Laboy Raymond, Ndoci Marjana, Syed Shamsh Tabrez, Vonolfen Maximilian, Ballhysa Eugen, Droth Tim, Schilling Klara, Loehrke Anna, Atanassov Ilian, Antebi Adam
Department of Molecular Genetics of Ageing, Max Planck Institute for Biology of Ageing, Cologne, Germany.
Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.
Elife. 2025 Aug 11;12:RP89225. doi: 10.7554/eLife.89225.
The transcriptional complex Mondo/Max-like, MML-1/MXL-2, acts as a convergent transcriptional regulatory output of multiple longevity pathways in . These transcription factors coordinate nutrient sensing with carbohydrate and lipid metabolism across the evolutionary spectrum. While most studies have focused on the downstream outputs, little is known about the upstream inputs that regulate these transcription factors in a live organism. Here, we found that knockdown of various glucose metabolic enzymes decreases MML-1 localization in the nucleus and identified two hexokinase isozymes, and as the most vigorous regulators of MML-1 function. Upon hexokinase knockdown, MML-1 redistributes to mitochondria and lipid droplets (LDs), and concomitantly, transcriptional targets are downregulated and germline longevity is abolished. Further, we found that regulates MML-1 through mitochondrial β-oxidation, while regulates MML-1 by modulating the pentose phosphate pathway (PPP) and its coordinated association with LDs. Similarly, inhibition of the PPP rescues mammalian MondoA nuclear translocation and transcriptional function upon starvation. These studies reveal how metabolic signals and organellar communication regulate a key convergent metabolic transcription factor to promote longevity.
转录复合物Mondo/Max样蛋白MML-1/MXL-2,是多种长寿途径在……中的一个汇聚转录调节输出。这些转录因子在整个进化谱系中协调营养感知与碳水化合物和脂质代谢。虽然大多数研究集中在下游输出,但对于在活生物体中调节这些转录因子的上游输入知之甚少。在这里,我们发现敲低各种葡萄糖代谢酶会降低MML-1在细胞核中的定位,并确定两种己糖激酶同工酶……和……是MML-1功能最有力的调节因子。在敲低己糖激酶后,MML-1重新分布到线粒体和脂滴(LDs),同时,转录靶点下调,生殖系寿命被消除。此外,我们发现……通过线粒体β-氧化调节MML-1,而……通过调节磷酸戊糖途径(PPP)及其与脂滴的协调关联来调节MML-1。同样,抑制PPP可挽救饥饿时哺乳动物MondoA的核转位和转录功能。这些研究揭示了代谢信号和细胞器通讯如何调节一个关键的汇聚代谢转录因子以促进长寿。
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