Rhapontigenin attenuates neurodegeneration in a parkinson’s disease model by downregulating mtDNA-cGAS-STING-NF-κB-mediated neuroinflammation via PINK1/DRP1-dependent microglial mitophagy

作者：Zhongqiang Su, Hui Shu, Xingting Huang, Liuyan Ding, Fengchu Liang, Zongtang Xu, Ziting Zhu, Minshan Chen, Xiaobei Wang, Guihua Li, Huan Xia, Qiannan Cao, Wenlong Zhang, Pingyi Xu, Xinling Yang · 发表于：Cellular and Molecular Life Sciences · 年份：2025 · DOI：10.1007/s00018-025-05873-9 · 被引用次数：17 · 研究领域：Neuroinflammation and Neurodegeneration Mechanisms、RNA regulation and disease、Autophagy in Disease and Therapy

Microglial activation-induced neuroinflammation and impaired neuronal mitophagy are recognized as pivotal pathogeneses in Parkinson's disease (PD). However, the role of microglial mitophagy in microglial activation during PD development remains unclear, and therapeutic interventions targeting this interaction are lacking. Rhapontigenin (Rhap), a stilbenoid enriched in Vitis vinifera, exhibits dual anti-neuroinflammatory and mitophagy-enhancing properties, but its therapeutic potential and mechanisms in PD are unexplored. This study aimed to investigate the therapeutic efficacy of Rhap on neurodegeneration in a PD model and explore its underlying mechanism. Here, we showed that Rhap administration significantly ameliorated motor deficits, dopaminergic neuron loss, and neuroinflammation in MPTP-induced PD mice. Mechanistically, Rhap suppressed neuroinflammation by inhibiting the cGAS-STING-NF-κB signaling axis in both PD model mice and MPP⁺-induced BV2 microglia. Crucially, its anti-inflammatory effects depend on the PINK1-mediated enhancement of microglial mitophagy to control cytosolic mtDNA leakage. Specifically, Rhap bound to PINK1 strengthened the PINK1-DRP1 interaction, promoted mitochondrial fission in damaged organelles, and enhanced mitophagy clearance. This mitophagy activation prevents cytosolic leakage of mitochondrial DNA (mtDNA), thereby attenuating mtDNA-cGAS-STING-NF-κB-derived neuroinflammation and subsequent neurodegeneration in PD. PINK1 deficiency in BV2 mic...