Oxytocin regulates the expression of aquaporin 5 in the late-pregnant rat uterus

Ducza, Eszter and Seres B., Adrienn and Hajagos-Tóth, Judit and Falkay, György and Gáspár, Róbert (2014) Oxytocin regulates the expression of aquaporin 5 in the late-pregnant rat uterus. Molecular Reproduction and Development, 81 (6). pp. 524-530.


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Aquaporins (AQPs) are integral membrane channels responsible for the transport of water across a cell membrane. Based on reports that AQPs are present and accumulate in the female reproductive tract late in pregnancy, our aim was to study the expression of AQP isoforms (AQP1, 2, 3, 5, 8, and 9) at the end of pregnancy in rat in order to determine if they play a role in parturition. Reverse-transcriptase PCR revealed that specific Aqp mRNAs were detectable in the myometrium of nonpregnant and late-pregnancy (Days 18, 20, 21, and 22 of pregnancy) rat uteri. The expression of Aqp5 mRNA and protein were most pronounced on Days 18-21, and were dramatically decreased on Day 22 of pregnancy. In contrast, a significant increase was found in the level of Aqp5 transcript in whole-blood samples on the last day of pregnancy. The effect of oxytocin on myometrial Aqp5 expression in an organ bath was also investigated. The level of Aqp5 mRNA significantly decreased 5 min after oxytocin (10-8 M) administration, similarly to its profile on the day of delivery; this effect was sensitive to the oxytocin antagonist atosiban. The vasopressin analog desmopressin (3.7x10-8 M), on the other hand, did not alter the expression of Aqp5, but did increased the amount of Aqp2 mRNA, an effect that was atosiban-resistant. These results lead us to propose that oxytocin selectively influences the expression of Aqp5 at the end of pregnancy, and may participate in events that lead to parturition in the rat. The sudden increase of AQP5 in the blood on the last dayof pregnancymayserve as a marker that indicates the initiation of delivery.

Item Type: Article
Uncontrolled Keywords: pregnancy, myometrium, whole blood, aquaporin
Subjects: R Medicine / orvostudomány > RG Gynecology and obstetrics / nőgyógyászat, szülészet
R Medicine / orvostudomány > RS Pharmacy and materia medica / gyógyszerészet, gyógyászati eszközök
Depositing User: Dr Eszter Ducza
Date Deposited: 25 Sep 2014 10:24
Last Modified: 09 Apr 2015 23:15

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