Review

The neural basis of homeostatic and anticipatory thirst

Published online:

Abstract

Water intake is one of the most basic physiological responses and is essential to sustain life. The perception of thirst has a critical role in controlling body fluid homeostasis and if neglected or dysregulated can lead to life-threatening pathologies. Clear evidence suggests that the perception of thirst occurs in higher-order centres, such as the anterior cingulate cortex (ACC) and insular cortex (IC), which receive information from midline thalamic relay nuclei. Multiple brain regions, notably circumventricular organs such as the organum vasculosum lamina terminalis (OVLT) and subfornical organ (SFO), monitor changes in blood osmolality, solute load and hormone circulation and are thought to orchestrate appropriate responses to maintain extracellular fluid near ideal set points by engaging the medial thalamic–ACC/IC network. Thirst has long been thought of as a negative homeostatic feedback response to increases in blood solute concentration or decreases in blood volume. However, emerging evidence suggests a clear role for thirst as a feedforward adaptive anticipatory response that precedes physiological challenges. These anticipatory responses are promoted by rises in core body temperature, food intake (prandial) and signals from the circadian clock. Feedforward signals are also important mediators of satiety, inhibiting thirst well before the physiological state is restored by fluid ingestion. In this Review, we discuss the importance of thirst for body fluid balance and outline our current understanding of the neural mechanisms that underlie the various types of homeostatic and anticipatory thirst.

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Acknowledgements

The authors' work is supported by a Foundation Grant from the Canadian Institutes of Health Research (CIHR, FDN 143337), an operating grant from the Heart and Stroke Foundation of Canada (G-16-00014197), a James McGill Chair to C.W.B., and a Frederick Banting and Charles Best Canada Graduate Scholarship Doctoral Award to C.G. The Research Institute of the McGill University Health Centre receives generous funding from the Fonds de Recherche Québec Santé.

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Affiliations

  1. Centre for Research in Neuroscience, Research Institute of the McGill University Health Centre and Montreal General Hospital, 1650 Cedar Avenue, Montreal H3G1A4, Canada.

    • Claire Gizowski
    •  & Charles W. Bourque

Authors

  1. Search for Claire Gizowski in:

  2. Search for Charles W. Bourque in:

Contributions

Both authors researched the data for the article, discussed its content and contributed to writing and editing the manuscript before submission.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Charles W. Bourque.

Glossary

Adipsia

Lack of thirst even under conditions that normally stimulate thirst, such as dehydration.

Vasomotor tone

The degree of tension in the smooth muscles that surround blood vessels.

Tonicity

A measure of a solution's potential to attract or repel water across a semipermeable membrane and thus generate osmotic pressure. Solutions with a higher total concentration of solutes will attract water and vice versa.

Anterior cingulate cortex

ACC. The anterior part of the cingulate cortex, which is a midline structure that lies dorsal to the corpus callosum. The ACC has a role in regulating body homeostasis and higher-order functions such as reward anticipation and decision making.

Affective motivation

Motivation to complete a task driven by a particular emotion.

Primordial emotions

Instinctive processes that drive behaviour to maintain optimal body homeostasis (for example, thirst, hunger and pain).

Insular cortex

(IC). The portion of the cerebral cortex within the lateral sulcus. It is believed to have roles in consciousness, emotions and regulating body homeostasis.

Interoceptive sensory modalities

Sensory signals related to the internal state of the body and viscera (for example, stomach distension, temperature and acidity).

Cortex

The outermost portion of the brain, thought to mediate consciousness, memory, attention, awareness, language and thought.

Prefrontal regions

The anterior portions of the brain.

Autoradiographic metabolic trapping

A method of visualizing glucose utilization in the brain. It is used as a surrogate to indicate that neurons have been electrically activated.

Immediate early gene c-Fos

A gene that is transcribed and translated transiently and rapidly in response to increased cellular calcium. Expression of an immediate early gene often indicates that neurons have been electrically activated.

Somatosensory information

Signals that encode information relating to sensory modalities such as hearing, touch and vision.

Action potentials

All-or-none electrical impulses generated at the soma of a neuron. An action potential is rapidly conducted to the axon terminal, where it can activate voltage-gated calcium channels and stimulate transmitter release onto a distinct target neuron.

Membrane potential

The electrical potential of a cell.

Organum vasculosum lamina terminalis

(OVLT). A midline brain structure located in the ventral part of the lamina terminalis and contained within the preoptic area of the hypothalamus.

Subfornical organ

(SFO). A midline brain structure that is located at the dorsal aspect of the lamina terminalis and attached to the hippocampal commissure.

Circumventricular organs

Regions of the brain that lack a blood–brain barrier, such as the organum vasculosum lamina terminalis, subfornical organ and area postrema. Neurons in these regions are directly exposed to circulating substances in the blood.

Depolarized

A term used to designate that the membrane potential of a cell has become relatively more positive. In neurons, depolarization commonly causes an increase in electrical excitability.

Median preoptic nucleus

(MnPO). A midline region of the hypothalamus that is part of the lamina terminalis and lies directly above the organum vasculosum lamina terminalis. The MnPO is thought to be an integrative nucleus involved in regulating blood pressure, fluid balance and body temperature.

Optogenetic

A technique that uses light to activate a rhodopsin channel for the purpose of causing depolarization or hyperpolarization. The rhodopsin expression is directed by genetic approaches that enable the control of specific subsets of neurons.

Chemogenetic

A technique that uses a modified G-protein receptor that is specifically activated by a unique and otherwise biologically inactive drug. Because receptor expression can be targeted to specific cells, the drug can be used to control the activity of specific subsets of neurons.

Third ventricle

One of four interconnected cavities in the brain that are filled with cerebrospinal fluid. It is a midline ventricle surrounded by the hypothalamus and thalamus.

Fibre photometry

A technique used to detect changes in fluorescence in vivo by use of an implanted fibre-optic microprobe. When targeted to neurons expressing a calcium-sensitive fluorophore, the technique can be used as a surrogate indicator of neuronal activity.

Supraoptic nucleus

(SON). A nucleus within the hypothalamus that contains magnocellular neurosecretory cells. These cells project to the posterior pituitary (neurohypophysis) and release vasopressin and oxytocin into the circulating peripheral blood.

Vagotomy

A procedure that involves removing part of the vagus nerve.

Homeotherms

Organisms that maintain their core body temperature at a stable temperature.

Euhydrated

Having a normal level of body water at rest. This condition implies an absence of absolute or relative excess hydration or dehydration.

Neurohypophysis

The posterior part of the pituitary gland that contains axon terminals originating from magnocellular neurosecretory neurons in the supraoptic nucleus and paraventricular nucleus.

Magnocellular neurosecretory neurons

Neuroendocrine neurons that synthesize either vasopressin or oxytocin within the supraoptic nucleus and paraventricular nucleus.

Active period

The last 2 h of the wake period. Animals ingest significantly more water at this time compared to the basal period.

Basal period

The 2 h period preceding the active period. During the basal period, animals ingest small volumes of water.

Whole-cell currents

Electrical currents generated by the entire cell membrane and recorded by patch clamp electrophysiology.

Negative valence

Aversive or unpleasant emotion associated with an event or condition.

Oropharyngeal afferents

Nerve fibres carrying sensory signals that originate from different tissues in the mouth or pharynx.

Trigeminal nerve

The fifth cranial nerve; it is a sensory and motor nerve that transmits information responsible for much of orofacial sensation and mediates motor functions associated with biting and chewing.

Area postrema

(AP). A midline circumventricular organ in the brain stem that is involved in the detection of circulating substances, the relay of autonomic signals and the control of emesis.