Journal Article

DZNE-2026-00973

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Learning reorganizes dendritic and stabilizes axon initial segment inhibitory synapses in CA1 pyramidal neurons.

Klimmt, H. ; Kuhn, F. ; Kappel, D. ; Murthy, B. ; Ulivi, A. F. ; Argunşah, A. Ö. ; Vieweg, S. ; Huettl, R. E. ; Remy, S.DZNE* ; Attardo, A.

2026
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41467-026-77800-w

Abstract: Structural synaptic plasticity underlies the changes in brain connectivity required for learning and memory. Inhibitory synapses target all subcellular domains of excitatory pyramidal neurons, including dendrites, somata and axon initial segments. These subcellular domains have distinct molecular, structural and physiological profiles which underlie their functions. How structural plasticity of inhibitory synapses supports these functions as well as emerging properties such as memory is largely unknown. To tackle these questions we tracked inhibitory synapses on basal dendrites, somata and axon initial segments of pyramidal neurons in the dorsal hippocampal CA1 area of mice over two weeks. Size and temporal dynamics of inhibitory synapses showed a strong compartmentalization. Trace fear conditioning led to reorganization of dendritic and to stabilization of axon initial segments' inhibitory synapses. Finally, mathematical modelling allowed us to probe the mechanisms underlying stabilization of inhibitory synapses upon learning.

Keyword(s): Animals (MeSH) ; Pyramidal Cells: physiology (MeSH) ; CA1 Region, Hippocampal: physiology (MeSH) ; CA1 Region, Hippocampal: cytology (MeSH) ; Synapses: physiology (MeSH) ; Dendrites: physiology (MeSH) ; Mice (MeSH) ; Neuronal Plasticity: physiology (MeSH) ; Axon Initial Segment: physiology (MeSH) ; Learning: physiology (MeSH) ; Axons: physiology (MeSH) ; Fear: physiology (MeSH) ; Male (MeSH) ; Mice, Inbred C57BL (MeSH)

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Contributing Institute(s):

1. Neuronal Networks (AG Remy)

Research Program(s):

1. 351 - Brain Function (POF4-351) (POF4-351)

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