The cellular and molecular origin of tumor-associated macrophages Academic Article uri icon


MeSH Major

  • Macrophages
  • Mammary Neoplasms, Animal


  • Long recognized as an evolutionarily ancient cell type involved in tissue homeostasis and immune defense against pathogens, macrophages are being rediscovered as regulators of several diseases, including cancer. Here we show that in mice, mammary tumor growth induces the accumulation of tumor-associated macrophages (TAMs) that are phenotypically and functionally distinct from mammary tissue macrophages (MTMs). TAMs express the adhesion molecule Vcam1 and proliferate upon their differentiation from inflammatory monocytes, but do not exhibit an "alternatively activated" phenotype. TAM terminal differentiation depends on the transcriptional regulator of Notch signaling, RBPJ; and TAM, but not MTM, depletion restores tumor-infiltrating cytotoxic T cell responses and suppresses tumor growth. These findings reveal the ontogeny of TAMs and a discrete tumor-elicited inflammatory response, which may provide new opportunities for cancer immunotherapy.

publication date

  • January 2014



  • Academic Article



  • eng

PubMed Central ID

  • PMC4204732

Digital Object Identifier (DOI)

  • 10.1126/science.1252510

PubMed ID

  • 24812208

Additional Document Info

start page

  • 921

end page

  • 5


  • 344


  • 6186