake immobility. SPWs are important for hippocampal‐cortical communication and memory consolidation, and abnormal sharp wave‐ripple complexes are closely related to epileptic seizures. Although the SPWs are known to arise from the CA3 circuit, the local mechanisms underlying their generation are not fully understood. We hypothesize that endogenous adenosine is a local regulator of hippocampal SPWs. We tested this hypothesis in thick mouse hippocampal slices that encompass a relatively large hippocampal circuit and have a high propensity of generating spontaneous in vitro SPWs. We found that application of adenosine A1 receptor antagonists induced in vitro SPWs and that such induction was sensitive to blockade by NMDA receptor antagonists. By contrast, an increase in endogenous adenosine via pharmacological inhibition of adenosine transporters or adenosine degrading enzymes suppressed spontaneous in vitro SPWs. We thus suggest that the initiation and incidence of sharp wave‐like population events are under tight control by the activity of endogenously stimulated A1 receptors. © 2008 Wiley‐Liss, Inc.