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Determination of Immune Cell Identity and Purity Using Epigenetic-Based Quantitative PCR
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Quantitative proteomics reveals a role for epigenetic reprogramming during human monocyte differentiation.

Dequina Nicholas1, Hui Tang2, Qiongyi Zhang3

  • 1From the ‡Department of Biochemistry, Loma Linda University, Loma Linda, California 92354;

Molecular & Cellular Proteomics : MCP
|October 16, 2014
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Summary

Histone modifications and linker histone H1 protein levels change during human monocyte differentiation into macrophages and dendritic cells. These epigenetic changes are crucial for myeloid cell development and immune responses.

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Area of Science:

  • Immunology
  • Epigenetics
  • Cell Biology

Background:

  • Monocyte differentiation into macrophages and dendritic cells is critical for innate immunity.
  • Epigenetic reprogramming plays a key role in monocyte differentiation.
  • Mass spectrometry offers a novel approach to study immune cell differentiation by profiling protein and histone expression.

Purpose of the Study:

  • To investigate changes in human monocytes during differentiation into macrophages and dendritic cells using mass spectrometry and bioinformatics.
  • To identify specific histone modifications and linker histone alterations involved in this process.

Main Methods:

  • Application of mass spectrometry for protein and histone expression profiling.
  • Bioinformatic analysis to identify molecular changes.
  • Treatment with histone deacetylase inhibitor Apicidin to study differentiation induction.

Main Results:

  • Linker histone H1 proteins were significantly down-regulated during monocyte differentiation.
  • Specific histone H3 modifications (H3K9me/S10ph/K14ac) decreased in dendritic cells.
  • Histone H4 K16 acetylation increased in dendritic cells compared to monocytes and macrophages.
  • Histone deacetylase inhibitor Apicidin induced monocyte differentiation.

Conclusions:

  • Specific inter- and intra-histone modifications, alongside linker histone remodeling, are essential for human myeloid cell differentiation.
  • These epigenetic events regulate cell cycle progression and the development of macrophages and dendritic cells.