Upregulation of METTL14 contributes to trophoblast dysfunction by elevating FOXO3a expression in an m6A-dependent manner. (24th June 2022)

• Record Type: Journal Article
• Authors: Fan, Wenqiang; Zhou, Wenbo; Yan, Qiang; Peng, Yue; Wang, Huiyan; Kong, Chengcai; Zhang, Bin; Yu, Bin; Chen, Li; Xue, Pingping
• Is Part Of: Placenta. Volume 124(2022)
• Page Start: 18
• Page End: 27
• Publication Date: 2022-06-24
• Subjects: Preeclampsia -- METTL14 -- m6A methylation -- FOXO3a -- Trophoblast cells; Placenta -- Periodicals; Reproduction -- Periodicals; Placenta -- Periodicals; Placenta -- Périodiques; Reproduction -- Périodiques; 612.63
• DOI: 10.1016/j.placenta.2022.05.008
• Languages: English
• ISSNs: 0143-4004

Abstract

Abstract: Introduction: Preeclampsia, a specific complication of pregnancy, is a leading cause of perinatal and maternal mortality worldwide. N 6 -methyladenosine (m 6 A) is a prevalent and reversible modification of mammalian mRNAs, and is known to play an important role in various physiological and pathological processes. However, little is known about its possible effects on trophoblasts in preeclampsia. Methods: Colorimetric RNA m 6 A methylation quantification assay and dot blotting were used to assess the levels of global RNA m 6 A modification in placental tissues collected from females with normal pregnancy and preeclampsia, while the mRNA levels of major m 6 A methyltransferases/demethylases were investigated by quantitative real-time polymerase chain reaction. The effects of methyltransferase-like 14 (METTL14) on trophoblasts were evaluated using cell counting kit-8, transwell invasion assay, autophagic flux assay, and Annexin V/propidium iodide apoptosis assay. The molecular mechanism underlying the regulation of forkhead box O3a (FOXO3a) expression by METTL14 was determined using methylated RNA immunoprecipitation and transcription inhibition assays. Results: Global RNA m 6 A methylation and METTL14 expression were significantly increased in placental tissues obtained from patients with preeclampsia. In vitro studies showed that overexpression of METTL14 in HTR-8/SVneo cells inhibited trophoblast proliferation and invasion, but induced trophoblast autophagy and apoptosis. We further demonstrated that METTL14 epigenetically elevated FOXO3a expression via an m 6 A-dependent mechanism. FOXO3a inhibition effectively prevented the impairment of trophoblast proliferation and invasion, and diminished the induction of trophoblast autophagy and apoptosis in METTL14-overexpressing HTR-8/SVneo cells. Discussion: Increased METTL14-mediated m 6 A modification results in an adverse impact on trophoblast function by elevating FOXO3a expression. Highlights: Increased m 6 A modification and METTL14 expression in preeclamptic placentas. METTL14 overexpression inhibits trophoblast proliferation and invasion. METTL14 overexpression induces trophoblast autophagy and apoptosis. METTL14 elevates FOXO3a expression through an m 6 A-dependent mechanism. FOXO3a inhibition rescues METTL14-impaired trophoblast function.