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Functional Inhibition of Katanin Affects Synaptic Plasticity.

Franco L Lombino1, Jürgen R Schwarz1, Yvonne Pechmann1

  • 1Institute of Molecular Neurogenetics, Center for Molecular Neurobiology, ZMNH, University Medical Center Hamburg-Eppendorf, Falkenried 94, Hamburg 20251, Germany.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 5, 2023
PubMed
Summary

Katanin, a microtubule-severing enzyme, is crucial for synaptic plasticity. Inhibiting katanin disrupts structural spine remodeling and functional potentiation at excitatory synapses.

Keywords:
LTPNMDA receptorPSD-95dendritic spinekataninmicrotubuleneuronplasticityseveringsynapse

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Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Dynamic microtubules are vital for synaptic functions.
  • The role of microtubule severing, specifically by katanin, in synaptic processes is largely unknown.
  • Katanin is a neuronal microtubule-severing complex involved in cell division and neurogenesis.

Purpose of the Study:

  • To investigate the role of the microtubule-severing complex katanin in synaptic functions.
  • To determine if katanin activity impacts microtubule dynamics, spine structure, and synaptic plasticity.

Main Methods:

  • Studied katanin expression and localization in mouse neuronal dendrites and synapses.
  • Utilized a dominant-negative ATPase-deficient katanin subunit to inhibit severing activity.
  • Assessed effects on microtubule growth, spine density, structural remodeling (via glutamate uncaging), and synaptic potentiation (LTP induction).

Main Results:

  • Katanin is present in neuronal dendrites and excitatory spine synapses.
  • Inhibition of katanin altered dendritic microtubule growth during premature neuronal development.
  • Katanin inhibition blocked structural spine remodeling and impaired long-term potentiation (LTP) of excitatory currents.
  • Reduced microtubule invasion into mature spines was observed upon katanin inhibition.

Conclusions:

  • Katanin-mediated microtubule severing is essential for regulating structural and functional plasticity at synaptic sites.
  • Katanin plays a critical role in synaptic plasticity by controlling microtubule dynamics within dendritic spines.