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Published in: Cancer Immunology, Immunotherapy 9/2019

01-09-2019 | Melanoma | Original Article

Melanoma-conditioned medium promotes cytotoxic immune responses by murine bone marrow-derived monocytes despite their expression of ‘M2’ markers

Authors: Liam Friel Tremble, Anne C. Moore, Patrick F. Forde

Published in: Cancer Immunology, Immunotherapy | Issue 9/2019

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Abstract

Macrophages have been shown to infiltrate a wide range of malignancies and are often considered to promote tumour survival, growth and spread. However, the source and behaviour of discrete tumour-associated macrophage populations are still poorly understood. Here we show a novel method for the rational development of bone marrow-derived monocytes appropriate for the study of processes which involve the contribution of circulating inflammatory monocytes. We have shown that in response to tumour-conditioned medium, these cells upregulate CD206 and CD115, markers traditionally associated with M2-type macrophages. Treated cells show reduced capacity for cytokine secretion but significantly impact CD4+ and CD8+ T-cell proliferation and polarization. Coculture with conditioned bone marrow-derived monocytes significantly reduced CD4+ T-cell proliferation but increased CD8+ T-cell proliferation and granzyme B expression with significant induction of IFNγ secretion by both CD4+ and CD8+ T cells, indicating that these cells may have a role in promoting anti-cancer immunity.
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Metadata
Title
Melanoma-conditioned medium promotes cytotoxic immune responses by murine bone marrow-derived monocytes despite their expression of ‘M2’ markers
Authors
Liam Friel Tremble
Anne C. Moore
Patrick F. Forde
Publication date
01-09-2019
Publisher
Springer Berlin Heidelberg
Keywords
Melanoma
Melanoma
Published in
Cancer Immunology, Immunotherapy / Issue 9/2019
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-019-02381-1

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