Functional analysis of oral sensation on the basis of signalplexes

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Fat is one of the three major nutrients but it is not a sapid substance which activates one of the five basic tastes, sweet, bitter, sour, salt, and umami. However, we have experience that fat changes the taste of dishes largely. Transient receptor potential M5(TRPM5)channel is not a receptor of the five basic tastes but it is gated after stimulation of the gustducin-coupled receptors for sweet, bitter, and umami. We analyzed the electrophysiological and pharmacological properties of TRPM5 channel. TRPM5 channel was not activated by fatty acids, but modulated by fatty acids.