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Lo, Hsiao‐Fan; Tsai, Ching‐Yen; Chen, Chie‐Pein; Wang, Liang‐Jie; Lee, Yun‐Shien; Chen, Chia‐Yu; Liang, Chung‐Tiang; Cheong, Mei‐Leng; Chen, Hungwen
The Journal of pathology, February 2017, 2017-Feb, 20170201, Letnik: 241, Številka: 3Journal Article
The transcription factor glial cells missing 1 (GCM1) regulates trophoblast differentiation and function during placentation. Decreased GCM1 expression is associated with pre‐eclampsia, suggesting that abnormal expression of GCM1 target genes may contribute to the pathogenesis of pregnancy complications. Here we identified a novel GCM1 target gene, synapse defective 1 (SYDE1), which encodes a RhoGAP that is highly expressed in human placenta, and demonstrated that SYDE1 promotes cytoskeletal remodelling and cell migration and invasion. Importantly, genetic ablation of murine Syde1 results in small fetuses and placentas with aberrant phenotypes in the placental–yolk sac barrier, maternal–trophoblast interface, and placental vascularization. Microarray analysis revealed altered expression of renin‐1, angiotensin I converting enzyme 2, angiotensin II type 1a receptor, and membrane metalloendopeptidase of the renin–angiotensin system in Syde1‐knockout placenta, which may compensate for the vascular defects to maintain normal blood pressure. As pregnancy proceeds, growth restriction of the Syde1−/− fetuses and placentas continues, with elevated expression of the Syde1 homologue Syde2 in placenta. Syde2 may compensate for the loss of Syde1 function because SYDE2, but not the GAP‐dead SYDE2 mutant, reverses migration and invasion activities of SYDE1‐knockdown JAR trophoblast cells. Clinically, we further detected decreased SYDE1 expression in preterm and term IUGR placentas compared with gestational age‐matched controls. Our study suggests a novel mechanism for GCM1 and SYDE1 in regulation of trophoblast cell migration and invasion during placental development and that decreased SYDE1 expression is associated with IUGR. Copyright © 2016 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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