Astrocytes in CA1 modulate schema establishment in the hippocampal-cortical neuron network

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Heung Yan Wong
  • Li Xie
  • Yuk Yan Lam
  • Aruna Surendran Ramkrishnan

Detail(s)

Original languageEnglish
Article number250
Journal / PublicationBMC Biology
Volume20
Online published10 Nov 2022
Publication statusPublished - 2022

Link(s)

Abstract

Background: Schema, a concept from cognitive psychology used to explain how new information is integrated with previous experience, is a framework of acquired knowledge within associative network structures as biological correlate, which allows new relevant information to be quickly assimilated by parallel cortical encoding in the hippocampus (HPC) and cortex. Previous work demonstrated that myelin generation in the anterior cingulate cortex (ACC) plays a critical role for dynamic paired association (PA) learning and consolidation, while astrocytes in ACC play a vital role in cognitive decision-making. However, circuit components and mechanism involving HPC-anterior cingulate cortex (ACC) during schema formation remain uncertain. Moreover, the correlation between HPC-ACC circuit and HPC astrocytic activity is unclear. Results: Utilizing a paired association (PA) behavioral paradigm, we dynamically recorded calcium signals of CA1-ACC projection neurons and ACC neurons during schema formation. Depending on the characteristics of the calcium signals, three distinct stages of schema establishment process were identified. The recruitment of CA1-ACC network was investigated in each stage under CA1 astrocytes Gi pathway chemogenetic activation. Results showed that CA1-ACC projecting neurons excitation gradually decreased along with schema development, while ACC neurons revealed an excitation peak in the middle stage. CA1 astrocytic Gi pathway activation will disrupt memory schema development by reducing CA1-ACC projection neuron recruitment in the initial stage and prevent both CA1-ACC projection neurons and ACC neuron excitation in the middle stage. CA1 astrocytes Gi markedly suppress new PA assimilation into the established memory schema. Conclusions: These results not only reveal the dynamic feature of CA1-ACC network during schema establishment, but also suggest CA1 astrocyte contribution in different stages of schema establishment.

Research Area(s)

  • Anterior cingulate cortex, Astrocyte, Calcium imaging, Chemogenetics, Hippocampus, Schema

Citation Format(s)

Astrocytes in CA1 modulate schema establishment in the hippocampal-cortical neuron network. / Liu, Shu; Wong, Heung Yan; Xie, Li et al.
In: BMC Biology, Vol. 20, 250, 2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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