title: A chemiluminescent probe with a Cypridina luciferin analog, 2-methyl-6-phenyl-3,7-dihydroimidazo[1,2-a]pyrazin-3-one, specific and sensitive for O2- production in phagocytizing macrophages.
abstract: When a Cypridina luciferin analog (the title compound) was added to a macrophage suspension in Hank's balanced salt solution (control), the system emitted a weak, but detectable light, which was not altered in the presence of superoxide dismutase. The same system, however, emitted a much stronger light, just after the addition of a trigger, opsonized zymosan. The luminescence was suppressed to the control level in the presence of superoxide dismutase, while it was only slightly influenced, if at all, by NaN3, a scavenger of singlet oxygen and an inhibitor of myeloperoxidase. Some other results obtained also indicate the participation of O2- in the luciferin analog-dependent luminescence in macrophages during phagocytosis.
mesh_terms: D000818:Animals; D000838:Anions; D006801:Humans; D049449:Luminescence; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism*; D051379:Mice; D009895:Opsonin Proteins / Q000494:pharmacology; D010587:Phagocytosis; D011719:Pyrazines / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000494:pharmacology; D013481:Superoxides / Q000378:metabolism*; D015054:Zymosan / Q000494:pharmacology
chemical_list: D000838:Anions; D009895:Opsonin Proteins; D011719:Pyrazines; C048193:2-methyl-6-phenyl-3,7-dihydroimidazo(1,2-a)pyrazin-3-one; D013481:Superoxides; D015054:Zymosan; D013482:Superoxide Dismutase