Transcripts of sunflower antioxidant scavengers of the SOD and GPX families accumulate differentially in response to downy mildew infection, phytohormones, reactive oxygen species, nitric oxide, protein kinase and phosphatase inhibitors

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Immunolocalization of a plant glutathione peroxidase-like protein

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Two GPX-like proteins from Lycopersicon esculentum and Helianthus annuus are antioxidant enzymes with phospholipid hydroperoxide glutathione peroxidase and thioredoxin peroxidase activities

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Identification of sperm antigens as a first step towards the generation of a contraceptive vaccine to decrease fossorial water vole Arvicola terrestris Scherman proliferations

International audienc

Impact du stress oxidant sur la qualité nucléaire spermatique

International audienc

Glutathione peroxidases (GPX) at work on epididymal spermatozoa: An example of the dual effect of reactive oxygen species on mammalian male fertilizing ability.

The mammalian glutathione peroxidase gene family encodes bi-functional enzymes that can work either as classical reactive oxygen species (ROS) scavengers or as thiol-peroxidases, thereby introducing disulfide bridges in thiol-containing proteins. These dual effects are nowhere better demonstrated than in epididymal maturing spermatozoa where the concomitant actions of several glutathione peroxidases ensure the achievement of the structural maturation of sperm cells as well as their protection against ROS-induced damage. We review here the roles played by the sperm-associated forms of GPx4 (mitochondrial GPx4 and nuclear GPx4), the secreted GPx5 protein as well as the epithelial proteins GPx1, GPx3 and cellular GPx4, all functioning in the mammalian epididymis at different stages of the sperm's epididymal journey, and in different epididymis compartments

Spontaneously immortalized epithelial cells from mouse caput epididymidis

International audienceWe report here on the characterization of tissue-culture cell lines derived from primary cultures of the mouse caput epididymidis epithelium. The cell lines were spontaneously immortalized without the use of transforming oncogenes. In defined conditions, our epididymal cells adopted various morphological features that resembles that of the in vivo epididymis epithelium such as a polarized organization and the presence of junctional structures at their apical/lateral membranes as revealed by electron microscopy analyses. Flow cytometry analysis revealed that we were dealing with homogenous cell populations that had reached a near-tetraploid state. RT-PCR assays were used in order to show that several genes that can be considered as markers of in vivo caput epididymidis epithelium activity were expressed in our cell lines confirming that these cells were indeed in a differentiated state close to their endogenous state