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Blocking interleukin-6 trans-signaling protects against renal fibrosis by suppressing STAT3 activation
Wei Chen1, Hui Yuan1, Wenmin Cao1
1Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of Urology, Nanjing University, Nanjing, Jiangsu, China.
Abstract:
Rationale: Renal fibrosis is the terminal manifestation of chronic and irreversible renal disease. Effective therapies other than dialysis are extremely limited. In this study, we investigated the potential effects of targeting elevated interleukin-6 (IL-6) levels in the treatment of renal fibrosis. Methods: Fc-gp130 was used to specifically block IL-6 trans-signaling. Unilateral ureteral occlusion (UUO) and ischemia reperfusion (IR) mouse models were constructed to investigate the therapeutic effect of Fc-gp130 on renal fibrosis. The role of IL-6 trans-signaling and phosphorylation of signal transducer and activator of transcription (STAT) 3 in regulating fibroblast accumulation and extracellular matrix protein deposition were evaluated in cell experiments and mouse models. Results: The kidneys of mice with UUO were found to have elevated soluble IL-6 receptor (sIL-6R) levels in the progression of fibrosis. Fc-gp130 attenuated renal fibrosis in mice, as evidenced by reductions in tubular atrophy and the production of extracellular matrix protein. Blockade of IL-6 trans-signaling with Fc-gp130 also reduced inflammation levels, immune cell infiltration, and profibrotic cytokines expression in renal tissue, with decreased STAT3 phosphorylation and reduced fibroblast accumulation in the renal tissue. In vitro, Fc-gp130 also reduced the phosphorylation of STAT3 induced by transforming growth factor (TGF)-β1 in fibroblasts. Furthermore, the therapeutic effect of Fc-gp130 was confirmed in a model of acute kidney injury-chronic kidney disease. Conclusion: Overall, IL-6 trans-signaling may contribute to crucial events in the development of renal fibrosis, and the targeting of IL-6 trans-signaling by Fc-gp130 may provide a novel therapeutic strategy for the treatment of renal fibrosis.
Insights
Targeting interleukin-6 (IL-6) trans-signaling with Fc-gp130 effectively reduced renal fibrosis in mouse models. This approach offers a promising new therapeutic strategy for kidney disease by inhibiting key fibrotic pathways.
Area of Science:
- Nephrology
- Immunology
- Molecular Biology
Background:
- Renal fibrosis is an irreversible consequence of chronic kidney disease with limited treatment options.
- Elevated interleukin-6 (IL-6) signaling is implicated in the progression of renal fibrosis.
Purpose of the Study:
- To investigate the therapeutic potential of blocking IL-6 trans-signaling in renal fibrosis.
- To evaluate the efficacy of Fc-gp130, an IL-6 trans-signaling inhibitor, in preclinical models of kidney fibrosis.
Main Methods:
- Utilized unilateral ureteral occlusion (UUO) and ischemia-reperfusion (IR) mouse models to induce renal fibrosis.
- Administered Fc-gp130 to block IL-6 trans-signaling and assessed its impact on fibrotic markers, inflammation, and cellular signaling.
- Conducted in vitro experiments using fibroblasts to elucidate the mechanism of action.
Main Results:
- Fc-gp130 treatment significantly attenuated renal fibrosis, reducing tubular atrophy and extracellular matrix deposition in UUO and IR models.
- Blockade of IL-6 trans-signaling decreased inflammation, immune cell infiltration, and STAT3 phosphorylation, a key mediator of fibrosis.
- Fc-gp130 inhibited TGF-β1-induced STAT3 phosphorylation in fibroblasts, demonstrating a direct cellular effect.
Conclusions:
- IL-6 trans-signaling plays a critical role in the pathogenesis of renal fibrosis.
- Targeting IL-6 trans-signaling with Fc-gp130 represents a novel and effective therapeutic strategy for treating renal fibrosis and related kidney diseases.
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