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CD49d/CD29-integrin controls the accumulation of plasmacytoid dendritic cells into the CNS during neuroinflammation.

Authors
  • Garnier, Arnaud1
  • Laffont, Sophie1
  • Garnier, Laure1
  • Kaba, Elisa2
  • Deutsch, Urban2
  • Engelhardt, Britta2
  • Guéry, Jean-Charles1
  • 1 Centre de Physiopathologie de Toulouse Purpan (CPTP), Université de Toulouse, INSERM, CNRS, UPS, Toulouse, France. , (France)
  • 2 Theodor Kocher Institute, University of Bern, Bern, Switzerland. , (Switzerland)
Type
Published Article
Journal
European Journal of Immunology
Publisher
Wiley (John Wiley & Sons)
Publication Date
Nov 01, 2019
Volume
49
Issue
11
Pages
2030–2043
Identifiers
DOI: 10.1002/eji.201948086
PMID: 31318439
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Plasmacytoid dendritic cells (pDCs) are found in the CNS during neuroinflammation and have been reported to exert regulatory functions in multiple sclerosis (MS) and its animal model experimental autoimmune encephalomyelitis (EAE). However, the mechanisms of entry of pDCs into the CNS as well as their phenotype and innate functional properties, once recruited into the CNS, have not been thoroughly examined. Herein, we show that pDCs rapidly accumulate into the brain and spinal cord during the acute phase of EAE, and maintain the expression of numerous phenotypic markers typical of peripheral pDCs. Functionally, CNS-pDCs constitutively expressed IRF7 and were able to rapidly produce type I IFNs and IL-12p40 upon ex vivo TLR-9 stimulation. Using adoptive transfer experiments, we provide evidence that CNS-pDC are recruited from the blood and accumulate into the CNS during the acute phase of EAE. Accumulation of pDCs into the CNS was strongly inhibited in the absence of CD29, but not CD18, suggesting a major role for ß1 but not ß2 integrins. Indeed, blocking the CD49d α4-integrins during acute EAE drastically diminished CNS-pDC numbers. Together, our results demonstrate that circulating pDCs are actively recruited into the CNS during acute EAE through a mechanism largely dependent on CD49d/CD29-integrins. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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