Intramembrane attenuation of the TLR4-TLR6 dimer impairs receptor assembly and reduces microglia-mediated neurodegeneration

Liraz Shmuel-Galia, Yoel Klug, Ziv Porat, Meital Charni, Batya Zarmi, Yechiel Shai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Recently, a single study revealed a new complex composed of Toll-like receptor 4 (TLR4), TLR6, and CD36 induced by fibrillary A peptides, the hallmark of Alzheimer’s disease. Unlike TLRs located on the plasma membrane that dimerize on the membrane after ligand binding to their extracellular domain, the TLR4-TLR6 –CD36 complex assembly has been suggested to be induced by intracellular signals from CD36, similar to integrin inside-out signaling. However, the assembly site of TLR4-TLR6 –CD36 and the domains participating in A-induced signaling is still unknown. By interfering with TLR4-TLR6 dimerization using a TLR4-derived peptide, we show that receptor assembly is abrogated within the plasma membrane. Furthermore, we reveal that the transmembrane domains of TLR4 and TLR6 have an essential role in receptor dimerization and activation. Inhibition of TLR4-TLR6 assembly was associated with reduced secretion of proinflammatory mediators from microglia cells, ultimately rescuing neurons from death. Our findings support TLR4-TLR6 dimerization induced by A. Moreover, we shed new light on TLR4-TLR6 assembly and localization and show the potential of inhibiting TLR4-TLR6 dimerization as a treatment of Alzheimer’s disease.

Original languageAmerican English
Pages (from-to)13415-13427
Number of pages13
JournalJournal of Biological Chemistry
Volume292
Issue number32
DOIs
StatePublished - 11 Aug 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 by The American Society for Biochemistry and Molecular Biology, Inc.

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