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Related Concept Videos

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Related Experiment Video

Updated: Apr 5, 2026

Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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Fructose consumption reduces hippocampal synaptic plasticity underlying cognitive performance.

Pedro Cisternas1, Paulina Salazar1, Felipe G Serrano1

  • 1Centro de Envejecimiento y Regeneración (CARE), Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.

Biochimica Et Biophysica Acta
|August 25, 2015
PubMed
Summary

Metabolic syndrome (MetS) negatively impacts brain function, impairing hippocampal synaptic plasticity and memory. Fortunately, these effects are reversible after discontinuing fructose consumption.

Keywords:
DiabetesFructoseMetabolic syndromeNeuronal dysfunction

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Area of Science:

  • Neuroscience
  • Metabolic Disorders
  • Neurobiology

Background:

  • Metabolic syndrome (MetS) is a widespread condition linked to diabetes and obesity.
  • The neurological impact of MetS is a growing concern, yet underlying mechanisms remain unclear.
  • Understanding MetS's effects on the brain is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the impact of a MetS-like condition on hippocampal function and cognitive performance in mice.
  • To elucidate the molecular mechanisms underlying MetS-induced brain dysfunction.
  • To assess the reversibility of MetS-related neurological deficits.

Main Methods:

  • Induced a MetS-like condition in mice through seven weeks of fructose feeding.
  • Assessed hippocampal synaptic plasticity, including long-term potentiation (LTP) and long-term depression (LTD).
  • Analyzed hippocampal neurogenesis, postsynaptic densities (PSDs), and lipid peroxidation.
  • Evaluated hippocampal-dependent learning and memory, including spatial learning and episodic memory.

Main Results:

  • Fructose feeding significantly impaired hippocampal LTP and LTD.
  • Reduced contact zones, PSD size, and neurogenesis were observed in the hippocampus.
  • Increased lipid peroxidation and impaired plasma membrane excitability were noted.
  • Cognitive deficits in spatial learning and episodic memory correlated with hippocampal dysfunction.

Conclusions:

  • Metabolic syndrome triggers molecular events disrupting hippocampal plasticity and cognitive functions.
  • Excessive fructose consumption poses risks for neurological disorders.
  • Reversal of pathological brain changes occurred three months after discontinuing fructose feeding, indicating potential for recovery.