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

Biology of Reproduction
Marjorie WhitfieldF Saez

Abstract

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 ...Continue Reading

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Citations

Oct 4, 2017·Reproduction : the Official Journal of the Society for the Study of Fertility·M WhitfieldF Saez
Nov 2, 2019·International Journal of Molecular Sciences·Sheba JarvisCharlotte L Bevan
Apr 30, 2019·Andrology·R SullivanD Soulet
Jan 26, 2020·Drug Metabolism and Disposition : the Biological Fate of Chemicals·Eva HansmannRobert H Tukey

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