Differential gene expression of Eph-ephrin A1 and LEPR-LEP with high or low number of embryos in pigs during implantation

文献类型: 外文期刊

第一作者: Fu, Y.

作者: Fu, Y.;Ren, S.;Fu, Y.;Knox, R. V.;Li, L.

作者机构:

关键词: embryo survival; Eph-ephrin A1; expression; implantation; LEPR-LEP

期刊名称:REPRODUCTION IN DOMESTIC ANIMALS ( 影响因子:2.005; 五年影响因子:2.154 )

ISSN: 0936-6768

年卷期: 2018 年 53 卷 4 期

页码:

收录情况: SCI

摘要: Contents The objective of this study was to ascertain whether mRNA and protein expressions of implantation-related genes (erythropoietin-producing hepatocellular receptor-ligand A1, Eph-ephrin A1 and leptin receptor-leptin, LEPR-LEP) differed between pigs with high and low number of embryos, and whether these differences in gene expression might affect embryo implantation. Experimental pig groups (n=24) for high and low number of embryos were prepared by altering the number of eggs ovulated in pre-pubertal gilts treated with 1.5x(High) or 1.0x(Low) PG600 ([400IUPMSG+200IUhCG]/dose, AKZO-NOBEL). Gilts expressing oestrus were artificially inseminated twice and maintained in breeding and gestation until the reproductive tract was collected on day 22 of pregnancy. At slaughter, the reproductive tracts from each pregnant gilt from each treatment were immediately processed to collect samples for RNA and protein analysis. Within each gilt, three conceptus points were sampled, one from each horn and then a random conceptus within the tract. At each conceptus point, endometrial attachment site, chorion-allantois and embryo were collected and immediately frozen in liquid nitrogen. Number of corpus luteum (CL) (35.4 vs. 12.6) and total embryo number (18.8 vs. 10.2) were greater in the high-embryo compared to the low-embryo group, respectively (p<.05). Real-time qPCR results showed that Eph-ephrin A1 mRNA expression was less in the high-embryo (p<.05) compared to the low-embryo group. In addition, Western blotting analysis indicated that Eph-ephrin A1 and LEP protein expression at endometrial attachment site in high-embryo was less (p<.05) compared to low-embryo group. It was also noted that mRNA expression of Eph-ephrin A1 and LEPR-LEP was greater in pregnant than non-pregnant gilts (p<.05). Moreover, mRNA expression of Eph-ephrin A1 (p<.05) and LEPR-LEP was greatest at endometrial attachment site among all three tissues. There was a positive correlation between expressions of Eph-ephrin A1, LEPR-LEP and embryo length with the correlation coefficient 0.31-0.59. For Eph-ephrin A1, the highest correlation coefficient appeared between Eph A1 expression and normal embryo number, between ephrin A1 expression and embryo length. For LEPR-LEP, the highest correlation coefficient appeared between LEPR-LEP expression and ovary weight (0.79 for both, p<.05), followed by embryo length and weight. The results of this study suggest that low expression of Eph-ephrin A1 and LEPR-LEP is somehow related to increased embryo number during implantation and that endometrial attachment site might be the main target tissue of these gene products. Yet, the increased expression of Eph-ephrin A1 and LEPR-LEP appeared associated with increased embryo growth (length and weight) and ovary weight, Eph-ephrin A1 and LEPR-LEP might play roles in the regulation of embryo implantation in pigs.

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