TY - JOUR
T1 - Interferon-γ and tumor necrosis factor-α induce an immunoinhibitory molecule, B7-H1, via nuclear factor-κB activation in blasts in myelodysplastic syndromes
AU - Kondo, Asaka
AU - Yamashita, Taishi
AU - Tamura, Hideto
AU - Zhao, Wanhong
AU - Tsuji, Takashi
AU - Shimizu, Masumi
AU - Shinya, Eiji
AU - Takahashi, Hidemi
AU - Tamada, Koji
AU - Chen, Lieping
AU - Dan, Kazuo
AU - Ogata, Kiyoyuki
PY - 2010/8/19
Y1 - 2010/8/19
N2 - During disease progression in myelodysplastic syndromes (MDS), clonal blasts gain a more aggressive nature, whereas nonclonal immune cells become less efficient via an unknown mechanism. Using MDS cell lines and patient samples, we showed that the expression of an immunoinhibitory molecule, B7-H1 (CD274), was induced by interferon-γ (IFNγ) and tumor necrosis factor-α (TNFα) on MDS blasts. This induction was associated with the activation of nuclear factor-κB (NF-κB) and nearly completely blocked by an NF-κB inhibitor, pyrrolidine dithiocarbamate (PDTC). B7-H1+ MDS blasts had greater intrinsic proliferative capacity than B7-H1- MDS blasts when examined in various assays. Furthermore, B7-H1+ blasts suppressed T-cell proliferation and induced T-cell apoptosis in allogeneic cocultures. When fresh bone marrow samples from patients were examined, blasts from high-risk MDS patients expressed B7-H1 molecules more often compared with those from low-risk MDS patients. Moreover, MDS T cells often overexpressed programmed cell death 1 (PD-1) molecules that transmit an inhibitory signal from B7-H1 molecules. Taken together, these findings provide new insight into MDS pathophysiology. IFNγ and TNFα activate NF-κB that in turn induces B7-H1 expression on MDS blasts. B7-H1+ MDS blasts have an intrinsic proliferative advantage and induce T-cell suppression, which may be associated with disease progression in MDS.
AB - During disease progression in myelodysplastic syndromes (MDS), clonal blasts gain a more aggressive nature, whereas nonclonal immune cells become less efficient via an unknown mechanism. Using MDS cell lines and patient samples, we showed that the expression of an immunoinhibitory molecule, B7-H1 (CD274), was induced by interferon-γ (IFNγ) and tumor necrosis factor-α (TNFα) on MDS blasts. This induction was associated with the activation of nuclear factor-κB (NF-κB) and nearly completely blocked by an NF-κB inhibitor, pyrrolidine dithiocarbamate (PDTC). B7-H1+ MDS blasts had greater intrinsic proliferative capacity than B7-H1- MDS blasts when examined in various assays. Furthermore, B7-H1+ blasts suppressed T-cell proliferation and induced T-cell apoptosis in allogeneic cocultures. When fresh bone marrow samples from patients were examined, blasts from high-risk MDS patients expressed B7-H1 molecules more often compared with those from low-risk MDS patients. Moreover, MDS T cells often overexpressed programmed cell death 1 (PD-1) molecules that transmit an inhibitory signal from B7-H1 molecules. Taken together, these findings provide new insight into MDS pathophysiology. IFNγ and TNFα activate NF-κB that in turn induces B7-H1 expression on MDS blasts. B7-H1+ MDS blasts have an intrinsic proliferative advantage and induce T-cell suppression, which may be associated with disease progression in MDS.
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U2 - 10.1182/blood-2009-12-255125
DO - 10.1182/blood-2009-12-255125
M3 - Article
C2 - 20472834
AN - SCOPUS:77956527537
VL - 116
SP - 1124
EP - 1131
JO - Blood
JF - Blood
SN - 0006-4971
IS - 7
ER -