Redox cycling induces spermptosis and necrosis in stallion spermatozoa while the hydroxyl radical (OH•) only induces spermptosis.

Abstract

Oxidative stress is a major factor explaining sperm dysfunction of spermatozoa surviving freezing and thawing and is also considered a major inducer of a special form of apoptosis, visible after thawing, in cryopreserved spermatozoa. To obtain further insights into the link between oxidative stress and the induction of apoptotic changes, stallion spermatozoa were induced to oxidative stress through redox cycling after exposure to 2-methyl-1,4-naphthoquinone (menadione), or hydroxyl radical formation after FeSO4 exposure. Either exposure induced significant increases (p < 0.05) in two markers of lipid peroxidation: 8-iso-PGF2α and 4-hydroxynonenal (4-HNE). While both treatments induced changes indicative of spermptosis (caspase-3 activation and decreased mitochondrial membrane potential) (p < 0.01), menadione induced sperm necrosis and a dramatic reduction in motility and thiol content in stallion spermatozoa. Thus, we provided evidence that oxidative stress underlies spermptosis, and thiol content is a key factor for stallion sperm function.

DOI: 10.1111/rda.13052

Cite this paper

@article{Muoz2017RedoxCI, title={Redox cycling induces spermptosis and necrosis in stallion spermatozoa while the hydroxyl radical (OH•) only induces spermptosis.}, author={Patricia Mart{\'i}n Mu{\~n}oz and L Anel-L{\'o}pez and Jose M Ortiz-Rodriguez and Mercedes {\'A}lvarez and P L P{\'e}rez de Paz and Carolina M. Balao da Silva and Heriberto Rodriguez Martinez and Maria Cruz Gil and Luis Anel and F J Pe{\~n}a and Cristina Ortega Ferrusola}, journal={Reproduction in domestic animals = Zuchthygiene}, year={2017} }