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Related Experiment Videos

MAP2 phosphorylation and visual plasticity in Xenopus.

Y Guo1, C Sánchez, S B Udin

  • 1Department of Physiology and Biophysics, State University of New York, Buffalo, NY 14214, USA.

Brain Research
|June 26, 2001
PubMed
Summary

NMDA receptor activation dephosphorylates Microtubule-associated protein 2 (MAP2) in Xenopus, affecting cytoskeletal structure. This pathway is active across plasticity levels but doesn't determine plasticity degree.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Microtubule-associated protein 2 (MAP2) is crucial for dendritic structural changes and cytoskeletal regulation.
  • MAP2's function is phosphorylation-dependent and linked to NMDA receptor activity in synaptic plasticity.
  • The Xenopus visual system displays activity-dependent synapse rearrangement during development.

Purpose of the Study:

  • To investigate the role of MAP2 in the Xenopus visual system.
  • To examine MAP2 dephosphorylation in response to NMDA receptor activation.
  • To compare MAP2 responses in Xenopus with varying degrees of binocular plasticity.

Main Methods:

  • Utilized a phospho-specific MAP2 antibody (Ab 305) targeting the microtubule-binding domain.

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  • Administered NMDA receptor agonists to Xenopus.
  • Compared MAP2 phosphorylation levels in critical period juveniles, dark-reared adults, and normal adults.

    • Main Results:

    • NMDA receptor activation induced dose-dependent dephosphorylation of MAP2 in critical period Xenopus.
    • MAP2 dephosphorylation occurred in response to NMDA treatment across all tested groups (high and low plasticity).
    • No significant differences were observed in baseline MAP2 phosphorylation or NMDA-induced dephosphorylation between plasticity groups.

    Conclusions:

    • The NMDA receptor-MAP2-cytoskeletal protein pathway is involved in activity-dependent dendrite modification.
    • This pathway's activity does not appear to be the primary determinant of varying degrees of neural plasticity.