Reactive oxygen species in human semen in relation to leukocyte contamination.
OBJECTIVE
Excessive production of reactive oxygen species (ROS) in semen has been linked to male infertility. Main sources of ROS in male genital tract are immature and/or damaged spermatozoa and a subpopulation of leukocytes known as polymorphonuclear neutrophils (PMN).


METHODS
Study group included male partners of infertile couples, 67 normospermic males (group B) and 98 males with sperm abnormalities in one or more parameters (group C), 36 fertile volunteers (group A) served as controls. Sperm parameters were determined according to WHO guidelines. The ROS production was measured by chemiluminiscence in sperm suspension in phosphate buffered saline.


RESULTS
All fertile volunteers in the control group had seminal PMN concentrations below 0.5x10(6)/ml. Therefore study subjects, 67 normospermic and 98 men with sperm abnormalities, were further subdivided into two subgroups of PMN concentrations: (1) < 0.5x10(6)/ml and (2) 0.5 to 1.0x10(6)/ml. The ROS production in individuals varied greatly from 1.0x10(2) to 1.7 x10(7) RLU/min per 20x10(6) spermatozoa. The ROS production in both subgroups of normospermic men and the subgroup (1) of men with sperm abnormalities was not different from the ROS production in fertile controls. The ROS production in the subgroup (2) with sperm abnormalities was significantly higher than in controls (P = 0.00004).


CONCLUSIONS
Our findings suggest that the contribution of PMN to the ROS production in semen is negligible only up to a concentration of 0.5x10(6)/ml. This suggests that the current WHO Guidelines threshold of 1.0x10(6) PMN per ml of semen is too high and might be re-evaluated.
Oborna
Ivana
I
Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic. obornai@fnol.cz
Fingerova
Helena
H
Novotny
Jiri
J
Brezinova
Jana
J
Svobodova
Magda
M
Aziz
Nabil
N
D006801:Humans; D007248:Infertility, Male / Q000503:physiopathology*; D008297:Male; D009504:Neutrophils / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000032:analysis; D012661:Semen / Q000737:chemistry* / Q000166:cytology*
D017382:Reactive Oxygen Species