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Related Experiment Video

Updated: Apr 28, 2026

Ex Utero Electroporation and Organotypic Slice Cultures of Embryonic Mouse Brains for Live-Imaging of Migrating GABAergic Interneurons
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Cortical interneurons require Jnk1 to enter and navigate the developing cerebral cortex.

Abigail K Myers1, Daniel W Meechan2, Danielle R Adney3

  • 1Department of Neurobiology and Anatomy, Neuroscience Graduate Program, and Center for Neuroscience, West Virginia University School of Medicine, Morgantown, West Virginia 26506, and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 6, 2014
PubMed
Summary

c-Jun N-terminal kinase (JNK) signaling is crucial for guiding cortical interneuron migration into the developing mouse brain. JNK1 deficiency impairs this process, highlighting its role in neural circuit assembly.

Keywords:
GABAergic interneurondevelopmentforebrainintracellular signalingneuronal migrationpsychiatric disorder

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Signaling

Background:

  • Cortical circuitry assembly depends on precise interneuron migration.
  • Intracellular signals controlling interneuron migration remain largely unknown.

Purpose of the Study:

  • To investigate the role of c-Jun N-terminal kinase (JNK) signaling in guiding cortical interneuron migration.
  • To elucidate the specific JNK isoforms involved and their function in vivo and ex vivo.

Main Methods:

  • Ex vivo slice cultures with pharmacological JNK blockade.
  • Time-lapse imaging of migrating interneurons.
  • In vivo analysis of JNK-deficient mouse embryos (Jnk1 and Jnk2 nulls).
  • Genetic ablation of JNK in cortical interneurons.

Main Results:

  • Pharmacological JNK inhibition disrupted interneuron migration in a dose-dependent manner.
  • JNK-inhibited interneurons showed reduced speed and aberrant trajectories.
  • Jnk1 deficiency caused migration deficits, exacerbated by reduced Jnk2 levels.
  • Genetic ablation of JNK in interneurons impaired in vivo migration but not in vitro motility.

Conclusions:

  • JNK signaling, primarily mediated by JNK1, is essential for guiding cortical interneuron migration.
  • JNK acts as a guidance cue rather than a motility enhancer for interneurons.
  • This study reveals a novel role for JNK in establishing proper neural connectivity.