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Homeostatic Eosinophils: Characteristics and Functions.

Thomas Marichal1,2, Claire Mesnil1,2, Fabrice Bureau1,2,3

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Area of Science:

  • Immunology
  • Cell Biology
  • Physiology

Background:

  • Eosinophils are effector cells recruited during Th2 responses to helminth infections and allergic diseases like asthma.
  • Upon tissue injury, eosinophils release cytotoxic proteins, exacerbating inflammation and damage.

Purpose of the Study:

  • To challenge the paradigm of eosinophils as solely inflammatory cells.
  • To provide an overview of the homeostatic functions of eosinophils.

Main Methods:

  • Review of accumulating evidence on eosinophil functions.
  • Analysis of eosinophil distribution and activity under steady-state conditions.

Main Results:

  • Eosinophils are increasingly recognized for regulating homeostatic processes.
  • Under baseline conditions, eosinophils migrate to tissues like the GI tract, lungs, and adipose tissue.
  • These cells are involved in immunoregulation, glucose homeostasis, obesity control, and reproductive functions.

Conclusions:

  • Eosinophils possess significant homeostatic functions beyond their inflammatory roles.
  • The understanding of eosinophils is expanding to include their role in maintaining physiological balance.