Glucose regulation of memory for reward reduction in young and aged rats

Juan A. Salinas, Paul Ernest Gold

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Although baseline blood glucose levels in aged Fischer-344 rats are comparable to those of young rats, the rise in blood glucose in response to training-related stress is substantially attenuated. The diminished response may contribute to increased depletion of extracellular brain glucose levels during training in aged rats; the depletion is blocked and memory is enhanced by systemic injections of glucose. The present experiment examined the role of glucose in regulating memory for reward reduction training. Blood glucose levels exhibited a significant rise after reward reduction trials in young adult but not 2-year-old rats. Although young and aged rats exhibited comparable learning during the day of reward reduction training, aged rats exhibited more rapid forgetting of the learning response. Post-training glucose injections (200 mg/kg, i.p.) facilitated memory formation and slowed the rate of forgetting in young and old rats, consistent with the view that deficiencies in circulating glucose responses to training may contribute to the rapid forgetting evident in aged Fischer-344 rats.

Original languageEnglish (US)
Pages (from-to)45-52
Number of pages8
JournalNeurobiology of Aging
Volume26
Issue number1
DOIs
StatePublished - Jan 2005
Externally publishedYes

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Keywords

  • Aging
  • Behavioral contrast
  • Crespi effect
  • Forgetting
  • Frustration
  • Glucose
  • Memory
  • Reward

ASJC Scopus subject areas

  • Clinical Neurology
  • Biological Psychiatry
  • Developmental Neuroscience
  • Neurology
  • Psychology(all)

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