Abstract
Intervertebral disc degeneration (IDD) is the most important pathological basis of degenerative spinal diseases, for which effective interventions are still lacking. Oxidative stress is considered to be one of the leading pathological mechanisms contributing to IDD. However, the exact role of DJ-1 as an essential member of the antioxidant defense system in IDD is still unclear. Therefore, the aim of this study was to investigate the role played by DJ-1 in IDD and to reveal its potential molecular mechanisms. Western blot and immunohistochemical staining assays were performed to detect the expression of DJ-1 in degenerative nucleus pulposus cells (NPCs). After overexpression of DJ-1 in NPCs by lentiviral transfection, DCFH-DA and MitoSOX fluorescent probes were used to evaluate the levels of reactive oxygen species (ROS); while western blot, TUNEL staining, and Caspase-3 activity were used to assess apoptosis. Immunofluorescence staining was used to demonstrate the relationship between DJ-1 and p62. After inhibition of lysosomal degradation function with chloroquine, p62 degradation and apoptosis in DJ-1 overexpressing NPCs were further examined. In vivo, we assessed the therapeutic effect of upregulated DJ-1 on IDD by X-ray, MRI and Safranin O-Fast green staining. The protein expression of DJ-1 was significantly decreased in degenerated NPCs, accompanied by increased apoptosis. However, overexpression of DJ-1 significantly inhibited the elevated ROS levels and apoptosis in NPCs under oxidative stress. Mechanistically, our results showed that upregulation of DJ-1 promoted p62 degradation via the autophagic lysosomal pathway and that the protective effect of DJ-1 on NPCs under oxidative stress was partially mediated by promoting lysosomal pathway degradation of p62. Moreover, intradiscal injection of adeno-associated virus for overexpression of DJ-1 mitigated the progression of IDD in rats. This study reveals that DJ-1 maintains the homeostasis of NPCs by promoting the degradation of p62 through the autophagic lysosomal pathway, suggesting that DJ-1 is a promising new target for IDD intervention.
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Data availability
The datasets generated and/or analyzed during the current study are available in the manuscript and supplementary materials.
Abbreviations
- IDD:
-
Intervertebral disc degeneration
- NPCs:
-
Nucleus pulposus cells
- ROS:
-
Reactive oxygen species
- LBP:
-
Low back pain
- NP:
-
Nucleus pulposus
- AF:
-
Annulus fibrosus
- DMEM/F12:
-
Dulbecco's Modified Eagle Medium: F-12
- FBS:
-
Fetal bovine serum
- TBHP:
-
Tert-butyl hydroperoxide
- PBS:
-
Phosphate buffer saline
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- RIPA:
-
Radio immunoprecipitation assay
- PMSF:
-
Phenylmethanesulfonyl fluoride
- BCA:
-
Bicinchoninic acid
- SDS-PAGE:
-
Sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- PVDF:
-
Polyvinylidene difluoride
- TBST:
-
Tris buffered saline tween 20
- MRI:
-
Magnetic resonance imaging
- DHI:
-
Disc height index
- HE:
-
Hematoxylin–eosin
- SO&FG:
-
Safranin O-Fast Green
- DEPs:
-
Differentially expressed proteins
- CQ:
-
Chloroquine
- ECM:
-
Extracellular matrix
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This work was supported by the National Natural Science Foundation of China (Grant No. 82172480).
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JL: Conceptualization, Data curation, Formal Analysis, Validation, Writing – original draft; XZ: Investigation, Methodology, Data curation, Resources, Formal Analysis; ZX: Resources, Software, Visualization, Methodology; QX: Methodology, Investigation, Validation; YZ: Software, Formal Analysis; SJ: Data curation, Resources; ZS: Resources; DF: Formal Analysis, Methodology; CS: Resources; WL: Conceptualization, Funding acquisition, Supervision, Project administration, Writing – review & editing.
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Human samples were used in strict accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki). All animal use in this study followed the guidelines of the Peking University Animal Care and Use Committee. Ethics approval was obtained from the Biomedical Ethics Committee of Peking University (No.LA2022421).
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Lin, J., Zheng, X., Xiong, Z. et al. DJ-1-mediated p62 degradation delays intervertebral disc degeneration by inhibiting apoptosis of nucleus pulposus cells. Apoptosis 28, 1357–1371 (2023). https://doi.org/10.1007/s10495-023-01862-0
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DOI: https://doi.org/10.1007/s10495-023-01862-0