Toll-like receptor 2 and facial motoneuron survival after facial nerve axotomy

Derek A. Wainwright*, Junping Xin, Nichole A. Mesnard, Virginia M. Sanders, Kathryn J. Jones

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We have previously demonstrated that CD4+ Th2 lymphocytes are required to rescue facial motoneuron (FMN) survival after facial nerve axotomy through interaction with peripheral antigen presenting cells, as well as CNS resident microglia. Furthermore, the innate immune molecule, toll-like receptor 2 (TLR2), has been implicated in the development of Th2-type immune responses and can be activated by intracellular components released by dead or dying cells. The role of TLR2 in the FMN response to axotomy was explored in this study, using a model of facial nerve axotomy at the stylomastoid foramen in the mouse, in which blood-brain-barrier (BBB) permeability does not occur. After facial nerve axotomy, TLR2 mRNA was significantly upregulated in the facial motor nucleus and co-immunofluorescence localized TLR2 to CD68+ microglia, but not GFAP+ astrocytes. Using TLR2-deficient (TLR2-/-) mice, it was determined that TLR2 does not affect FMN survival levels after axotomy. These data contribute to understanding the role of innate immunity after FMN death and may be relevant to motoneuron diseases, such as amyotrophic lateral sclerosis (ALS).

Original languageEnglish (US)
Pages (from-to)10-14
Number of pages5
JournalNeuroscience Letters
Issue number1
StatePublished - Feb 26 2010


  • CNS
  • Facial motoneuron
  • Neuroprotection
  • PRR
  • TLR2

ASJC Scopus subject areas

  • Neuroscience(all)

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