A novel strategy to dissect multifaceted macrophage function in human diseases

Area of Science:

• Immunology
• Computational Biology
• Pathology

Background:

• Macrophages are crucial immune cells involved in physiological and pathological processes like obesity and cardiovascular disease (CVD).
• Traditionally viewed as M1 (proinflammatory) or M2 (anti-inflammatory), macrophage polarization exists on a spectrum with complex roles in disease.
• Adipose tissue and plaque macrophages exhibit inconsistent polarization and phenotypes beyond the M1/M2 paradigm.

Purpose of the Study:

• To develop novel computational tools for detailed characterization of macrophage states in human disease.
• To analyze macrophage polarization, differentiation, and lipid accumulation (foaming) in obesity and CVD.
• To identify disease-relevant macrophage subpopulations and their functional programs.

Main Methods:

• Development of MacSpectrum and AtheroSpectrum computational tools.
• Analysis of macrophage polarization status, differentiation, and foaming in human and mouse samples.
• Identification of macrophage subpopulations based on functional characteristics.

Main Results:

• MacSpectrum and AtheroSpectrum provide functional insights into macrophage subpopulations in obesity and CVD.
• Disease-relevant macrophage states were identified in obesity and cardiovascular disease.
• A novel concept of homeostatic noninflammatory and pathogenic inflammatory foaming programs in macrophage-derived foam cells was established.

Conclusions:

• Novel computational tools enable advanced characterization of macrophage heterogeneity in disease.
• Macrophage states in obesity and CVD are more complex than the traditional M1/M2 model.
• Understanding distinct foaming programs offers new avenues for therapeutic strategies in metabolic and cardiovascular diseases.