Neutrophil CD64 expression levels in IGRA-positive individuals distinguish latent tuberculosis from active disease
Mem. Inst. Oswaldo Cruz
;
114: e180579, 2019. tab, graf
Artigo
em Inglês
| LILACS
| ID: biblio-1002686
ABSTRACT
BACKGROUND CD64 (FcγR1) is a high-affinity receptor for monomeric IgG1 and IgG3. Circulating neutrophils express very low amounts of CD64 on their surface. OBJECTIVES Our primary aim was to investigate the utility of neutrophil CD64 surface expression as a biomarker of active pulmonary tuberculosis (TB). We hypothesised that elevated neutrophil CD64 expression in TB infection would be associated with interferon gamma (IFN-γ) as an inducer of CD64 expression. METHODS The expression level of CD64 per neutrophil (PMN CD64 index) was quantitatively measured with flow cytometry using a Leuko64 kit in samples from patients with TB and latent TB infection (LTBI) as well as healthy controls, as part of a prospective cohort study in Brazil. FINDINGS The PMN CD64 index in patients with TB was higher than that in healthy controls and LTBI. Receiver operating characteristic curve analyses determined that the PMN CD64 index could discriminate patients with TB from those with LTBI and healthy individuals. PMN CD64 index levels returned to baseline levels after treatment. CONCLUSIONS The positive regulation of CD64 expression in circulating neutrophils of patients with active TB could represent an additional biomarker for diagnosis of active TB and could be used for monitoring individuals with LTBI before progression of TB disease.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Biomarcadores
/
Tuberculose Latente
/
Citometria de Fluxo
Tipo de estudo:
Estudo observacional
/
Fatores de risco
Limite:
Humanos
Idioma:
Inglês
Revista:
Mem. Inst. Oswaldo Cruz
Assunto da revista:
Medicina Tropical
/
Parasitologia
Ano de publicação:
2019
Tipo de documento:
Artigo
/
Documento de projeto
País de afiliação:
Brasil
Instituição/País de afiliação:
Fundação Oswaldo Cruz-Fiocruz/BR
/
Universidade do Estado do Rio de Janeiro/BR
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