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Related Experiment Videos

Endocannabinoids regulate interneuron migration and morphogenesis by transactivating the TrkB receptor.

Paul Berghuis1, Marton B Dobszay, Xinyu Wang

  • 1Laboratory of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Scheeles väg 1:A1, Karolinska Institutet, S-17177 Stockholm, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|December 17, 2005
PubMed
Summary

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Perinatal cannabidiol exposure reshapes astrocyte morphology and tripartite synapse organization in a sex-dependent manner.

bioRxiv : the preprint server for biology·2026
This summary is machine-generated.

Prenatal exposure to Delta-9-THC, marijuana's active component, disrupts brain development by altering cannabinoid receptor 1 (CB1R) activity. This impacts interneuron migration and integration, potentially causing lasting cognitive deficits.

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Neuropharmacology

Background:

  • In utero exposure to Delta(9)-tetrahydrocannabinol (Delta(9)-THC) leads to cognitive deficits in adulthood.
  • The underlying neuronal mechanisms of Delta(9)-THC-induced developmental deficits are not fully understood.
  • Cannabinoid receptor 1 (CB1R) and brain-derived neurotrophic factor (BDNF) signaling pathways are crucial for neuronal development.

Purpose of the Study:

  • To investigate the role of CB1R signaling in interneuron migration and development.
  • To elucidate the mechanisms by which Delta(9)-THC affects interneuron placement and integration during corticogenesis.
  • To determine the involvement of Src kinase and TrkB receptor in endocannabinoid (eCB)-mediated interneuron development.

Main Methods:

Related Experiment Videos

  • Utilized a Boyden chamber assay to assess interneuron chemotaxis.
  • Investigated the effects of CB1R agonist stimulation on cholecystokinin-expressing interneurons.
  • Examined the role of Src kinase and TrkB receptor in eCB-induced interneuron migration and morphogenesis.
  • Analyzed the impact of prenatal Delta(9)-THC exposure on hippocampal interneuron density in vivo.

    • Main Results:

    • CB1R stimulation on cholecystokinin-expressing interneurons promotes chemotaxis, additive with BDNF.
    • Src kinase-dependent TrkB receptor transactivation mediates eCB-induced interneuron migration.
    • Endocannabinoids suppress BDNF-dependent interneuron morphogenesis, an effect reversed by Src kinase inhibition.
    • Prenatal Delta(9)-THC exposure increases hippocampal cholecystokinin-expressing interneuron density.

    Conclusions:

    • Prenatal CB1R activity is critical for the proper placement and integration of interneurons during corticogenesis.
    • Endocannabinoid signaling pathways involving TrkB receptors regulate subtype-selective interneuron migration and specification.
    • These findings highlight a potential mechanism for Delta(9)-THC-induced neurodevelopmental deficits.