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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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Related Experiment Video

Updated: May 3, 2026

Genetic Study of Axon Regeneration with Cultured Adult Dorsal Root Ganglion Neurons
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cJun promotes CNS axon growth.

Jessica K Lerch1, Yania R Martínez-Ondaro2, John L Bixby3

  • 1Department of Neuroscience, Center for Brain and Spinal Cord Repair, The Ohio State University Wexner Medical Center, 460 W 12th Ave, Columbus, OH 43210, USA; The Miami Project to Cure Paralysis, Department of Neurological Surgery, Miller School of Medicine, University of Miami, 1400 NW 12th Ave, Miami, FL 33136, USA; University of Miami, Miami, FL, 33136, USA.

Molecular and Cellular Neurosciences
|February 14, 2014
PubMed
Summary
This summary is machine-generated.

Jun oncogene (JUN) overexpression promotes central nervous system (CNS) axon growth. This CNS axon growth is independent of growth-associated genes, unlike peripheral nerve regeneration.

Keywords:
AxonCortical neuronRegenerationTranscription factorcJun

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Regenerative Medicine

Background:

  • Peripheral axon regeneration is understood, but central nervous system (CNS) axon regeneration remains a significant challenge.
  • The role of specific genes in driving CNS axon growth and regeneration is largely unexplored.
  • Identifying factors that promote CNS repair is crucial for treating neurological injuries.

Purpose of the Study:

  • To investigate whether overexpressing specific genes can stimulate neurite growth in CNS neurons.
  • To determine if combinatorial gene overexpression has a synergistic effect on CNS neuron neurite outgrowth.
  • To elucidate the molecular mechanisms underlying JUN-mediated CNS axon growth.

Main Methods:

  • Overexpression of eight transcription factors and one small GTPase in CNS neurons, both individually and in pairs.
  • Assessment of neurite growth in dissociated cortical neurons and injured cortical slices.
  • Analysis of gene expression changes, including growth associated protein 43 (GAP43) and integrin alpha 7 (ITGA7).

Main Results:

  • Combinatorial overexpression of Jun oncogene (JUN) and signal transducer and activator of transcription 6 (STAT6) enhanced neurite growth.
  • JUN overexpression alone significantly increased axon growth in injured cortical slices, comparable to the JUN/STAT6 combination.
  • JUN-induced axon growth occurred without altering the expression of GAP43 or ITGA7, which are predicted JUN targets.

Conclusions:

  • JUN activity is a key driver of axon growth in CNS cortical neurons.
  • The mechanism of JUN-mediated CNS axon growth is distinct from peripheral regeneration, as it does not require increased GAP43 expression.
  • This study highlights JUN as a potential therapeutic target for promoting CNS repair.