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Synaptic synthesis, dephosphorylation, and degradation: a novel paradigm for an activity-dependent neuronal control

Paolo La Montanara1, Laura Rusconi1, Albina Locarno1

  • 1From the Department of Theoretical and Applied Sciences, Section of Biomedical Research; University of Insubria, 21052 Busto Arsizio, Italy and.

The Journal of Biological Chemistry
|January 4, 2015
PubMed

Insights

Mutations in the cyclin-dependent kinase-like 5 (CDKL5) gene cause neurodevelopmental disorders. CDKL5 levels change with neuronal activity, impacting synapse development and potentially contributing to autism spectrum disorders.

Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Mutations in the X-linked CDKL5 gene are linked to neurodevelopmental disorders like atypical Rett syndrome and autism spectrum disorders.
  • Loss of CDKL5 in mice leads to autistic-like behaviors and impaired neuronal communication.
  • CDKL5 is increasingly recognized for its role in neuronal plasticity.

Purpose of the Study:

  • To investigate the regulation of CDKL5 protein levels in response to neuronal activity.
  • To understand how CDKL5 dynamics change during neuronal development.
  • To explore the potential impact of CDKL5 dysregulation on synaptic function.

Main Methods:

  • Studied CDKL5 protein levels in neurons at different developmental stages.
  • Utilized neuronal depolarization and NMDA receptor stimulation to induce activity.
  • Investigated the roles of protein phosphatase 1 and proteasomal degradation in CDKL5 regulation.

Main Results:

  • Neuronal depolarization rapidly increases CDKL5 levels, primarily through extrasomatic synthesis.
  • In immature neurons, this increase is prolonged; in mature neurons, it is transient.
  • NMDA receptor stimulation in mature neurons triggers CDKL5 dephosphorylation and proteasomal degradation.

Conclusions:

  • Neuronal activity differentially regulates CDKL5 levels based on neuronal maturity.
  • CDKL5's dynamic regulation by neuronal activity is crucial for synaptic development and refinement.
  • CDKL5 deficiency may disrupt activity-dependent synaptic signaling, contributing to neurodevelopmental disorders.
Keywords:
CDKL5DephosphorylationLocal Protein SynthesisNeurological DiseaseNeuronal DepolarizationPost-transcriptional RegulationProtein DegradationProtein ExpressionProtein PhosphorylationSynaptic Plasticity

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