Interaction between reactive oxygen species and gallocyanine under neutrophil activation

Reactive oxygen species (ROS) have a crucial role in human physiological and pathophysiological processes. Prolonged exposure to high ROS concentrations may lead to cardiovascular, neurodegenerative, etc. diseases. In this study, gallocyanine has been proposed to register the ROS production. The gallocyanine spectral properties changes under ROS (•О2ˉ, H2O2) and reactive halogen (HOCl) species are analyzed. It is shown that the dye is oxidized in solution, both under the action of ROS and reactive halogen species. Based on the data obtained, it is possible to suggest that superoxide anion radicals make a major contribution to chemical conversion of the dye in suspensions of activated neutrophils. It is that gallocyanine can be used to assess the functional activity of neutrophils, namely, the NADPH-oxidase, as well as to design and test novel therapeutic agents for diseases associated with developing oxidative stress.