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<p>Huntington’s disease (HD) is a neurodegenerative disorder caused by mutations in the huntingtin gene resulting in an extended polyglutamine (polyQ) stretch in the protein, which is prone to aggregation and toxicity. In addition to a proteostasis imbalance, growing evidence highlights the role of mitochondrial dysfunction in HD progression. Here we explore the role of SIR-2.3/SIRT4, a mitochondrial sirtuin, in polyQ-expanded peptides and mutant huntingtin (mHTT) toxicity using <i>C. elegans</i> and mammalian models. Notably, loss of <i>sir-2.3</i> function results in neuronal protection mediated by AMPK activation and enhanced autophagy. These neuroprotective effects require the transcription factors DAF-16/FOXO and NHR-49, which regulate autophagy and metabolism. To explore the translational potential of these findings, we used soft ATP synthase inhibitors to mimic <i>sir-2.3</i> ablation, successfully reducing mHTT-induced neuronal toxicity. These results identify the SIRT4-AMPK axis as a critical regulator linking mitochondrial metabolism, autophagy, and neuronal homeostasis in HD. These findings not only advance our understanding of HD pathogenesis but also offer promising therapeutic targets for restoring proteostasis and neuronal resilience capacity against neurodegenerative diseases.</p>

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SIR-2.3/SIRT4 loss enhances proteostasis and neuronal resilience via AMPK-induced autophagy in Huntington’s disease models

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月15日

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  • Cristina Trujillo-del Río,
  • Seda Koyuncu,
  • Julia Tortajada-Pérez,
  • Mar Collado-Pérez,
  • Ana Pilar Gómez-Escribano,
  • Carlos Mora,
  • Christian Neri,
  • Agustín Lahoz,
  • Marta Roca,
  • José María Millán,
  • Yolanda Sanz,
  • David Vilchez,
  • Andrea del Valle Carranza,
  • Rafael P. Vázquez-Manrique

摘要

Huntington’s disease (HD) is a neurodegenerative disorder caused by mutations in the huntingtin gene resulting in an extended polyglutamine (polyQ) stretch in the protein, which is prone to aggregation and toxicity. In addition to a proteostasis imbalance, growing evidence highlights the role of mitochondrial dysfunction in HD progression. Here we explore the role of SIR-2.3/SIRT4, a mitochondrial sirtuin, in polyQ-expanded peptides and mutant huntingtin (mHTT) toxicity using C. elegans and mammalian models. Notably, loss of sir-2.3 function results in neuronal protection mediated by AMPK activation and enhanced autophagy. These neuroprotective effects require the transcription factors DAF-16/FOXO and NHR-49, which regulate autophagy and metabolism. To explore the translational potential of these findings, we used soft ATP synthase inhibitors to mimic sir-2.3 ablation, successfully reducing mHTT-induced neuronal toxicity. These results identify the SIRT4-AMPK axis as a critical regulator linking mitochondrial metabolism, autophagy, and neuronal homeostasis in HD. These findings not only advance our understanding of HD pathogenesis but also offer promising therapeutic targets for restoring proteostasis and neuronal resilience capacity against neurodegenerative diseases.