Suppression of monocyte and neutrophil function by recombinant IL-2

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S E Smith1, G D Warren, Y H Thong

  • 1Department of Child Health and Immunobiology Laboratory University of Queensland Mater Misericordiae Hospitals, South Brisbane Queensland 4101 Australia.

Mediators of Inflammation
|January 1, 1993
PubMed

Insights

Interleukin-2 (IL-2) significantly impacts monocyte functions, suppressing their movement and metabolism. While IL-2 affects neutrophil adherence and respiration, its broader regulatory role in monocytes suggests versatile cytokine activity.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The influence of Interleukin-2 (IL-2) on phagocyte function remains largely unexplored.
  • Phagocytes, including neutrophils and monocytes, are critical components of the innate immune system.

Purpose of the Study:

  • To investigate the effects of human recombinant IL-2 on human neutrophil and monocyte functions.
  • To elucidate the dose-dependent impact of IL-2 on phagocyte mobility, phagocytosis, glucose uptake, respiration, and degranulation.

Main Methods:

  • Incubation of human neutrophils and monocytes with varying concentrations of human recombinant IL-2.
  • Assessment of adherence, migration (random and stimulated), phagocytosis, glucose uptake (deoxyglucose), hexose monophosphate shunt activity, and degranulation.

Main Results:

  • IL-2 suppressed neutrophil adherence and hexose monophosphate shunt activity.
  • Monocytes exhibited greater sensitivity, with IL-2 suppressing adherence, migration, glucose uptake, and hexose monophosphate shunt activity, even with phorbol myristate acetate stimulation.
  • Monocyte phagocytosis and degranulation, along with neutrophil migration, phagocytosis, and degranulation, were unaffected by IL-2.
  • All observed effects were dose-dependent within the biologically active range of IL-2.

Conclusions:

  • IL-2 plays a significant down-regulatory role in various monocyte functions, including movement, glucose uptake, and respiration.
  • The regulatory role of IL-2 in neutrophil function is limited to adherence and respiration.
  • These findings suggest IL-2 possesses a more versatile cytokine profile than previously understood, impacting innate immune cells.

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