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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >3-Ketoacyl thiolase delays aging of Caenorhabditis elegans and is required for lifespan extension mediated by sir-2.1
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3-Ketoacyl thiolase delays aging of Caenorhabditis elegans and is required for lifespan extension mediated by sir-2.1

机译:3-酮酰基硫解酶可延缓秀丽隐杆线虫的衰老,是sir-2.1介导的寿命延长所必需的

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摘要

Studies of long-lived Caenorhabditis elegans mutants have identi fied several genes that function to limit lifespan, i.e., loss-of-func tion mutations in these genes promote longevity. By contrast, little is known about genes that normally act to delay aging and that when mutated cause premature aging (progeria). To seek such genes, we performed a genetic 6creen for C. elegans mutants that age prematurely. We found that loss-of-function mutations of the ketoacyl thiolase gene kat-1 result in an increased accumulation of the lipofuscin-like fluorescent aging pigment, shortened lifespan, early behavioral decline, and other abnormalities characteristic of premature aging. These findings suggest that kat-1 acts to delay C elegans aging, kat-1 encodes a conserved metabolic enzyme that catalyzes the last step of fatty acid oxidation and was previously shown to regulate fat accumulation in worms. We observed that kat-1 is required for the extension of lifespan and enhanced ther motolerance mediated by extra copies of the deacetylase gene sir 2.1. kat-1 acts independently of other known pathways that affect longevity. Our findings suggest that defects in fatty acid oxidation can limit lifespan and accelerate aging in C. elegans and that kat-1-mediated fatty acid oxidation is crucial for overexpressed sir-2.1 to delay aging.
机译:对长寿命秀丽隐杆线虫突变体的研究已鉴定出几个功能有限的基因,即这些基因中的功能缺失突变可延长寿命。相比之下,人们对正常起到延缓衰老作用的基因知之甚少,而这些基因突变会导致早衰(早衰)。为了寻找此类基因,我们对早衰的秀丽隐杆线虫突变体进行了6creen的遗传分析。我们发现,酮酰基硫解酶基因kat-1的功能丧失突变导致脂褐素样荧光衰老色素的积累增加,寿命缩短,早期行为下降以及其他过早衰老的异常特征。这些发现表明,kat-1起到延缓线虫衰老的作用,kat-1编码一种保守的代谢酶,催化脂肪酸氧化的最后一步,并且先前显示出它可以调节蠕虫中的脂肪积累。我们观察到,kat-1是延长寿命和由脱乙酰基酶基因sir 2.1的额外拷贝介导的增强的热耐受性所必需的。 kat-1的作用独立于其他影响寿命的途径。我们的发现表明,脂肪酸氧化缺陷会限制秀丽隐杆线虫的寿命并加速衰老,而kat-1介导的脂肪酸氧化对于过表达的sir-2.1延缓衰老至关重要。

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    Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139 Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139 Department of Cardiovascular Metabolism, Novartis Institute for Biomedical Research, Cambridge, MA 02139;

    rnHoward Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139 Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139;

    rnHoward Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139 Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139;

    rnDepartment of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139 Cowen and Company, 1221 Avenue of the Americas, New York, NY 10020;

    rnDepartment of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139 Paul F. Glenn Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139;

    rnHoward Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139 Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139 Department of Cardiovascular Metabolism, Novartis Institute for Biomedical Research, Cambridge, MA 02139;

  • 收录信息 美国《科学引文索引》(SCI);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
  • 关键词

    progeria; lipofuscin; fatty acid oxidation; sirtuins; protein deacetylation;

    机译:早衰脂褐素脂肪酸氧化;sirtuins;蛋白质脱乙酰;

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