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Identification of corticosteroid-regulated genes in cardiomyocytes by serial analysis of gene expression.

机译:通过基因表达的系列分析鉴定心肌细胞中糖皮质激素调节的基因。

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Corticosteroids (aldosterone, cortisol/corticosterone) exert direct functional effects on cardiomyocytes. However, gene networks activated by corticosteroids in cardiomyocytes, as well as the involvement of the mineralocorticoid receptor (MR) vs the glucocorticoid receptor (GR) in these effects, remain largely unknown. Here we characterized the corticosteroid-dependent transcriptome in primary culture of neonatal mouse cardiomyocytes treated with 10(-6) M aldosterone, a concentration predicted to occupy both MR and GR. Serial analysis of gene expression revealed 101 aldosterone-regulated genes. The MR/GR specificity was characterized for one regulated transcript, namely ecto-ADP-ribosyltransferase-3 (Art3). Using cardiomyocytes from GR(nullull) or MR(nullull) mice we demonstrate that in GR(nullull) cardiomyocytes the response is abrogated, but it is fully maintained in MR(nullull) cardiomyocytes. We conclude that Art3 expression is regulated exclusively via the GR. Our study identifies a new set of corticosteroid-regulated genes in cardiomyocytes and demonstrates a new approach to studying the selectivity of MR- vs GR-dependent effects.
机译:皮质类固醇(醛固酮,皮质醇/皮质酮)对心肌细胞具有直接的功能作用。然而,在心肌细胞中由皮质类固醇激活的基因网络,以及盐皮质激素受体(MR)与糖皮质激素受体(GR)的参与仍不清楚。在这里,我们表征了用10(-6)M醛固酮治疗的新生小鼠心肌细胞的初代培养物中的皮质类固醇依赖性转录组,该浓度预计同时占据MR和GR。基因表达的系列分析揭示了101个醛固酮调节的基因。 MR / GR特异性表征了一种受调控的转录本,即ecto-ADP-核糖基转移酶-3(Art3)。使用来自GR(null / null)或MR(null / null)小鼠的心肌细胞,我们证明了GR(null / null)心肌细胞中的反应被消除,但在MR(null / null)心肌细胞中完全保持了响应。我们得出结论,Art3表达仅通过GR调控。我们的研究确定了心肌细胞中一组新的皮质类固醇调节基因,并展示了一种新的方法来研究MR依赖与GR依赖的选择性。

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