Mononuclear but not polymorphonuclear phagocyte depletion increases circulation times and improves mammary tumor-homing efficiency of donor bone marrow-derived monocytes

Francis Combes, Alexandros Marios Sofias, Séan McCafferty, Hanne Huysmans, Joyca De Temmerman, Sjoerd Hak, Evelyne Meyer, Niek N. Sanders

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Tumor associated macrophages are an essential part of the tumor microenvironment. Consequently, bone marrow-derived monocytes (BMDMs) are continuously recruited to tumors and are therefore seen as ideal delivery vehicles with tumor-targeting properties. By using immune cell depleting agents and macroscopic in vivo fluorescence imaging, we demonstrated that removal of endogenous monocytes and macrophages (but not neutrophils) leads to an increased tumor accumulation of exogenously administered BMDMs. By means of intravital microscopy (IVM), we confirmed our macroscopic findings on a cellular level and visualized in real time the migration of the donor BMDMs in the tumors of living animals. Moreover, IVM also revealed that clodronate-mediated depletion drastically increases the circulation time of the exogenously administered BMDMs. In summary, these new insights illustrate that impairment of the mononuclear phagocyte system increases the circulation time and tumor accumulation of donor BMDMs.

Original languageEnglish
Article number1752
JournalCancers
Volume11
Issue number11
DOIs
StatePublished - Nov 2019
Externally publishedYes

Keywords

  • BMDM
  • Clodronate
  • Competition
  • Depletion
  • Fluorescence
  • Intravital microscopy
  • Phagocytes

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