title: Diurnal variation in neutrophil function.
abstract: Neutrophil functions, including chemotaxis, reactive oxygen species (ROS)-producing capacity of neutrophils, and serum opsonic activity were investigated in 9 young healthy male volunteers. Venous blood of these volunteers was obtained under standardized conditions at 4-h intervals over a 24-h span. Neutrophil chemotaxis was evaluated by a modified Boyden technique, ROS-producing capacity of neutrophils and serum opsonic activity were measured by a simultaneous multiple measurement system based on luminol-dependent chemiluminescence and indicated by peak height and peak time. ROS-producing capacity of neutrophils and serum opsonic activity were activated in the daytime, and decreased from night to morning. There were negative correlations between the peak time of the luminol-dependent chemiluminescent response, neutrophil number (p<0.01) and segmented neutrophil number (p>0.01). On the other hand, no significant correlations were noted between serum opsonic activity and IgG, IgA, IgM, C3 or C4. In contrast, the peaks of neutrophil chemotaxis were at the wake-up time (6:00a.m.) and in the evening (6:00p.m.). This study indicates that diurnal variation of neutrophil function exists.
authors: Department of Hygiene, Hirosaki University School of Medicine, 5 Zaifu-cho, 036, Hirosaki, Japan.
authors: M
authors: M
authors: Shiraishi
authors: K
authors: K
authors: Suzuki
authors: T
authors: T
authors: Abe
authors: T
authors: T
authors: Kikuchi
authors: H
authors: H
authors: Satoh
authors: S
authors: S
authors: Nakaji
authors: K
authors: K
authors: Sugawara