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- W1794357844 abstract "Human leukocyte antigen-G (HLA-G) expression by tumors has been evidenced in numerous malignancies in association with poor prognosis and resistance to immunotherapy in humans. Particularly, soluble form of HLA-G was measured at high concentrations in malignant effusions and plasma from cancer patients, and inhibits antitumor immune cells in vitro through interaction with immunoglobulin-like transcript (ILT) receptors. Nevertheless, in vivo study demonstrating that HLA-G secretion by tumor cells allows their escape from immunosurveillance remained to be established. Despite nondescribed murine homolog, direct functional interaction of HLA-G with murine paired immunoglobulin-like receptor (PIR)-B, ortholog of human ILT receptors, enables to investigate its role in vivo. Immunocompetent mice were injected either with syngeneic tumor cells co-expressing HLA-G5, the main soluble HLA-G isoform, and the conformation stabilizer human β2-microglubulin (hβ2m), or with hβ2m+ HLA-G5- tumor cells. hβ2m expressed at both tumor cell surface acted as a tumor antigen triggering a specific humoral response. Interestingly, although hβ2m+ HLA-G5- tumors were rejected, secreted HLA-G5 provided hβ2m+ HLA-G5+ tumors a protection against hβ2m-elicited immune rejection, enabling such immunogenic tumors to grow similarly to a poorly immunogenic tumor. HLA-G5 tumor expression was associated with local and peripheral immunosuppression, characterized by dampened anti-hβ2m B-cell response, quantitative and functional T-and B-cell defects, accumulation of myeloid-derived suppressor cells able to inhibit T-cell proliferation and reduced T- and B-cell tumor infiltrate. Our study provides the first in vivo proof that soluble HLA-G counteracts tumor rejection and reinforces the importance to consider HLA-G as a promising target to optimize current cancer immunotherapies." @default.
- W1794357844 created "2016-06-24" @default.
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- W1794357844 date "2014-04-07" @default.
- W1794357844 modified "2023-10-15" @default.
- W1794357844 title "<i>In vivo</i> evidence that secretion of HLA‐G by immunogenic tumor cells allows their evasion from immunosurveillance" @default.
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- W1794357844 doi "https://doi.org/10.1002/ijc.28845" @default.
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