A decoy peptide derived from TIR domain of TIRAP inhibits TLR signaling pathway

Alternative Title
GUI XIANGAI
Author(s)
GUI, XIANGAI
Alternative Author(s)
GUI XIANGAI
Advisor
최상돈
Department
일반대학원 분자과학기술학과
Publisher
The Graduate School, Ajou University
Publication Year
2017-02
Language
eng
Keyword
TLR inhibiting peptideinnate immuneToll-like receptor 4Toll-like receptor 3
Alternative Abstract
ABSTRACT Toll-like receptors (TLRs) belong to the family of type I transmembrane proteins. These receptors are capable of recognizing specific parts of microbes and are able of activating different groups of signaling molecules. The activation of these receptors leads to a protective innate immune response against invading microbial and viral pathogens along with the production of inflammatory cytokines, chemokines, and type I interferons. However, an excessive TLRs-mediated immune response is associated with the onset and/or the aggravation of various inflammatory and auto-immune diseases. Thus, targeting TLRs or TLRs adaptor molecules offers a promising therapeutic approach for the inhibition of inflammation-related diseases. TIRAP (Toll/interleukin-1 receptor (TIR) domain containing adaptor protein) is an important adaptor molecule that is involved in TLR4 signaling spread. Herein, a TIRAP derived peptide, TIP1, has been assessed to hinder the TLR4-mediated signaling pathway. TIP1 inhibited lipopolysaccharide (LPS)-induced activation of NF-κB and MAPKs, and diminished the TLR4-mediated production of pro-inflammatory cytokines (i.e. IL-6 and TNF-α). It also reduced the expression levels of iNOS, COX2, and suppressed intracellular NO production, NO secretion and intracellular ROS generation. TIP1 also potently inhibited TLR3-mediated TNF-α and IFN-β secretion. Cell imaging by confocal microscopy, western blotting, and in vitro studies demonstrated that TIP1 preferentially inhibits TLR4, 3-mediated signaling and it also slightly hinders TLR2/1, 2/6, 7, 8, 9-mediated signaling. Finally, TIP1 diminished systemic cytokine responses (i.e. TNF-α, IL-12p40 and IL-6) elicited in vivo by LPS at 2 h challenge. Thus, TIP1 represents a novel inhibitory agent that majorly suppresses TLR4- and TLR3-mediated inflammatory response and blocks protein-protein interaction of the downstream mediators.
URI
https://dspace.ajou.ac.kr/handle/2018.oak/11242
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Graduate School of Ajou University > Department of Molecular Science and Technology > 3. Theses(Master)
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