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Hypothalamic neuronal circuits regulating hunger-induced taste modification.

Ou Fu1,2, Yuu Iwai1, Masataka Narukawa1

  • 1Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657, Japan.

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Summary

Fasting alters taste preferences by activating specific hypothalamic neurons. These neurons modulate sweet and aversive taste perception through distinct brain pathways, optimizing feeding behavior.

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Area of Science:

  • Neuroscience
  • Sensory Systems Biology
  • Behavioral Neuroscience

Background:

  • The gustatory system evaluates food quality, but taste preferences change with internal states like hunger.
  • Mechanisms underlying hunger-induced taste modification remain largely unknown.

Purpose of the Study:

  • To investigate the neuronal mechanisms regulating hunger-induced taste modification.
  • To identify specific neural circuits involved in altering taste preferences during fasting.

Main Methods:

  • Utilized starved mice models to observe changes in taste preference and aversive taste tolerance.
  • Employed selective activation of Agouti-related peptide (AgRP)-expressing neurons in the hypothalamus.
  • Investigated downstream glutamatergic and GABAergic neurons in the lateral hypothalamus.

Main Results:

  • Starved mice showed increased preference for sweetness and tolerance for aversive tastes.
  • Selective activation of hypothalamic AgRP neurons projecting to the lateral hypothalamus mimicked these changes.
  • Glutamatergic neurons in the lateral hypothalamus, downstream of AgRP neurons, were crucial for modulating both appetitive and aversive taste preferences via distinct pathways.

Conclusions:

  • Hypothalamic circuits involving AgRP neurons and downstream lateral hypothalamic neurons are key regulators of hunger-induced taste modification.
  • Distinct neural pathways from the lateral hypothalamus to the lateral septum and lateral habenula mediate responses to appetitive and aversive tastes, respectively.
  • These findings highlight the neural basis for optimizing feeding behavior during fasting states.