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Purification of the Dendritic Filopodia-rich Fraction
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Activity-dependent dendritic elaboration requires Pten.

Patrick D Skelton1, Jessie Poquerusse1, Julia R Salinaro1

  • 1Department of Molecular and Systems Biology, Dartmouth Geisel School of Medicine, Hanover, NH 03755, United States.

Neurobiology of Disease
|December 16, 2019
PubMed
Summary
This summary is machine-generated.

Loss of the Pten gene, linked to autism, impairs activity-dependent dendritic growth in developing neurons. Enhancing network activity accelerates growth in wild-type but not Pten knockout neurons, highlighting Pten's role in neuronal development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • The phosphatase and tensin homolog (Pten) gene is crucial for regulating cell growth and survival.
  • Pten plays a role in intracellular signaling pathways that influence neuronal development and plasticity.
  • Alterations in Pten are implicated in neurodevelopmental disorders, including autism spectrum disorder.

Purpose of the Study:

  • To investigate the role of Pten in activity-dependent dendritic growth during neuronal maturation.
  • To determine if Pten loss affects the ability of developing neurons to respond to network activity.
  • To examine the impact of Pten on synaptic connectivity and physiological maturation of neurons.

Main Methods:

  • Utilized retroviral labeling to track postnatal granule neurons in wild-type and Pten knockout mice.
  • Employed chemogenetics to manipulate the activity of perforant path afferents.
  • Assessed dendritic outgrowth, synaptic connectivity, input resistance, membrane capacitance, dendritic spine morphology, and spontaneous synaptic event frequency.

Main Results:

  • Enhanced network activity accelerated dendritic outgrowth in wild-type neurons but not in Pten knockout neurons.
  • This activity-dependent dendritic growth effect was specific to immature neurons during an early developmental window.
  • No differential alterations in input resistance, membrane capacitance, spine morphology, or synaptic event frequency were observed between wild-type and Pten knockout neurons in response to activity manipulation.

Conclusions:

  • Pten signaling is essential for regulating the activity-dependent sculpting of the dendritic arbor during neuronal maturation.
  • Pten loss disrupts the normal response of developing neurons to network activity, impacting dendritic development.
  • These findings provide insights into the molecular mechanisms underlying Pten's contribution to neurodevelopmental processes.