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2018 ; 14
(1
): 210
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A novel approach to identifying and quantifying neutrophil extracellular trap
formation in septic dogs using immunofluorescence microscopy
#MMPMID29945605
Li RHL
; Johnson LR
; Kohen C
; Tablin F
BMC Vet Res
2018[Jun]; 14
(1
): 210
PMID29945605
show ga
BACKGROUND: Canine neutrophils release neutrophil extracellular traps (NETs) in
response to lipopolysaccharide but NETs from clinical septic dogs had not been
identified. The primary aim is to describe the methodology of identifying and
quantifying neutrophil extracellular traps (NETs) in cytology samples of septic
foci in dogs with sepsis using immunofluorescence microscopy. Cytology
samples including endotracheal tracheal wash (ETW), bronchoalveolar lavage (BAL),
abdominal and pleural effusion collected from 5 dogs (3 septic, 2 non-septic)
were fixed, permeabilized and stained for myeloperoxidase (MPO), citrullinated
histone H3 (citH3) and cell-free DNA (cfDNA). Fluorescence microscopy was used to
identify and quantify NETs in 10 random views at 40× magnification. NETs were
identified based on co-localization of MPO, citH3 and cfDNA. NETs were quantified
as a ratio (number of NETs: number of neutrophils). Neutrophils were identified
based on cytoplasmic MPO, cellular diameter and nuclear morphology. RESULTS: NETs
were identified and quantified in all cytology samples collected from septic
dogs. A small number of NETs was documented in one dog with sterile chronic
bronchitis. No NETs were found in sterile abdominal effusion collected from one
dog with congestive heart failure. CONCLUSIONS: Immunofluorescence microscopy
could be a useful tool for the study of NETs in dogs with clinical sepsis.