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- Title
Cell-Free DNA and DNase Activity in Dogs with Immune-Mediated Hemolytic Anemia.
- Authors
Jeffery, U.; Ruterbories, L.; Hanel, R.; LeVine, D.N.
- Abstract
Background Immune-mediated hemolytic anemia ( IMHA) in dogs has a high risk of thrombosis and is associated with marked neutrophilia and necrosis. Cell death and release of neutrophil extracellular traps contribute to increased serum concentrations of cell-free DNA, and in human autoimmune disease reduced DNase activity further increases cell-free DNA. Free DNA in blood has prothrombotic properties and could contribute to hypercoagulability in IMHA. Hypothesis Cell-free DNA is elevated and DNase activity reduced in dogs with IMHA compared to healthy dogs. Animals Dogs presenting to two referral hospitals with IMHA (n = 28) and healthy controls (n = 20). Methods Prospective observational study. Blood was collected and death and thrombotic events occurring in the first 14 days after hospitalization recorded. DNA was extracted from plasma with a commercial kit and quantified by PicoGreen fluorescence. DNase activity of serum was measured by radial diffusion assay. Results Cell-free DNA was significantly higher in cases (median: 45 ng/mL, range: 10-2334 ng/mL) than controls (26 ng/mL, range 1-151 ng/mL, P = 0.0084). DNase activity was not different between cases and controls ( P = 0.36). Four cases died and there were five suspected or confirmed thrombotic events. Cell-free DNA concentration was associated with death (odds ratio for upper quartile versus lower 3 quartiles: 15; 95% confidence interval 1.62-201; P = 0.03) but not thrombosis ( P = 0.57). Conclusions and Clinical Importance Cell-free DNA is elevated in dogs with IMHA and likely reflects increased release rather than impaired degradation of DNA. Cell-free DNA concentration is potentially associated with death and might be a prognostic indicator, but this requires confirmation in a larger population.
- Subjects
HEMOLYTIC anemia; NUCLEIC acids; DNA; THROMBOSIS; BLOOD plasma; PROGNOSIS
- Publication
Journal of Veterinary Internal Medicine, 2017, Vol 31, Issue 5, p1441
- ISSN
0891-6640
- Publication type
Article
- DOI
10.1111/jvim.14808