Liver X Receptors (LXRs) Alpha and Beta Play Distinct Roles in the Mouse Epididymis1 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Biology of Reproduction Année : 2016

Liver X Receptors (LXRs) Alpha and Beta Play Distinct Roles in the Mouse Epididymis1

Marjorie Whitfield
  • Fonction : Auteur
Rémi Cadet
  • Fonction : Auteur
  • PersonId : 19635
  • IdHAL : remi-cadet
Christelle Damon-Soubeyrand
  • Fonction : Auteur
Rachel Guiton
Hanae Pons-Rejraji
Joël R Drevet
Fabrice Saez
Joël R. Drevet

Résumé

After its production in the testis, a spermatozoon has to undergo posttesticular maturation steps to become fully motile and fertile. The first step is epididymal maturation, during which immature spermatozoa are transformed into biochemically mature cells ready to proceed to the next step, capacitation, a physiological process occurring in the female genital tract. The biochemical transformations include modification of sperm lipid composition during epididymal transit, with significant changes in fatty acids, phospholipids, and sterols between the caput and the cauda epididymal spermatozoa. Although quantitative aspects of these changes are well documented for several mammalian species, molecular mechanisms governing these steps are poorly understood. Transgenic male mice invalidated for the two liver X receptors (LXRalpha and LXRbeta, nuclear oxysterol receptors regulating cholesterol and lipid metabolism) become sterile when aging, showing an epididymal phenotype. We used single-knockout-model mice to characterize the role of each LXR isoform during sperm maturation in the epididymis. We show here that although a certain redundancy exists in the functions of the two LXR isoforms, some physiological processes are more under the influence of only one of them. In both cases, aging males showed slight subfertility, associated with dyslipidemia, emphasizing the importance of lipid metabolism in relation with male fertility.

Dates et versions

hal-01657759 , version 1 (07-12-2017)

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Citer

Marjorie Whitfield, Aurélia Ouvrier, Rémi Cadet, Christelle Damon-Soubeyrand, Rachel Guiton, et al.. Liver X Receptors (LXRs) Alpha and Beta Play Distinct Roles in the Mouse Epididymis1. Biology of Reproduction, 2016, 94 (3), pp.55. ⟨10.1095/biolreprod.115.133538⟩. ⟨hal-01657759⟩
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