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Pro-inflammatory cytokine-induced microRNA-212-3p expression promotes myocyte contraction via methyl-CpG-binding protein 2: a novel mechanism for infection-related preterm parturition.
Molecular Human Reproduction 2019 March 21
Preterm labour is a common pregnancy complication contributing to major maternal and fetal morbidity and mortality. We have found microRNA (miR)-212-3p, a potential infection-associated molecule, was significantly over-expressed during human preterm labour. However, the mechanism remains unknown. In this study, we have adopted a lipopolysaccharide (LPS)-induced Institute of Cancer Research murine preterm model to examine the role of miR-212-3p in the infection-induced preterm labour. Myometrial miR-212-3p expression was increased by nearly 4-fold in the term labour group (P = 0.10) and 12-fold (P = 0.03) in the LPS-induced preterm labour group compared with the non-labour group. In vitro cellular experiments confirmed that a series of pro-inflammatory cytokines, including interleukin (IL)1B (P = 0.02) and IL-6 (P = 0.01), rather than LPS (P = 0.08) itself could significantly upregulate miR-212-3p expression in human myometrial smooth muscle cells. Methyl-CpG-binding protein 2 (MeCP2), as a target gene of miR-212-3p confirmed by our dual luciferase assay, influenced myocyte contractility and connexin 43 expression which is an important contraction-associated protein. Therefore, we conclude that miR-212-3p may be involved in infection-induced preterm labour through MeCP2 and it is a promoting molecule and novel target for the diagnosis and treatment of preterm labour in the future.
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