Toll-like receptor 3 is a negative regulator of embryonic neural progenitor cell proliferation

Justin D. Lathia, Eitan Okun, Sung Chun Tang, Kathleen Griffioen, Aiwu Cheng, Mohamed R. Mughal, Gloria Laryea, Pradeep K. Selvaraj, Charles Ffrench-Constant, Tim Magnus, Thiruma V. Arumugam, Mark P. Mattson

Research output: Contribution to journalArticlepeer-review

153 Scopus citations


Toll-like receptors (TLRs) play important roles in innate immunity. Several TLR family members have recently been shown to be expressed by neurons and glial cells in the adult brain, and may mediate responses of these cells to injury and infection. To address the possibility that TLRs play a functional role in development of the nervous system, we analyzed the expression of TLRs during different stages of mouse brain development and assessed the role of TLRs in cell proliferation. TLR3 protein is present in brain cells in early embryonic stages of development, and in cultured neural stem/progenitor cells (NPC). NPC from TLR3-deficient embryos formed greater numbers of neurospheres compared with neurospheres from wild-type embryos. Numbers of proliferating cells, as assessed by phospho histone H3 and proliferating cell nuclear antigen labeling, were also increased in the developing cortex of TLR3-deficient mice compared with wild-type mice in vivo. Treatment of cultured embryonic cortical neurospheres with a TLR3 ligand (polyIC) significantly reduced proliferating (BrdU-labeled) cells and neurosphere formation in wild type but not TLR3 -/--derived NPCs. Our findings reveal a novel role for TLR3 in the negative regulation of NPC proliferation in the developing brain.

Original languageEnglish
Pages (from-to)13978-13984
Number of pages7
JournalJournal of Neuroscience
Issue number51
StatePublished - 17 Dec 2008
Externally publishedYes


  • Cortex
  • Embryo
  • Immunity
  • Neurogenesis
  • Stem cells
  • Ventricle


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