Scholarlink

<p>Glycosylation defects are increasingly implicated across neurodegenerative diseases, yet the mechanism by which perturbed O-mannosylation drives neuronal death—and how to reverse it—remains unclear. Here we show that a disease-associated <i>POMGnT1</i> L120R mutation produces widespread retinal neurodegeneration by coupling metabolic collapse to necroptosis. In mice harboring the human <i>POMGnT1</i> L120R allele and in <i>POMGnT1</i>-knockout human RPE cells, hypoglycosylation of key substrates (α-dystroglycan and ENO1) coincides with strengthened SAG–ENO1 interaction, reduced glycolytic capacity, ATP shortfall, Golgi fragmentation, tight-junction failure, and robust activation of the RIPK1/RIPK3/MLKL cascade; notably, degeneration proceeds with minimal apoptotic signatures. Two orthogonal interventions—AAV8-mediated <i>POMGnT1</i> gene augmentation and pharmacologic RIPK1 inhibition (RIPA-56)—each suppress necroptotic signaling, restore barrier integrity, and rescue visual function in vivo. These data define a glycosylation-metabolism-necroptosis axis that generalizes beyond a single gene or tissue and motivate a mutation-independent therapeutic blueprint: repair the upstream glycosylation deficit and/or block the downstream necroptotic execution pathway. Our findings position O-mannosylation homeostasis as a tractable control point for neuroprotection and nominate combined gene-augmentation and kinase-inhibition strategies for glycosylation-linked neurodegeneration.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Glycosylation-driven necroptosis in retinal degeneration: dual rescue by AAV8 gene therapy and RIPK1 inhibition

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月9日

查看全文
  • Jia-Ying Chien,
  • Peng Yeong Woon,
  • Hsien-Yang Tsai,
  • Mei-Ling Peng,
  • Shi-Huang Lee,
  • Siu-Fung Chau,
  • Yu-Chen Chen,
  • Wai-Man Cheang,
  • Ching-Yen Tsai,
  • Shun-Ping Huang

摘要

Glycosylation defects are increasingly implicated across neurodegenerative diseases, yet the mechanism by which perturbed O-mannosylation drives neuronal death—and how to reverse it—remains unclear. Here we show that a disease-associated POMGnT1 L120R mutation produces widespread retinal neurodegeneration by coupling metabolic collapse to necroptosis. In mice harboring the human POMGnT1 L120R allele and in POMGnT1-knockout human RPE cells, hypoglycosylation of key substrates (α-dystroglycan and ENO1) coincides with strengthened SAG–ENO1 interaction, reduced glycolytic capacity, ATP shortfall, Golgi fragmentation, tight-junction failure, and robust activation of the RIPK1/RIPK3/MLKL cascade; notably, degeneration proceeds with minimal apoptotic signatures. Two orthogonal interventions—AAV8-mediated POMGnT1 gene augmentation and pharmacologic RIPK1 inhibition (RIPA-56)—each suppress necroptotic signaling, restore barrier integrity, and rescue visual function in vivo. These data define a glycosylation-metabolism-necroptosis axis that generalizes beyond a single gene or tissue and motivate a mutation-independent therapeutic blueprint: repair the upstream glycosylation deficit and/or block the downstream necroptotic execution pathway. Our findings position O-mannosylation homeostasis as a tractable control point for neuroprotection and nominate combined gene-augmentation and kinase-inhibition strategies for glycosylation-linked neurodegeneration.