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Identification of cardiac stem cells within mature cardiac myocytes

机译:鉴定成熟心肌细胞内的心脏干细胞

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Cardiac stem cells are described in a number of mammalian species including humans. Cardiac stem cell clusters consisting of both lineage-negative and partially committed cells are generally identified between contracting cardiac myocytes. In the present study, c-kit(+), Sca(+), and Isl1(+) stem cells were revealed to be located inside the sarcoplasm of cardiac myocytes in myocardial cell cultures derived from newborn, 20-, and 40-day-old rats. Intracellularly localized cardiac stem cells had a coating or capsule with a few pores that opened into the host cell sarcoplasm. The similar structures were also identified in the suspension of freshly isolated myocardial cells (ex vivo) of 20- and 40-day-old rats. The results from this study provide direct evidence for the replicative division of encapsulated stem cells, followed by their partial cardiomyogenic differentiation. The latter is substantiated by the release of multiple transient amplifying cells following the capsule rupture. In conclusion, functional cardiac stem cells can reside not only exterior to but also within cardiomyocytes.
机译:心脏干细胞在包括人类在内的许多哺乳动物中都有描述。通常在收缩的心肌细胞之间鉴定出由谱系阴性和部分定型细胞组成的心脏干细胞簇。在本研究中,c-kit(+),Sca(+)和Isl1(+)干细胞在新生,20天和40天的心肌细胞培养物中显示位于心肌细胞的肌浆内年老的老鼠。细胞内定位的心脏干细胞具有涂层或囊膜,该囊膜或囊膜上有一些开向宿主细胞肌浆的孔。在20日龄和40日龄大鼠的新鲜分离的心肌细胞(离体)的悬浮液中也鉴定出相似的结构。这项研究的结果为封装的干细胞的复制分裂及其随后的部分心肌原性分化提供了直接的证据。后者通过在胶囊破裂后释放多个瞬时扩增细胞来证实。总之,功能性心脏干细胞不仅可以驻留在心肌细胞外部,还可以驻留在心肌细胞内部。

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