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Activity of interleukin 6 in the differentiation of monocytes to macrophages and dendritic cells

H Mitani1, N Katayama, H Araki

  • 1The Second Department of Internal Medicine, Mie University School of Medicine, Tsu, Mie 514-8507, Japan.

British Journal of Haematology
|June 10, 2000
PubMed

Insights

Interleukin-6 (IL-6) promotes monocyte differentiation into macrophages over dendritic cells (DCs). This process is modulated by factors like tumor necrosis factor-alpha (TNF-alpha), impacting immune cell development.

Area of Science:

  • Immunology
  • Cell Biology
  • Hematopoiesis

Background:

  • Peripheral blood monocytes serve as precursors for dendritic cells (DCs) and macrophages.
  • Understanding factors regulating monocyte differentiation is crucial for immune cell development.

Purpose of the Study:

  • To identify factors regulating the differentiation of monocytes into DCs and macrophages.
  • To investigate the specific role of IL-6 and its modulators in this differentiation process.

Main Methods:

  • Monocytes (CD14+) were cultured with granulocyte-macrophage colony-stimulating factor (GM-CSF) and IL-4.
  • The effects of IL-6, IL-6 receptor-neutralizing mAb, gp130-neutralizing mAb, and other cytokines (IL-11, LIF, OSM, M-CSF) were assessed.
  • Modulatory effects of TNF-alpha, LPS, IL-1beta, CD40L, and TGF-beta1 on IL-6-induced differentiation were examined.

Main Results:

  • IL-6, in the presence of GM-CSF and IL-4, promoted the differentiation of monocytes into macrophages (CD14+CD1a-) at the expense of DCs (CD14-CD1a+).
  • Neutralization of IL-6 receptor or gp130 reduced macrophage differentiation.
  • The inhibitory effect of IL-6 on DC differentiation was blocked by TNF-alpha, LPS, IL-1beta, CD40L, and TGF-beta1, with TNF-alpha being the most potent inhibitor.

Conclusions:

  • IL-6 inhibits monocyte differentiation into dendritic cells by promoting differentiation towards macrophages.
  • This IL-6-mediated shift in differentiation is significantly modulated by other inflammatory and regulatory factors, including TNF-alpha.

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