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Calcineurin-mediated BAD dephosphorylation activates the caspase-3 apoptotic cascade in traumatic spinal cord injury

J E Springer1, R D Azbill, S A Nottingham

  • 1Department of Anatomy and Neurobiology, University of Kentucky Medical Center, Center for Spinal Cord and Brain Injury Research, Lexington, Kentucky 40536-0084, USA.jspring@pop.uky.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 29, 2000
PubMed

Insights

Spinal cord injury triggers neuronal apoptosis via calcineurin-mediated BAD dephosphorylation, leading to caspase-3 activation. Inhibiting calcineurin or NMDA receptors prevents this process, offering potential therapeutic targets.

Area of Science:

  • Neuroscience
  • Cellular Biology
  • Molecular Biology

Background:

  • Spinal cord injury (SCI) induces neuronal apoptosis, a key factor in secondary damage.
  • The proapoptotic protein BAD plays a crucial role in regulating cell death pathways.
  • Calcineurin, a calcium-dependent phosphatase, is implicated in neuronal injury responses.

Purpose of the Study:

  • To investigate the role of calcineurin-mediated BAD dephosphorylation in caspase-3 activation following SCI.
  • To identify upstream signaling events regulating apoptosis in traumatic SCI.

Main Methods:

  • In vivo studies using an animal model of spinal cord injury.
  • Pharmacological inhibition of calcineurin (FK506) and NMDA receptors (MK801).
  • Analysis of BAD dephosphorylation, subcellular localization, and binding partners.
  • Assessment of caspase-3 activation cascade.

Main Results:

  • BAD dephosphorylation and translocation to mitochondria were observed after SCI.
  • FK506 and MK801 treatments inhibited BAD dephosphorylation and subsequent caspase-3 activation.
  • These findings demonstrate calcineurin-mediated BAD dephosphorylation as a premitochondrial event in SCI-induced apoptosis.

Conclusions:

  • Calcineurin activation, triggered by glutamate excitotoxicity, is a critical regulator of BAD dephosphorylation in SCI.
  • Targeting the calcineurin-BAD signaling pathway may offer a neuroprotective strategy for traumatic spinal cord injury.

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