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2016 ; 5
(2
): e1062208
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English Wikipedia
Expansion of myeloid derived suppressor cells correlates with number of T
regulatory cells and disease progression in myelodysplastic syndrome
#MMPMID27057428
Kittang AO
; Kordasti S
; Sand KE
; Costantini B
; Kramer AM
; Perezabellan P
; Seidl T
; Rye KP
; Hagen KM
; Kulasekararaj A
; Bruserud Ø
; Mufti GJ
Oncoimmunology
2016[Feb]; 5
(2
): e1062208
PMID27057428
show ga
Although the role of CD4(+) T cells and in particular Tregs and Th17 cells is
established in myelodysplastic syndrome(MDS), the contribution of other
components of immune system is yet to be elucidated fully. In this study we
investigated the number and function of myeloid derived suppressor cells (MDSCs)
in fresh peripheral blood and matched bone marrow samples from 42 MDS patients
and the potential correlation with risk of disease progression to acute myeloid
leukemia (AML). In peripheral blood, very low-/low risk patients had
significantly lower median MDSC number (0.16×10(9)/L(0.03-0.40)) compared to
intermediate-/high-/very high risk patients, in whom median MDSC counts was
0.52×10(9)/L(0.10-1.78), p < 0.005. When co-cultured with CD4+ effector T-cells
(T-effectors), MDSCs suppress Teffector proliferation in both allogeneic and
autologous settings. There was a positive correlation between the number of Tregs
and MDSCs (Spearman R = 0.825, p < 0.005) in high risk and not low risk patients.
We also investigated MDSCs' expression of bone marrow-homing chemokine receptors,
and our data shows that MDSCs from MDS patients express both CXCR4 and CX3CR1
which might facilitate migration of MDSCs to bone marrow. Monocytic
MDSCs(M-MDSCs) which are more frequent in the peripheral blood express higher
levels of CX3CR1 and CXCR4 than the granulocytic subtype (G-MDSCs), and
circulating M-MDSCs had significantly higher CX3CR1 expression compared to
bone-marrow M-MDSCs in intermediate-/high-/very high risk MDS. Our results
suggest that MDSCs contribute significantly to the dysregulation of immune
surveillance in MDS, which is different between low and high risk disease. It
further points at mechanisms of MDSCs recruitment and contribution to the bone
marrow microenvironment.