The Role of TLR2, TRL3, TRL4, and TRL9 Signaling in the Pathogenesis of Autoimmune Disease in a Retinal Autoimmunity Model

Overview

Journal Invest Ophthalmol Vis Sci

Specialty Ophthalmology

Date 2010 Jan 29

PMID 20107166

Citations 35

Authors

Jiazhu Fang

Dan Fang

Phyllis B Silver

Feng Wen

Bing Li

Xiangrong Ren

Qing Lin

Rachel R Caspi

Shao Bo Su

Affiliations

Soon will be listed here.

Abstract

Purpose: Induction of tissue-specific experimental autoimmune diseases involves the use of complete Freund adjuvant containing Mycobacterium tuberculosis, whose recognition by the innate immune system depends on Toll-like receptors (TLRs) that signal through the adaptor molecule MyD88. The authors' previous study showed that MyD88(-/-) mice, but not TLR2(-/-), TLR4(-/-), or TLR9(-/-) mice, were resistant to experimental autoimmune uveitis (EAU).

Methods: The EAU induction in mice deficient in TLR3 or mice double deficient in TLR2+4, TLR2+9, and TLR4+9 was examined and the role of the TLR agonists in the adjuvant effect involved in the induction of EAU was assessed.

Results: TLR3-deficient and TLR2+4, TLR2+9, and TLR4+9 double-deficient mice were as susceptible to EAU as their control littermates. However, in mice immunized with a low-dose EAU regimen, TLR4 agonist lipopolysaccharide (LPS) enhanced EAU scores, delayed-type hypersensitivity responses, and antigen-specific T-cell proliferation. Antigen-specific IL-17 and IFN-gamma production by T lymphocytes was markedly increased in the LPS-treated group. The effects of LPS on EAU were abolished by treatment with an LPS deactivator polymyxin B. Inclusion of agonists for TLR2, TRL3, or TRL9 in immunization also enhanced EAU scores.

Conclusions: These results suggest that signaling of TLR2, TRL3, TRL4, and TRL9 is highly redundant in the adjuvant effect needed to induce EAU and that diverse microbial infections may contribute to the pathogenesis of diseases such as uveitis.

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