S-glutathionylation modification of proteins and the association with cellular death (Review)

Sun,Xiongxing; Xie,Le; Wang,Shiliang; Zeng,Shanshan; Wu,Lingying; Tang,Xukun; Zhu,Jiajian; Lin,Shigao; Hu,Tenghui; Jia,Lin; Li,Xia; Zhang,Songqing; Deng,Jun; Wu,Dahua

doi:10.3892/mi.2025.263

S-glutathionylation modification of proteins and the association with cellular death (Review)

Authors:
- Xiongxing Sun
- Le Xie
- Shiliang Wang
- Shanshan Zeng
- Lingying Wu
- Xukun Tang
- Jiajian Zhu
- Shigao Lin
- Tenghui Hu
- Lin Jia
- Xia Li
- Songqing Zhang
- Jun Deng
- Dahua Wu
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Affiliations: Graduate School of Hunan University of Chinese Medicine, Changsha, Hunan 410208, P.R. China, Hunan Provincial Hospital of Integrated Traditional Chinese and Western Medicine (The Affiliated Hospital of Hunan Academy of Traditional Chinese Medicine), Changsha, Hunan 410060, P.R. China, Shimen County Traditional Chinese Medicine Hospital, Changde, Hunan 415300, P.R. China, Xiangxi Tujia and Miao Autonomous Prefecture Ethnic Traditional Chinese Medicine Hospital, Jishou, Hunan 416000, P.R. China
Published online on: August 22, 2025 https://doi.org/10.3892/mi.2025.263
Article Number: 64
Copyright : © Sun et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY 4.0].

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Abstract

S-glutathionylation (SSG), a redox-sensitive post-translational modification mediated by glutathione, regulates protein structure and function through reversible disulfide bond formation at cysteine residues. Glutaredoxins (GRXs), pivotal antioxidant enzymes, catalyze SSG dynamics to maintain thiol homeostasis. Recent advances in redox proteomics have revealed that SSG dysregulation is intricately linked to neurodegenerative, cardiovascular, pulmonary and malignant diseases. Notably, GRX isoforms (GRX1 and GRX2) play compartment-specific roles in disease pathogenesis: GRX1 modulates hepatic lipid metabolism and pulmonary fibrosis, while GRX2 sustains mitochondrial redox balance and Fe-S cluster assembly. Notably, SSG functions as a ‘double-edged sword’ in programmed cell death (PCD). While moderate SSG protects against irreversible cysteine oxidation, persistent SSG accumulation due to GRX dysfunction triggers apoptosis, necroptosis and ferroptosis by disrupting redox-sensitive targets, such as caspases, BAX and glutathione peroxidase 4. The present review summarizes, for the first time, at least to the best of our knowledge, the association of SSG with distinct PCD subtypes, and highlights therapeutic strategies targeting GRX activity or site-specific SSG modulation (e.g., pyruvate kinase M2 Cys423/424). Emerging approaches, including GRX mimetics and thiol-targeted drugs, hold promise for precision medicine in redox-related pathologies.

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