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Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
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Hunger and thirst are fundamental physiological drives crucial for maintaining homeostasis and ensuring the survival of both humans and animals. These drives are regulated through complex interactions between the brain, hormones, and sensory receptors.
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TMEM63B functions as a mammalian hyperosmolar sensor for thirst.

Wenjie Zou1, Siqi Deng2, Xingyu Chen3

  • 1Department of Neurobiology, School of Basic Medicine, Capital Medical University, Beijing, China; Institute of Molecular Physiology, Shenzhen Bay Laboratory, Shenzhen, China.

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|March 19, 2025
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Summary

Researchers identified TMEM63B as a key molecular sensor for thirst in mammals. This protein, found in the subfornical organ, detects changes in blood osmolality, triggering the sensation of thirst.

Keywords:
SFOTMEM63Bhyperosmosensitiveinteroceptionmechanically gated ion channelosmolaritysensory receptorsthirstwater homeostasis

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Area of Science:

  • Neuroscience
  • Physiology
  • Molecular Biology

Background:

  • Thirst is a vital physiological drive essential for maintaining water balance (homeostasis).
  • The subfornical organ (SFO) in the brain is implicated in sensing blood osmolality to induce thirst.
  • The specific molecular sensor responsible for detecting hyperosmolality in the SFO has remained unidentified.

Purpose of the Study:

  • To identify the molecular sensor responsible for detecting high blood osmolality and triggering thirst.
  • To investigate the role of TMEM63B in mediating thirst responses in the SFO.

Main Methods:

  • Utilized knockout mouse models (Tmem63b knockout) to assess behavioral deficits in thirst.
  • Performed electrophysiological recordings on SFO neurons expressing TMEM63B to analyze responses to hypertonic stimuli.
  • Examined the function of purified TMEM63B in liposomes to confirm osmolarity-gated channel activity.
  • Genetically manipulated TMEM63B expression specifically within SFO neurons.

Main Results:

  • TMEM63B is expressed in excitatory neurons of the SFO and is crucial for neuronal responses to hypertonic conditions.
  • Heterologous expression of TMEM63B demonstrated activation by hypertonic stimuli, with mutations affecting channel properties.
  • Purified TMEM63B reconstituted in liposomes exhibited currents gated by changes in osmolarity.
  • Tmem63b knockout mice displayed significant impairments in thirst behavior, which were replicated by deleting TMEM63B solely in SFO neurons.

Conclusions:

  • TMEM63B functions as a molecular sensor for hyperosmolality in the mammalian SFO.
  • This discovery provides a molecular basis for the sensation of thirst.
  • TMEM63B represents a critical component in the neural circuitry regulating water intake and homeostasis.