期刊
GENES & GENETIC SYSTEMS
卷 94, 期 3, 页码 123-132出版社
GENETICS SOC JAPAN
DOI: 10.1266/ggs.18-00062
关键词
cellular aging; MCM2-7 proteins; DNA content; cellular localization; protein degradation
资金
- Japan Society for the Promotion of Science (Ministry of Education, Culture, Sports, Science and Technology of Japan)
Cellular aging is characterized by the loss of DNA replica Lion capaaiiity and is mainly brought about by various changes in chromatin structure. Here, we examined changes in MCM2-7 proteins, which act as a replicative DNA helicase, during aging of human WI38 fibroblasts at the single-cell level. We used nuclear accumulation of p21 as a marker of senescent cells, and examined changes in MCM2-7 by western blot analysis. First, we found that senescent cells are enriched for cells with a DNA content higher than 4N. Second, the levels of MCM2, MCM3, MCM4 and MCM6 proteins decreased in senescent cells. Third, cytoplasmic localization of MCM2 and MCM7 was observed in senescent cells, from an analysis of MCM2-7 except for MCM5. Consistent with this finding, fragmented MCM2 was predominant in these cells. These age-dependent changes in MCM2-7, a protein complex that directly affects cellular DNA replication, may play a critical role in cellular senescence.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据