Abstract:
:Fast rhythmic activity in a frequency range between 20 and 40 Hz occurs in vitro in hippocampal area CA3 after activation of muscarinic receptors. Here we show that carbachol-induced rhythmic activity is modulated by serotonin (5-HT). Spectral analysis reveals that 5-HT (0.3-30 microM) decreases power, but not frequency, of rhythmic activity in a concentration-dependent and reversible manner. The 5-HT(1A) agonists 8-OH-DPAT and buspirone mimic the effect of 5-HT, whereas the selective 5-HT(1A) receptor antagonist WAY-100635 (1 microM) significantly prevents the effect of 5-HT. In contrast to the effect of 5-HT(1A) agonists, the 5-HT(2) agonist DOI increases spectral power and prevents the reduction of spectral power by 5-HT. Application of WAY-100635 alone has no effect on rhythmic activity. Likewise, the 5-HT(2) antagonist ritanserin (10 microM) does not affect rhythmic activity, or its reduction by 5-HT. Finally, the 5-HT re-uptake inhibitor fluoxetine significantly decreases rhythmic activity in the presence of a low concentration of 5-HT, suggesting that 5-HT released from terminals in the slice likely reduces rhythmic activity. These results strongly implicate 5-HT(1A) and 5-HT(2) receptors in the modulation of spectral power of carbachol-induced rhythmic activity and that 5-HT(1A) receptors are responsible for the prevailing effect of 5-HT.
journal_name
Neuropharmacologyjournal_title
Neuropharmacologyauthors
Krause M,Jia Ydoi
10.1016/j.neuropharm.2004.10.011subject
Has Abstractpub_date
2005-03-01 00:00:00pages
381-90issue
3eissn
0028-3908issn
1873-7064pii
S0028-3908(04)00362-4journal_volume
48pub_type
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