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Th1 and Th2 cytokines cooperate to stimulate mannose-receptor-mediated phagocytosis

D Raveh1, B A Kruskal, J Farland

  • 1Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston 02114, USA.

Journal of Leukocyte Biology
|July 17, 1998
PubMed

Insights

Interleukin-4 (IL-4) and interferon-gamma (IFN-gamma) enhance mannose receptor phagocytosis, despite opposing effects on its expression. These cytokines cooperate to boost macrophage phagocytic function against microorganisms.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The mannose receptor on macrophages mediates endocytosis and phagocytosis.
  • Interleukin-4 (IL-4, Th2 cytokine) increases mannose receptor expression and endocytosis.
  • Interferon-gamma (IFN-gamma, Th1 cytokine) decreases mannose receptor expression and endocytosis.

Purpose of the Study:

  • To investigate the combined effects of IL-4 and IFN-gamma on mannose receptor-mediated phagocytosis.
  • To determine if Th1 and Th2 cytokines cooperate to enhance macrophage phagocytic function.

Main Methods:

  • Macrophage cultures treated with IL-4 and/or IFN-gamma.
  • Assays to measure mannose receptor expression, endocytosis, and phagocytosis.
  • Comparison with Fc receptor-mediated phagocytosis.

Main Results:

  • Both IL-4 and IFN-gamma enhance mannose receptor-mediated phagocytosis, individually and together.
  • Cooperative enhancement of phagocytosis occurs despite opposing effects on receptor expression and endocytosis.
  • Interleukin-13 (IL-13) shows similar effects to IL-4.
  • This cooperative effect is specific to mannose receptor-mediated phagocytosis, not Fc receptor-mediated.

Conclusions:

  • Th1 and Th2 cytokines, typically antagonistic, cooperate to enhance mannose receptor-mediated phagocytosis.
  • This cooperation may play a role in immune responses at sites of inflammation.
  • Cytokine synergy boosts the clearance of microorganisms via mannose receptor pathways.

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