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• W2004169530 endingPage "125" @default.
• W2004169530 startingPage "107" @default.
• W2004169530 abstract "During mastitis and other bacterial-mediated diseases of cattle, neutrophils play a critical role in the host innate immune response to infection. Neutrophils are among the earliest leukocytes recruited to the site of infection and contribute to host innate immune defenses through their ability to phagocytose and kill bacteria. The bactericidal activity of neutrophils is mediated, in part, through the generation of reactive oxygen species (ROS). Extracellular release of ROS can induce injury to host tissue as well, and aberrant release of ROS has been implicated in the pathogenesis of certain inflammatory-mediated diseases. Due to their essential role in bacterial clearance and implicated involvement in the pathogenesis of other diseases, there is much interest in the study of neutrophil-generated ROS. Several assays have been developed to measure ROS production, however, many of these have not been evaluated with bovine neutrophils. The objectives of the current study were to evaluate different assays capable of measuring bovine neutrophil ROS, and to compare the results of assays never previously tested with bovine neutrophils to those obtained from more well-established assays frequently used with these cells. Eight different assays were evaluated, including: luminol, isoluminol, and methyl cypridina luciferin analog (MCLA) chemiluminescence assays; Amplex Red, dihydroethidium (DHE), dichlorodihydrofluorescein diacetate (CM-H2DCFDA), and dihydrorhodamine 123 fluorescence assays; and the cytochrome c absorbance assay. The assays were evaluated in the context of their abilities to detect ROS produced in response to two agonists commonly used to induce neutrophil activation, phorbol 12-myristate, 13-acetate (PMA) and opsonized zymosan. Diphenyleneiodonium chloride, a NADPH oxidase inhibitor, was used to assess the specificity of the assays to detect ROS. The ability of these assays to discriminate between intra- and extracellular ROS and to specifically detect distinct ROS was evaluated using superoxide dismutase and catalase, which scavenge extracellular superoxide and hydrogen peroxide, respectively. With the exception of the DHE assay, all assays detected bovine neutrophil ROS generation elicited by PMA and zymosan. PMA, but not zymosan, was able to stimulate neutrophil generation of ROS at levels that were detectable with DHE. The MCLA chemiluminescence assay was the only assay that detected ROS produced in response to each of the lowest concentrations of PMA and zymosan tested. To our knowledge, this is the first study to evaluate DHE-, MCLA-, Amplex Red-, and isoluminol-based assays for the measurement of bovine neutrophil ROS, and the most comprehensive comparative study of ROS assays under similar experimental conditions." @default.
• W2004169530 created "2016-06-24" @default.
• W2004169530 creator A5051736891 @default.
• W2004169530 creator A5073709696 @default.
• W2004169530 creator A5076601669 @default.
• W2004169530 creator A5079570045 @default.
• W2004169530 date "2007-01-01" @default.
• W2004169530 modified "2023-10-14" @default.
• W2004169530 title "Evaluation of assays for the measurement of bovine neutrophil reactive oxygen species" @default.
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• W2004169530 doi "https://doi.org/10.1016/j.vetimm.2006.09.009" @default.
• W2004169530 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17067684" @default.
• W2004169530 hasPublicationYear "2007" @default.
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