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Human eosinophil granulocytes do not express the enzyme arginase

Claudia Luckner-Minden1, Ina Fischer, Claus-Dieter Langhans

  • 1Department of Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany.

Journal of Leukocyte Biology
|March 5, 2010
PubMed

Insights

Human eosinophils (Eos) do not express the immunosuppressive enzyme arginase. Unlike neutrophils, Eos cannot limit arginine, impacting immune responses in allergies, infections, and tumors.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Human polymorphonuclear cells (PMNs) express arginase I, suppressing adaptive immunity by consuming arginine.
  • Eosinophils (Eos) are key immune cells in allergic inflammation, parasitic infections, and tumor immunity.
  • The role of arginase in Eos function and immune modulation remains unclear.

Purpose of the Study:

  • To investigate whether human Eos express arginase and if its activity has immunosuppressive consequences.
  • To determine if Eos contribute to arginine metabolism in the context of immune responses.

Main Methods:

  • Analysis of arginase I and II protein expression in human peripheral blood Eos.
  • Assay for arginase enzymatic activity in Eos.
  • Detection of arginine metabolism to ornithine in Eos.
  • In vitro studies involving Eos apoptosis and cytokine activation.
  • Examination of Eos from allergic patients (peripheral blood and bronchoalveolar lavage fluid).

Main Results:

  • Human peripheral blood Eos lack arginase I and II protein and enzymatic activity.
  • No arginine metabolism to ornithine was detected in Eos.
  • Eos apoptosis or cytokine activation did not induce arginase expression.
  • Arginase was undetectable in Eos from allergic patients, even during in vivo inflammation.

Conclusions:

  • Human Eos fundamentally differ from neutrophils regarding arginase expression.
  • Eos do not possess the immunosuppressive enzyme arginase.
  • Eos cannot suppress adaptive immune responses through arginine limitation in allergic inflammation, infections, or tumor immunity.

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