Body sodium overload modulates the firing rate and fos immunoreactivity of serotonergic cells of dorsal raphe nucleus

In order to determine whether serotonergic (5HT) dorsal raphe nucleus (DRN) cells are involved in body sodium status regulation, the effect of a s.c. infusion of either 2 M or 0.15 M NaCl on 5HT DRN neuron firing was studied using single unit extracellular recordings. In separate groups of 2 M and 0...

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Veröffentlicht in:PloS one 2013-09, Vol.8 (9), p.e74689-e74689
Hauptverfasser: Godino, Andrea, Pitra, Soledad, Carrer, Hugo F, Vivas, Laura
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Carrer, Hugo F
Vivas, Laura
description In order to determine whether serotonergic (5HT) dorsal raphe nucleus (DRN) cells are involved in body sodium status regulation, the effect of a s.c. infusion of either 2 M or 0.15 M NaCl on 5HT DRN neuron firing was studied using single unit extracellular recordings. In separate groups of 2 M and 0.15 M NaCl-infused rats, water intake, oxytocin (OT) plasma concentration, urine and plasma sodium and protein concentrations were also measured. Also, to determine the involvement of particular brain nuclei and neurochemical systems in body sodium overload (SO), animals from both groups were perfused for brain immunohistochemical detection of Fos, Fos-OT and Fos-5HT expression. SO produced a significant increase in serotonergic DRN neuron firing rate compared to baseline and 0.15 M NaCl-infused rats. As expected, 2 M NaCl s.c. infusion also induced a significant increase of water intake, diuresis and natriuresis, plasma sodium concentration and osmolality, even though plasma volume did not increase as indicated by changes in plasma protein concentration. The distribution of neurons along the forebrain and brainstem expressing Fos after SO showed the participation of the lamina terminalis, extended amygdala, supraoptic and paraventricular hypothalamic nuclei in the neural network that controls osmoregulatory responses. Both Fos-OT immunoreactive and plasma OT concentration increased after s.c. hypertonic sodium infusion. Finally, matching the "in vivo" electrophysiological study, SO doubled the number of Fos-5HT immunolabeled cells within the DRN. In summary, the results characterize the behavioral, renal and endocrine responses after body sodium overload without volume expansion and specify the cerebral nuclei that participate at different CNS levels in the control of these responses. The electrophysiological approach also allows us to determine in an "in vivo" model that DRN 5HT neurons increase their firing frequency during an increase in systemic sodium concentration and osmolality, possibly to modulate sodium and water intake/excretion and avoid extracellular volume expansion.
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subjects Amygdala
Animals
Artificial neural networks
Behavior
Blood proteins
Brain
Brain stem
Central nervous system
Diuresis
Dorsal raphe nucleus
Electrophysiological recording
Excretion
Firing
Firing rate
Forebrain
Hypernatremia - physiopathology
Hypothalamus
Immunoreactivity
In vivo methods and tests
Infusion
Kidney - drug effects
Kidney - immunology
Kidney - metabolism
Kidney Function Tests
Kidneys
Laboratory animals
Male
Metabolism
Neural networks
Neurons
Nuclei (cytology)
Osmoregulation
Oxytocin
Oxytocin - immunology
Oxytocin - pharmacology
Physiology
Plasma
Proto-Oncogene Proteins c-fos - immunology
Proto-Oncogene Proteins c-fos - metabolism
Raphe nuclei
Raphe Nuclei - drug effects
Raphe Nuclei - immunology
Raphe Nuclei - metabolism
Rats
Rats, Wistar
Regulation
Rodents
Serotonin
Serotonin - immunology
Serotonin - pharmacology
Serotonin Receptor Agonists - immunology
Serotonin Receptor Agonists - pharmacology
Sodium
Sodium chloride
Sodium, Dietary - administration & dosage
Urine
Water intake
Water intakes
title Body sodium overload modulates the firing rate and fos immunoreactivity of serotonergic cells of dorsal raphe nucleus
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