Abstract
Uveitis is an autoimmune eye disease that can be involved in the entire body and is one of the leading causes of blindness. Therefore, comprehending the mechanisms underlying the development and regulation of ocular immune responses in uveitis is crucial for designing effective therapeutic interventions. In this study, we investigated how RBPJ regulates macrophage polarization in uveitis. We demonstrated that targeted RBPJ knockdown (RBPJKD) promotes M2 macrophage polarization and ameliorates uveitis through the mtROS-mediated Notch1-Jagged1-Hes1 signaling pathway. Real-time quantitative (Q-PCR) analysis revealed that the Notch1-Jagged1-Hes1 signaling pathway was active in the eye tissues of experimental autoimmune uveitis (EAU) rats. Immunofluorescence double staining confirmed enhanced signaling primarily occurring in macrophages, establishing a correlation between the Notch1 signaling pathway and macrophages. Transmission electron microscopy evaluated the morphological and functional changes of mitochondria in each group's eye tissues. It demonstrated significant swelling and disorganization in the EAU group, which were effectively restored upon RBPJ knockdown intervention. Finally, by employing an antioxidant N-acetyl-L-cysteine (NAC) to eliminate mtROS in vivo, we observed a decrease in the M2 macrophage polarization level, which prevented the cytoprotective effect conferred by RBPJKD. These findings underscore the relevance of the Notch signaling pathway to the immune system while highlighting the potential role of mtROS as a therapeutic target for inflammation and other related diseases.
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No datasets were generated or analysed during the current study.
Abbreviations
- NC:
-
Normal control
- EAU:
-
Experimental autoimmune uveitis
- IRBP:
-
Interphotoreceptor retinoid-binding protein
- CFA:
-
Complete Freund's adjuvant
- TB:
-
Tuberculosis
- RBPJ:
-
Recombination signal binding protein-Jκ
- NICD:
-
Notch intracellular domain
- Hes1:
-
Hairy enhancer of split 1
- Q-PCR:
-
Quantitative real-time polymerase chain reaction
- Arg-1:
-
Arginase 1
- ELISA:
-
Enzyme-linked immunosorbent Assay
- IL:
-
Interleukin
- mtROS:
-
Mitochondrial reactive oxygen species
- mtDNA:
-
Mitochondrial DNA
- OXPHOS:
-
Oxidative phosphorylation
- GMFG:
-
Glial cell maturation factor-γ
- NOX4:
-
NADPH oxidase 4
- MIF:
-
Migration inhibitory factor
- NAC:
-
N-acetyl-L-cysteine
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Funding
This work was supported by the Key Project of Natural Science Foundation of Shandong Province (ZR2020KC024), the National Natural Science Foundation of China (No. 81873163), and “Taishan Scholar” Project Special Fund (tsqnz20231252).
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Q.R and G.D wrote the main manuscript. Others were responsible for date analysis. All authors reviewed the manuscript.
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The research program and experimental design were approved by the Experimental Animal Management Committee of the Affiliated Hospital of Shandong University of Traditional Chinese Medicine (Number: AWE-2022-017). All processes involving experimental animals in the experiment followed the ARVO statement on the use of animals in ophthalmic and visual studies.
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Qu, R., Peng, Y., Xu, S. et al. RBPJ Knockdown Promotes M2 Macrophage Polarization Through Mitochondrial ROS-mediated Notch1-Jagged1-Hes1 Signaling Pathway in Uveitis. Inflammation (2024). https://doi.org/10.1007/s10753-024-02053-y
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DOI: https://doi.org/10.1007/s10753-024-02053-y