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Involvement of granulocyte factor (GF) in receptor-triggered stimulation of lymphocytes and neutrophils

H Tchórzewski1, K Zeman, Z Sulowska

  • 1Department of Pathophysiology and Immunology, Polish Academy of Sciences, Lódź, Poland.

Allergologia Et Immunopathologia
|September 1, 1990
PubMed

Insights

Granulocyte factor (GF) from neutrophils influences human lymphocyte proliferation, acting as an inhibitor at high concentrations and a costimulator at low concentrations. This factor impacts immune cell interactions and activation pathways.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Polymorphonuclear neutrophils contain specific granules with bioactive factors.
  • Human lymphocyte proliferation is a key process in adaptive immunity.

Purpose of the Study:

  • To investigate the effects of granulocyte factor (GF) on human lymphocyte proliferation.
  • To elucidate the mechanisms underlying GF's influence on immune cell activation.

Main Methods:

  • In vitro assays measuring lymphocyte proliferation in response to mitogens and alloantigens.
  • Use of phorbol ester (PMA) and monoclonal antibodies (anti-CD2, anti-CD3) to stimulate lymphocytes.
  • Analysis of IL-2 production and IL-2 receptor (IL-2R) expression.
  • Assessment of GF binding to stimulated lymphocytes and its effect on granulocyte stimulation and O2 production.

Main Results:

  • GF exhibited a dual effect on lymphocyte proliferation: inhibition at higher concentrations and costimulation at lower concentrations.
  • GF enhanced lymphocyte proliferation when combined with PMA or anti-CD2 mAb plus PMA.
  • Comitogenic effects of GF correlated with increased IL-2 production and IL-2R expression.
  • GF binding to stimulated lymphocytes suggests recognition of activation-specific molecules.
  • GF modulated granulocyte responses, inhibiting zymosan-induced stimulation while promoting O2 production.

Conclusions:

  • Granulocyte factor plays a complex role in modulating human lymphocyte proliferation and activation.
  • GF's effects are concentration-dependent and involve pathways related to IL-2 signaling.
  • GF may target common molecules on leukocytes, potentially including leukocyte adhesive glycoproteins.

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