Defining the mechanisms by which the reactive oxygen species by-product, 4-hydroxynonenal, affects human sperm cell function

Mark A Baker, Anita S Weinberg, Louise Hetherington, Ana-Izabel Villaverde, Tony Velkov, Jonathan Bayldon Baell, Christopher P Gordon

Research output: Contribution to journalArticleResearchpeer-review

45 Citations (Scopus)

Abstract

Lipid peroxidation products such as the naturally occurring aldehyde 4-hydroxynonenal (4-HNE) are known to be cytotoxic toward different cell types, including spermatozoa. In order to understand this at the molecular level, we have employed a proteomic approach to characterize direct 4-HNE adducts on human spermatozoa. Several proteins were identified to be of particular interest, including aldehyde labeling of histone methyltransferase and dynein heavy chain. In addition, we found that 4-HNE bound to part of the activation segment, cysteine residue 199, of protein kinase A (PKA). Interestingly, at low levels, addition of 4-HNE had a stimulatory effect on PKA. However, this did not correlate to increased phosphotyrosine levels during capacitation. This data explains the link between reactive oxygen species and sperm toxicity. Given that epigenetic regulation is likely affected in oxidative-stressed spermatozoa, this data show that spermatozoa appear to shut down under these conditions before reaching the egg.
Original languageEnglish
Pages (from-to)1 - 10
Number of pages10
JournalBiology of Reproduction
Volume92
Issue number4
DOIs
Publication statusPublished - 2015

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