2022
DOI: 10.3389/fimmu.2022.830871
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Ex Vivo and In Vitro Analysis Identify a Detrimental Impact of Neutrophil Extracellular Traps on Eye Structures in Equine Recurrent Uveitis

Abstract: Equine recurrent uveitis (ERU) is a common ocular disease of horses and described as a model for human autoimmune uveitis. This immune-mediated, inflammatory condition progressively destroys the eye, ultimately leading to blindness. Genetic and autoimmune factors, next to infections with Leptospira, are discussed as key factors in the pathogenesis. Furthermore, a release of neutrophil extracellular traps (NETs) by activated neutrophils is involved. NETs are composed of decondensed chromatin and proteins that c… Show more

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Cited by 8 publications
(11 citation statements)
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References 113 publications
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“…Myeloperoxidase (MPO) is one of the main antimicrobial components that can be found attached to NETs. In the form of histone–MPO complexes, it serves as a very specific NET marker as these complexes are not formed under necrotic circumstances ( 26 , 32 ). Significantly higher amounts of histone–MPO complexes were detected in IAV-positive BALF compared with controls ( Figure 2C ).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Myeloperoxidase (MPO) is one of the main antimicrobial components that can be found attached to NETs. In the form of histone–MPO complexes, it serves as a very specific NET marker as these complexes are not formed under necrotic circumstances ( 26 , 32 ). Significantly higher amounts of histone–MPO complexes were detected in IAV-positive BALF compared with controls ( Figure 2C ).…”
Section: Resultsmentioning
confidence: 99%
“…The assays were performed according to the manufacturer’s recommendations. A sandwich ELISA for the detection of histone–MPO complexes was performed as described before ( 26 ).…”
Section: Methodsmentioning
confidence: 99%
“…16 Non-infectious and immune-mediated diseases can also be associated with NET release, 14 and in horses this has included equine asthma 32,72 and recurrent uveitis. 21,22 The presence of NETs in septic equine synovial fluid (SF) and peritoneal fluid (PF) samples is unknown, and therefore it is unclear if those fluids could be of use in the diagnosis of infection or septic inflammation and for predicting prognosis. Diagnosis of septic inflammation can be challenging using routine laboratory methods given overlapping results for non-septic and septic processes.…”
Section: Full Scientific Reportmentioning
confidence: 99%
“…There are investigations about vitreous body fluids (VBF), sera, and ocular histological sections from horses with or without ERU. Interestingly, several NETs markers in sera of ERU, such as free DNA, histone-complexes, and MPO, show a higher level in the samples from ERU horses compared to healthy horses, implying NETs are involved in the pathogenesis of ERU [ 93 , 94 ]. As the potential NETs-inducing factors, equine cathelicidins are up-regulated in the VBF of ERU-diseased horses.…”
Section: Uveitismentioning
confidence: 99%
“…These pro-inflammatory cytokines mediate the formation of NETs and the production of adenosine monophosphate (AMP), resulting in the occurrence of ERU. Leptospira, which induces NETs in a concentration-dependent manner in the VBF of ERU-diseased horses, is another contributor to the pathogenesis of ERU [ 93 , 96 ]. However, little is known about whether NETs contribute to the pathogenesis of ERU.…”
Section: Uveitismentioning
confidence: 99%