Lipopolysaccharide-induced up-regulation of activated macrophages in the degenerating taste system

Melissa Ann Cavallin, Lynnette McCluskey

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Unilateral chorda tympani (CT) nerve section and maintenance on a sodium-restricted diet leads to a rapid decrease in neurophysiological taste responses to sodium in the contralateral, intact CT nerve. Up-regulation of immune function with lipopolysaccharide (LPS; 100 μg i.p.) induces a recovery of normal sodium taste responses, suggesting that the sodium-deficient diet is immunosuppressive. In fact, there is a bilateral increase in the number of lingual, activated macrophages in control-fed rats receiving CT nerve section that does not occur in sodium-deficient rats after sectioning. In the current study, we hypothesized that the LPS-induced recovery of normal taste function in sodium-deficient rats is based on an increase in the activated macrophage response to denervation. Rats receiving a unilateral CT nerve section, a sodium-restricted diet, and/or an injection of LPS (100 μg; i.p.) were overdosed with pentobarbital at day 2 postsectioning, and tongues were rapidly dissected and frozen. Cryosections were then immunohistochemically stained to determine the percentage of ED1 staining for activated macrophages or the number of αβ or γδ cells. Activated macrophage levels were significantly increased in sodium-restricted rats that received LPS following unilateral CT nerve section, supporting our hypothesis. These novel findings suggest that LPS overcomes the immunosuppression induced by the sodium-restricted diet and also indicate that the immune system plays a role in regulating taste function after neural injury.

Original languageEnglish (US)
Pages (from-to)75-84
Number of pages10
JournalJournal of Neuroscience Research
Volume80
Issue number1
DOIs
StatePublished - Apr 1 2005

Fingerprint

Chorda Tympani Nerve
Lipopolysaccharides
Up-Regulation
Sodium
Macrophages
Sodium-Restricted Diet
Tongue
Denervation
Pentobarbital
Immunosuppressive Agents
Immunosuppression
Immune System
Cell Count
Maintenance
Staining and Labeling
Diet
Injections
Wounds and Injuries

Keywords

  • Chorda tympani nerve
  • Endotoxin
  • Neuroimmune interactions
  • T cells

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

Cite this

Lipopolysaccharide-induced up-regulation of activated macrophages in the degenerating taste system. / Cavallin, Melissa Ann; McCluskey, Lynnette.

In: Journal of Neuroscience Research, Vol. 80, No. 1, 01.04.2005, p. 75-84.

Research output: Contribution to journalArticle

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