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One aspect of mammalian post-testicular sperm maturation is the progressive change in their plasma membrane lipid composition. These modifications in lipids allow sperm cells to fuse with oocytes during fertilization. A significant share of these sperm lipid changes occurs during their descent through the epididymal tubule. It then continues within the female genital tract during the capacitation process, an essential prerequisite for acrosomic reaction and hence fertilization. This review presents what is known concerning the sperm plasma membrane lipid changes during epididymal maturation in various mamma- lian models. In the first section, after a brief presentation of the classic eukaryotic cell plasma membrane lipid organiza- tion, the emphasis is on the particularities of sperm plasma membrane lipids. The second section presents the different changes occurring in the three major classes of lipids (i.e. phospholipids, sterols and fatty acids) during the sperm's epididymal descent. The final section briefly describes the mechanisms by which these lipid changes might happen in the epididymal lumen environment. The role played by lipid-rich vesicles secreted by the epididymal epithelium via apocrine secretory processes is highlighted.

Évolution de la composante lipidique de la membrane plasmique des spermatozoïdes durant la maturation épididymaire