Effects of Inhibitors on Chicken Polymorphonuclear Leukocyte Oxygenation Activity Measured by Use of Selective Chemiluminigenic Substrates
Abstract:Chicken heterophil polymorphonuclear leukocytes (CPMNLs) have NADPH oxidase activity, but lack myeloperoxidase (MPO). Stimulation of CPMNLs by phorbol 12-myristate 13-acetate or chicken opsonified zymosan results in luminoldependent chemiluminescence (CL) activity, which is small relative to that of human peroxidase-positive neutrophils (HPMNLs), as well as lucigenin-dependent CL, comparable to HPMNL responses. Inhibitors were used to investigate and characterize the CL activity of CPMNLs. Inhibition constants were calculated, using Dixon inhibition analysis, or were reported as the concentration producing 50% inhibition of the magnitude of CL responses.
Azide and cyanide are effective inhibitors of luminol CL in HPMNLs, although these peroxidase inhibitors do not inhibit either luminol or lucigenin CL of CPMNLs. Since these agents also inhibit eosinophil peroxidase, lack of inhibition of CPMNL CL indicates that the small percentages of peroxidase-positive eosinophils in CPMNL preparations are not responsible for the luminol CL observed. Iodoacetate and fluoride, pre-oxidase and pre-peroxidase inhibitors of glycolytic metabolism, effectively inhibit lucigenin and luminol CL activities in CPMNLs. Superoxide dismutase competitively inhibits lucigenin and luminol CL in CPMNLs, but catalase is an ineffective inhibitor. Although luminol is efficiently dioxygenated by a MPO-dependent mechanism in HPMNL, use of peroxidase-deficient CPMNLs indicates that this substrate does not exclusively measure peroxidase activity.
Document Type: Research Article
Publication date: 2001-02-01
Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.
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