Detection, modulation, and transmission of sweet taste in regulation for energy homeostasis

  • Jyotaki, Masafumi (Section of Oral Neuroscience, Kyushu University, Graduate School of Dental Sciences) ;
  • Ninomiya, Yuzo (Section of Oral Neuroscience, Kyushu University, Graduate School of Dental Sciences)
  • Published : 2009.06.30

Abstract

Perception of sweet compounds is important for animals to detect external carbohydrate source of calories and plays a crucial role in feeding behavior of animals. Recent progress in molecular genetic studies provides evidence for a candidate receptor (heterodimers with taste receptor type 1 member 2 and 3: T1R2/T1R3), and major downstream transduction molecules required for sweet taste signaling. Several studies demonstrated that the sweet taste signal can be modulated by a satiety hormone, leptin, through its receptors expressed in a subset of sweet-sensitive taste cells. Increase of internal energy storage in the adipose tissue leads to increase in the plasma leptin level which can reduce activities of sweet-sensitive cells. In human, thus, diurnal variation of plasma leptin level parallels variation of taste recognition thresholds for sweet compounds. This leptin modulation of sweet taste sensitivity may influence individuals' preference, ingestive behavior, and absorption of nutrients, thereby plays important roles in regulation of energy homeostasis.

Keywords

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