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Basic Science and Pathogenesis.

Ruchi Gera1, Simone Tambaro2, Per Nilsson2

  • 1Division of Clinical Geriatrics, Dept.of NVS, Karolinska Institutet, Huddinge, Stockholm, Sweden.

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|December 24, 2025
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Summary
This summary is machine-generated.

Nerve Growth Factor (NGF) receptors are present on all examined immune cells, suggesting a role in modulating immune responses. NGF therapy may reduce inflammation by decreasing pro-inflammatory cytokine production in T cells.

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Area of Science:

  • Neuroscience
  • Immunology
  • Molecular Biology

Background:

  • Alzheimer's disease (AD) involves altered nerve growth factor (NGF) metabolism and increasing interest in immune system roles.
  • Previous studies indicated exogenous NGF therapy may restore cognitive function in AD.
  • The interaction between NGF and immune cells in AD remains largely unexplored.

Purpose of the Study:

  • To investigate the expression of NGF receptors on various immune cells.
  • To explore the functional impact of NGF-TrkA signaling on immune cell responses, particularly in T cells.

Main Methods:

  • Flow cytometry was used to analyze NGF receptor (TrkA) expression on splenic immune cells from C57BL/6 mice.
  • Ex vivo stimulation of splenocytes followed by treatment with NGF was performed.
  • Pro-inflammatory TNF-alpha cytokine levels were measured using flow cytometry post-stimulation and treatment.

Main Results:

  • Nerve growth factor receptor (TrkA) was detected on all examined immune cells, with higher expression on dendritic cells compared to macrophages and NK cells.
  • Adaptive immune cells, including B and T cells, expressed TrkA, with follicular helper T cells and central memory CD4 T cells showing higher levels.
  • Exogenous NGF supplementation reduced TNF-alpha production in stimulated splenic T cells.

Conclusions:

  • All investigated immune cells express the NGF receptor TrkA, indicating their capacity to respond to NGF.
  • NGF-TrkA signaling has the potential to modulate immune responses, specifically by reducing inflammatory cytokine production in T cells.