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Neurochemical Research

, Volume 43, Issue 1, pp 12–18 | Cite as

Salt Appetite, and the Influence of Opioids

  • Craig M. Smith
  • Andrew J. LawrenceEmail author
Overview

Abstract

Due to the biological importance of sodium and its relative scarcity within many natural environments, ‘salt appetite’ has evolved whereby dietary salt is highly sought after and palatable when tasted. In addition to peripheral responses, salt depletion is detected within the brain via circumventricular organs and 11β-hydroxysteroid dehydrogenase type 2 (HSD2) neurons to increase salt appetite. Salt appetite is comprised of two main components. One component is the incentive salience or motivation for salt (i.e. how much salt is ‘wanted’). Incentive salience is dynamic and largely depends on internal homeostatic conditions in combination with the detection of relevant cues. It involves the mesolimbic system and structures such as the central amygdala, and opioid signalling within these regions can increase salt intake in rodents. A second key feature is the hedonic palatability of salt (i.e. how much it is ‘liked’) when it is tasted. After detection on the tongue, gustatory information passes through the brainstem nucleus of the solitary tract and thalamus, before being consciously detected within the gustatory cerebral cortex. The positive or negative hedonic value of this stimulus is also dynamic, and is encoded by a network including the nucleus accumbens, ventral pallidum, and lateral parabrachial nucleus. Opioid signalling within these areas can alter salt intake, and ‘liking’. The overconsumption of dietary salt likely contributes to hypertension and associated diseases, and hence further characterising the role played by opioid signalling has important implications for human health.

Keywords

Salt appetite Opioids Incentive salience Palatability Reward 

Abbreviations

AT1a

Angiotensin II receptor type 1a

ACE

Angiotensin-converting enzyme

AgRP

Agouti-related peptide

CCK

Cholecystokinin

CeA

Central amygdala

CGRP

Calcitonin gene-related peptide

CN

Cranial nerve

CRF

Corticotrophin releasing factor

CVO

Circumventricular organ

DBH

Dopamine β-hydroxylase

DREADDs

Designer receptors exclusively activated by designer drugs

HSD2

11β-Hydroxysteroid dehydrogenase type 2

LPBN

Lateral parabrachial nucleus

MOR

Mu-opioid receptor

NAc

Nucleus accumbens

NTS

Nucleus of the solitary tract

PBN

Parabrachial nucleus

VP

Ventral pallidum

Notes

Acknowledgements

This research was supported by National Health and Medical Research Council of Australia Project Grant APP1079891 (to AJL) and Research Fellowship APP1116930 (to AJL), plus the Victorian Government Operational Infrastructure Support Programme.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Faculty of Health, The School of MedicineDeakin UniversityGeelongAustralia
  2. 2.The Florey Institute of Neuroscience and Mental HealthThe University of MelbourneMelbourneAustralia
  3. 3.The Florey Department of Neuroscience and Mental HealthThe University of MelbourneMelbourneAustralia

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