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Cellular and Molecular Neurobiology

, Volume 30, Issue 2, pp 247–253 | Cite as

Lipopolysaccharide-Activated Microglia Induce Dysfunction of the Blood–Brain Barrier in Rat Microvascular Endothelial Cells Co-Cultured with Microglia

  • Noriko Sumi
  • Tsuyoshi Nishioku
  • Fuyuko Takata
  • Junichi Matsumoto
  • Takuya Watanabe
  • Hideki Shuto
  • Atsushi Yamauchi
  • Shinya Dohgu
  • Yasufumi Kataoka
Original Research

Abstract

The blood–brain barrier (BBB) is formed by brain capillary endothelial cells, astrocytes, pericytes, microglia, and neurons. BBB disruption under pathological conditions such as neurodegenerative disease and inflammation is observed in parallel with microglial activation. To test whether activation of microglia is linked to BBB dysfunction, we evaluated the effect of lipopolysaccharide (LPS) on BBB functions in an in vitro co-culture system with rat brain microvascular endothelial cells (RBEC) and microglia. When LPS was added for 6 h to the abluminal side of RBEC/microglia co-culture at a concentration showing no effects on the RBEC monolayer, transendothelial electrical resistance was decreased and permeability to sodium-fluorescein was increased in RBEC. Immunofluorescence staining for tight junction proteins demonstrated that zonula occludens-1-, claudin-5-, and occludin-like immunoreactivities at the intercellular borders of RBEC were fragmented in the presence of LPS-activated microglia. These functional changes induced by LPS-activated microglia were blocked by the nicotinamide adenine dinucleotide phosphate (NADPH) oxidase inhibitor, diphenyleneiodonium chloride. The present findings suggest that LPS activates microglia to induce dysfunction of the BBB by producing reactive oxygen species through NADPH oxidase.

Keywords

Blood–brain barrier Microglia Brain microvascular endothelial cells NADPH oxidase Lipopolysaccharide 

Notes

Acknowledgments

This work was supported in part by Grants-in-Aid for Scientific Research [(B) 17390159], Grants-in-Aid for Young Scientists [(Start-up) 18890227 and (Start-up) 20800066], and Grants-in-Aid for Young Scientists [(B) 19790199, (B) 21790102, (B) 21790255, (B) 21790257, and (B) 21790526] from JSPS, Japan, the Ministry of Health, Labor and Welfare of Japan (H19-nanchi-ippan-006), the Nakatomi Foundation, Research Foundation ITSUU Laboratory, and Kakihara Science and Technology Foundation.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Noriko Sumi
    • 1
  • Tsuyoshi Nishioku
    • 1
  • Fuyuko Takata
    • 1
    • 2
  • Junichi Matsumoto
    • 1
  • Takuya Watanabe
    • 1
  • Hideki Shuto
    • 1
  • Atsushi Yamauchi
    • 1
  • Shinya Dohgu
    • 1
  • Yasufumi Kataoka
    • 1
    • 2
  1. 1.Department of Pharmaceutical Care and Health Sciences, Faculty of Pharmaceutical SciencesFukuoka UniversityFukuokaJapan
  2. 2.BBB Laboratory, Pharma Co-Cell Co., Ltd.NagasakiJapan

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