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Suprachiasmatic Nucleus Vasoactive Intestinal Peptide Neurons Mediate Light-induced Transient Forgetting
Xiaoya Su1,2,3, Yikai Tang1, Yi Zhong4,5,6,7
1School of Life Sciences, Tsinghua University, Beijing, 100084, China.
Neuroscience Bulletin
|July 16, 2025
Summary
Bright light triggers transient forgetting by activating specific neurons in the brain's SCN (suprachiasmatic nucleus). This memory impairment is reversible, highlighting a new role for SCN VIP neurons in memory processing.
Area of Science:
- Neuroscience
- Memory Research
- Circadian Biology
Background:
- The suprachiasmatic nucleus (SCN) is primarily known for regulating circadian rhythms.
- The role of SCN neurons in memory modulation, particularly in response to environmental cues like light, is not well understood.
Purpose of the Study:
- To investigate the role of SCN vasoactive intestinal peptide (VIP) neurons in light-induced memory modulation.
- To elucidate the neural circuitry involved in transient forgetting mediated by light.
Main Methods:
- Utilized c-Fos expression and Ca2+ imaging to assess neuronal activity in SCN VIP neurons.
- Employed optogenetic and chemogenetic techniques to manipulate SCN VIP neuron activity.
- Investigated the SCN → PVT (paraventricular nucleus of the thalamus) VIP neuronal pathway.
Main Results:
- Acute bright light exposure selectively impairs trace fear memory.
- This memory impairment is mediated by the activation of SCN VIP neurons.
- Optogenetic and chemogenetic manipulations confirmed the causal role of SCN VIP neurons in this effect.
- The SCN → PVT VIP neuronal circuitry was identified as crucial for light-induced transient forgetting.
Conclusions:
- SCN VIP neurons play a critical role in mediating light-induced transient forgetting.
- This study reveals a novel function for SCN VIP neurons beyond circadian regulation.
- Identified a specific neural pathway (SCN → PVT) involved in modulating memory accessibility based on light cues.
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