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Related Experiment Videos

Phosphorylation of CREB in axon-induced Schwann cell proliferation.

M M Lee1, A Badache, G H DeVries

  • 1Mental Retardation Research Center, Department of Neurobiology, University of California School of Medicine, Los Angeles, USA.

Journal of Neuroscience Research
|April 29, 1999
PubMed
Summary
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Axonal contact drives Schwann cell proliferation via CREB phosphorylation. Protein kinase A and C pathways are crucial, with PKC potentially acting downstream of CREB activation.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Axonal contact is known to regulate Schwann cell (SC) proliferation during development.
  • Intracellular signaling pathways mediating axon-induced SC proliferation remain largely undescribed.

Purpose of the Study:

  • To elucidate the signal transduction pathways involved in axon-induced Schwann cell proliferation.
  • To investigate the role of CREB phosphorylation in SC proliferation.

Main Methods:

  • Utilized axolemma-enriched fractions (AEF) and dorsal root ganglion neurites to stimulate SCs.
  • Monitored CREB phosphorylation using immunocytochemistry and Western blot analysis.
  • Assessed SC proliferation following inhibition of protein kinase A (PKA) and protein kinase C (PKC).

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Main Results:

  • AEF stimulation significantly increased phosphorylated CREB levels over 48 hours.
  • PKA inhibition completely abolished both CREB activation and SC proliferation.
  • PKC inhibition reduced SC proliferation but did not immediately impact CREB phosphorylation.

Conclusions:

  • Both PKA and PKC signaling pathways are essential for AEF-induced SC proliferation.
  • PKC may regulate SC proliferation through pathways downstream of immediate CREB activation.