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Updated: Jun 14, 2025
08:58
Artificial Intelligence Approaches to Assessing Primary Cilia
Published on: May 1, 2021
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Serotonin signaling at cilia synapses.
Katherine DeLong1, Shu-Hsien Sheu2
1Department of Molecular and Cellular Physiology, Stanford University, Stanford, CA, USA.
Current Opinion in Neurobiology
|March 13, 2025
Summary
Researchers discovered a new way serotonin (5-HT) signals in the brain through axo-ciliary synapses. This pathway directly impacts gene expression and may offer insights into neurological conditions.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Serotonin (5-HT) is a crucial neuromodulator affecting cognition, mood, and sleep.
- The precise mechanisms of serotonergic signaling, especially structural and molecular aspects, are not fully understood.
Purpose of the Study:
- To investigate a novel mode of serotonergic transmission involving axo-ciliary synapses.
- To elucidate the molecular and cellular consequences of this signaling pathway.
Main Methods:
- Identification and characterization of axo-ciliary synapses in hippocampal pyramidal neurons.
- Utilizing volume electron microscopy to assess the prevalence of these contacts.
- Investigating the activation of ciliary 5-HT6R receptors and downstream signaling.
Main Results:
- A novel axo-ciliary synaptic pathway for serotonin transmission was identified.
- Localized 5-HT release at these synapses activates ciliary 5-HT6R receptors.
- This pathway induces chromatin remodeling and regulates neuronal gene expression.
Conclusions:
- Axo-ciliary synapses represent a distinct mechanism for serotonergic neuromodulation.
- This pathway provides a direct link between serotonin signaling and gene expression.
- Further research into axo-ciliary synapses could illuminate neuropsychiatric disorders.
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