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Presynaptic phosphoprotein B-50/GAP-43 in neuronal and synaptic plasticity
J E Biewenga1, L H Schrama, W H Gispen
1Rudolf Magnus Institute for Neurosciences, Laboratory of Physiological Chemistry, Utrecht, The Netherlands.
Acta Biochimica Polonica
|January 1, 1996
Summary
Growth-associated protein B-50/GAP-43 is crucial for neuronal development and plasticity. Its phosphorylation state regulates neurotransmitter release and membrane expansion, impacting neuronal pathfinding and synaptic function.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- B-50/GAP-43 is a growth-associated phosphoprotein found in neuronal growth cones and presynaptic terminals.
- Its expression is highest in the developing nervous system and in adult brain regions with high plasticity.
Purpose of the Study:
- To investigate the role of B-50/GAP-43 in neuronal plasticity, neurite outgrowth, and transmitter release.
- To understand the regulatory mechanisms and interactions of B-50/GAP-43.
Main Methods:
- Analysis of B-50/GAP-43 gene expression and promoter activity.
- Studies on the effects of B-50/GAP-43 expression in non-neuronal cells.
- Investigation of post-translational modifications and protein interactions.
- Examination of B-50/GAP-43 phosphorylation during long-term potentiation in hippocampal slices.
Main Results:
- B-50/GAP-43 expression in non-neuronal cells promotes filopodial extensions.
- Antibodies or antisense oligonucleotides against B-50/GAP-43 inhibit neurite outgrowth.
- B-50/GAP-43 undergoes various post-translational modifications including phosphorylation and dephosphorylation.
- Increased B-50/GAP-43 phosphorylation during long-term potentiation enhances calmodulin binding and transmitter release.
Conclusions:
- B-50/GAP-43 is essential for neuronal pathfinding and neurite outgrowth.
- The phosphorylation state of B-50/GAP-43 modulates transmitter release by regulating calmodulin.
- B-50/GAP-43 plays a critical role in membrane expansion, linking neurite outgrowth and synaptic plasticity.