Retinoid X receptor beta (RXRB) expression in Sertoli cells controls cholesterol homeostasis and spermiation. - Archive ouverte HAL Access content directly
Journal Articles Journal of Reproduction and Fertility Year : 2008

Retinoid X receptor beta (RXRB) expression in Sertoli cells controls cholesterol homeostasis and spermiation.

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Abstract

Somatic, targeted inactivation of the retinoid X receptor beta gene (Rxrb) in Sertoli cells (SC; yielding Rxrb(Ser-/-) mutants) leads to failure of spermatid release, accumulation of cholesterol esters and, subsequently, testis degeneration. These abnormalities are identical, in their nature and kinetics, to those observed upon inactivating Rxrb in the whole organism, thereby demonstrating that all reproductive functions of RXRB are carried out in SC. The Rxrb(Ser-/-) testis degeneration is a consequence of a cholesterol ester cell overload occurring in SC in response to reduced ABCA1- and SCARB1-mediated cholesterol efflux. The failure of spermiation was also reported in mice lacking the retinoic acid (RA) receptor-alpha (RARA) in SC (Rara(Ser-/-) mutants) and represents, in addition, a feature of vitamin A deficiency that can be readily induced in mice lacking the lecithin:retinol acyltransferase (Lrat(-/-) mutants). Altogether, these findings support the conclusion that RXRB heterodimerized with a RA-liganded RARA transduces signals required in SC for spermatid release.

Dates and versions

inserm-00350844 , version 1 (07-01-2009)

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Nadège Vernet, Christine Dennefeld, Muriel Klopfenstein, Alberto Ruiz, Dean Bok, et al.. Retinoid X receptor beta (RXRB) expression in Sertoli cells controls cholesterol homeostasis and spermiation.. Journal of Reproduction and Fertility, 2008, 136 (5), pp.619-26. ⟨10.1530/REP-08-0235⟩. ⟨inserm-00350844⟩
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