Toll-like receptor 2 signaling in response to brain injury: an innate bridge to neuroinflammation

Alicia A Babcock, Martin Wirenfeldt, Thomas Holm, Helle H Nielsen, Lasse Dissing-Olesen, Henrik Toft-Hansen, Jason M Millward, Regine Landmann, Serge Rivest, Bente Finsen, Trevor Owens

Research output: Contribution to journalJournal articleResearchpeer-review


Reactive gliosis is a prominent feature of neurodegenerative and neuroinflammatory disease in the CNS, yet the stimuli that drive this response are not known. There is growing appreciation that signaling through Toll-like receptors (TLRs), which is key to generating innate responses to infection, may have pathogen-independent roles. We show that TLR2 was selectively upregulated by microglia in the denervated zones of the hippocampus in response to stereotactic transection of axons in the entorhinal cortex. In mice lacking TLR2, there were transient, selective reductions in lesion-induced expression of cytokines and chemokines. Recruitment of T cells, but not macrophages, was delayed in TLR2-deficient mice, as well as in mice lacking TNFR1 (tumor necrosis factor receptor 1). TLR2 deficiency also affected microglial proliferative expansion, whereas all of these events were unaffected in TLR4-mutant mice. Consistent with the fact that responses in knock-out mice had all returned to wild-type levels by 8 d, there was no evidence for effects on neuronal plasticity at 20 d. These results identify a role for TLR2 signaling in the early glial response to brain injury, acting as an innate bridge to neuroinflammation.
Udgivelsesdato: Dec-6
Original languageEnglish
JournalJournal of Neuroscience
Issue number49
Pages (from-to)12826-37
Number of pages11
Publication statusPublished - 6. Dec 2006


  • Animals
  • Axons
  • Brain Injuries
  • Inflammation
  • Mice
  • Mice, Inbred C3H
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Microglia
  • Neurons
  • Signal Transduction
  • Toll-Like Receptor 2

Cite this