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Coexpression of Connexin45 with Connexin43 Decreases Gap Junction Size

机译:连接蛋白45与连接蛋白43的共表达可减小间隙连接处的大小

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摘要

In the human heart, ventricular myocytes express connexin43 (Cx43) and traces of Cx45. In congestive heart failure, Cx43 levels decrease, Cx45 levels increase and gap junction size decreases. To determine whether alterations of connexin coexpression ratio influence gap junction size, we engineered a rat liver epithelial cell line that endogenously expresses Cx43 to coexpress inducible levels of Cx45 under stimulation of the insect hormone, ponasterone A. In cells induced to express Cx45, gap junction sizes are significantly reduced (by 15% to 20%; p < 0.001), an effect that occurs despite increased levels of junctional connexons made from both connexins. In contrast, coexpression of Cx40 with Cx43 does not lead to any change in gap junction size. These results are consistent with the idea that increased Cx45 expression in the failing ventricle contributes to decreased gap junction size.
机译:在人的心脏中,心室肌细胞表达连接蛋白43(Cx43)和痕量的Cx45。在充血性心力衰竭中,Cx43水平降低,Cx45水平升高,间隙连接大小减小。为了确定连接蛋白共表达比例的变化是否影响间隙连接大小,我们设计了一种大鼠肝上皮细胞系,内源性表达Cx43以在昆虫激素ponasterone A的刺激下共表达诱导水平的Cx45。在诱导表达Cx45的细胞中,间隙连接尺寸显着减小(降低15%至20%; p <0.001),尽管两种连接蛋白制成的连接连接子水平增加,但仍会发生这种情况。相反,Cx40与Cx43的共表达不会导致间隙连接尺寸的任何变化。这些结果与这样的想法是一致的,即在衰竭的心室中增加的Cx45表达有助于减小间隙连接的大小。

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