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Journal of Translational Medicine
Published in: Journal of Translational Medicine 1/2014

Open Access 01-12-2014 | Research

Diminished humoral responses against and reduced gene expression levels of human endogenous retrovirus-K (HERV-K) in psoriasis

Authors: Rashmi Gupta, Henri-Alexandre Michaud, Xue Zeng, Maya Debbaneh, Sarah T Arron, R Brad Jones, Christopher E Ormsby, Douglas F Nixon, Wilson Liao

Published in: Journal of Translational Medicine | Issue 1/2014

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Abstract

Background

Psoriasis is a multifactorial, chronic disease of skin affecting 2-3% of the world’s population. Genetic studies of psoriasis have identified a number of susceptibility genes that are involved in anti-viral immunity. Furthermore, physiological studies have also found an increase in anti-viral proteins in psoriatic skin. These findings suggest the presence of an anti-viral state in psoriatic skin. However, the triggers for this anti-viral cascade and its consequences for host immunity are not known. Endogenous retroviruses have previously been described in many autoimmune diseases including psoriasis.

Methods

In the present study we examined the humoral immune response against human endogenous retrovirus-K (HERV-K) proteins and the cutaneous expression levels of multiple HERV-K genes in psoriasis patients and healthy controls.

Results

In psoriatic sera we observed a significant decrease in IgM response against three HERV-K proteins: Env surface unit (SU), Env transmembrane protein (TM), and Gag capsid (CA) in comparison to sera obtained from blood bank healthy controls. A decrease in IgG response was also observed against CA. Furthermore, using quantitative RT-PCR we observed a decrease in the expression of HERV-K Env, Gag, Pol and Rec as well as ERV-9 genes in lesional psoriatic skin as compared to healthy skin.

Conclusions

Together, our results suggest that the pro-inflammatory, anti-viral state in psoriasis is associated with diminished expression of HERV-K gene transcripts and a concomitant decrease in humoral responses to HERV-K. Our results indicate that a simple model where continuous, minimally changing HERV-K expression serves as an antigenic trigger in psoriasis might not be correct and further studies are needed to decipher the possible relationship between psoriasis and HERVs.
Appendix
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Metadata
Title
Diminished humoral responses against and reduced gene expression levels of human endogenous retrovirus-K (HERV-K) in psoriasis
Authors
Rashmi Gupta
Henri-Alexandre Michaud
Xue Zeng
Maya Debbaneh
Sarah T Arron
R Brad Jones
Christopher E Ormsby
Douglas F Nixon
Wilson Liao
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2014
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/s12967-014-0256-4

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