4.7 Article

PD-L1+CD8+ T cells enrichment in lung cancer exerted regulatory function and tumor-promoting tolerance

期刊

ISCIENCE
卷 25, 期 2, 页码 -

出版社

CELL PRESS
DOI: 10.1016/j.isci.2022.103785

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资金

  1. National Natural Science Foundation of China [81873863, 82071753, 81672363, 81871448, 22077079]
  2. Shanghai Municipal Education Commission-Gaofeng Clinical Medicine Grant Support [20161315]
  3. Key Specialty Development Program of Xin Hua Hospital
  4. Shanghai Municipal Health Commission
  5. Medicine and Engineering Cross Research Foundation of Shanghai Jiao Tong University [YG2017ZD02]
  6. Clinical Research Plan of SHDC [16CR3057A]

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We discovered an enrichment of PD-L1(+)CD8(+) T cells in lung cancer, which were spatially localized with PD-1(+)CD8(+) T cells. These PD-L1(+)CD8(+) T cells exhibited regulatory functions that inhibited the proliferation and cytotoxic abilities of other CD8(+) T cells through the PD-L1/PD-1 axis. Tumor-derived IL-27 was found to promote the development of PD-L1(+)CD8(+) T cells through STAT1/STAT3 signaling, leading to downregulation of the adaptive immune response.
Immunotherapy targeting checkpoint blockade to rescue T cells from exhaustion has become an essential therapeutic strategy in treating cancers. Till now, little is known about the PD-L1 graphic pattern and characteristics in CD8(+) T cells. We combined cytometry by time-of-flight (CyTOF) and imaging mass cytometry (IMC) approaches to analyze CD8(+) T cells from primary lung cancers and discovered that PD-L1(+)CD8(+) T cells were enriched in tumor lesions, spatially localized with PD-1+CD8(+) T cells. Furthermore, PD-L1(+)CD8(+) T cells exerted regulatory functions that inhibited CD8(+) T cells proliferation and cytotoxic abilities through the PD-L1/PD-1 axis. Moreover, tumor-derived IL-27 promotes PD-L1(+)CD8(+) T cells development through STAT1/STAT3 signaling. Single-cell RNA sequencing data analysis further clarified PD-L1(+)CD8(+) T cells elevated in the components related to downregulation of adaptive immune response. Collectively, our data demonstrated that PD-L1(+)CD8(+) T cells enriched in lung cancer engaged in tolerogenic effects and may become a therapeutic target in lung cancer.

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