NOX2-dependent immunosuppression in chronic myelomonocytic leukemia.
J Leukoc Biol
; 102(2): 459-466, 2017 08.
Article
em En
| MEDLINE
| ID: mdl-28292946
ABSTRACT
Chronic myelomonocytic leukemia (CMML) is a myeloproliferative and myelodysplastic neoplasm with few treatment options and dismal prognosis. The role of natural killer (NK) cells and other antileukemic lymphocytes in CMML is largely unknown. We aimed to provide insight into the mechanisms of immune evasion in CMML with a focus on immunosuppressive reactive oxygen species (ROS) formed by the myeloid cell NADPH oxidase-2 (NOX2). The dominant population of primary human CMML cells was found to express membrane-bound NOX2 and to release ROS, which, in turn, triggered extensive PARP-1-dependent cell death in cocultured NK cells, CD8+ T effector memory cells, and CD8+ T effector cells. Inhibitors of ROS formation and scavengers of extracellular ROS prevented CMML cell-induced lymphocyte death and facilitated NK cell degranulation toward Ab-coated, primary CMML cells. In patients with CMML, elevation of immature cell counts (CD34+) in blood was associated with reduced expression of several NK cell-activating receptors. We propose that CMML cells may use extracellular ROS as a targetable mechanism of immune escape.
Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Glicoproteínas de Membrana
/
Leucemia Mielomonocítica Crônica
/
Espécies Reativas de Oxigênio
/
Evasão Tumoral
/
NADPH Oxidases
/
Células Mieloides
Limite:
Humans
Idioma:
En
Revista:
J Leukoc Biol
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Suécia