The mouse taste cell response to five sugar stimuli

Area of Science:

• Neuroscience
• Sensory Biology
• Taste Perception

Background:

• Understanding the cellular mechanisms of taste perception is crucial for deciphering sensory processing.
• Taste cells exhibit complex electrophysiological responses to various stimuli, but specific profiles for different tastants remain incompletely characterized.

Purpose of the Study:

• To investigate the electrophysiological responses and membrane resistance changes of individual mouse taste cells to different sugars and sodium chloride (NaCl).
• To determine if distinct taste cells possess characteristic response profiles for specific tastants.

Main Methods:

• Intracellular recordings were performed on mouse taste cells using glass microelectrodes filled with a fluorescent dye (procion yellow).
• Histological preparations confirmed recordings from taste buds containing fluorescent cells.
• Cells were stimulated with sucrose, four other sugars (maltose, fructose, glucose, lactose), and NaCl, while monitoring membrane potential and resistance.

Main Results:

• Sucrose stimulation elicited depolarization with either a resistance increase or no change in taste cells.
• NaCl stimulation resulted in depolarization, hyperpolarization, or null responses, accompanied by a decrease or no change in membrane resistance.
• Other tested sugars (maltose, fructose, glucose, lactose) induced depolarization or null responses with an increase or no change in membrane resistance.

Conclusions:

• Mouse taste cells display differential electrophysiological responses and membrane resistance changes to various sugars and NaCl.
• Each taste cell appears to generate characteristic response profiles and associated membrane resistance alterations for the tested stimuli, suggesting specialized cellular coding for taste quality.