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Dendritic geometry shapes neuronal cAMP signalling to the nucleus
Lu Li1, Nicolas Gervasi1, Jean-Antoine Girault1
11] Inserm, UMR-S 839, 75005 Paris, France [2] Université Pierre et Marie Curie (UPMC, Paris 6), Sorbonne Universités, 75005 Paris, France [3] Institut du Fer à Moulin, 75005 Paris, France.
Nature Communications
|February 19, 2015
Summary
Molecular signals like cAMP reach neuron nuclei via dendritic trees. Unexpectedly, signal efficacy depends on dendritic geometry, not just distance, revealing a novel signaling mechanism in neurons.
Area of Science:
- Neuroscience
- Cell Biology
- Computational Biology
Background:
- Neurons possess intricate dendritic trees receiving inputs at varying distances from the cell body.
- The mechanisms governing molecular signal propagation from dendrites to the nucleus remain largely unelucidated.
- DARPP-32 acts as a crucial phosphorylation-regulated signaling hub within striatal output neurons.
Purpose of the Study:
- To investigate the rules of cAMP-activated DARPP-32 signaling propagation from dendrites to the nucleus.
- To explore the influence of dendritic geometry on signal transmission efficiency.
Main Methods:
- Combined diffusion-reaction modeling with live imaging techniques.
- Utilized biosensor kinase activity measurements following cAMP or dopamine uncaging.
- Investigated histone 3 phosphorylation as a downstream readout.
Main Results:
- Model predicted maximal nuclear signaling effects from cAMP production in secondary dendrites, attributed to decreased dendritic diameter.
- Experimental validation confirmed that secondary dendrite stimulation yields the strongest nuclear effects.
- Dendritic geometry, rather than solely distance, was found to be a critical factor in signal efficacy.
Conclusions:
- Dendritic geometry plays a key role in modulating the efficiency of diffusion-based signaling to the nucleus.
- The study proposes a general mechanism where dendritic structure counterbalances distance effects in neuronal signaling.
- Findings challenge the inverse relationship between signaling distance and efficacy in neurons.
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