Roussel Elise, Drolet Marie-Claude, Lavigne Anne-Marie, Arsenault Marie, Couet Jacques
Groupe de recherche sur les valvulopathies Centre de Recherche Institut universitaire de cardiologie et de pneumologie de Québec Université Laval Quebec City Canada.
FEBS Open Bio. 2018 Sep 17;8(10):1624-1635. doi: 10.1002/2211-5463.12506. eCollection 2018 Oct.
Cardiac hypertrophy (CH) is an important and independent predictor of morbidity and mortality. Through expression profiling, we recently identified a subset of genes (, , , , , , , , ), all of which are members of the short-chain dehydrogenase/reductase (SDR) superfamily and are highly expressed in the heart, that were significantly dysregulated in a rat model of CH caused by severe aortic valve regurgitation (AR). Here, we studied their expression in various models of CH, as well as factors influencing their regulation. Among the nine SDR genes studied, all but were down-regulated in CH models (AR rats or mice infused with either isoproterenol or angiotensin II). This regulation showed a clear sex dimorphism, being more evident in males than in females irrespective of CH levels. In neonatal rat cardiomyocytes, we observed that treatment with the α-adrenergic receptor agonist phenylephrine mostly reproduced the observations made in CH animals models. Retinoic acid, on the other hand, stimulated the expression of most of the SDR genes studied, suggesting that their expression may be related to cardiomyocyte differentiation. Indeed, levels of expression were found to be higher in the hearts of adult animals than in neonatal cardiomyocytes. In conclusion, we identified a group of genes modulated in animal models of CH and mostly in males. This could be related to the activation of the fetal gene expression program in pathological CH situations, in which these highly expressed genes are down-regulated in the adult heart.
心脏肥大(CH)是发病率和死亡率的重要独立预测指标。通过表达谱分析,我们最近鉴定出一组基因(……),它们均为短链脱氢酶/还原酶(SDR)超家族成员且在心脏中高表达,在严重主动脉瓣反流(AR)所致的CH大鼠模型中显著失调。在此,我们研究了它们在各种CH模型中的表达以及影响其调控的因素。在所研究的9个SDR基因中,除……外,其余基因在CH模型(AR大鼠或注射异丙肾上腺素或血管紧张素II的小鼠)中均下调。这种调控表现出明显的性别差异,无论CH水平如何,在雄性中比在雌性中更明显。在新生大鼠心肌细胞中,我们观察到用α-肾上腺素能受体激动剂去氧肾上腺素处理大多重现了在CH动物模型中的观察结果。另一方面,视黄酸刺激了所研究的大多数SDR基因的表达,表明它们的表达可能与心肌细胞分化有关。实际上,发现这些基因在成年动物心脏中的表达水平高于新生心肌细胞。总之,我们鉴定出一组在CH动物模型中受到调控且大多在雄性中受调控的基因。这可能与病理性CH情况下胎儿基因表达程序的激活有关,在这种情况下,这些高表达基因在成年心脏中下调。