Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

Cryopreservation and density-gradient washing (DGW) are routinely used in infertility treatment. This study used quantitative immunofluorescence analysis to report how these techniques affect concentrations of the oocyte activation factor, phospholipase C zeta (PLCζ) in spermatozoa from fertile men. DGW significantly elevated the proportion of spermatozoa in which PLCζ could be detected (by 25–81%; P < 0.0001). In contrast, in four donors, cryopreservation significantly reduced PLCζ concentrations (by 20–56%; P < 0.0001). These findings indicate that while DGW positively selects spermatozoa with detectable PLCζ, cryopreservation has significant detrimental effects upon PLCζ concentrations. Since reduced PLCζ concentrations have been implicated in deficient oocyte activation and infertility, further study is highly warranted.

Original publication




Journal article


Reprod Biomed Online

Publication Date





263 - 267


Cryopreservation, Gene Expression Regulation, Humans, Infertility, Male, Microscopy, Fluorescence, Reproductive Techniques, Assisted, Specimen Handling, Spermatozoa, Type C Phospholipases