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Updated: Sep 26, 2025
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Taste Exam: A Brief and Validated Test
Published on: August 17, 2018
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Extra-Oral Taste Receptors-Function, Disease, and Perspectives.
1Leibniz Institute of Food Systems Biology at the Technical University of Munich, Freising, Germany.
Frontiers in Nutrition
|April 21, 2022
Summary
Human taste perception relies on receptors for salty, sour, sweet, umami, and bitter tastes. These G protein-coupled receptors (GPCRs) are also found outside the mouth, regulating digestion and metabolism.
Area of Science:
- Physiology
- Molecular Biology
- Gastroenterology
Background:
- Taste perception is vital for evaluating food, providing information on nutrients and potential toxins.
- Specialized receptor proteins in taste buds detect stimuli, with salty and sour receptors being ion channels, while sweet, umami, and bitter receptors are G protein-coupled receptors (GPCRs).
Purpose of the Study:
- To introduce human taste perception, its molecular receptors, and signal transduction pathways.
- To focus on the role of taste receptors in the gastrointestinal tract and their non-gustatory functions.
Main Methods:
- Review of existing literature on taste perception and G protein-coupled taste receptors.
- Discussion of the distribution and function of taste receptors in oral and extraoral tissues, including the gastrointestinal tract.
Main Results:
- GPCRs are involved in detecting sweet, umami, and bitter tastes.
- Taste receptors are increasingly found in tissues beyond the oral cavity, mediating crucial physiological processes.
- Gastrointestinal taste receptors play roles in metabolic regulation, hunger/satiety, digestion, and pathogen defense.
Conclusions:
- Taste receptors, particularly GPCRs, have evolved complex functions beyond taste perception.
- The presence and function of taste receptors in the gastrointestinal tract highlight their significant role in regulating bodily processes.
- Evolutionary pressures have shaped taste receptors for both gustatory and non-gustatory roles.
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