Abnormal differentiation of newborn granule cells in age-related working memory impairments

Myriel Nyffeler, Kay Yan Benjamin Yee, Joram Feldon, Irene Knuesel

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)

Abstract

Age-related declines in spatial memory have been linked to abnormal functional properties and connectivity of newborn granule cells. However, the relationship between adult neurogenesis, aging, and cognitive performance seems more complex than previously anticipated, likely due to the difficulty of disentangling alterations related to training as such and those associated with cognitive performance. Here, we investigated how different aspects of adult neurogenesis might be related to training, age and cognitive performance amongst aged subjects by comparing behaviourally naïve and tested rats of 3, 6, 24. mo of age. We separated aged rats into learning-impaired and -unimpaired groups based on their performance in the Morris water maze to investigate neurogenesis-related morphological and neurochemical changes. We report an age-related decline in cell proliferation and maturation independent of cognitive performance and testing. We confirm an age-related altered differentiation of newborn neurons which was particularly prominent in learning-impaired rats. This was associated with an abnormally prolonged expression of the early progenitor marker Nestin, potentially also affecting maturation, survival/integration of newborn neurons into existing neuronal networks, which might underlie the individual differences in cognitive performance during aging.
Original languageEnglish
Pages (from-to)1956-1974
Number of pages19
JournalNeurobiology of Aging
Volume31
Issue number11
DOIs
Publication statusPublished - 1 Nov 2010
Externally publishedYes

Keywords

  • Cognitive impairment
  • Dark Agouti rat
  • Doublecortin
  • Hippocampus
  • Immunohistochemistry
  • Morris water maze
  • Nestin
  • Neurogenesis
  • Stereology

ASJC Scopus subject areas

  • Ageing
  • Developmental Biology
  • Geriatrics and Gerontology
  • Clinical Neurology
  • Neuroscience(all)

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