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The effect of interleukin-1β, interleukin-6, and tumor necrosis factor-α on estradiol-17β release in the myometrium: the in vitro study on the pig model.

Theriogenology. 2014 Jan 15;81(2):266-74. Epub 2013 Oct 18
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摘要


Estradiol-17β (E2) is a potent regulator of early pregnancy and the estrous cycle in pigs. Production of E2 occurs in the porcine myometrium, but the factors involved in its regulation are unknown. In this in vitro study, it was investigated whether interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α affect the release of E2 from the porcine myometrium on Days 10 to 11, 12 to 13, and 15 to 16 of pregnancy and the estrous cycle. The expression of the cytochrome P450 family 19 (CYP19) gene and the presence of the aromatase cytochrome P450 protein in the myometrium confirmed the ability of the tissue to produce E2. In gravid pigs, the expression of IL1RI mRNA and IL6R mRNA was markedly increased on Days 15 to 16 of gestation, whereas TNFRI mRNA was increased on Days 10 to 11 of gestation. In cyclic pigs, the expression of myometrial IL1RI mRNA did not differ among the studied days, although the expression of IL6R and TNFRI mRNAs was increased on Days 15 to 16. In gravid pigs, IL-1β, IL-6, and TNF-α increased myometrial E2 secretion on Days 15 to 16 but did not affect E2 release on Days 10 to 11 and 12 to 13 of pregnancy. In cyclic pigs, IL-1β, IL-6, and TNF-α did not increase myometrial E2 release. In conclusion, IL-1β, IL-6, and TNF-α affected myometrial E2 release in a manner that is dependent on the physiologic status of the female. The porcine myometrium expresses IL1RI, IL6R, and TNFRI genes and is the target tissue for IL-1β, IL-6, and TNF-α. In gravid pigs, IL-1β, IL-6, and TNF-α may increase myometrial release of E2 in vitro specifically on Days 15 to 16 of pregnancy. These findings may be of interest to researchers using pigs as an animal model for fetal programming.

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