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High iNOS mRNA and protein localization during late pregnancy suggest a role for nitric oxide in mouse pubic symphysis relaxation

机译:妊娠晚期iNOS mRNA和蛋白的高定位提示一氧化氮在小鼠耻骨联合放松中的作用

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Remodeling and relaxation of the mouse pubic symphysis (PS) are central events in parturition. The mouse PS remodels in a hormone-controlled process that involves the modification of the fibrocartilage into an interpubic ligament (IpL), followed by its relaxation prior to parturition. It is recognized that nitric oxide synthase (NOS) and consequently nitric oxide (NO) generation play important roles in extracellular matrix modification, and may promote cytoskeleton changes that contribute to the remodeling of connective tissue, which precedes the onset of labor. To our knowledge, no studies thus far have investigated inducible nitric oxide synthase (iNOS) expression, protein localization, and NO generation in the mouse PS during pregnancy. In this work, we used a combination of the immunolocalization of iNOS, its relative mRNA expression, and NO production to examine the possible involvement of iNOS in remodeling and relaxation of the mouse IpL during late pregnancy. The presence of iNOS was observed in chondrocytes and fibroblast-like cells in the interpubic tissues. In addition, iNOS mRNA and NO production were higher during preterm labor on Day 19 of pregnancy (D19) than NO production on D18 or in virgin groups. The significant increase in iNOS mRNA expression and NO generation from the partially relaxed IpL at D18 to the completely relaxed IpL at D19 may indicate that NO plays an important role in late pregnancy during relaxation of the mouse IpL. Mol. Reprod. Dev. 79: 272282, 2012
机译:小鼠耻骨联合(PS)的重塑和松弛是分娩的主要事件。小鼠PS在激素控制的过程中重塑,该过程涉及将纤维软骨修饰成耻骨韧带(IpL),然后在分娩前将其松弛。人们认识到,一氧化氮合酶(NOS)以及因此产生的一氧化氮(NO)在细胞外基质修饰中起着重要作用,并且可能促进细胞骨架变化,从而促进结缔组织的重塑,这是在分娩开始之前。据我们所知,到目前为止,还没有任何研究对妊娠期小鼠PS中的诱导型一氧化氮合酶(iNOS)表达,蛋白质定位和NO生成进行了研究。在这项工作中,我们结合使用iNOS的免疫定位,其相对mRNA表达和NO产生,以检查iNOS在妊娠晚期小鼠IpL的重塑和松弛中的可能参与。在耻骨间组织的软骨细胞和成纤维样细胞中观察到iNOS的存在。此外,在妊娠第19天(D19)的早产期间,iNOS mRNA和NO的产生要高于D18或原始组的NO产生。从D18的部分松弛的IpL到D19的完全松弛的IpL,iNOS mRNA表达和NO生成的显着增加可能表明NO在小鼠IpL松弛期间的晚期妊娠中起重要作用。大声笑责备。开发人员79:272282,2012

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