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Substance P and stress-induced changes in macrophages
C Chancellor-Freeland1, G F Zhu, R Kage
1Department of Microbiology, Boston University School of Medicine, Massachusetts 02118, USA.
Annals of the New York Academy of Sciences
|December 29, 1995
Summary
Stress impacts macrophage function via Substance P (SP), a neuropeptide. SP influences cytokine production and inflammatory responses, particularly under stress conditions, linking the nervous, endocrine, and immune systems.
Area of Science:
- Neuroimmunology
- Stress Physiology
- Macrophage Biology
Background:
- The nervous, endocrine, and immune systems are interconnected.
- Macrophages are crucial immune cells sensitive to stress.
- Substance P (SP) is a neuropeptide implicated in inflammation.
Purpose of the Study:
- To investigate the role of Substance P (SP) in stress-induced alterations of macrophage function.
- To elucidate the mechanisms linking stress, SP, and immune responses.
Main Methods:
- Examined SP receptor binding and SP levels in peritoneal macrophages under stress.
- Utilized SP antagonists and capsaicin pretreatment to assess SP's role in vivo and in vitro.
- Measured cytokine production (IL-1, IL-6, TNF-alpha) in macrophages from stressed and control animals.
Main Results:
- Stress altered SP receptor binding and increased SP levels in peritoneal macrophages.
- SP enhanced lipopolysaccharide (LPS)-induced TNF-alpha production in macrophages from stressed animals.
- Capsaicin pretreatment reduced stress-induced elevations in TNF-alpha and IL-6.
Conclusions:
- Stress can initiate or exacerbate inflammatory responses.
- Substance P (SP) plays a significant role in mediating stress-induced alterations in macrophage function and cytokine production.
- SP is a key link between stress and neuro-endocrine-immune system interactions.