Level of NO/nitrite and 3-nitrotyrosine in seminal plasma of infertile men: Correlation with sperm number, motility and morphology.

Nitric oxide (NO) is a signaling molecule responsible for initiation of molecular events that influence sperm functionality in a concentration-dependent manner. It is still not fully understood how seminal plasma NO contributes to sperm pathologies. The aim of this study was to elucidate whether and how NO is implicated in etiology of different sperm abnormalities.