{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T11:48:47Z","timestamp":1791978527805,"version":"4.4.0"},"reference-count":72,"publisher":"Oxford University Press (OUP)","issue":"6","license":[{"start":{"date-parts":[[2024,6,18]],"date-time":"2024-06-18T00:00:00Z","timestamp":1718668800000},"content-version":"vor","delay-in-days":18,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"name":"NIH-NICHD","award":["R01 HD105701"],"award-info":[{"award-number":["R01 HD105701"]}]},{"name":"NIH-NICHD","award":["R01 HD068370"],"award-info":[{"award-number":["R01 HD068370"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,5,31]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Placental System L amino acid transporter activity is decreased in pregnancies complicated by intrauterine growth restriction (IUGR) and increased in fetal overgrowth. However, it is unknown if changes in the expression\/activity of placental Large Neutral Amino Acid Transporter Small Subunit 1 (Slc7a5\/LAT1) are mechanistically linked to placental function and fetal growth. We hypothesized that trophoblast-specific Slc7a5 overexpression increases placental transport of essential amino acids, activates the placental mechanistic target of rapamycin (mTOR) signaling, and promotes fetal growth in mice. Using lentiviral transduction of blastocysts with a Slc7a5 transgene, we achieved trophoblast-specific overexpression of Slc7a5 (Slc7a5 OX) with increased fetal (+27%) and placental weights (+10%). Trophoblast-specific Slc7a5 overexpression increased trophoblast plasma membrane (TPM) LAT1 protein abundance and TPM System L transporter (+53%) and System A transporter activity (+ 21%). Slc7a5 overexpression also increased transplacental transport of leucine (+ 85%) but not of the System A tracer, 14C-methylamino isobutyric acid, in vivo. Trophoblast-specific overexpression of Slc7a5 activated placental mTORC1, as assessed by increased (+44%) phosphorylation of S6 ribosomal protein (Ser 235\/236), and mTORC2 as indicated by phosphorylation of PKC\u03b1-Tyr-657 (+47%) and Akt-Ser 473 (+96%). This is the first demonstration that placental transport of essential amino acids is mechanistically linked to fetal growth. The decreased placental System L activity in human IUGR and the increased placental activity of this transporter in some cases of fetal overgrowth may directly contribute to the development of these pregnancy complications.<\/jats:p>","DOI":"10.1093\/pnasnexus\/pgae207","type":"journal-article","created":{"date-parts":[[2024,6,18]],"date-time":"2024-06-18T09:28:45Z","timestamp":1718702925000},"source":"Crossref","is-referenced-by-count":12,"title":["Trophoblast-specific overexpression of the LAT1 increases transplacental transport of essential amino acids and fetal growth in mice"],"prefix":"10.1093","volume":"3","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7282-7005","authenticated-orcid":false,"given":"Fredrick J","family":"Rosario","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology, University of Colorado, Anschutz Medical Campus , Aurora, CO 80045 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenneth","family":"Barentsen","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, University of Colorado, Anschutz Medical Campus , Aurora, CO 80045 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theresa L","family":"Powell","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, University of Colorado, Anschutz Medical Campus , Aurora, CO 80045 , USA"},{"name":"Section of Neonatology, Department of Pediatrics, University of Colorado Anschutz Medical Campus , Aurora, CO 80045 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8894-5716","authenticated-orcid":false,"given":"Johann","family":"Urschitz","sequence":"additional","affiliation":[{"name":"Institue of Biogenesis, University of Hawaii , Honolulu, HI 96822 , 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