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PD-1 blockade attenuates immunosuppressive myeloid cells due to inhibition of CD47/SIRP? axis in HPV negative head and neck squamous cell carcinoma.


ABSTRACT: Myeloid-derived suppressor cells (MDSCs) and tumor associated macrophages (TAMs) play key roles in the tumor immune suppressive network and tumor progression. However, precise roles of programmed death-1 (PD-1) in immunological functions of MDSCs and TAMs in head and neck squamous cell carcinoma (HNSCC) have not been clearly elucidated. In the present study, we show that PD-1 and PD-L1 levels were significantly higher in human HNSCC specimen than in normal oral mucosa. MDSCs and TAMs were characterized in mice and human HNSCC specimen, correlated well with PD-1 and PD-L1 expression. ?PD-1 treatment was well tolerated and significantly reduced tumor growth in the HNSCC mouse model along with significant reduction in MDSCs and TAMs in immune organs and tumors. Molecular analysis suggests a reduction in the CD47/SIRP? pathway by PD-1 blockade, which regulates MDSCs, TAMs, dendritic cell as well as effector T cells. Hence, these data identify that PD-1/PD-L1 axis is significantly increased in human and mouse HNSCC. Adoptive ?PD-1 immunotherapy may provide a novel therapeutic approach to modulate the micro- and macro-environment in HNSCC.

SUBMITTER: Yu GT 

PROVIDER: S-EPMC4747210 | biostudies-literature | 2015 Dec

REPOSITORIES: biostudies-literature

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PD-1 blockade attenuates immunosuppressive myeloid cells due to inhibition of CD47/SIRPα axis in HPV negative head and neck squamous cell carcinoma.

Yu Guang-Tao GT   Bu Lin-Lin LL   Huang Cong-Fa CF   Zhang Wen-Feng WF   Chen Wan-Jun WJ   Gutkind J Silvio JS   Kulkarni Ashok B AB   Sun Zhi-Jun ZJ  

Oncotarget 20151201 39


Myeloid-derived suppressor cells (MDSCs) and tumor associated macrophages (TAMs) play key roles in the tumor immune suppressive network and tumor progression. However, precise roles of programmed death-1 (PD-1) in immunological functions of MDSCs and TAMs in head and neck squamous cell carcinoma (HNSCC) have not been clearly elucidated. In the present study, we show that PD-1 and PD-L1 levels were significantly higher in human HNSCC specimen than in normal oral mucosa. MDSCs and TAMs were charac  ...[more]

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