Inhibition of Tumor Necrosis Factor-α-Inducible Inflammatory Genes by Interferon-γ Is Associated with Altered Nuclear Factor-κB Transactivation and Enhanced Histone Deacetylase Activity

2006 ◽  
Vol 71 (2) ◽  
pp. 609-618 ◽  
Author(s):  
Stefan Keslacy ◽  
Omar Tliba ◽  
Hasna Baidouri ◽  
Yassine Amrani
Keyword(s):  
Tumor Necrosis Factor ◽  
Histone Deacetylase ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Nuclear Factor Κb ◽  
Interferon Γ ◽  
Nuclear Factor ◽  
Inflammatory Genes ◽  
Factor Α ◽  
Necrosis Factor

scholarly journals Interferon-γ and tumor necrosis factor-α induce an immunoinhibitory molecule, B7-H1, via nuclear factor-κB activation in blasts in myelodysplastic syndromes

Blood ◽  
2010 ◽  
Vol 116 (7) ◽  
pp. 1124-1131 ◽  
Author(s):  
Asaka Kondo ◽  
Taishi Yamashita ◽  
Hideto Tamura ◽  
Wanhong Zhao ◽  
Takashi Tsuji ◽  
...  
Keyword(s):  
T Cell ◽  
Tumor Necrosis Factor ◽  
Myelodysplastic Syndromes ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Nuclear Factor Κb ◽  
Interferon Γ ◽  
Nuclear Factor ◽  
Factor Α ◽  
Necrosis Factor

Abstract 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.

Mutant p53 Enhances Nuclear Factor κB Activation by Tumor Necrosis Factor α in Cancer Cells

2007 ◽  
Vol 67 (6) ◽  
pp. 2396-2401 ◽  
Author(s):  
Lilach Weisz ◽  
Alexander Damalas ◽  
Michalis Liontos ◽  
Panagiotis Karakaidos ◽  
Giulia Fontemaggi ◽  
...  
Keyword(s):  
Tumor Necrosis Factor ◽  
Cancer Cells ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Nuclear Factor Κb ◽  
Mutant P53 ◽  
Nuclear Factor ◽  
Factor Α ◽  
Necrosis Factor
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