A thalamo-amygdalar circuit underlying the extinction of remote fear memories
| Autor: | Giulia Santoni, Lukas van den Heuvel, Bianca A. Silva, Simone Astori, Hendrik Heiser, Carmen Sandi, Maria Fernanda Martinez-Reza, Johannes Gräff, Allison M. Burns |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Memory Long-Term contributes reuniens neurons Optogenetics Extinction Psychological 03 medical and health sciences Mice 0302 clinical medicine Thalamus reconsolidation expression Neural Pathways medicine Biological neural network Premovement neuronal activity Animals neural circuits projections mechanisms General Neuroscience acquisition Extinction (psychology) Fear organization Amygdala Functional description Mice Inbred C57BL 030104 developmental biology medicine.anatomical_structure Thalamic nucleus Memory consolidation Psychology Neuroscience 030217 neurology & neurosurgery Basolateral amygdala |
| Zdroj: | Nature Neuroscience |
| ISSN: | 1546-1726 |
| Popis: | Fear and trauma generate some of the longest-lived memories. Despite the corresponding need to understand how such memories can be attenuated, the underlying brain circuits remain unknown. Here, combining viral tracing, neuronal activity mapping, fiber photometry, chemogenetic and closed-loop optogenetic manipulations in mice, we show that the extinction of remote (30-day-old) fear memories depends on thalamic nucleus reuniens (NRe) inputs to the basolateral amygdala (BLA). We found that remote, but not recent (1-day-old), fear extinction activates NRe-to-BLA inputs, which become potentiated upon fear reduction. Furthermore, both monosynaptic NRe-to-BLA and total NRe activity increase shortly before freezing cessation, suggesting that the NRe registers and transmits safety signals to the BLA. Accordingly, pan-NRe and pathway-specific NRe-to-BLA inhibition impairs, whereas their activation facilitates, remote fear extinction. These findings identify the NRe as a crucial BLA regulator for extinction and provide the first functional description of the circuits underlying the attenuation of consolidated fear memories. Silva et al. reveal distinct circuits for the extinction of remote fear memories, with the thalamic nucleus reuniens and its outputs to the basolateral amygdala taking center stage. |
| Databáze: | OpenAIRE |
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