期刊
NEUROSCIENCE BULLETIN
卷 38, 期 5, 页码 474-488出版社
SPRINGER
DOI: 10.1007/s12264-021-00782-w
关键词
Working memory; Ca2+ dynamics; Astrocyte; Neuron; Fiber photometry; Hippocampus
资金
- Wenzhou Medical University [89211010, 89212012]
- National Natural Science Foundation of China [81630040, 31771178, 81600991]
- Natural Science Foundation of Zhejiang Province of China [LY21H090014, LQ18C090002]
Recent studies have shown that astrocytes in the hippocampus exhibit calcium dynamics regulated by sensory inputs and reward delivery, with synchronized but phase-differing dynamics compared to neurons. Additionally, robust synchronization of astrocytic calcium dynamics at the population level was observed among the hippocampus, medial prefrontal cortex, and striatum. The inter-locked, bidirectional communication between astrocytes and neurons may play a role in modulating information processing in working memory.
Astrocytes are increasingly recognized to play an active role in learning and memory, but whether neural inputs can trigger event-specific astrocytic Ca2+ dynamics in real time to participate in working memory remains unclear due to the difficulties in directly monitoring astrocytic Ca2+ dynamics in animals performing tasks. Here, using fiber photometry, we showed that population astrocytic Ca2+ dynamics in the hippocampus were gated by sensory inputs (centered at the turning point of the T-maze) and modified by the reward delivery during the encoding and retrieval phases. Notably, there was a strong inter-locked and antagonistic relationship between the astrocytic and neuronal Ca2+ dynamics with a 3-s phase difference. Furthermore, there was a robust synchronization of astrocytic Ca2+ at the population level among the hippocampus, medial prefrontal cortex, and striatum. The inter-locked, bidirectional communication between astrocytes and neurons at the population level may contribute to the modulation of information processing in working memory.
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