Hormonal enhancement of neuronal firing is linked to structural remodelling of excitatory and inhibitory synapses

A. Párducz, Z. Hoyk, Z. Kis, L. M. Garcia-Segura

Research output: Article

36 Citations (Scopus)

Abstract

The ovarian hormone estradiol induces morphological changes in the number of synaptic inputs in specific neuronal populations. However, the functional significance of these changes is still unclear. In this study, the effect of estradiol on the number of anatomically identified synaptic inputs has been assessed in the hypothalamic arcuate nucleus. The number of axo-somatic, axodendritic and spine synapses was evaluted using unbiased stereological methods and a parallel electrophysiological study was performed to assess whether synaptic anatomical remodelling has a functional consequence on the activity of the affected neurons. Estradiol administration to ovariectomized rats induced a decrease in the number of inhibitory synaptic inputs, an increase in the number of excitatory synapses and an enhancement of the frequency of neuronal firing. These results indicate that oestrogen modifications in firing frequency in arcuate neurons are temporally linked to anatomical modifications in the numerical balance of inhibitory and excitatory synaptic inputs.

Original languageEnglish
Pages (from-to)665-670
Number of pages6
JournalEuropean Journal of Neuroscience
Volume16
Issue number4
DOIs
Publication statusPublished - 2002

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Synapses
Estradiol
Neurons
Arcuate Nucleus of Hypothalamus
Estrogens
Spine
Hormones
Population

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

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title = "Hormonal enhancement of neuronal firing is linked to structural remodelling of excitatory and inhibitory synapses",
abstract = "The ovarian hormone estradiol induces morphological changes in the number of synaptic inputs in specific neuronal populations. However, the functional significance of these changes is still unclear. In this study, the effect of estradiol on the number of anatomically identified synaptic inputs has been assessed in the hypothalamic arcuate nucleus. The number of axo-somatic, axodendritic and spine synapses was evaluted using unbiased stereological methods and a parallel electrophysiological study was performed to assess whether synaptic anatomical remodelling has a functional consequence on the activity of the affected neurons. Estradiol administration to ovariectomized rats induced a decrease in the number of inhibitory synaptic inputs, an increase in the number of excitatory synapses and an enhancement of the frequency of neuronal firing. These results indicate that oestrogen modifications in firing frequency in arcuate neurons are temporally linked to anatomical modifications in the numerical balance of inhibitory and excitatory synaptic inputs.",
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T1 - Hormonal enhancement of neuronal firing is linked to structural remodelling of excitatory and inhibitory synapses

AU - Párducz, A.

AU - Hoyk, Z.

AU - Kis, Z.

AU - Garcia-Segura, L. M.

PY - 2002

Y1 - 2002

N2 - The ovarian hormone estradiol induces morphological changes in the number of synaptic inputs in specific neuronal populations. However, the functional significance of these changes is still unclear. In this study, the effect of estradiol on the number of anatomically identified synaptic inputs has been assessed in the hypothalamic arcuate nucleus. The number of axo-somatic, axodendritic and spine synapses was evaluted using unbiased stereological methods and a parallel electrophysiological study was performed to assess whether synaptic anatomical remodelling has a functional consequence on the activity of the affected neurons. Estradiol administration to ovariectomized rats induced a decrease in the number of inhibitory synaptic inputs, an increase in the number of excitatory synapses and an enhancement of the frequency of neuronal firing. These results indicate that oestrogen modifications in firing frequency in arcuate neurons are temporally linked to anatomical modifications in the numerical balance of inhibitory and excitatory synaptic inputs.

AB - The ovarian hormone estradiol induces morphological changes in the number of synaptic inputs in specific neuronal populations. However, the functional significance of these changes is still unclear. In this study, the effect of estradiol on the number of anatomically identified synaptic inputs has been assessed in the hypothalamic arcuate nucleus. The number of axo-somatic, axodendritic and spine synapses was evaluted using unbiased stereological methods and a parallel electrophysiological study was performed to assess whether synaptic anatomical remodelling has a functional consequence on the activity of the affected neurons. Estradiol administration to ovariectomized rats induced a decrease in the number of inhibitory synaptic inputs, an increase in the number of excitatory synapses and an enhancement of the frequency of neuronal firing. These results indicate that oestrogen modifications in firing frequency in arcuate neurons are temporally linked to anatomical modifications in the numerical balance of inhibitory and excitatory synaptic inputs.

KW - Arcuate nucleus 17 β-estradiol

KW - GABA

KW - Neuronal activity

KW - Rat

KW - Synaptic plasticity

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