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Acetaminophen modifies hippocampal synaptic plasticity via a presynaptic 5-HT2 receptor
1Neuroscience Center of Excellence, School of Medicine, LSU Health Sciences Center, 2020 Gravier Street, Suite D, New Orleans, LA 70112, USA. cchen@lsuhsc.edu
Neuroreport
|April 15, 2003
Summary
Acetaminophen (APAP) affects brain function by altering synaptic plasticity in the hippocampus. This common pain reliever impacts long-term potentiation (LTP) and paired-pulse facilitation (PPF) through serotonin receptors.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Acetaminophen (APAP) targets COX-3, a newly identified cyclooxygenase isozyme.
- Selective COX-2 inhibitors are known to reduce hippocampal membrane excitability and long-term potentiation (LTP).
Purpose of the Study:
- To investigate the effects of APAP on hippocampal LTP.
- To explore the potential mechanisms underlying APAP's influence on synaptic plasticity.
Main Methods:
- Electrophysiological recordings in the hippocampus.
- Assessment of LTP induction and paired-pulse facilitation (PPF).
- Administration of APAP and a 5-hydroxytryptamine (serotonin, 5-HT) receptor antagonist.
Main Results:
- APAP significantly reduced LTP induction in the hippocampus.
- APAP increased paired-pulse facilitation (PPF), suggesting presynaptic modulation.
- The effects of APAP on LTP and PPF were reversed by a 5-HT(2/1) receptor antagonist.
Conclusions:
- APAP modulates synaptic plasticity in the hippocampus.
- The observed effects of APAP are likely mediated by presynaptic 5-HT(2) receptors.
- APAP's action on synaptic plasticity may involve interactions with the serotonergic system.