{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T22:08:31Z","timestamp":1787004511195,"version":"build-2736575974"},"reference-count":67,"publisher":"Portland Press Ltd.","issue":"21","license":[{"start":{"date-parts":[[2023,10,20]],"date-time":"2023-10-20T00:00:00Z","timestamp":1697760000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/"}],"funder":[{"DOI":"10.13039\/100009633","name":"HHS | NIH | Eunice Kennedy Shriver National Institute of Child Health and Human Development","doi-asserted-by":"publisher","award":["HD105701"],"award-info":[{"award-number":["HD105701"]}],"id":[{"id":"10.13039\/100009633","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100009633","name":"HHS | NIH | Eunice Kennedy Shriver National Institute of Child Health and Human Development","doi-asserted-by":"publisher","award":["HD068370"],"award-info":[{"award-number":["HD068370"]}],"id":[{"id":"10.13039\/100009633","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["portlandpress.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2023,11,15]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>The System L amino acid transporter, particularly the isoform Large Neutral Amino Acid Transporter Small Subunit 1 (LAT1) encoded by SLC7A5, is believed to mediate the transfer of essential amino acids in the human placenta. Placental System L amino acid transporter expression and activity is decreased in pregnancies complicated by IUGR and increased in fetal overgrowth. However, it remains unknown if changes in the expression of LAT1 are mechanistically linked to System L amino acid transport activity. Here, we combined overexpression approaches with protein analysis and functional studies in cultured primary human trophoblast (PHT) cells to test the hypothesis that SLC7A5 overexpression increases the uptake of essential amino acids and activates mTOR signaling in PHT cells. Overexpression of SLC7A5 resulted in a marked increase in protein expression of LAT1 in the PHT cells microvillous plasma membrane and System L amino acid transporter activity. Moreover, mTOR signaling was activated, and System A amino acid transporter activity increased following SLC7A5 overexpression, suggesting coordination of trophoblast amino transporter expression and activity to ensure balanced nutrient flux to the fetus. This is the first report showing that overexpression of LAT1 is sufficient to increase the uptake of essential amino acids in PHT cells, which activates mTOR, a master regulator of placental function. The decreased placental System L activity in human IUGR and the increased placental activity of this transporter system in some cases of fetal overgrowth may directly contribute to changes in fetal amino acid availability and altered fetal growth in these pregnancy complications.<\/jats:p>","DOI":"10.1042\/cs20230490","type":"journal-article","created":{"date-parts":[[2023,10,20]],"date-time":"2023-10-20T06:44:32Z","timestamp":1697784272000},"page":"1651-1664","update-policy":"https:\/\/doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Overexpression of the LAT1 in primary human trophoblast cells increases the uptake of essential amino acids and activates mTOR signaling"],"prefix":"10.1042","volume":"137","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7282-7005","authenticated-orcid":false,"given":"Fredrick\u00a0J.","family":"Rosario","sequence":"first","affiliation":[{"name":"1Department of Obstetrics and Gynecology, University of Colorado, Anschutz Medical Campus, Aurora, CO, U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johann","family":"Urschitz","sequence":"additional","affiliation":[{"name":"2Institute for Biogenesis Research, University of Hawaii, Honolulu, HI, U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theresa\u00a0L.","family":"Powell","sequence":"additional","affiliation":[{"name":"1Department of Obstetrics and Gynecology, University of Colorado, Anschutz Medical Campus, Aurora, CO, U.S.A."},{"name":"2Institute for Biogenesis Research, University of Hawaii, Honolulu, HI, U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas\u00a0L.","family":"Brown","sequence":"additional","affiliation":[{"name":"3Section of Neonatology, Department of Pediatrics, University of Colorado Anschutz Medical Campus, Aurora, CO, U.S.A."},{"name":"4Department of Neuroscience, Cell Biology, and Physiology, Wright State University Boonshoft School of Medicine, Dayton, OH, U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Jansson","sequence":"additional","affiliation":[{"name":"1Department of Obstetrics and Gynecology, University of Colorado, Anschutz Medical Campus, Aurora, CO, U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"288","published-online":{"date-parts":[[2023,11,10]]},"reference":[{"key":"2023111011150881000_B1","doi-asserted-by":"publisher","first-page":"61","DOI":"10.1056\/NEJMra0708473","article-title":"Effect of in utero and early-life conditions on adult health and disease","volume":"359","author":"Gluckman","year":"2008","journal-title":"N. 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