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Journal of Neuroinflammation
Published in: Journal of Neuroinflammation 1/2017

Open Access 01-12-2017 | Research

LPS-induced systemic inflammation reveals an immunomodulatory role for the prion protein at the blood-brain interface

Authors: Ø. Salvesen, M. R. Reiten, A. Espenes, M. K. Bakkebø, M. A. Tranulis, C. Ersdal

Published in: Journal of Neuroinflammation | Issue 1/2017

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Abstract

Background

The cellular prion protein (PrPC) is an evolutionary conserved protein abundantly expressed not only in the central nervous system but also peripherally including the immune system. A line of Norwegian dairy goats naturally devoid of PrPC (PRNP Ter/Ter) provides a novel model for studying PrPC physiology.

Methods

In order to explore putative roles for PrPC in acute inflammatory responses, we performed a lipopolysaccharide (LPS, Escherichia coli O26:B6) challenge of 16 goats (8 PRNP +/+ and 8 PRNP Ter/Ter) and included 10 saline-treated controls (5 of each PRNP genotype). Clinical examinations were performed continuously, and blood samples were collected throughout the trial. Genome-wide transcription profiles of the choroid plexus, which is at the blood-brain interface, and the hippocampus were analyzed by RNA sequencing, and the same tissues were histologically evaluated.

Results

All LPS-treated goats displayed clinical signs of sickness behavior, which were of significantly (p < 0.01) longer duration in animals without PrPC. In the choroid plexus, a substantial alteration of the transcriptome and activation of Iba1-positive cells were observed. This response included genotype-dependent differential expression of several genes associated with the immune response, such as ISG15, CXCL12, CXCL14, and acute phase proteins, among others. Activation of cytokine-responsive genes was skewed towards a more profound type I interferon response, and a less obvious type II response, in PrPC-deficient goats. The magnitude of gene expression in response to LPS was smaller in the hippocampus than in the choroid plexus. Resting state expression profiles revealed a few differences between the PRNP genotypes.

Conclusions

Our data suggest that PrPC acts as a modulator of certain pathways of innate immunity signaling, particularly downstream of interferons, and probably contributes to protection of vulnerable tissues against inflammatory damage.
Appendix
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Metadata
Title
LPS-induced systemic inflammation reveals an immunomodulatory role for the prion protein at the blood-brain interface
Authors
Ø. Salvesen
M. R. Reiten
A. Espenes
M. K. Bakkebø
M. A. Tranulis
C. Ersdal
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2017
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/s12974-017-0879-5

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