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Neuronal activation of Ras regulates synaptic connectivity
Thomas Arendt1, Ulrich Gärtner, Gudrun Seeger
1Paul Flechsig Institute of Brain Research, Department of Neuroanatomy, University of Leipzig, D-04109 Leipzig, Germany. aret@medizin.uni-leipzig.de
The European Journal of Neuroscience
|June 9, 2004
Summary
Neuronal Ras signaling sculpts adult brain connectivity by altering neuronal structure and synaptic function. This Ras-MAPK pathway activation enhances synaptic plasticity and excitability, impacting neuronal architecture and efficacy.
Area of Science:
- Neuroscience
- Cellular Biology
- Molecular Biology
Background:
- Ras-MAPK signaling is crucial for cell growth and differentiation.
- Its role in mature neuronal connectivity and plasticity is not fully understood.
Purpose of the Study:
- To investigate the function of Ras-MAPK signaling in adult neuronal connectivity.
- To elucidate the structural and functional consequences of enhanced Ras activity in differentiated neurons.
Main Methods:
- Generated a synRas mouse model with constitutively activated Ha-Ras in neurons.
- Utilized postnatal organotypic cultures and acute brain slices for electrophysiological recordings.
- Performed whole-cell patch-clamp and extracellular field potential recordings.
Main Results:
- Enhanced Ras activity increased neuronal soma size and dendritic arborization.
- Dendritic spine density and synaptic number were elevated, increasing basal excitability.
- Synaptic plasticity, including long-term potentiation, was enhanced, with presynaptic involvement.
Conclusions:
- Neuronal Ras acts as a key regulator of plasticity in the adult mammalian brain.
- It influences neuronal architecture, synaptic connectivity, and synaptic efficacy.
- Ras-MAPK signaling is a critical determinant of neuronal structure and function in the adult brain.