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Human monocyte/macrophages activate by exposure to LPS overexpress NGF and NGF receptors

M C Caroleo1, N Costa, L Bracci-Laudiero

  • 1Faculty of Pharmacy, Department of Pharmacobiology, University of Calabria, Cosenza, Italy.

Journal of Neuroimmunology
|February 13, 2001
PubMed

Insights

Human monocytes/macrophages produce Nerve Growth Factor (NGF), which is crucial for regulating their survival during inflammation. Blocking NGF leads to monocyte apoptosis, highlighting its role in immune homeostasis.

Area of Science:

  • Immunology
  • Cell Biology
  • Neuroscience

Background:

  • Monocyte/macrophages are key immune cells in inflammatory responses.
  • Nerve Growth Factor (NGF) is a crucial signaling molecule in the nervous system and immune system.

Purpose of the Study:

  • To investigate if monocyte/macrophages produce NGF.
  • To determine the role of NGF in monocyte/macrophage function during inflammation.

Main Methods:

  • Human monocyte/macrophages were cultured and stimulated with Lipopolysaccharide (LPS).
  • NGF production was measured.
  • Expression of high and low affinity NGF receptors (p75) was analyzed.
  • NGF was neutralized using an NGF antibody.

Main Results:

  • Unstimulated human monocyte/macrophages produce NGF.
  • LPS stimulation significantly increased NGF synthesis.
  • NGF stimulation correlated with increased high-affinity NGF receptor expression.
  • Neutralization of NGF in LPS-activated cells led to p75 receptor overexpression and apoptosis.

Conclusions:

  • Human monocyte/macrophages produce and secrete NGF.
  • NGF plays a vital role in regulating monocyte/macrophage survival during inflammation.
  • These findings offer new insights into immune defense and homeostasis mechanisms.

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