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- W2980680922 abstract "The investigation of the differentiation of terminal effector CD8+CD57+T cells (TTE) in multiple myeloma (MM) and its premalignant stage, monoclonal gammopathy of undetermined significance (MGUS), is essential for understanding myeloma immune escape. We have previously shown that patients with clonal expansions of cytotoxic TTE cells have better outcomes than those who do not, but have not examined the underlining differentiation of TTE cells that leads to these distinct states. We hypothesised that a lack of clonally expanded TTE cells in myeloma patients could be due to myeloma induced alterations of TTE cell differentiation. To define TTE cell differentiation at high resolution, we have analysed paired bone marrow (BM) and peripheral blood (PB) samples from patients with newly diagnosed Myeloma (NDMM) and MGUS using time of flight mass cytometry and unsupervised clustering algorithm Flow Self-organizing Map (FlowSOM). We designed a 39 antibody panel, including antibodies to TCR-Vβ families custom-labelled with heavy metals, allowing the detailed characterization of the phenotype of clonally expanded TTE cells. We found that in contrast to TTE cells in MGUS, TTE cells in BM of NDMM failed to display the phenotype typical of terminal effector cell differentiation and were enriched in atypical tissue resident CD69+, CD28+ and CD27+ subsets. They also failed to display the expected upregulation of CD45RA and downregulation of CD45RO expression. Moreover the accumulation of atypical CD69+ TTE cells was prevalent in myeloma patients without clonally expanded TTE cells. FlowSOM clustering discovered 4 metaclusters (MC) contributing to the accumulation of CD69+ TTE cells in the BM of NDMM patients. Phenotypically, two MC were in the memory stage based on CD27, CD28 and CD45RO expression and another two MC showed evidence of progression to the effector stage by downregulating CD27, CD28, CD45RO and upregulating CD45RA expression. Progression to the effector stage was associated with downregulation of CD38 and PD-1 expression, but did not affect persistent TIGIT expression. Vβ expanded TTE cells did not contribute to the accumulation of CD69+ TTE cells and occupied phenotypically different MC with low or undetectable CD69 expression. When comparing phenotype of Vβ expanded TTE cells to remaining TTE cells, effector and memory CD8+T cells they had higher Tbet, Perforin, Granzyme B, and lower levels of Eomes, TIGIT and PD-1 expression arguing against their exhaustion stage and confirming our previous observations that they resemble senescent cells Our results suggest that accumulation of atypical tissue resident CD69+ TTE cells in myeloma infiltrated BM could prevent differentiation and expansion of clonal myeloma specific CD8+TTE cells and ultimately contribute to myeloma immune escape." @default.
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- W2980680922 date "2019-10-01" @default.
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- W2980680922 title "Accumulation of CD69+ Terminal Effector CD8+ T cells occurs in the bone marrow of newly diagnosed Myeloma patients who lack protective clonal Vb expanded cytotoxic T cells" @default.
- W2980680922 doi "https://doi.org/10.1016/j.clml.2019.09.043" @default.
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