Early-life infection leads to altered BDNF and IL-1beta mRNA expression in rat hippocampus following learning in adulthood.


Journal Article

Neonatal bacterial infection in rats leads to profound hippocampal-dependent memory impairments following a peripheral immune challenge in adulthood. Here, we determined whether neonatal infection plus an immune challenge in adult rats is associated with impaired induction of brain-derived neurotrophic factor (BDNF) within the hippocampus (CA1, CA3, and dentate gyrus) following fear conditioning. BDNF is well characterized for its critical role in learning and memory. Rats injected on postnatal day 4 with PBS (vehicle) or Escherichia coli received as adults either no conditioning or a single 2min trial of fear conditioning. Half of the rats in the conditioned group then received a peripheral injection of 25mug/kg lipopolysaccharide (LPS) and all were sacrificed 1 or 4h later. Basal (unconditioned) BDNF mRNA did not differ between groups. However, following conditioning, neonatal infection with E. coli led to decreased BDNF mRNA induction in all regions compared to PBS-treated rats. This decrease in E. coli-treated rats was accompanied by a large increase in IL-1beta mRNA in CA1. Taken together, these data indicate that early infection strongly influences the induction of IL-1beta and BDNF within distinct regions of the hippocampus, which likely contribute to observed memory impairments in adulthood.

Full Text

Cited Authors

  • Bilbo, SD; Barrientos, RM; Eads, AS; Northcutt, A; Watkins, LR; Rudy, JW; Maier, SF

Published Date

  • May 2008

Published In

Volume / Issue

  • 22 / 4

Start / End Page

  • 451 - 455

PubMed ID

  • 17997277

Pubmed Central ID

  • 17997277

Electronic International Standard Serial Number (EISSN)

  • 1090-2139

International Standard Serial Number (ISSN)

  • 0889-1591

Digital Object Identifier (DOI)

  • 10.1016/j.bbi.2007.10.003


  • eng