High-affinity interactions and signal transduction between Aβ oligomers and TREM2.
Authors of this article are:
Lessard CB, Malnik SL, Zhou Y, Ladd TB, Cruz PE, Ran Y, Mahan TE, Chakrabaty P, Holtzman DM, Ulrich JD, Colonna M, Golde TE.
A summary of the article is shown below:
Rare coding variants in the triggering receptor expressed on myeloid cells 2 (TREM2) are associated with increased risk for Alzheimer’s disease (AD), but how they confer this risk remains uncertain. We assessed binding of TREM2, AD-associated TREM2 variants to various forms of Aβ and APOE in multiple assays. TREM2 interacts directly with various forms of Aβ, with highest affinity interactions observed between TREM2 and soluble Aβ42 oligomers. High-affinity binding of TREM2 to Aβ oligomers is characterized by very slow dissociation. Pre-incubation with Aβ is shown to block the interaction of APOE In cellular assays, AD-associated variants of TREM2 reduced the amount of Aβ42 internalized, and in NFAT assay, the R47H and R62H variants decreased NFAT signaling activity in response to Aβ42. These studies demonstrate i) a high-affinity interaction between TREM2 and Aβ oligomers that can block interaction with another TREM2 ligand and ii) that AD-associated TREM2 variants bind Aβ with equivalent affinity but show loss of function in terms of signaling and Aβ internalization.
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This article is a good source of information and a good way to become familiar with topics such as:
APOE ;Alzheimer’s disease;TREM2;amyloid;innate immune response
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