{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T08:21:30Z","timestamp":1790238090513,"version":"4.1.0"},"reference-count":52,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2019,12,13]],"date-time":"2019-12-13T00:00:00Z","timestamp":1576195200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"name":"Ministry of Education, Science, and Culture of Japan","award":["#24590327"],"award-info":[{"award-number":["#24590327"]}]},{"name":"Ministry of Education, Science, and Culture of Japan","award":["#17H04323"],"award-info":[{"award-number":["#17H04323"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,4,15]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>The precise mechanisms of the reproductive physiological processes, such as labor initiation, are poorly understood. Oxytocin (OT) is one of the well-known uterotonics and is clinically adopted as a medication to facilitate childbirth. Vasopressin (VP), a posterior pituitary hormone similar to OT, has also been proposed to be involved in the reproductive physiology. In this study, we found that a total deficiency of V1a receptor subtype (V1aR) in mice resulted in a reduced number of pups, delayed labor initiation, and increased post-delivery hemorrhage compared with those in wild-type mice. Among the VP receptor subtypes, only V1aR was found to be expressed in the murine uterus, and its distribution pattern was different from that of the oxytocin receptor (OTR); V1aR expression was mainly distributed in the circular myometrium, whereas OTR was strongly expressed in both the circular and longitudinal myometrium. The maximum contractile force of the circular myometrium, induced by VP or OT, was attenuated in the pregnant uterus of Avpr1a-deficient mice. Contrarily, while OT expression was decreased in the Avpr1a-deficient uterus, OTR expression was significantly increased. These results suggest that V1aR deficiency not only reduces the uterine contractile force but also perturbs the expression of genes responsible for the reproductive physiology. Therefore, V1aR is necessary to exert the maximum contraction of the circular myometrium to deliver pups. This study revealed an important role of V1aR in physiological contraction and term parturition in mice.<\/jats:p>","DOI":"10.1093\/biolre\/ioz220","type":"journal-article","created":{"date-parts":[[2019,12,14]],"date-time":"2019-12-14T02:47:18Z","timestamp":1576291638000},"page":"923-934","source":"Crossref","is-referenced-by-count":8,"title":["Critical role of V1a vasopressin receptor in murine parturition\u2020"],"prefix":"10.1093","volume":"102","author":[{"given":"Hiroyoshi","family":"Tsuchiya","sequence":"first","affiliation":[{"name":"Division of Molecular Pharmacology, Department of Pharmacology, Jichi Medical University, Shimotsuke, Tochigi, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shyota","family":"Fujimura","sequence":"first","affiliation":[{"name":"Division of Molecular Pharmacology, Department of Pharmacology, Jichi Medical University, Shimotsuke, Tochigi, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoko","family":"Fujiwara","sequence":"first","affiliation":[{"name":"Division of Molecular Pharmacology, Department of Pharmacology, Jichi Medical University, Shimotsuke, Tochigi, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taka-aki","family":"Koshimizu","sequence":"first","affiliation":[{"name":"Division of Molecular Pharmacology, Department of Pharmacology, Jichi Medical University, Shimotsuke, Tochigi, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2019,12,13]]},"reference":[{"key":"2020040320551290100_ref1","volume-title":"Knobil and Neill's Physiology of Reproduction","author":"Knobil","year":"2006"},{"key":"2020040320551290100_ref2","doi-asserted-by":"crossref","first-page":"629","DOI":"10.1152\/physrev.2001.81.2.629","article-title":"The oxytocin receptor system: structure, function, and 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