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IFNgamma and TNFalpha account for a pro-clonogenic activity secreted by activated murine peritoneal macrophages

Lido Calorini1, Francesca Bianchini, Antonella Mannini

  • 1Department of Experimental Pathology and Oncology, University of Florence, Italy. lcalorini@unifi.it

Clinical & Experimental Metastasis
|June 18, 2002
PubMed

Insights

Macrophages stimulated by BCG or Listeria release factors that promote melanoma lung colonization and MHC class I expression. Interferon-gamma (IFNγ) and Tumor Necrosis Factor-alpha (TNFα) play key roles in this macrophage pro-clonogenic activity.

Area of Science:

  • Immunology
  • Cancer Biology
  • Cellular Biology

Background:

  • Macrophages play a crucial role in immune responses and cancer progression.
  • Certain macrophage activation methods can influence tumor cell behavior.

Purpose of the Study:

  • To investigate the pro-clonogenic and immune-modulating activities of macrophage-conditioned media.
  • To identify the molecular mediators responsible for these observed activities.

Main Methods:

  • Murine peritoneal macrophages were elicited using BCG or Listeria monocytogenes.
  • Macrophage-conditioned media were analyzed using gel filtration chromatography.
  • The role of cytokines was assessed using polyclonal antibodies against IFNγ and TNFα.

Main Results:

  • Macrophage-conditioned media stimulated B16 melanoma cell lung colonization and MHC class I expression.
  • The pro-clonogenic activity was attributed to factors with molecular weights of 25-52 kDa, characteristic of cytokines.
  • Activity was abolished by anti-IFNγ antibodies and partially inhibited by anti-TNFα antibodies.

Conclusions:

  • Macrophage-conditioned media possess pro-clonogenic activity against melanoma cells.
  • Interferon-gamma (IFNγ) is a key mediator, with Tumor Necrosis Factor-alpha (TNFα) contributing cooperatively.
  • These findings highlight the complex interplay between activated macrophages and tumor progression.

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