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Br J Cancer ; 117(3): 385-397, 2017 Jul 25.
Artigo em Inglês | MEDLINE | ID: mdl-28632731

RESUMO

BACKGROUND: Non-small-cell lung cancer (NSCLC) patients often exhibit neutrophilia, which has been associated with poor clinical outcomes. However, the mechanisms that lead to neutrophilia have not been fully established. CD47 is an antiphagocytic molecule that promotes neutrophil recruitment. METHODS: Blood was collected from 50 treatment-naive patients with advanced NSCLC and from 25 healthy subjects. The frequency of CD66b+ cells and the expression of CD47 were determined by flow cytometry. Neutrophil apoptosis was determined by 7-amino-actinomycin D/Annexin V-APC staining. Phagocytosis was assessed by flow cytometry. Reactive oxygen species production after phorbol 12-myristate 13-acetate treatment was quantified by 2',7'-dichlorofluorescein fluorescence. Pro-inflammatory plasma cytokines were quantified using a cytometric bead array assay. RESULTS: The percentage of circulating neutrophils was significantly higher in patients than in controls (P<0.001). Patient-derived neutrophils had a higher oxidative potential than those of controls (P=0.0286). The number of neutrophils in late apoptosis/necrosis was lower in patients than in controls (P=0.0317). Caspase 3/7 activation was also lower in patients than in controls (P=0.0079). CD47 expression in whole-blood samples and in the neutrophil fraction was higher in NSCLC patients than in controls (P=0.0408 and P<0.001). Patient-derived neutrophils were phagocytosed at a lower rate than those of controls (P=0.0445). CD47 expression in neutrophils negatively correlated with their ingestion by macrophages (P=0.0039). High CD47 expression was associated with a lower overall survival. CONCLUSIONS: Increased CD47 expression on the surface of neutrophils was associated with a delay in neutrophil apoptosis and with an impairment in their phagocytic clearance by macrophages, suggesting that CD47 overexpression may be one of the underlying mechanisms leading to neutrophilia in NSCLC patients.


Assuntos
Antígeno CD47/sangue , Carcinoma Pulmonar de Células não Pequenas/sangue , Neoplasias Pulmonares/sangue , Neutrófilos/metabolismo , Adulto , Idoso , Antígenos CD/análise , Apoptose , Estudos de Casos e Controles , Caspase 3/metabolismo , Caspase 7/metabolismo , Moléculas de Adesão Celular/análise , Citocinas/sangue , Feminino , Proteínas Ligadas por GPI/análise , Humanos , Contagem de Leucócitos , Masculino , Pessoa de Meia-Idade , Neutrófilos/química , Neutrófilos/fisiologia , Fagocitose , Prognóstico , Espécies Reativas de Oxigênio/metabolismo , Taxa de Sobrevida
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