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Updated: Apr 19, 2026
Proteomic Profiling of Macrophages by 2D Electrophoresis
Published on: November 4, 2014
Integrating phosphoproteome and transcriptome reveals new determinants of macrophage multinucleation
Maxime Rotival1, Jeong-Hun Ko2, Prashant K Srivastava1
1From the ‡Integrative Genomics and Medicine, MRC Clinical Sciences Centre, Imperial College London, UK;
Abstract:
Macrophage multinucleation (MM) is essential for various biological processes such as osteoclast-mediated bone resorption and multinucleated giant cell-associated inflammatory reactions. Here we study the molecular pathways underlying multinucleation in the rat through an integrative approach combining MS-based quantitative phosphoproteomics (LC-MS/MS) and transcriptome (high-throughput RNA-sequencing) to identify new regulators of MM. We show that a strong metabolic shift toward HIF1-mediated glycolysis occurs at transcriptomic level during MM, together with modifications in phosphorylation of over 50 proteins including several ARF GTPase activators and polyphosphate inositol phosphatases. We use shortest-path analysis to link differential phosphorylation with the transcriptomic reprogramming of macrophages and identify LRRFIP1, SMARCA4, and DNMT1 as novel regulators of MM. We experimentally validate these predictions by showing that knock-down of these latter reduce macrophage multinucleation. These results provide a new framework for the combined analysis of transcriptional and post-translational changes during macrophage multinucleation, prioritizing essential genes, and revealing the sequential events leading to the multinucleation of macrophages.
Insights
Researchers identified novel regulators of macrophage multinucleation (MM) by integrating phosphoproteomics and RNA-sequencing. Key findings reveal metabolic shifts and specific protein changes driving this essential biological process.
Area of Science:
- Cell Biology
- Molecular Biology
- Immunology
Background:
- Macrophage multinucleation (MM) is crucial for bone resorption and inflammatory responses.
- Understanding the molecular mechanisms of MM is vital for various physiological and pathological processes.
Purpose of the Study:
- To identify novel molecular regulators of macrophage multinucleation.
- To elucidate the interplay between transcriptomic and phosphoproteomic changes during MM.
Main Methods:
- Integrative analysis of MS-based quantitative phosphoproteomics (LC-MS/MS) and high-throughput RNA-sequencing in rat macrophages.
- Shortest-path analysis to correlate differential phosphorylation with transcriptomic reprogramming.
- Experimental validation using gene knockdown to assess the role of identified regulators.
Main Results:
- A significant metabolic shift towards HIF1-mediated glycolysis was observed at the transcriptomic level during MM.
- Over 50 proteins showed altered phosphorylation, including ARF GTPase activators and polyphosphate inositol phosphatases.
- LRRFIP1, SMARCA4, and DNMT1 were identified as novel regulators of MM, with knockdown reducing multinucleation.
Conclusions:
- The study provides a novel framework for analyzing combined transcriptional and post-translational changes in MM.
- Identified regulators (LRRFIP1, SMARCA4, DNMT1) offer potential therapeutic targets.
- Revealed sequential molecular events leading to macrophage multinucleation.
