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Expression of the Nrf2-system at the blood-CSF barrier is modulated by neonatal inflammation and hypoxia-ischemia

Journal article
Authors Barbara D'angelo
C. Joakim Ek
Mats Sandberg
Carina Mallard
Published in Journal of Inherited Metabolic Disease
Volume 36
Issue 3
Pages 479-490
ISSN 0141-8955
Publication year 2013
Published at Institute of Neuroscience and Physiology
Institute of Neuroscience and Physiology, Department of Physiology
Institute of Biomedicine
Pages 479-490
Language en
Links dx.doi.org/10.1007/s10545-012-9551-...
Keywords cerebrospinal-fluid, choroid-plexus, brain-injury, multidrug-resistance, heme oxygenase-1, gene-expression, nervous-system, immature brain, mouse, model, protects
Subject categories Physiology

Abstract

ORIGINAL ARTICLE Expression of the Nrf2-system at the blood-CSF barrier is modulated by neonatal inflammation and hypoxia-ischemia Barbara D ’ Angelo & C. Joakim Ek & Mats Sandberg & Carina Mallard Received: 29 May 2012 /Revised: 14 September 2012 /Accepted: 10 October 2012 /Published online: 30 October 2012 # SSIEM and Springer Science+Business Media Dordrecht 2012 Abstract Transcription factor NF-E2-related factor-2 (Nrf2) is a key regulator of endogenous anti-oxidant sys- tems shown to play a neuroprotective role in the adult by preserving blood – brain barrier function. The choroid plex- us, site for the blood-CSF barrier, has been suggested to be particularly important in maintaining brain barrier function in development. We investigated the expression of Nrf2- and detoxification-system genes in choroid plexus following systemic LPS injections, unilateral cerebral hypoxia- ischemia (HI) as well as the combination of LPS and HI (LPS/HI). Plexuses were collected at different time points after LPS, HI and LPS/HI in 9-day old mice. mRNA levels of Nrf2 and many of its target genes were analyzed by quantitative PCR. Cell death was analyzed by caspase-3 immunostaining and TUNEL. LPS caused down-regulation of the Nrf2-system genes while HI increased expression at earlier time points. LPS exposure prior to HI prevented many of the HI-induced gene increases. None of the insults resulted in any apparent cell death to choroidal epithelium. These data imply that the function of the inducible anti- oxidant system in the choroid plexus is down-regulated by inflammation, even if choroid cells are not structurally damaged. Further, LPS prevented the endogenous antioxi- dant response following HI, suggesting the possibility that the choroid plexus may be at risk if LPS is united with an insult that increases oxidative stress such as hypoxia- ischemia.

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