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首页> 外文期刊>Cytokine >Expression and activity of 2-5A synthetase in the course of differentiation and apoptosis of PC12 cells.
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Expression and activity of 2-5A synthetase in the course of differentiation and apoptosis of PC12 cells.

机译:2-5A合成酶在PC12细胞分化和凋亡过程中的表达和活性。

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摘要

The role of IFN-induced 2-5A system in cell differentiation has not been elucidated. While studying differentiation of PC12 cells we found that the simultaneous treatment of cells with NGF and IFN-gamma in serum-containing medium resulted first in the extension of neurites and then apoptosis. On the contrary, in serum-free medium the cells underwent a more rapid neuronal differentiation. Only the doses of NGF which induced the outgrowth of neurites from the cells were able to induce rapid cell death in combined treatment. When the cells were treated subsequently with NGF and IFN-gamma, the induction of death was observed with NGF post-treatment, but not with NGF pretreatment. Relying on these alternative biological responses, we studied the changes in 2-5A synthetase activity and its 43 kDa isoform expression in the course of differentiation and death of PC12 cells. The results of the present work showed that NGF-induced differentiation of the cells did not evoke any increase in 2-5A synthetase activity or any increase in the expression of its 43 kDa isoform. Moreover, the obtained results demonstrated that NGF could not significantly affect the IFN-induced signalling pathway leading to the activation of 2-5A synthetase gene, at least regarding the studied enzyme activity. Copyright 2000 Academic Press.
机译:尚未阐明IFN诱导的2-5A系统在细胞分化中的作用。在研究PC12细胞的分化过程中,我们发现在含血清的培养基中同时用NGF和IFN-γ处理细胞会首先导致神经突扩展,然后导致细胞凋亡。相反,在无血清培养基中,细胞经历了更快的神经元分化。在联合治疗中,只有诱导神经突从细胞中生长出来的NGF剂量才能诱导细胞快速死亡。当随后用NGF和IFN-γ处理细胞时,在NGF后处理中观察到死亡诱导,但在NGF预处理中未观察到死亡诱导。依靠这些替代的生物学反应,我们研究了PC-5细胞分化和死亡过程中2-5A合成酶活性及其43 kDa同工型表达的变化。本工作的结果表明,NGF诱导的细胞分化未引起2-5A合成酶活性的任何增加或其43 kDa同工型的表达的任何增加。此外,所获得的结果表明,至少就所研究的酶活性而言,NGF不能显着影响IFN诱导的信号通路,从而导致2-5A合成酶基因的活化。版权所有2000学术出版社。

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