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Mice and mitochondria

机译:小鼠和线粒体

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摘要

It can be hard to work out whether particular events are a cause or a correlate of ageing -- do mutations in mitochondrial DNA, for instance, speed up the process of growing old? Some clever studies suggest so. Mitochondria are little pockets of energy within cells, shouldering the important task of converting food into usable energy forms. To meet demands, every cell contains thousands of them. Unlike most other cellular compartments, mitochondria have their own genomes, which encode a few mitochondrial proteins (most others being encoded by genes in the nucleus). In numerous non-reproductive tissues of many species, mitochondrial genes (like nuclear genes) accumulate mutations as the animals age, and it has been speculated that these mutations might in fact cause ageing, by leading to energy-generation defects -- increased numbers of harmful reactive oxygen species, cellular damage and so on. On the other hand, the association between mitochondrial mutations and ageing could merely be correlative -- these mutations might simply be one of the manifestations of growing old. That possibility becomes less likely, however, with the publication of the paper on page 417 of this issue by Trifunovic and colleagues.
机译:很难弄清特定事件是衰老的原因还是衰老的相关因素,例如,线粒体DNA的突变会加速衰老的过程吗?一些聪明的研究表明。线粒体是细胞内能量的小口袋,肩负着将食物转化为可用能量形式的重要任务。为了满足需求,每个单元包含数千个。与大多数其他细胞区室不同,线粒体具有自己的基因组,该基因组编码一些线粒体蛋白(其他大多数由细胞核中的基因编码)。在许多物种的许多非生殖组织中,线粒体基因(如核基因)会随着动物的衰老而积累突变,并且据推测,这些突变实际上可能会导致衰老,从而导致能量产生缺陷-数量增加。有害的活性氧种类,细胞损伤等。另一方面,线粒体突变与衰老之间的关联可能只是相关的-这些突变可能只是衰老的一种表现。但是,随着Trifunovic及其同事在本期第417页上发表论文的可能性越来越小。

著录项

  • 来源
    《Nature》 |2004年第6990期|p.357359|共2页
  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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