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Growth-regulated proteins and neuronal plasticity. A commentary
K H Pfenninger1, B A de la Houssaye, S M Helmke
1Department of Cellular and Structural Biology, University of Colorado School of Medicine, Denver 80262.
Molecular Neurobiology
|January 1, 1991
Summary
Growth-regulated proteins (GRPs) are markers of neuronal growth. Their continued presence and changes, like phosphorylation, may indicate sprouting activity underlying synaptic plasticity and memory.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Growth-regulated proteins (GRPs) are synthesized during neuronal outgrowth and regeneration.
- GRPs are enriched in growth cones and can serve as neurite growth markers.
- The precise function of GRPs in neuronal outgrowth is not fully understood.
Purpose of the Study:
- To explore the role of GRPs in synaptic plasticity.
- To propose a hypothesis for trophic factor involvement in synaptic size regulation and sprouting.
- To link GRP changes to plasticity and learning mechanisms.
Main Methods:
- Analysis of GRP abundance during neuronal development and synaptogenesis.
- Investigation of GRP changes, such as phosphorylation, during long-term potentiation (LTP).
- Correlation of GRP expression patterns with synaptic plasticity and learning phenomena.
Main Results:
- GRPs decrease during synaptogenesis but overlap with synaptic properties.
- Certain GRPs, like GAP43, are prominent in plastic adult brain regions.
- Phosphorylation of GRPs occurs during LTP.
Conclusions:
- The overlap between growth cone and synaptic properties, involving GRPs, may underlie synaptic plasticity.
- Changes in GRPs likely indicate sprouting activity, explaining plasticity and learning.
- Synaptic plasticity and memory can be viewed as a continuation of developmental processes.