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Recognition memory and DNA damage in undernourished young rats

Patrícia Molz1,2,3, Joel H Ellwanger4,5, Fernanda F Zenkner4,5

  • 1Programa de Pós-Graduação em Promoção da Saúde, Universidade de Santa Cruz do Sul/UNISC, Av. Independência, 2293, Sala 4206, Universitário, 96815-900 Santa Cruz do Sul, RS, Brasil.

Anais Da Academia Brasileira De Ciencias
|August 11, 2016
PubMed

Insights

Undernutrition in young rats did not impair recognition memory but increased hippocampal DNA damage. This caloric restriction study highlights specific impacts on brain health and memory function.

Area of Science:

  • Neuroscience
  • Toxicology
  • Nutritional Science

Background:

  • Undernutrition during development can significantly impact cognitive functions and cellular health.
  • Caloric restriction is a dietary intervention with complex effects on the body, including potential neuroprotective or neurotoxic outcomes.
  • Assessing recognition memory and DNA damage provides insight into the consequences of nutritional deficits on brain function.

Purpose of the Study:

  • To investigate the effects of undernutrition induced by caloric restriction on recognition memory in young Wistar rats.
  • To evaluate DNA damage levels in the blood and hippocampus of undernourished rats.
  • To determine the relationship between nutritional status, memory performance, and DNA integrity.

Main Methods:

  • Young Wistar rats were divided into a control group and an undernourished group subjected to 14 weeks of caloric restriction.
  • Nutritional status was confirmed by Body Mass Index (BMI) and organ weights.
  • Recognition memory was assessed using the Novel Object Recognition Test, and DNA damage was measured by the Comet Assay.
  • Statistical analyses included Student t-tests, 2-way ANOVA, and Pearson's correlation.

Main Results:

  • Undernourished rats exhibited lower BMI and organ weights compared to controls.
  • Recognition memory, both short-term and long-term, was enhanced in the undernourished group after 4 weeks and 14 weeks.
  • DNA damage was decreased in the blood but significantly increased in the hippocampus of undernourished rats.
  • A significant correlation was observed between undernutrition, enhanced memory, and hippocampal DNA damage.

Conclusions:

  • Caloric restriction-induced undernutrition in young rats did not lead to recognition memory impairment.
  • Conversely, undernutrition was associated with enhanced recognition memory performance.
  • A significant finding was the induction of DNA damage specifically within the hippocampus of undernourished rats, suggesting localized cellular stress despite improved memory.

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