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首页> 外文期刊>Journal of Cellular Physiology >Alterations in the molecular response to DNA damage during cellular aging of cultured fibroblasts: reduced AP-1 activation and collagenase gene expression.
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Alterations in the molecular response to DNA damage during cellular aging of cultured fibroblasts: reduced AP-1 activation and collagenase gene expression.

机译:改变DNA分子的反应在培养的细胞老化损坏成纤维细胞:AP-1激活和减少胶原酶基因的表达。

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摘要

Transcriptional activation of c-fos in response to both serum stimulation and DNA damage requires the serum response element. The inability of in vitro aged or senescent fibroblasts to proliferate in response to serum has been shown to be associated with repressed c-fos expression and reduced AP-1 binding activity. In contrast, we have observed similar levels of c-fos mRNA and protein expression in young (early passage) and old (late passage) cells following their treatment with ultraviolet (UV) irradiation or methyl methanesulfonate (MMS). Thus, the early events in the signal transduction pathway leading to transcriptional activation of c-fos following DNA damage are distinct from those mediating the gene's expression in response to mitogenic stimulation. Despite normal levels of c-fos expression, we observed a reduced level of AP-1 binding activity in old cells relative to young cells treated with UV irradiation or MMS. Reduced AP-1 binding activity is associated with reduced expression of the AP-1-dependent gene, collagenase, in old cells treated with DNA damaging agents. Since other DNA damage-inducible genes also contain an AP-1 regulatory element presumed to play a role in their expression, reduced AP-1 binding activity is likely to have a major impact on the old cell's ability to respond appropriately to DNA damage.
机译:转录激活c-fos的回应血清刺激和DNA损伤血清反应元素。体外老化或衰老成纤维细胞扩散在血清已被证明与压抑有关c-fos表达式和减少AP-1绑定活动。我们发现类似c-fos mRNA水平年轻(早期通道)和蛋白表达老后(通过后期)细胞紫外线(UV)照射治疗甲基显示(MMS)。信号转导通路中的主要事件转录激活c-fos以下DNA损伤是不同于那些中介基因的表达以应对促有丝分裂的刺激。表达式,我们观察AP-1水平的降低绑定活动老细胞相对年轻细胞受到紫外线照射或MMS。AP-1绑定活动是与减少有关AP-1-dependent基因的表达,胶原酶,在老细胞处理DNA破坏性的代理。基因也包含一个AP-1监管元素假定扮演一个角色在他们的表情,活动可能是减少AP-1绑定主要对老细胞的反应能力的影响适当的DNA损伤。

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