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Cellular Redox Imbalance and Neurochemical Effect in Cognitive-Deficient Old Rats.

Maria Elena González-Fraguela1, Lisette Blanco-Lezcano2, Caridad Ivette Fernandez-Verdecia3

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Summary

Aging impairs cognitive function by disrupting brain signaling. This study links reduced glutathione and serine levels, increased oxidative stress, and altered glutamate in aged rats to cognitive decline.

Keywords:
aginglearningmemoryneurotransmitteroxidative stressphospholipase A2serine

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Area of Science:

  • Neuroscience
  • Aging Research
  • Cognitive Science

Background:

  • Age-related cognitive decline is a growing concern.
  • Glutamatergic neurotransmission, oxidative metabolism, and serine signaling are implicated in cognitive function.

Purpose of the Study:

  • To investigate the link between dysregulated glutamatergic neurotransmission, oxidative metabolism, and serine signaling in age-related cognitive decline.
  • To evaluate the impact of natural aging on cognitive abilities in rats, specifically for hippocampal-dependent tasks.

Main Methods:

  • Assessed cognitive abilities in young and aged rats using hippocampal-dependent tasks.
  • Measured oxidative metabolism indicators: glutathione (GSH), malondialdehyde (MDA) concentrations, and cytosolic phospholipase A₂ (PLA₂) activity.
  • Quantified neurotransmitter amino acid concentrations (glutamate, GABA, serine, aspartic acid) in the frontal cortex (FC) and hippocampus (HPC).

Main Results:

  • Aged rats exhibited impaired spatial long-term memory, showing increased escape latency and reduced exploration compared to young rats.
  • Cognitive-deficient aged rats displayed decreased glutathione levels, increased MDA concentrations, and elevated PLA₂ activity in brain regions.
  • Glutamate levels increased in the hippocampus, while serine levels decreased in both the frontal cortex and hippocampus of aged rats.

Conclusions:

  • Age-related changes in redox metabolism are associated with alterations in synaptic signaling.
  • Dysregulation of glutamatergic and serine signaling, coupled with oxidative stress, contributes to cognitive impairment in aging.