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Modulatory effects of steroid hormones, oxytocin, arachidonic acid, forskolin and cyclic AMP on the expression of aquaporin 1 and aquaporin 5 in the porcine uterus during placentation.

J. Physiol. Pharmacol.2016 Apr;67(2):311-9
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摘要


Aquaporins (AQPs) are proteins forming trans-membrane channels responsible for water transport. AQP1 and AQP5 are present in structures of the female reproductive system. In the uterus, these AQPs are involved in water movement between the intraluminal, interstitial and capillary compartments and their uterine expression is essential throughout the pregnancy, including its early stages. Thus, the study aimed to assess the influence of P4 (progesterone), E2 (estradiol), OT (oxytocin), AA (arachidonic acid), cAMP and FSK (forskolin) on the AQP1 and AQP5 mRNA and protein expression in the uterine tissue of gilts on Days 30 - 32 of gestation (the placentation period), following short (3 h) and long (24 h) incubations. Steroid hormones influenced the expression of AQP1 and AQP5; E2 up-regulated, but P4 down-regulated mRNAs of these AQPs, whereas the protein level of studied AQPs was increased by both steroids. OT treatment decreased AQP1 (after 24 h), but increased AQP5 (after 3 h) mRNA expression. Treatment with AA significantly reduced the AQP1 expression at the mRNA level, but stimulated at the protein level. The expression of AQP5 mRNA and protein was stimulated by AA. FSK markedly decreased AQP1 mRNA, but increased of AQP5 after 3-h incubation. In turn, cAMP stimulated and inhibited transcription of AQP5 after 3- and 24-h incubations, respectively. Immunohistochemical analysis confirmed the uterine localization of AQP1 in the apical and basal membranes of endothelial cells and AQP5 in the apical membranes of epithelial cells under control condition. Treatments with P4, E2, AA, cAMP or FSK have caused additional appearance of AQP5 labeling in the basolateral membranes of epithelial cells. These results suggest a participation of steroid hormones (P4 and E2), AA derivatives and cAMP in controlling the expression of AQP1 and AQP5 as well as the distribution of AQP5 in the uterine tissue of pregnant gilts during placentation (Days 30 - 32 of gestation).

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