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Nitric Oxide-Dependent LTD at Infralimbic Cortex.

José Antonio Noriega-Prieto¹, Laura Eva Maglio², Yasir Gallero-Salas³

¹Departamento de Anatomía, Histología y Neurociencia, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, 28029, Spain.

|August 27, 2019

Summary

Dendritic calcium spikes in rat infralimbic cortex layer 5 pyramidal neurons induce synaptic plasticity. This process, crucial for fear memory extinction, involves nitric oxide-dependent presynaptic long-term depression.

Keywords:

L-type VGCC NMDARs calcium spikes dendritic excitability nitric oxide prefrontal cortex

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Area of Science:

Neuroscience
Synaptic Plasticity
Molecular Mechanisms

Background:

Dendritic calcium (Ca²⁺) spikes are vital for long-term synaptic plasticity.
Synaptic plasticity in the infralimbic cortex is essential for fear memory extinction.
The specific role of Ca²⁺ spikes in infralimbic cortex synaptic plasticity remains underexplored.

Purpose of the Study:

To investigate the role of Ca²⁺ spikes in inducing synaptic plasticity in the rat infralimbic cortex.
To elucidate the mechanisms underlying Ca²⁺ spike-mediated synaptic plasticity in layer 5 pyramidal neurons.

Main Methods:

Electrophysiological recordings from layer 5 pyramidal neurons (L5 PNs) in rat infralimbic cortex slices.
Manipulation of intracellular calcium levels using BAPTA.
Assessment of nitric oxide (NO) signaling pathways using L-NAME.

Main Results:

Ca²⁺ spikes in L5 PNs are critical for inducing long-term depression (LTD) of excitatory postsynaptic currents (EPSCs).
LTD induction requires intracellular calcium elevation and is mediated by a presynaptic mechanism.
The process is dependent on nitric oxide (NO) synthesis.

Conclusions:

Ca²⁺ spikes trigger a NO-dependent, presynaptic form of LTD in the infralimbic cortex.
This study reveals a novel mechanism for inducing synaptic plasticity in L5 PNs.
Findings contribute to understanding the neural basis of fear memory extinction.