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Related Experiment Video

Updated: Jun 21, 2026

Metabolic Characterization of Polarized M1 and M2 Bone Marrow-derived Macrophages Using Real-time Extracellular Flux Analysis
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Metabolic Characterization of Polarized M1 and M2 Bone Marrow-derived Macrophages Using Real-time Extracellular Flux Analysis

Published on: November 28, 2015

Cell-Resolved Mass Spectrometry Imaging Integrated with Isotope Tracing Elucidates Macrophage Polarization-Specific

Min Li1, Junjie Ge2, Bangzhen Ma1,3

  • 1School of Pharmaceutical Sciences, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China.

Analytical Chemistry
|June 20, 2026
PubMed
Summary
This summary is machine-generated.

Tumor-associated macrophages exhibit distinct metabolic activities, crucial for antitumor immunity. This study reveals phospholipid metabolism

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Whole-cell MALDI-TOF Mass Spectrometry is an Accurate and Rapid Method to Analyze Different Modes of Macrophage Activation
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Whole-cell MALDI-TOF Mass Spectrometry is an Accurate and Rapid Method to Analyze Different Modes of Macrophage Activation

Published on: December 26, 2013

Area of Science:

  • Immunology
  • Metabolomics
  • Cell Biology

Background:

  • Tumor-associated macrophages (TAMs) are key regulators of antitumor immunity, with M1 (antitumor) and M2 (tumor-promoting) phenotypes linked to metabolic states.
  • Conventional mass spectrometry imaging (MSI) lacks the resolution to capture dynamic metabolic activity and real-time substrate utilization within individual macrophages.

Purpose of the Study:

  • To develop and apply an integrated approach combining cell-resolved matrix-assisted laser desorption/ionization (MALDI)-MSI with stable isotope tracing.
  • To visualize and analyze dynamic metabolic heterogeneity across individual macrophage phenotypes in situ.

Main Methods:

  • Utilized isotopically labeled fatty acids as metabolic tracers in conjunction with cell-resolved MALDI-MSI.
  • Investigated metabolic differences between M1 and M2 macrophages and the impact of tumor cell coculture.
  • Assessed the role of cPLA2 inhibition on M1 macrophage antitumor efficacy.

Main Results:

  • M1 macrophages demonstrated significantly enhanced synthesis of phospholipids (PE, PI, PS, PA) compared to M2 macrophages, indicating a polarization-specific metabolic signature.
  • Coculture with tumor cells downregulated newly labeled phospholipids in M1 macrophages.
  • Pharmacological inhibition of cPLA2 impaired the antitumor efficacy of M1 macrophages.

Conclusions:

  • Phospholipid metabolism is functionally important for sustaining macrophage-mediated antitumor immunity.
  • The developed spatially resolved metabolic tracing strategy offers new insights into cell-resolved metabolic crosstalk in complex biological systems.