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Open AccessArticle

Positive Regulation of Decidualization by l-Type Amino Acid Transporter 1 (lat1) in Pregnant Mice

by Xiaojie Wang 1,†, Dongmei Tan 1,†, Jing Ma 1, Hao Liang 1, Qian Zhang 1, Yi Tan 1, Jiang Wang 2 and Wenping Luo 3,4,5,*
Laboratory Animal Center, Chongqing Medical University, Chongqing 400016, China
Chong Qing Obstetrics and Gynecology Hospital, Chongqing 400013, China
Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing 401147, China
Stomatological Hospital of Chongqing Medical University, Chongqing 401147, China
Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Nutrients 2016, 8(11), 704;
Received: 31 July 2016 / Revised: 26 October 2016 / Accepted: 31 October 2016 / Published: 5 November 2016
Amino acids have an important role in the pre and post implantation of placenta and embryo development. l-type amino-acid transporter 1 (lat1) is responsible for the transportation of large neutral amino acids and is mainly expressed in human fetal liver, placenta, brain, etc. This study is the first to investigate the expression of lat1 in the early pregnancy of mouse uteri and its role in the process of decidualization. Endometrial stromal cells of a mouse model were used to evaluate decidualization from Day 4–8 of pregnancy in vitro followed by lat1 knock down by small interfering RNA and by a competitive inhibitor of Leucine transport 2-aminobicyclo-(2,2,1)-heptane-2-carboxylic acid (BCH). The effects of lat1 on decidualization in vivo were assessed by injecting BCH into the uterine horns. The mRNA and protein expressions of lat1 in the implantation sites were higher than that in the inter-implantation sites and were localized in the luminal and gland epithelium, stromal and decidual cells. Its increased expression (p < 0.05) was associated with artificial decidualization as well as activation of prl expression. Down-regulation of lat1 expression in these cells by siRNA and BCH inhibited the decidual progression in vitro. Inhibition of lat1 transportation by BCH controlled decidual progression in vivo also accompanied the down-regulation of prl, lat1 expression in the decidual area and embryo size on Day 8 of pregnancy. In conclusion, these results revealed that lat1 might play an important role in the decidual progression both in vitro and in vivo. View Full-Text
Keywords: decidualization; l-amino acid transporter-1 (lat1); stromal cell; pregnant mice decidualization; l-amino acid transporter-1 (lat1); stromal cell; pregnant mice
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Wang, X.; Tan, D.; Ma, J.; Liang, H.; Zhang, Q.; Tan, Y.; Wang, J.; Luo, W. Positive Regulation of Decidualization by l-Type Amino Acid Transporter 1 (lat1) in Pregnant Mice. Nutrients 2016, 8, 704.

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