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Immunomodulating peptides derived from different human endogenous retroviruses (HERVs) show dissimilar impact on

Shervin Bahrami1, Elzbieta Anna Gryz2, Jonas Heilskov Graversen3

  • 1Department of Clinical Medicine, Aarhus University, 8200 Aarhus N, Denmark.

Clinical Immunology (Orlando, Fla.)
|March 24, 2018
PubMed

Retroviruses including Human Endogenous Retroviruses (HERVs), contain a conserved region with highly immunomodulatory functions in the transmembrane proteins in envelope gene (env) named immunosuppressive domain (ISU). In this report, we demonstrate that Env59-GP3 peptide holds therapeutic potential in a mouse model of myelin oligodendrocyte glycoprotein (MOG)-induced experimental autoimmune encephalomyelitis (EAE). The results show that this specific HERV-H derived ISU peptide, but not peptide derived from another env gene HERV-K, decreased the development of EAE in C57BL/6 mice, accompanied by reduced demyelination and inhibition of inflammatory cells. Moreover, here we tested the effect of peptides on macrophages differentiation. The treatment with Env59-GPS peptide modulate the pro-inflammatory M1 profile and anti-inflammatory M2 macrophages, being shown by inhibiting inflammatory M1 hallmark genes/cytokines expression and enhancing expression of M2 associated markers. These results demonstrate that Env59-GP3 ISU peptide has therapeutic potential in EAE possibly through inducing the polarization of M2 macrophages and inhibiting inflammatory responses.

Keywords:
EAEEndogenous retrovirusImmunosuppression, macrophagesMSPeptide

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