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Apoptosis in the developing human heart resembles apoptosis in epithelial tissues

机译:发育中的人心脏中的凋亡类似于上皮组织中的凋亡

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It is widely accepted that apoptosis plays an important role in the development of the heart as well as in different heart diseases. Despite extensive research efforts, many issues regarding apoptosis in the heart remain unsolved, including the detection of apoptotic cardiomyocytes, their morphological features, the mechanisms of their removal and the clinical significance of apoptosis in the heart. It has been suggested that fetal cardiomyocytes resemble epithelial tissues. To test this hypothesis, we analyzed the expression of an epithelial marker cytokeratin 18 (CK18) and caspase-cleaved-CK18, recognized by antibody M30, as well as the expression of cleaved caspase-3 and desmosomal and classical cadherins, major components of desmosomes and adherens junctions in fetal hearts in comparison to infant and adult human hearts. We found that, in fetal hearts, cardiomyocytes expressed CK18 and that apoptotic cardiomyocytes expressed caspase-cleaved CK18, being recognized by antibody M30. Furthermore, desmosomal and classical cadherins exhibited a membraneous reaction similar to epithelial tissues. In adults and children after the age of 6 months, cadherins were localized in the intercalated disks, cardiomyocytes lost CK18 expression and apoptotic cardiomyocytes were no longer recognized by M30. We conclude that apoptosis in the developing human heart resembles apoptosis in epithelial tissues, exhibiting different characteristics than in the adult human heart.
机译:细胞凋亡在心脏的发育以及各种心脏病中起着重要作用,这一点已被广泛接受。尽管进行了广泛的研究,但关于心脏凋亡的许多问题仍未解决,包括凋亡性心肌细胞的检测,其形态学特征,其清除机制以及心脏凋亡的临床意义。已经提出,胎儿心肌细胞类似于上皮组织。为了验证这一假设,我们分析了抗体M30识别的上皮标记细胞角蛋白18(CK18)和caspase裂解的CK18的表达,以及裂解的caspase-3和桥粒和经典钙黏着蛋白(桥粒的主要成分)的表达。与婴儿和成人心脏相比,胎儿心脏的黏附连接处。我们发现,在胎儿心脏中,心肌细胞表达了CK18,而凋亡的心肌细胞表达了胱天蛋白酶切割的CK18,被抗体M30识别。此外,桥粒和经典钙黏着蛋白表现出类似于上皮组织的膜状反应。在6个月大的成年人和儿童中,钙黏着蛋白位于插入盘中,心肌细胞失去CK18表达,而M30不再识别凋亡性心肌细胞。我们得出的结论是,发育中的人心脏中的细胞凋亡类似于上皮组织中的细胞凋亡,表现出与成年人心脏中不同的特征。

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