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首页> 外文期刊>Molecular and Cellular Biology >Repression of quiescence-specific polypeptides in chicken heart mesenchymal cells transformed by Rous sarcoma virus.
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Repression of quiescence-specific polypeptides in chicken heart mesenchymal cells transformed by Rous sarcoma virus.

机译:在劳斯肉瘤病毒转化的鸡心间质细胞中抑制静态特异性多肽。

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Chicken heart mesenchymal cells do not proliferate in medium of physiological composition containing plasma (S. Balk, Proc. Natl. Acad. Sci. USA 77:6606-6610, 1980). To understand the molecular events involved in cell quiescence and in the initiation of cell division under physiological conditions, we examined the differences in the patterns of protein synthesis of quiescent, hormone-stimulated, and Rous sarcoma virus-transformed chicken heart mesenchymal cells. We describe the expression of a 20,000-kilodalton (kDa) polypeptide actively synthesized by quiescent cells but not by their transformed counterparts. Normal chicken heart mesenchymal cells stimulated with epidermal growth factor and insulin also repressed the synthesis of the 20,000-kDa polypeptide while actively growing but synthesized increasing amounts of the protein at high cell density (confluence). The synthesis of the 20,000-kDa protein is not restricted to chicken heart mesenchymal cells, since confluent, density-arrested chicken embryo fibroblasts also expressed high levels of the protein. Transformed chicken heart mesenchymal cells and embryo fibroblasts did not synthesize the protein even at high cell density. The 20,000-kDa polypeptide accumulated in the culture medium.
机译:鸡心间充质细胞在含有血浆的生理组成的培养基中不增殖(S.Balk,美国国家科学院院刊77:6606-6610,1980)。为了了解在生理条件下细胞静止和细胞分裂启动中涉及的分子事件,我们研究了静止,激素刺激和劳斯肉瘤病毒转化的鸡心间充质细胞的蛋白质合成模式的差异。我们描述了静态细胞主动合成的20,000千达尔顿(kDa)多肽的表达,而不是其转化的对应物。用表皮生长因子和胰岛素刺激的正常鸡心间充质细胞也抑制了20,000-kDa多肽的合成,同时活跃地生长,但在高细胞密度下(融合)合成了越来越多的蛋白质。 20,000 kDa蛋白的合成不限于鸡心间充质细胞,因为融合的,密度停滞的鸡胚成纤维细胞也表达了高水平的蛋白。转化的鸡心间充质细胞和胚胎成纤维细胞即使在高细胞密度下也无法合成蛋白质。在培养基中积累了20,000kDa的多肽。

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