Abstract:
:The five-year survival rate of melanoma worsens significantly with advancing tumor stage. We hypothesized that regulatory B cells (Breg) might have participated in the pathogenesis of melanoma. In this study, the PD-L1+ Breg cells were investigated. The expression of PD-L1 by circulating B cells was very low in healthy controls. In melanoma patients, on the other hand, the expression of PD-L1 by circulating B cells was significantly elevated in a manner that was positively associated with tumor stage, with the highest level in stage IV bone metastasis patients. Compared to total B cells, PD-L1+ B cells presented higher IgM and higher IgD expression, and were almost exclusively CD20+CD27-, suggesting that the PD-L1+ B cells exhibited a naive B cell-like phenotype. Healthy naive B cells, which presented little PD-L1, and stage I and stage II melanoma patient naive B cells, which presented detectable but low PD-L1, were unable to suppress T cell response. However, stage III and stage IV naive B cells, which presented moderate PD-L1, could significantly suppress T cell response in a PD-L1-dependent manner. We further found that the level of PD-L1+ B cells was significantly higher in bone metastasis than in the primary tumors. Overall, we demonstrated that PD-L1+ B cells were upregulated in advanced melanoma and were enriched in metastasis compared to primary tumors. Furthermore, PD-L1+ naive B cells could act as a T cell suppressor in a PD-L1-dependent manner.
journal_name
Mol Immunoljournal_title
Molecular immunologyauthors
Wu H,Xia L,Jia D,Zou H,Jin G,Qian W,Xu H,Li Tdoi
10.1016/j.molimm.2020.01.008subject
Has Abstractpub_date
2020-03-01 00:00:00pages
83-91eissn
0161-5890issn
1872-9142pii
S0161-5890(19)30572-3journal_volume
119pub_type
杂志文章abstract::Protein kinases have been implicated in a number of regulatory mechanisms including signal transduction in many cells. To address the possibility that the large granular lymphocyte (LGL) also uses one or more unique protein kinases for LGL functions, an efficient method was developed to obtain partial cDNA clones for ...
journal_title:Molecular immunology
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journal_title:Molecular immunology
pub_type: 杂志文章,评审
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1016/0161-5890(90)90140-u
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pub_type: 杂志文章
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