The ventral part of the anteromedial thalamic nucleus (AMv) is in a position to convey information to the cortico-hippocampal-amygdalar circuit involved in the processing of fear memory. Corticotropin-releasing-factor (CRF) neurons are closely associated with the regulation of stress and fear. However, few studies have focused on the role of thalamic CRF neurons in fear memory. In the present study, using a conditioned fear paradigm in CRF transgenic mice, we found that the c-Fos protein in the AMv CRF neurons was significantly increased after cued fear expression. Chemogenetic activation of AMv CRF neurons enhanced cued fear expression, whereas inhibition had the opposite effect on the cued fear response. Moreover, chemogenetic manipulation of AMv CRF neurons did not affect fear acquisition or contextual fear expression. In addition, anterograde tracing of projections revealed that AMv CRF neurons project to wide areas of the cerebral cortex and the limbic system. These results uncover a critical role of AMv CRF neurons in the regulation of conditioned fear memory.
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This work was supported by the National Natural Science Foundation of China (32000716 and 91732304), and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB02030001).
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The authors declare that there are no conflict of interest.
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Lv, Y., Chen, P., Shan, QH. et al. Regulation of Cued Fear Expression via Corticotropin-Releasing-Factor Neurons in the Ventral Anteromedial Thalamic Nucleus. Neurosci. Bull. (2020). https://doi.org/10.1007/s12264-020-00592-6
- Corticotropin-releasing-factor neurons
- Ventral anteromedial thalamic nucleus
- Cued fear expression