Related Experiment Video

Updated: Jul 8, 2026

Conditional Knockdown of Gene Expression in Cancer Cell Lines to Study the Recruitment of Monocytes/Macrophages to the Tumor Microenvironment
10:59

Conditional Knockdown of Gene Expression in Cancer Cell Lines to Study the Recruitment of Monocytes/Macrophages to the Tumor Microenvironment

Published on: November 23, 2017

Spermine inhibition of monocyte activation and inflammation

M Zhang1, L V Borovikova, H Wang

  • 1The Picower Institute for Medical Research, Manhasset, New York 11030, USA. mzhang@picower.edu

Molecular Medicine (Cambridge, Mass.)
|November 7, 1999
PubMed

Insights

Spermine, a natural compound, limits the innate immune response by reducing inflammatory cytokine production in monocytes. This mechanism is crucial for preventing excessive tissue damage during inflammation and in tumors.

Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • The innate immune system, including monocytes and macrophages, protects against pathogens but can cause collateral tissue damage through proinflammatory mediators like TNF and NO.
  • Anti-inflammatory mediators are essential for controlling innate immune responses and preventing excessive tissue injury.
  • Spermine, a biogenic polyamine, is known to suppress monocyte proinflammatory cytokine synthesis, potentially acting as a counterregulatory mechanism in conditions like infection, injury, and tumors.

Purpose of the Study:

  • To investigate the role of spermine uptake in monocyte deactivation.
  • To elucidate the mechanism by which spermine inhibits monocyte proinflammatory cytokine synthesis.
  • To determine the in vivo relevance of spermine-mediated inhibition of innate immune responses.

Main Methods:

  • Monocyte spermine uptake was measured following lipopolysaccharide (LPS) stimulation.
  • The polyamine analogue 1,4-bis(3-aminopropyl)-piperazine (BAP) was used to inhibit spermine uptake.
  • Macrophage TNF synthesis was assessed in the presence of spermine and BAP.
  • Carrageenan-induced paw edema and nitric oxide release were measured in vivo following BAP administration.

Main Results:

  • Monocyte spermine uptake significantly increased after LPS stimulation.
  • BAP inhibited LPS-stimulated monocyte spermine uptake, indicating the involvement of a nonselective polyamine transporter.
  • BAP treatment restored macrophage TNF synthesis despite the presence of spermine, confirming that spermine's deactivating effect depends on its uptake.
  • In vivo administration of BAP enhanced carrageenan-induced paw edema and nitric oxide release.

Conclusions:

  • Endogenous spermine normally inhibits the innate inflammatory response by suppressing macrophage activation.
  • Spermine's inhibitory effect on monocytes is dependent on its cellular uptake via a nonselective polyamine transporter.
  • Targeting spermine uptake represents a potential strategy for modulating inflammatory responses.

More Related Videos

Isolation Protocol of Mouse Monocyte-derived Dendritic Cells and Their Subsequent In Vitro Activation with Tumor Immune Complexes11:48

Isolation Protocol of Mouse Monocyte-derived Dendritic Cells and Their Subsequent In Vitro Activation with Tumor Immune Complexes

Published on: May 31, 2018

Quantification of Monocyte Chemotactic Activity In Vivo and Characterization of Blood Monocyte Derived Macrophages09:57

Quantification of Monocyte Chemotactic Activity In Vivo and Characterization of Blood Monocyte Derived Macrophages

Published on: August 12, 2019

Related Concept Videos

Differentiation of Common Myeloid Progenitor Cells01:15

Differentiation of Common Myeloid Progenitor Cells

Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...