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Updated: Dec 6, 2025

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Short-term high-fat feeding induces a reversible net decrease in synaptic AMPA receptors in the hypothalamus.

Jianfeng Liu1, Stoyan Dimitrov2, Anuck Sawangjit1

  • 1Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany.

The Journal of Nutritional Biochemistry
|October 6, 2020
PubMed
Summary
This summary is machine-generated.

Short-term high-fat diets rapidly reduce synaptic strength in the hypothalamus, affecting AMPA receptors (a type of glutamate receptor). These changes are reversible with normal feeding, suggesting a new target for metabolic control.

Keywords:
AMPA receptor signalingCortexHigh-fat dietHypothalamusSleep/wakefulnessSynaptic plasticity

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Area of Science:

  • Neuroscience
  • Metabolic Research
  • Synaptic Plasticity

Background:

  • Dietary obesity is known to impair brain function.
  • The specific effects of high-fat diets on hypothalamic synaptic transmission and their reversibility remain unclear.
  • Understanding these changes is crucial for addressing metabolic disorders.

Purpose of the Study:

  • To investigate the impact of high-fat feeding on glutamatergic synaptic plasticity in the hypothalamus.
  • To examine the expression and phosphorylation of AMPA receptor subunits (GluA1 and GluA2).
  • To determine the reversibility of these synaptic changes following a return to a normal diet.

Main Methods:

  • Male rats were fed a high-fat diet (HFD) for one or three days.
  • Synaptoneurosomes from hypothalamic and cortical tissues were analyzed for AMPA receptor subunit levels and phosphorylation.
  • A recovery group received a three-day HFD followed by four days of normal chow.

Main Results:

  • Three days of HFD, but not one day, decreased hypothalamic AMPA receptor GluA1 and GluA2 subunit levels and GluA1 phosphorylation.
  • These suppressive effects were specific to the hypothalamus and not observed in the cortex.
  • The HFD-induced changes in hypothalamic AMPA receptor expression and phosphorylation were reversed by normal chow feeding.

Conclusions:

  • Short-term high-fat feeding reversibly down-regulates glutamatergic synaptic strength in the hypothalamus.
  • This rapid synaptic alteration precedes obesity and may represent a counter-regulatory mechanism.
  • Targeting these hypothalamic synaptic changes could offer new strategies for improving metabolic control.