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Transcriptional Activation of the TREM2 Gene by ZEB2 in a Zinc Finger-Dependent Manner
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Transcriptional Activation of the TREM2 Gene by ZEB2 in a Zinc Finger-Dependent Manner
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Journal Article
Transcriptional Activation of the TREM2 Gene by ZEB2 in a Zinc Finger-Dependent Manner
2025
Overview
Background/Objectives: TREM2 is a transmembrane receptor highly expressed in microglia and macrophages, and its involvement in Alzheimer’s disease, obesity, and cancer has garnered significant attention. Although its biological function has been actively investigated, the mechanisms by which its expression is regulated remain incompletely characterized. In this study, we aimed to identify transcription factors that modulate TREM2 expression among those reported to be expressed in microglia. Methods: We inserted a 5 kb upstream region of TREM2 into a luciferase reporter vector. This construct was co-expressed with 15 transcription factors, and the TREM2 transcriptional activity was evaluated using luciferase assays. The most promising transcription factor was subsequently knocked down in HMC3 cells, which are derived from human microglia, to assess its effect on endogenous TREM2 expression. Results: Among the 15 transcription factor candidates tested, SPI1 (PU.1), MAFB, CEBPA, ZEB2, and SALL1 most strongly enhanced TREM2 transcriptional activity. ZEB2 was prioritized due to its limited study in microglia and higher co-expression with TREM2. In HMC3 cells, ZEB2 knockdown reduced both TREM2 mRNA and protein levels. Further analysis using domain-deleted mutants of ZEB2 indicated that the zinc finger domains are essential for its transcriptional activity. Analysis using truncated mutants of the TREM2 upstream region suggests that ZEB2 acts on multiple sites within this region. Chromatin immunoprecipitation also suggested an interaction between ZEB2 and the upstream region of TREM2. Conclusions: This study novelly suggests ZEB2 as a transcription factor that promotes TREM2 expression. Further investigation into the role of ZEB2 in various TREM2-associated diseases is warranted.
Publisher
MDPI AG
Subject
/ Analysis
/ Brain
/ Dementia
/ Disease
/ Ethylenediaminetetraacetic acid
/ Genes
/ Humans
/ Kinases
/ Ligands
/ Membrane Glycoproteins - genetics
/ Membrane Glycoproteins - metabolism
/ Mutants
/ Mutation
/ Proteins
/ Receptors, Immunologic - genetics
/ Receptors, Immunologic - metabolism
/ RNA
/ Transcription Factors - genetics
/ Transcription Factors - metabolism
/ Zinc Finger E-box Binding Homeobox 2 - genetics
