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Int. J. Mol. Sci. 2016, 17(1), 96;

Overexpression of PRL7D1 in Leydig Cells Causes Male Reproductive Dysfunction in Mice

Institute of Life Sciences, Chongqing Medical University, Chongqing 400016, China
The First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: William Chi-shing Cho
Received: 9 October 2015 / Revised: 3 January 2016 / Accepted: 6 January 2016 / Published: 13 January 2016
(This article belongs to the Section Biochemistry)
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Prolactin family 7, subfamily d, member 1 (PRL7D1) is found in mouse placenta. Our recent work showed that PRL7D1 is also present in mouse testis Leydig cells, and the expression of PRL7D1 in the testis exhibits an age-related increase. In the present study, we generated transgenic mice with Leydig cell-specific PRL7D1 overexpression to explore its function during male reproduction. Prl7d1 male mice exhibited subfertility as reflected by reduced sperm counts and litter sizes. The testes from Prl7d1 transgenic mice appeared histologically normal, but the frequency of apoptotic germ cells was increased. Prl7d1 transgenic mice also had lower testosterone concentrations than wild-type mice. Mechanistic studies revealed that Prl7d1 transgenic mice have defects in the testicular expression of steroidogenic acute regulatory protein (STAR) and hydroxy-delta-5-steroid dehydrogenase, 3 beta- and steroid delta-isomerase cluster (HSD3B). Further studies revealed that PRL7D1 overexpression affected the expression of transferrin (TF) in Sertoli cells. These results suggest that PRL7D1 overexpression could lead to increased germ cell apoptosis and exert an inhibitory effect on testosterone production in Leydig cells by reducing the expression of certain steroidogenic-related genes. In addition, PRL7D1 appears to have important roles in the function of Sertoli cells, which, in turn, affects male fertility. We conclude that the expression level of PRL7D1 is associated with the reproductive function of male mice. View Full-Text
Keywords: Plr7d1; male reproductive dysfunction; Leydig cells Plr7d1; male reproductive dysfunction; Leydig cells

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Liu, Y.; Su, X.; Hao, J.; Chen, M.; Liu, W.; Liao, X.; Li, G. Overexpression of PRL7D1 in Leydig Cells Causes Male Reproductive Dysfunction in Mice. Int. J. Mol. Sci. 2016, 17, 96.

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