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Treg and Oligoclonal Expansion of Terminal Effector CD8 T Cell As Key Players in Multiple Myeloma

Overview
Journal Front Immunol
Date 2021 Mar 12
PMID 33708212
Citations 12
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Abstract

The classical paradigm of host-tumor interaction, i.e. elimination, equilibrium, and escape (EEE), is reflected in the clinical behavior of myeloma which progresses from the premalignant condition, Monoclonal Gammopathy of Unknown Significance (MGUS). Despite the role of other immune cells, CD4 regulatory T cells (Treg) and cytotoxic CD8 T cells have emerged as the dominant effectors of host control of the myeloma clone. Progression from MGUS to myeloma is associated with alterations in Tregs and terminal effector CD8 T cells (T). These changes involve CD39 and CD69 expression, affecting the adenosine pathway and residency in the bone marrow (BM) microenvironment, together with oligoclonal expansion within CD8 T cells. In this mini-review article, in the context of earlier data, we summarize our recent understanding of Treg involvement in the adenosine pathway, the significance of oligoclonal expansion within CD8 T cells and BM-residency of CD8 T cells in MGUS and newly diagnosed multiple myeloma patients.

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