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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Eosinophils traditionally viewed as short-lived granulocytes in type 2 immunity and allergic reactions.
  • Emerging evidence highlights eosinophils' broader roles in tissue homeostasis, repair, metabolism, and host defense.
  • Significant heterogeneity observed in eosinophil populations across different tissues and inflammatory conditions.

Purpose of the Study:

  • To discuss the current understanding of eosinophil development, tissue adaptation, and functional specialization.
  • To propose a new framework for understanding eosinophil identity and function.
  • To reframe eosinophils as adaptable participants in tissue physiology.

Main Methods:

  • Literature review and synthesis of current research on eosinophils.
  • Development of a conceptual framework integrating multiple factors influencing eosinophil identity.
  • Analysis of eosinophil heterogeneity in various organ and disease contexts.

Main Results:

  • Eosinophil heterogeneity challenges the notion of a uniform cell population.
  • Eosinophil identity is shaped by differentiation, local environment, residence time, and inflammatory status.
  • Eosinophil states are dynamic, context-dependent, and tuned to their tissue environment.

Conclusions:

  • Eosinophils are multifunctional immune cells with diverse roles beyond type 2 immunity.
  • A multidimensional framework explains eosinophil adaptability and specialization.
  • Eosinophils are integral to tissue physiology and host defense.