Cytokine receptor signalling in neonatal macrophages: defective STAT-1 phosphorylation in response to stimulation

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L Maródi1, K Goda, A Palicz

  • 1Department of Infectology and Paediatric Immunology, Medical and Health Science Center, University of Debrecen, Debrecen, Hungary. lmarodi@jaguar.dote.hu

Clinical and Experimental Immunology
|December 12, 2001
PubMed

Insights

Neonatal monocytes and macrophages show impaired signaling in response to interferon-gamma (IFN-γ). This decreased STAT-1 phosphorylation suggests developmental immaturity, potentially explaining neonates' susceptibility to intracellular infections.

Area of Science:

  • Immunology
  • Neonatal Biology
  • Cellular Signaling

Background:

  • Neonatal monocyte-derived macrophages (MDM) exhibit incomplete activation by IFN-γ.
  • This reduced responsiveness is not due to lower IFN-γ receptor expression.

Purpose of the Study:

  • To investigate the mechanisms of IFN-γ receptor-mediated signaling in neonatal cord monocytes and MDM.
  • To analyze STAT-1 expression and phosphorylation in response to IFN-γ in neonatal and adult cells.

Main Methods:

  • Flow cytometry was used to analyze intracellular STAT-1 expression.
  • Monoclonal antibodies (MoAbs) distinguishing native and phosphorylated STAT-1 were employed.
  • STAT-1 phosphorylation was assessed in cord and adult monocytes and MDM after IFN-γ stimulation.

Main Results:

  • STAT-1 expression was comparable in neonatal and adult monocytes and MDM.
  • STAT-1 phosphorylation in response to IFN-γ was significantly decreased in neonatal monocytes (P < 0.05) and MDM (P < 0.01) compared to adult cells.
  • These findings indicate deficient IFN-γ-mediated signaling in neonatal mononuclear phagocytes.

Conclusions:

  • Decreased STAT-1 phosphorylation suggests developmental immaturity in neonatal immune cells.
  • This signaling defect may contribute to increased neonatal susceptibility to intracellular pathogens.

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