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The Physiology of Taste01:24

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Related Experiment Video

Updated: Jan 17, 2026

Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds
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Parabrachial Calca Neurons Influence Aversive and Appetitive Taste Function.

Christian H Lemon1, Jinrong Li2, Md Sams Sazzad Ali2

  • 1School of Biological Sciences, University of Oklahoma, Norman, Oklahoma 73019 lemon@ou.edu.

Eneuro
|September 19, 2025
PubMed
Summary

Chemogenetic inhibition of parabrachial (PB) Calca neurons altered taste behaviors. Dampening these neurons reduced avoidance of bitter quinine and male sucrose preference, suggesting a role in taste processing.

Keywords:
CGRPCalcabehaviormouseparabrachialtaste

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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Gustation Research

Background:

  • The parabrachial (PB) nucleus integrates sensory information, with PB neurons expressing the Calca gene implicated in sensory integration.
  • Limited data exist on the specific role of PB Calca neurons in taste perception and guiding orosensory behaviors.
  • Understanding these roles is crucial for deciphering neural circuits underlying taste processing and motivated behaviors.

Purpose of the Study:

  • To investigate the impact of chemogenetically inhibiting PB Calca neurons on mouse orosensory preferences for various taste stimuli.
  • To determine if PB Calca neuron activity influences licking behavior in response to bitter, sweet, and thermal taste stimuli.
  • To explore potential sex differences in the influence of PB Calca neurons on taste-guided behaviors.

Main Methods:

  • Chemogenetic manipulation using Cre-dependent viral vectors to express the inhibitory designer receptor hM4Di:mCherry in PB Calca neurons of Calca-Cre mice.
  • Brief-access fluid exposure tests to measure licking behavior in response to quinine, cycloheximide, sucrose, and water (cool/warm).
  • Administration of clozapine-N-oxide (CNO) to activate the hM4Di receptor and assess behavioral changes compared to mCherry controls.

Main Results:

  • Inhibition of PB Calca neurons significantly reduced quinine avoidance, indicating a role in processing aversive bitter tastes.
  • Male mice with inhibited PB Calca neurons showed reduced licking preference for sucrose, suggesting a sex-specific role in appetitive taste processing.
  • No significant differences in orosensory responses to cycloheximide or thermal stimuli were observed between experimental and control groups.

Conclusions:

  • PB Calca neurons play a significant role in both aversive (bitter) and appetitive (sweet) taste-guided behaviors.
  • The contribution of PB Calca neurons to appetitive taste processing appears to be sex-dependent.
  • These findings highlight the complex involvement of PB Calca neurons in taste perception and motivated behaviors.