University Of Tasmania
131519 - TNF may negatively regulate phagocytosis - Final author version .pdf (205.84 kB)

TNF may negatively regulate phagocytosis of Devil Facial Tumour Disease cells by activated macrophages

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posted on 2023-05-20, 02:01 authored by Li, X, Jocelyn DarbyJocelyn Darby, Alan LyonsAlan Lyons, Gregory WoodsGregory Woods, Heinrich KornerHeinrich Korner
Introduction: Macrophage phagocytosis of pathogens and tumour cells is an important early event in protection against infectious disease and cancer. As tumour necrosis factor α (TNF) is an important cytokine in macrophage activation, we investigated the involvement of TNF in macrophage phagocytosis of tumour cells.

Methods: We used Devil Facial Tumour Disease (DFTD) cancer cells as the target tumour cells. The Tasmanian devil (Sarcophilus harrisii) population is threatened by the transmissible DFTD. Using DFTD cells provided the opportunity to determine if these cells can be phagocytosed and investigate requirement for TNF. As effector cells, bone marrow derived macrophages (BMDMs), generated from C57BL/6 wild type (B6.WT) and C57BL/6 TNF-/- (B6.TNF-/-) mice were used. Phagocytosis of DFTD cells was investigated by confocal microscopy and flow cytometry.

Results: DFTD cells were consistently phagocytosed by B6.WT and B6.TNF-/- BMDMs with similar efficiency in vitro. Consequently the DFTD cells are not resistant to phagocytosis. Following activation by exposure to IFNγ and LPS or LPS alone, B6.TNF-/- BMDMs had higher phagocytic efficiency and lower nitric oxide (NO) production compared to wild-type controls. In addition, NO seems to be unlikely to be the involved in phagocytosis efficiency in IFNγ and LPS activated B6.TNF-/- macrophages and consequences thereof.

Conclusion: Our results indicate that TNF is not required for IFNγ and LPS or LPS alone activation of macrophage phagocytosis. TNF may negatively regulate macrophage phagocytosis of tumour cells.


Publication title

Immunological Investigations










Menzies Institute for Medical Research


Marcel Dekker Inc

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270 Madison Ave, New York, USA, Ny, 10016

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© 2018 Taylor & Francis. This is an Accepted Manuscript of an article published by Taylor & Francis in Immunological investigations on 19/1/19, available online:

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Terrestrial biodiversity

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