Protection from experimental autoimmune encephalomyelitis by polyclonal IgG requires adjuvant-induced inflammation


Autoria(s): Quast, Isaak; Keller, Christian W; Weber, Patrick; Schneider, Christoph; von Gunten, Stephan; Lünemann, Jan D
Data(s)

2016

Resumo

BACKGROUND Intravenous immunoglobulin (IVIG) proved to be an efficient anti-inflammatory treatment for a growing number of neuroinflammatory diseases and protects against the development of experimental autoimmune encephalomyelitis (EAE), a widely used animal model for multiple sclerosis (MS). METHODS The clinical efficacy of IVIG and IVIG-derived F(ab')2 fragments, generated using the streptococcal cysteine proteinase Ide-S, was evaluated in EAE induced by active immunization and by adoptive transfer of myelin-specific T cells. Frequency, phenotype, and functional characteristics of T cell subsets and myeloid cells were determined by flow cytometry. Antibody binding to microbial antigen and cytokine production by innate immune cells was assessed by ELISA. RESULTS We report that the protective effect of IVIG is lost in the adoptive transfer model of EAE and requires prophylactic administration during disease induction. IVIG-derived Fc fragments are not required for protection against EAE, since administration of F(ab')2 fragments fully recapitulated the clinical efficacy of IVIG. F(ab')2-treated mice showed a substantial decrease in splenic effector T cell expansion and cytokine production (GM-CSF, IFN-γ, IL-17A) 9 days after immunization. Inhibition of effector T cell responses was not associated with an increase in total numbers of Tregs but with decreased activation of innate myeloid cells such as neutrophils, monocytes, and dendritic cells. Therapeutically effective IVIG-derived F(ab')2 fragments inhibited adjuvant-induced innate immune cell activation as determined by IL-12/23 p40 production and recognized mycobacterial antigens contained in Freund's complete adjuvant which is required for induction of active EAE. CONCLUSIONS Our data indicate that F(ab')2-mediated neutralization of adjuvant contributes to the therapeutic efficacy of anti-inflammatory IgG. These findings might partly explain the discrepancy of IVIG efficacy in EAE and MS.

Formato

application/pdf

Identificador

http://boris.unibe.ch/81913/1/vonGunten_Protection%20from%20experimental%20autoimmune.pdf

Quast, Isaak; Keller, Christian W; Weber, Patrick; Schneider, Christoph; von Gunten, Stephan; Lünemann, Jan D (2016). Protection from experimental autoimmune encephalomyelitis by polyclonal IgG requires adjuvant-induced inflammation. Journal of neuroinflammation, 13, p. 42. BioMed Central 10.1186/s12974-016-0506-x <http://dx.doi.org/10.1186/s12974-016-0506-x>

doi:10.7892/boris.81913

info:doi:10.1186/s12974-016-0506-x

info:pmid:26893156

urn:issn:1742-2094

Idioma(s)

eng

Publicador

BioMed Central

Relação

http://boris.unibe.ch/81913/

Direitos

info:eu-repo/semantics/openAccess

Fonte

Quast, Isaak; Keller, Christian W; Weber, Patrick; Schneider, Christoph; von Gunten, Stephan; Lünemann, Jan D (2016). Protection from experimental autoimmune encephalomyelitis by polyclonal IgG requires adjuvant-induced inflammation. Journal of neuroinflammation, 13, p. 42. BioMed Central 10.1186/s12974-016-0506-x <http://dx.doi.org/10.1186/s12974-016-0506-x>

Palavras-Chave #610 Medicine & health
Tipo

info:eu-repo/semantics/article

info:eu-repo/semantics/publishedVersion

PeerReviewed