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Related Experiment Video

Updated: Mar 30, 2026

Three-dimensional Confocal Analysis of Microglia/macrophage Markers of Polarization in Experimental Brain Injury
13:28

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Published on: September 4, 2013

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TRAM1 Promotes Microglia M1 Polarization.

Hanxiang Wang1, Chun Liu2, Ming Han1

  • 1Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, China.

Journal of Molecular Neuroscience : MN
|November 14, 2015
PubMed
Summary

Translocase of the outer membrane 1 (TRAM1) promotes pro-inflammatory M1 microglia polarization. TRAM1 is essential for Toll-like receptor 4 (TLR4) signaling, driving M1 gene expression in the central nervous system.

Keywords:
INOSLPS/IFN-γMicroglia M1 polarizationTBKTRAM1

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Area of Science:

  • Neuroimmunology
  • Cellular Biology
  • Molecular Mechanisms

Background:

  • Microglia are central nervous system immune cells with M1 (pro-inflammatory) and M2 (anti-inflammatory) phenotypes.
  • M1 microglia are implicated in central nervous system (CNS) disorders, while M2 microglia aid tissue repair.
  • Translocase of the outer membrane 1 (TRAM1) is a protein involved in polypeptide translocation and Toll-like receptor 4 (TLR4) sorting.

Purpose of the Study:

  • To investigate the role of TRAM1 in microglia polarization, specifically M1 polarization.
  • To elucidate the molecular mechanisms by which TRAM1 influences M1 microglia activation.

Main Methods:

  • Stimulation of BV2 and primary microglia cells with LPS/interferon-gamma (IFN-γ).
  • Overexpression of Flag-TRAM1 and control Flag-GFP.
  • Gene silencing of TRAM1.
  • Analysis of M1 marker gene expression (IL-6, IL-1β, iNOS).
  • Assessment of TLR4 signaling pathway components (IRAK1, TBK1, IRF3, IκB, P65).

Main Results:

  • TRAM1 expression is upregulated in activated microglia.
  • TRAM1 overexpression enhances M1 polarization and M1 marker gene expression.
  • TRAM1 silencing inhibits LPS/IFN-γ-induced M1 gene expression.
  • TRAM1 cooperates with TLR4 to induce M1 polarization.
  • TRAM1 is crucial for TLR4 pathway activation, including IRAK1, TBK1, IRF3, IκB, and P65 signaling.

Conclusions:

  • TRAM1 plays a significant role in promoting microglia M1 polarization.
  • TRAM1 acts as a key mediator in the TLR4 signaling pathway, driving pro-inflammatory responses in microglia.
  • TRAM1 is a potential therapeutic target for CNS disorders associated with M1 microglia activation.