期刊
LEUKEMIA
卷 36, 期 1, 页码 165-176出版社
SPRINGERNATURE
DOI: 10.1038/s41375-021-01321-2
关键词
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资金
- Leukemia & Lymphoma Society (LLS)
- National Institutes of Health [P50 CA97274]
- Predolin Foundation
AITL is an aggressive lymphoid malignancy with a unique tumor microenvironment characterized by a minority population of malignant TFH cells and a diverse infiltrate of immune cells. Non-malignant populations within the TME, such as B cells and CD8+ T cells, are increasingly recognized for their potential role in AITL biology. These non-malignant populations exhibit specific expression patterns that may contribute to the understanding of AITL pathogenesis.
Angioimmunoblastic T-cell lymphoma (AITL) is an aggressive lymphoid malignancy associated with a poor clinical prognosis. The AITL tumor microenvironment (TME) is unique, featuring a minority population of malignant CD4+ T follicular helper (TFH) cells inter-mixed with a diverse infiltrate of multi-lineage immune cells. While much of the understanding of AITL biology to date has focused on characteristics of the malignant clone, less is known about the many non-malignant populations that comprise the TME. Recently, mutational consistencies have been identified between malignant cells and non-malignant B cells within the AITL TME. As a result, a significant role for non-malignant populations in AITL biology has been increasingly hypothesized. In this study, we have utilized mass cytometry and single-cell transcriptome analysis to identify several expanded populations within the AITL TME. Notably, we find that B cells within the AITL TME feature decreased expression of key markers including CD73 and CXCR5. Furthermore, we describe the expansion of distinct CD8+ T cell populations that feature an exhausted phenotype and an underlying expression profile indicative of dysfunction, impaired cytotoxicity, and upregulation of the chemokines XCL2 and XCL1.
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