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Bone morphogenetic proteins and neurotrophins provide complementary protection of septal cholinergic function during

Doris Nonner1, Kiran Panickar, Ellen F Barrett

  • 1Department of Physiology and Biophysics, University of Miami School of Medicine, Miami, Florida 33101, USA.

Journal of Neurochemistry
|September 24, 2004
PubMed

Insights

Neurotrophins and bone morphogenetic proteins protect developing neurons from okadaic acid (OA) toxicity. This combination therapy preserves neuronal function better than single treatments, even when delayed.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Okadaic acid (OA) is a potent inhibitor of protein phosphatases 1A (PP1A) and 2A (PP2A).
  • OA exposure induces significant neuronal death and cholinergic dysfunction in developing rat septal cultures.
  • Understanding protective mechanisms against neurotoxicity is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the synergistic neuroprotective effects of neurotrophins (NTs) and bone morphogenetic proteins (BMPs) against OA-induced toxicity.
  • To compare the efficacy of combined NTs and BMPs with individual treatments and a caspase inhibitor.
  • To determine the role of caspase activation in the OA-induced neurodegenerative pathway.

Main Methods:

  • Primary cultures of embryonic rat septum were exposed to OA (2-5 nM) for 24-48 hours.
  • Treatment groups included NTs (nerve growth factor + brain-derived neurotrophic factor), BMP6 or BMP7, a combination of NTs + BMPs, and a caspase inhibitor (qVD-OPH).
  • Neuronal survival, choline acetyltransferase (ChAT) activity, and tau phosphorylation were assessed post-stress.

Main Results:

  • The combination of NTs and BMPs significantly reduced neuronal death caused by OA stress.
  • NT + BMP treatment preserved choline acetyltransferase (ChAT) activity more effectively and for longer than NTs or BMPs alone.
  • The protective effects of NTs + BMPs were observed even when treatment was delayed up to 12 hours post-stress.
  • While a caspase inhibitor improved neuronal survival, its protective effect on ChAT activity was transient compared to NT + BMP treatment.
  • Neither treatment regimen reduced OA-induced tau phosphorylation.

Conclusions:

  • Neurotrophins and bone morphogenetic proteins exhibit synergistic neuroprotective effects against okadaic acid-induced stress.
  • The combined NT + BMP therapy offers superior protection of cholinergic function compared to individual trophic factors or caspase inhibition.
  • These protective mechanisms appear to operate, at least in part, upstream of caspase activation, suggesting novel therapeutic targets.

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