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首页> 外文期刊>Journal of Cellular Physiology >JAK2 mediates the acute response to decreased cell volume in mouse preimplantation embryos by activating NHE1
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JAK2 mediates the acute response to decreased cell volume in mouse preimplantation embryos by activating NHE1

机译:JAK2介导急性反应降低了细胞卷在老鼠胚胎植入前的胚胎

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Preimplantation mouse embryos are particularly sensitive to increased osmolarity within their normal physiological range. The detrimental effects can be alleviated by organic osmolytes such as glycine transported into early embryos, an effect thought to be due to the organic osmolyte replacing a portion of intracellular inorganic ions accumulated during acute cell volume regulation. However, no mechanism of cell volume regulation dependent on inorganic ions has been identified in preimplantation embryos. We found that decreased cell volume rapidly activated Na +/H + exchange in preimplantation mouse embryos. This activity was likely mediated by the NHE1 (Slc9a1) isoform, since it was blocked by the highly selective NHE1 inhibitor, cariporide, which also inhibited the ability of the 1-cell embryo to maintain cell volume. How NHE1 is activated by decreased cell volume is not generally well understood. Full activation of NHE1 by decreased cell volume in 2-cell mouse embryos required the activity of the tyrosine kinase Janus kinase 2 (Jak2), since NHE1 activation was inhibited by the general tyrosine kinase inhibitor genistein, several selective inhibitors of Jak2, and dominant negative Jak2 expressed in 2-cell embryos. Decreased cell volume furthermore resulted in increased tyrosine phosphorylation of proteins in 2-cell embryos detected both by anti-phosphotyrosine antibody and an antibody directed against active phospho-Jak2. Thus, Jak2 apparently serves as a cell volume sensor in embryos. Evidence from pharmacological inhibitors further indicated that NHE1 activation by decreased cell volume was dependent on calmodulin activity, likely downstream of Jak2, and required active phospholipase C.
机译:胚胎植入前的小鼠胚胎尤其敏感的内渗透性增加正常生理范围。可以通过有机osmolytes缓解效果如甘氨酸运输到早期胚胎,认为是由于有机产生影响osmolyte取代部分细胞内无机离子积累在急性细胞音量调节。音量调节依赖无机离子在胚胎植入前的胚胎被识别。发现细胞体积迅速下降激活Na + / H +在胚胎植入前的交换老鼠胚胎。NHE1 (Slc9a1)同种型,因为它是被高度选择性NHE1抑制剂,cariporide,也抑制的能力1-cell胚胎维持细胞体积。NHE1被激活,细胞体积不下降都很了解。NHE1通过减少细胞体积都有老鼠胚胎需要酪氨酸的活动激酶Janus激酶2 (Jak2),因为NHE1抑制了激活酪氨酸激酶抑制剂染料木黄酮,几个选择性Jak2抑制剂,主要负面Jak2都有表达的胚胎。体积而且导致增加酪氨酸磷酸化的蛋白质都有胚胎发现通过anti-phosphotyrosine抗体和抗体针对活跃phospho-Jak2。在胚胎细胞体积传感器。药理抑制剂进一步表示NHE1激活细胞体积减少依赖于钙调蛋白的活动,有可能Jak2的下游,需要活跃磷脂酶C。

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