Related Experiment Video
Updated: Jun 14, 2026
07:40
Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds
Published on: February 11, 2021
Pharmaceutical agents targeting KATP channel modulate sweet taste sensitivity in mice
Chika Sawai1, Kuanyu Wang2, Kengo Horie3
1Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan; Department of Oral Physiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan.
The Journal of Physiological Sciences : JPS
|June 12, 2026
Summary
ATP-sensitive potassium (KATP) channel blockers reduce glucose taste sensitivity, while openers affect all sweeteners. This suggests KATP channels play distinct roles in sweet taste perception.
Area of Science:
- Neuroscience
- Sensory Biology
- Molecular Biology
Background:
- Sweet taste perception involves G-protein coupled receptors and glucose transporters.
- ATP-sensitive potassium (KATP) channels are present in taste cells and may be modulated by glucose.
- Understanding KATP channel function is crucial for elucidating sweet taste mechanisms.
Purpose of the Study:
- To investigate the impact of KATP channel modulators on mouse sweet taste behavior.
- To differentiate the roles of KATP channels in glucose transport-dependent and independent sweet taste pathways.
Main Methods:
- Administered glibenclamide (KATP channel closer) and diazoxide (KATP channel opener) to mice.
- Assessed mouse behavioral responses to various sweeteners (glucose, sucrose, sucralose) and non-sweet tastes.
Main Results:
- Glibenclamide selectively decreased sensitivity to glucose, not sucrose or sucralose.
- Diazoxide broadly reduced responses to all tested sweeteners.
- Neither drug affected responses to non-sweet taste stimuli.
Conclusions:
- Pharmacological modulation of KATP channels differentially affects sweet taste.
- KATP channel closers specifically impair glucose sensitivity, implicating transporter-dependent pathways.
- KATP channel openers broadly suppress sweet taste responses, suggesting a general role in sweet detection.
Related Concept Videos
01:24The Physiology of Taste
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 diffusion of...
01:21G-Protein Gated Ion Channels
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Sensory organs,...
01:43Gustation
Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
01:20Taste Buds and Receptors
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,...
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
01:24Non-gated Ion Channels
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.