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Two distinct effects of 5-hydroxytryptamine on single cortical neurons
M F Davies1, R A Deisz, D A Prince
1Stanford University Medical Center, Department of Neurology, CA 94305.
Brain Research
|October 13, 1987
Summary
Serotonin (5-hydroxytryptamine; 5-HT) has opposing effects on cortical neurons. It can depolarize neurons via 5-HT2 receptors or hyperpolarize them via 5-HT1A receptors, impacting neuronal function.
Area of Science:
- Neuroscience
- Neurophysiology
Background:
- Serotonin (5-hydroxytryptamine; 5-HT) is a key neurotransmitter influencing various brain functions.
- Understanding 5-HT's effects on neocortical neurons is crucial for comprehending its role in cognition and behavior.
Purpose of the Study:
- To investigate the impact of serotonin (5-HT) on the membrane properties of neocortical neurons.
- To identify the specific serotonin receptor subtypes mediating these effects.
Main Methods:
- Intracellular recording techniques were employed to analyze neuronal responses.
- Pharmacological agents, including 5-HT2 and 5-HT1A receptor antagonists and agonists, were used to probe receptor function.
Main Results:
- Serotonin (5-HT) induced depolarization in 68% of cortical neurons, likely by reducing K+ conductance via 5-HT2 receptors.
- A distinct hyperpolarization, insensitive to 5-HT2 antagonists, was observed in 26% of neurons and mimicked by a 5-HT1A agonist (8-OH-DPAT).
Conclusions:
- Cortical pyramidal neurons express at least two distinct functional serotonin receptors.
- Activation of these receptors leads to opposing effects on neuronal membrane potential and conductance, highlighting the complexity of serotonergic modulation.