{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T22:18:50Z","timestamp":1790720330332,"version":"4.1.0"},"reference-count":70,"publisher":"Public Library of Science (PLoS)","issue":"4","license":[{"start":{"date-parts":[[2023,4,6]],"date-time":"2023-04-06T00:00:00Z","timestamp":1680739200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000024","name":"Canadian Institutes of Health Research","doi-asserted-by":"publisher","award":["FS154313"],"award-info":[{"award-number":["FS154313"]}],"id":[{"id":"10.13039\/501100000024","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010090","name":"Women and Children's Health Research Institute","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010090","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010090","name":"Women and Children's Health Research Institute","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010090","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100019691","name":"Faculty of Medicine and Dentistry, University of Alberta","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100019691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010322","name":"Stollery Children\u2019s Hospital Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010322","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>Advanced maternal age (\u226535 years) is associated with an increased risk of pregnancy complications such as fetal growth restriction and preeclampsia. We previously demonstrated poor pregnancy outcomes (reduced fetal body weight), altered vascular function, and increased expression of endoplasmic reticulum (ER) stress markers (phospho-eIF2\u03b1 and CHOP) in mesenteric arteries from a rat model of advanced maternal age. Further, treatment of aged dams during pregnancy with an ER stress inhibitor, tauroursodeoxycholic acid (TUDCA) increased fetal body weight (both male and female), tended to improve uterine artery function, and reduced expression of phospho-eIF2\u03b1 and CHOP in systemic arteries. Placental ER stress has been linked to poor pregnancy outcomes in complicated pregnancies but whether placental ER stress is evident in advanced maternal age is not known. In addition, sex-specific changes in the placental labyrinth and junctional zones from male and female offspring in advanced maternal age have not been investigated. Therefore, the current study aimed to investigate the effect of TUDCA intervention on placental ER stress. We hypothesize that placental ER stress is increased in a rat model of advanced maternal age that is alleviated by TUDCA intervention for both sexes. Placental ER stress markers (GRP78, phospho-eIF2\u03b1, ATF-4, CHOP, ATF-6\u03b1, and sXBP-1) were quantified by Western blot in placentas from male and female offspring; the labyrinth and junction zones were analyzed separately. In the placental labyrinth zone from male offspring, only GRP78 (p = 0.007) was increased in aged dams compared to young dams; TUDCA treatment reduced the placental expression of GRP78 in aged dams (p = 0.003). In addition, TUDCA reduced the levels of phospho-eIF2\u03b1 (p = 0.021), ATF-4 (p = 0.016), and CHOP (p = 0.012) in aged dams but no effect was observed in young TUDCA-treated dams. In the placental labyrinth zone from female offspring, an increased level of phospho-eIF2\u03b1 (p = 0.005) was observed in aged dams compared to young dams, and TUDCA treatment had no effect in both young and aged groups. In the placental junctional zone from male and female offspring, no changes in the expression of GRP78, phospho-eIF2\u03b1, ATF-4, CHOP, and ATF-6\u03b1 was observed with or without TUDCA treatment in both young and aged groups, however, a reduced expression of sXBP-1 protein was observed in from both male (p = 0.001) and female (p = 0.031) placentas from aged-TUDCA treated dams compared to aged control. In conclusion, our data highlight the complexity and sex-specificity of ER stress responses in advanced maternal age with TUDCA treatment maintaining ER stress proteins to basal levels and improving fetal growth in both male and female offspring.<\/jats:p>","DOI":"10.1371\/journal.pone.0282442","type":"journal-article","created":{"date-parts":[[2023,4,6]],"date-time":"2023-04-06T17:42:46Z","timestamp":1680802966000},"page":"e0282442","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":16,"title":["The effect of tauroursodeoxycholic Acid (TUDCA) treatment on placental endoplasmic reticulum (ER) stress in a rat model of advanced maternal 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