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首页> 外文期刊>Australian and New Zealand Journal of Obstetrics and Gynecology >The emerging roles of placenta-specific microRNAs in regulating trophoblast proliferation during the first trimester
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The emerging roles of placenta-specific microRNAs in regulating trophoblast proliferation during the first trimester

机译:胎盘早孕中胎盘特异性microRNA在调节滋养细胞增殖中的新兴作用

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摘要

In the human placenta, eight 'placenta-specific' microRNAs (miRNAs) are exclusively expressed and are associated with high cloning frequencies. The expression of placenta-specific miRNAs is known to be involved in preeclampsia, but the understanding of these miRNAs is still limited. The goal of this study was to investigate the levels and localisations of eight placenta-specific miRNAs in placental villi with different proliferative abilities during the first trimester. Immunohistochemical analyses indicated that placental trophoblast proliferation ability was associated with the weight of villi in the same gestational week during the first trimester. Of the eight placenta-specific miRNAs, quantitative real-time RT-PCR demonstrated that the expression of miR-517b and miR-1283 was increased in the lightest villi and decreased in the heaviest one, the expression of miR-519a was increased in the heaviest villi and decreased in the lightest one. In situ hybridisation analysis showed that miR-517b and miR-519a were located primarily in the trophoblast layer, while miR-1283 were expressed not only in the villous trophoblasts but also in some villous stroma cells. These findings suggest that miR-517b and miR-519a may play an important role in trophoblast proliferation during the first trimester.
机译:在人类胎盘中,仅表达​​了八种“胎盘特异性” microRNA(miRNA),并与高克隆频率相关。已知胎盘特异性miRNA的表达与先兆子痫有关,但对这些miRNA的理解仍然有限。这项研究的目的是调查在头三个月中具有不同增殖能力的胎盘绒毛中的八个胎盘特异性miRNA的水平和定位。免疫组织化学分析表明,在孕早期的同一孕周,胎盘滋养层细胞的增殖能力与绒毛的重量有关。在8种胎盘特异性miRNA中,实时定量荧光定量RT-PCR表明,最轻的绒毛中miR-517b和miR-1283的表达增加,最轻的绒毛中miR-517b的表达增加。绒毛最重,最轻的绒毛减少。原位杂交分析表明,miR-517b和miR-519a主要位于滋养层,而miR-1283不仅在绒毛滋养层中表达,还在某些绒毛基质细胞中表达。这些发现表明,miR-517b和miR-519a可能在孕早期的滋养细胞增殖中起重要作用。

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