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The effect of substance P on nitric oxide production by HSV-1 infected macrophages

Roya Yaraee1, Massoumeh Ebtekar, Abolhassan Ahmadiani

  • 1Department of Immunology, Medical Faculty, Shahed University, Tehran, Iran. yaraee@shahed.ac.ir

International Immunopharmacology
|December 21, 2006
PubMed

Insights

Substance P (SP) boosts nitric oxide (NO) production in macrophages, but this effect wanes after 24 hours. SP also amplifies herpes simplex virus (HSV) cytopathic effects over time, highlighting SP's role in innate immunity.

Area of Science:

  • Neuroimmunology
  • Infectious Diseases

Background:

  • Neuro-immune pathways regulate infectious disease states, offering therapeutic potential.
  • Substance P (SP) is a neurotransmitter implicated in immune responses.

Purpose of the Study:

  • To investigate the effect of SP on nitric oxide (NO) production in HSV-infected macrophages.
  • To determine the relationship between SP, NO production, and the cytopathic effect of HSV over time.
  • To assess the impact of SP pretreatment on macrophage susceptibility to HSV.

Main Methods:

  • Macrophages were infected with HSV, and NO production was measured.
  • The cytopathic effect of HSV in the presence of SP was evaluated over different time points.
  • Macrophages were pretreated with SP before HSV infection to assess protective effects.

Main Results:

  • SP enhanced NO production in both HSV- and mock-infected macrophages, with diminished effect after 24 hours.
  • SP significantly increased HSV cytopathic effects in a time-dependent manner, peaking at 10 hours post-stimulation.
  • Pretreatment of macrophages with SP did not significantly alter HSV-1 cytopathic effects.

Conclusions:

  • The neurotransmitter SP modulates macrophage function in both healthy and HSV-infected states.
  • SP plays a significant role in innate immunity processes during viral infections.
  • SP influences NO production and viral cytopathicity, suggesting a complex regulatory role in neuro-immune interactions.

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