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Published on: August 16, 2018
The 5-HT(1A) receptor active compounds (R)-8-OH-DPAT and (S)-UH-301 modulate auditory evoked EEG responses in rats
K E Stevens1, H C O'Neill, G M Rose
1Medical Research, VA Medical Center, Denver, CO, USA.
Amino Acids
|July 27, 2006
Summary
This study found that serotonin 5-HT(1A) signaling plays a role in sensory inhibition. Compounds targeting these receptors may help treat sensory filtering deficits in conditions like schizophrenia.
Area of Science:
- Neuroscience
- Psychopharmacology
Background:
- Schizophrenia is associated with impaired sensory filtering.
- This deficit can be modeled in rodents using psychostimulant drugs.
- Sensory inhibition involves the brain's ability to filter repetitive stimuli.
Purpose of the Study:
- To investigate the role of serotonin 5-HT(1A) receptors in sensory inhibition.
- To examine the effects of amphetamine, a 5-HT(1A) agonist, and antagonist on sensory inhibition in rats.
Main Methods:
- Auditory evoked EEG potentials were recorded in Sprague-Dawley rats using a paired-stimulus paradigm.
- Rats received administrations of amphetamine, (R)-8-OH-DPAT (5-HT(1A) agonist), and (S)-UH-301 (5-HT(1A) antagonist).
- The ratio of test (T) to conditioning (C) amplitudes at the N40 peak was analyzed to assess sensory inhibition.
Main Results:
- Amphetamine administration decreased sensory inhibition, indicated by an increased T/C ratio.
- (R)-8-OH-DPAT increased the T/C ratio, while (S)-UH-301 did not significantly alter it.
- Both a lower dose of (R)-8-OH-DPAT and a high dose of (S)-UH-301 reversed the amphetamine-induced deficit.
Conclusions:
- Serotonin 5-HT(1A) signaling is implicated in regulating sensory inhibition.
- These findings support exploring 5-HT(1A) receptor modulators for treating sensory filtering deficits in schizophrenia.
