Enhanced neuronal activation in central autonomic network nuclei in aged mice following acute peripheral immune challenge

Ronald P.A. Gaykema, Madhu K. Balachandran, Jonathan P. Godbout, Rodney W. Johnson, Lisa E. Goehler

Research output: Contribution to journalArticlepeer-review

Abstract

Infection is associated with activation in central autonomic nuclei involved in mediating coordinated host defense responses. Aged mice showed exaggerated sickness behavior following peripheral injection of pro-inflammatory bacterial lipopolysaccharide (LPS), but is unknown whether central autonomic network responses are concomitantly increased. To assess whether aged mice exhibit enhanced neural response to LPS, we compared neural responses using c-Fos immunohistochemistry in aged BALB/c mice (22-24 months) with those of young adult peers (3-6 months). Intraperitoneal LPS challenge induced robust expression of c-Fos protein in central autonomic regions, including catecholaminergic neurons in the pons and brainstem, as well as in barrier-associated areas including the circumventricular organs. The numbers of c-Fos positive neurons were significantly greater in the aged compared to the young adult mice. These findings show age-associated enhancement of response to inflammation in the blood-brain chemosensory interfaces as well the central autonomic pathways involved in the elaboration of sickness symptoms, which may contribute to exaggerated sickness and poorer outcomes of infectious disease in the elderly.

Original languageEnglish (US)
Pages (from-to)137-142
Number of pages6
JournalAutonomic Neuroscience: Basic and Clinical
Volume131
Issue number1-2
DOIs
StatePublished - Jan 30 2007

Keywords

  • Amygdala
  • Brainstem
  • Catecholaminergic neurons
  • Central autonomic network
  • Circumventricular organ
  • Hypothalamus
  • Inflammation
  • Lipopolysaccharide
  • Normal aging
  • Sickness

ASJC Scopus subject areas

  • Endocrine and Autonomic Systems
  • Clinical Neurology
  • Cellular and Molecular Neuroscience

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