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Related Experiment Video

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TLR2-mediated leukocyte trafficking to the developing brain.

Amin Mottahedin1, Peter Lawrence Phillip Smith1, Henrik Hagberg2,3

  • 1Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.

Journal of Leukocyte Biology
|August 6, 2016
PubMed
Summary

Peripheral Toll-like receptor 2 (TLR2) activation specifically triggers neonatal brain inflammation and leukocyte invasion via the blood-cerebrospinal fluid barrier, not general TLR activation.

Keywords:
BBBBCSFBPAM3CSK4inflammationmeningitispleocytosis

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Area of Science:

  • Neuroscience
  • Immunology
  • Perinatal Medicine

Background:

  • Perinatal inflammation poses a significant risk for brain injury.
  • Understanding the mechanisms of neuroinflammation is crucial for developing preventative strategies.

Purpose of the Study:

  • To investigate whether peripheral Toll-like receptor (TLR) activation induces brain inflammation and leukocyte trafficking.
  • To identify specific TLR pathways involved in neonatal central nervous system (CNS) inflammation.

Main Methods:

  • Neonatal mice received intraperitoneal injections of TLR agonists (Pam3CSK4 for TLR1/2, FSL-1 for TLR2/6, LPS for TLR4).
  • Cytokine and chemokine responses were measured peripherally and centrally.
  • Immune cell infiltration into cerebrospinal fluid (CSF) and brain was assessed by flow cytometry.
  • Brain permeability was evaluated using radioactively labeled sucrose.

Main Results:

  • Peripheral Pam3CSK4 (P3C) administration induced significant leukocyte (neutrophils, monocytes) influx into the CSF and brain.
  • Leukocyte infiltration was dependent on TLR2 and MyD88, but not observed with LPS or FSL-1.
  • P3C, unlike LPS, caused distinct brain chemokine responses and increased blood-CSF barrier permeability.
  • Immune cell accumulation occurred in CNS-leukocyte gateways like the subarachnoid space and choroid plexus.

Conclusions:

  • General TLR activation does not broadly induce immune cell infiltration into the neonatal brain.
  • A specific TLR2-mediated mechanism drives CNS inflammation and leukocyte invasion in the neonatal period.
  • The blood-cerebrospinal fluid barrier is a key pathway for this peripheral-central immune interaction.