Neurotensin orchestrates valence assignment in the amygdala.
Hao Li1, Praneeth Namburi2, Jacob M Olson2,3
1Salk Institute for Biological Studies, La Jolla, CA, USA.
Nature
|July 21, 2022
Summary
Neurotensin (NT) from the thalamus signals valence in the basolateral amygdala (BLA). This neuropeptide modulates reward and punishment learning by influencing BLA neural dynamics and behavior.
Area of Science:
- Neuroscience
- Behavioral Science
Background:
- Associating cues with rewards or punishments is vital for survival.
- The basolateral amygdala (BLA) plays a key role in processing valence, but mechanisms of information routing and timescale integration remain unclear.
Purpose of the Study:
- To investigate the role of neurotensin (NT)-expressing neurons in the paraventricular nucleus of the thalamus (PVT) projecting to the BLA (PVT-BLA:NT) in valence assignment.
- To elucidate how NT modulates BLA activity and behavior during associative learning.
Main Methods:
- Optogenetic activation and projection-specific gene knockout of NT in the PVT-BLA pathway.
- In vivo calcium imaging and NT sensing in the BLA.
- CRISPR-mediated gene knockout to assess behavioral outcomes.
Main Results:
- Activation of PVT-BLA:NT projections enhanced reward learning.
- Knockout of NT in PVT-BLA projections augmented punishment learning.
- Reward learning increased PVT-BLA:NT calcium dynamics and NT levels in the BLA; punishment learning decreased them.
- CRISPR knockout of NT in PVT-BLA blunted BLA neural activity and altered behavioral strategies.
Conclusions:
- Neurotensin (NT) acts as a valence signal in the BLA.
- NT is a critical neuromodulator for assigning positive and negative valence.
- NT extends valence-specific synaptic plasticity to behaviorally relevant timescales.
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