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IFI35 Promotes Renal Cancer Progression by Inhibiting pSTAT1/pSTAT6-Dependent Autophagy
Dafei Chai1,2,3,4, Shang Yuchen Shi5, Navid Sobhani4
1Cancer Institute, Xuzhou Medical University, Xuzhou 221002, China.
Abstract:
Interferon-induced protein 35 (IFI35), is currently acknowledged to govern the virus-related immune inflammatory responses. However, the biological significance and function of IFI35 in renal cell cancer (RCC) is still not well understood. Here, IFI35 expression and function were investigated in RCC tissues, renal cancer cells, and animal models. The results showed that IFI35 expression was significantly increased in 200 specimens of RCC patients. We found that higher IFI35 levels were significantly correlated with poor RCC prognosis. In human cell lines, the knockdown of IFI35 suppressed the malignant behavior of renal cancer cells. Similarly, the IFI35 knockdown resulted in significant inhibition of tumor progression in the subcutaneous or lung metastasis mouse model. Furthermore, the knockdown of IFI35 promoted the induction of autophagy by enhancing the autophagy-related gene expression (LC3-II, Beclin-1, and ATG-5). Additionally, blockade of STAT1/STAT6 phosphorylation (pSTAT1/pSTAT6) abrogated the induced autophagy by IFI35 knockdown in renal cancer cells. The autophagy inhibitor 3-MA also abolished the prevention of tumor growth by deleting IFI35 in renal cancer models. The above results suggest that the knockdown of IFI35 suppressed tumor progression of renal cancer by pSTAT1/pSTAT6-dependent autophagy. Our research revealed that IFI35 may serve as a potential diagnosis and therapeutic target for RCC.
Insights
Interferon-induced protein 35 (IFI35) is elevated in renal cell cancer (RCC), promoting tumor growth. Reducing IFI35 inhibits RCC progression by activating autophagy via the pSTAT1/pSTAT6 pathway, suggesting IFI35 as a therapeutic target.
Area of Science:
- Oncology
- Immunology
- Molecular Biology
Background:
- Interferon-induced protein 35 (IFI35) regulates antiviral immune responses.
- The role of IFI35 in renal cell cancer (RCC) pathogenesis is not well understood.
Purpose of the Study:
- To investigate the expression, function, and therapeutic potential of IFI35 in RCC.
- To elucidate the molecular mechanisms underlying IFI35's role in RCC progression.
Main Methods:
- Analysis of IFI35 expression in RCC tissues and cell lines.
- In vitro and in vivo studies involving IFI35 knockdown in RCC models.
- Investigation of autophagy induction and STAT1/STAT6 signaling pathways.
Main Results:
- IFI35 expression is significantly upregulated in RCC tissues and correlates with poor prognosis.
- IFI35 knockdown suppresses RCC cell proliferation, migration, and metastasis in vitro and in vivo.
- IFI35 knockdown induces autophagy via enhanced expression of autophagy-related genes (LC3-II, Beclin-1, ATG-5).
- The tumor-suppressive effects of IFI35 knockdown are mediated by pSTAT1/pSTAT6-dependent autophagy.
Conclusions:
- IFI35 promotes RCC progression through pSTAT1/pSTAT6-dependent autophagy.
- IFI35 represents a potential diagnostic biomarker and therapeutic target for renal cell cancer.
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