title: Laser and serum opsonic activity.
abstract: The purpose of this study was to investigate the effects of low level laser (LLL: GaA1As diode laser; 830 nm) on serum opsonic activity, which was assessed by neutrophil-associated chemiluminescence (CL) response to zymosan opsonized with sera irradiated in vitro with various doses of LLL. We used both lucigenin-dependent CL (LgCL) for superoxide (O2-) detection and luminol-dependent CL (LmCL) which detects myeloperoxidase (MPO)-dependent formation of hypochlorous acid in combination with MPO inhibitor, sodium azide (NaN3). When serum opsonic activity was assessed by LgCl, NaN3, markedly enhanced the responses, suggesting that O2- is accumulated due to the MPO blockade, leading to the excitation of LgCl. However, LLL-irradiation had no effects on serum opsonic activity. On the other hand, when serum opsonic activity was assessed by LmCl, NaN3, strongly inhibited the response. The effects of LLL at different output powers were characterized by similar values, but significantly higher values were observed at the highest dose tested (60 mW for 1 min) in the absence of NaN3. Since this enhancement effect disappeared with NaN3, it was suggested that high dose LLL-irradiation probably activated the opsonic activity by facilitating neutrophils to degranulate MPO. However, lower doses used for therapeutic purposes had no effects at any output powers tested.
authors.affiliation: Cantacuzino Institute, Department of Experimental Pathology, Bucharest, Romania.
authors.forename: V F
authors.initials: VF
authors.lastname: Dima
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: Q
authors.initials: Q
authors.lastname: Liu
authors.forename: T
authors.initials: T
authors.lastname: Koie
authors.forename: M
authors.initials: M
authors.lastname: Yamada
authors.forename: K J
authors.initials: KJ
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Nakaji
authors.forename: K
authors.initials: K
authors.lastname: Sugawara
mesh_terms: D006801:Humans; D007834:Lasers; D008163:Luminescent Measurements; D009504:Neutrophils / Q000276:immunology*; D010587:Phagocytosis / Q000528:radiation effects*