Blood monocytes sample MelanA/MART1 antigen for long-lasting cross-presentation to CD8+ T cells after differentiation into dendritic cells.

Abstract:

:Human blood monocytes are very potent to take up antigens. Like macrophages in tissue, they efficiently degrade exogenous protein and are less efficient than dendritic cells (DCs) at cross-presenting antigens to CD8+ T cells. Although it is generally accepted that DCs take up tissue antigens and then migrate to lymph nodes to prime T cells, the mechanisms of presentation of antigens taken up by monocytes are poorly documented so far. In the present work, we show that monocytes loaded in vitro with MelanA long peptides retain the capacity to stimulate antigen-specific CD8+ T cell clones after 5 days of differentiation into monocytes-derived dendritic cells (MoDCs). Tagged-long peptides can be visualized in electron-dense endocytic compartments distinct from lysosomes, suggesting that antigens can be protected from degradation for extended periods of time. To address the pathophysiological relevance of these findings, we screened blood monocytes from 18 metastatic melanoma patients and found that CD14+ monocytes from two patients effectively activate a MelanA-specific CD8 T cell clone after in vitro differentiation into MoDCs. This in vivo sampling of tumor antigen by circulating monocytes might alter the tumor-specific immune response and should be taken into account for cancer immunotherapy.

journal_name

Int J Cancer

authors

Faure F,Jouve M,Lebhar-Peguillet I,Sadaka C,Sepulveda F,Lantz O,Berre S,Gaudin R,Sánchez-Ramón S,Amigorena S

doi

10.1002/ijc.31037

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

133-144

issue

1

eissn

0020-7136

issn

1097-0215

journal_volume

142

pub_type

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