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Updated: May 31, 2025
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Inducing Long-Term Plasticity of Intrinsic Neuronal Excitability in Neurons of the Dorsal Lateral Geniculate Nucleus
Published on: September 20, 2024
310
Visual activity enhances neuronal excitability in thalamic relay neurons
Maël Duménieu1, Laure Fronzaroli-Molinieres1, Loïs Naudin2
1Aix-Marseille Université, INSERM, UNIS, Marseille, France.
Science Advances
|January 22, 2025
Summary
This study reveals intrinsic plasticity in the dorsal lateral geniculate nucleus (dLGN), challenging its role as a passive visual relay. Monocular deprivation alters this plasticity, offering new insights into amblyopia mechanisms.
Area of Science:
- Neuroscience
- Visual system plasticity
- Cellular excitability
Background:
- Amblyopia, a visual acuity loss, is traditionally linked to cortical plasticity.
- The dorsal lateral geniculate nucleus (dLGN) was considered a passive visual information relay.
- Emerging evidence suggests significant functional plasticity within the dLGN.
Purpose of the Study:
- To investigate the cellular mechanisms underlying dLGN plasticity.
- To explore the impact of monocular deprivation (MD) on dLGN cell excitability.
- To identify the molecular pathways involved in dLGN intrinsic plasticity.
Main Methods:
- Monocular deprivation (MD) in an experimental amblyopia model.
- Electrophysiological recordings to assess dLGN cell intrinsic excitability.
- Stimulation protocols (40 Hz) and current injection to induce plasticity.
- Calcium imaging and assessment of Kv1 channel function.
Main Results:
- Monocular deprivation reduces the intrinsic excitability of dLGN neurons.
- dLGN neurons exhibit long-term potentiation of intrinsic excitability (LTP-IE) upon specific stimulation.
- LTP-IE requires calcium influx and involves Kv1 channel downregulation.
- This plasticity is observed post-eye opening and is affected by MD.
Conclusions:
- The study provides the first evidence of intrinsic plasticity in dLGN neurons.
- Natural stimuli can induce plasticity in the dLGN.
- These findings challenge the passive relay model of the dLGN and offer new therapeutic targets for amblyopia.
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