GRK5 promotes tumor progression in renal cell carcinoma
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Updated: Jan 28, 2026
Microfluidic Co-culture of Renal Healthy and Tumor Epithelium to Model Kidney Cancer Progression
Published on: January 31, 2025
1Department of Urology, Changzheng Hospital, The Second Military Medical University, Shanghai, China.
Abstract:
GRK5 is a multifunctional protein that is able to move within the cell in response to various stimuli to regulate key intracellular signaling from receptor activation, on plasmamembrane, to gene transcription, in the nucleus. Thus, GRK5 is involved in the development and progression of several pathological conditions including cancer. Here, we report an important tumor-promoting role for GRK5 in renal cell carcinoma (RCC). We investigated the expression pattern, clinical significance, and function of GRK5 in RCC. By using quantitative real-time polymerase chain reaction (qRT-PCR) and tissue microarray (TMA) immunohistochemistry (IHC), we first demonstrated that compared with paired adjacent nontumor (NT) tissues, RCC tissues presented with higher GRK5 expression. Moreover, we found that GRK5 upregulation was associated with poor clinical outcomes in RCC patients. In vitro, we found that GRK5 knockdown reduced viability, invasive ability, migratory ability, and decreased proportion of cells in S phase, with concomitant increase in G1 phase in RCC cell lines, while GRK5 overexpression promoted tumor cell proliferation, cell invasion, migration and increased proportion of cells in S phase, with concomitant decrease in G1 phase. Collectively, our findings describe the tumour-promoting role of GRK5 in RCC and thus provide molecular evidence for new therapeutic options in RCC.
Insights
G protein-coupled receptor kinase 5 (GRK5) promotes renal cell carcinoma (RCC) development. Higher GRK5 expression correlates with poor patient outcomes, suggesting GRK5 as a therapeutic target in RCC.
Area of Science:
- Molecular Biology
- Oncology
- Cell Biology
Background:
- G protein-coupled receptor kinase 5 (GRK5) is a multifunctional protein involved in intracellular signaling pathways.
- GRK5's role in various pathological conditions, including cancer, highlights its potential significance in disease progression.
Purpose of the Study:
- To investigate the expression pattern, clinical significance, and functional role of GRK5 in renal cell carcinoma (RCC).
- To elucidate the tumor-promoting functions of GRK5 in RCC and its potential as a therapeutic target.
Main Methods:
- Quantitative real-time polymerase chain reaction (qRT-PCR) to assess GRK5 mRNA expression.
- Tissue microarray (TMA) immunohistochemistry (IHC) to evaluate GRK5 protein levels in RCC tissues and adjacent non-tumor (NT) tissues.
- In vitro studies involving GRK5 knockdown and overexpression in RCC cell lines to analyze effects on cell viability, invasion, migration, and cell cycle progression.
Main Results:
- GRK5 expression was significantly higher in RCC tissues compared to adjacent non-tumor tissues.
- Upregulated GRK5 expression was associated with poorer clinical outcomes in RCC patients.
- GRK5 knockdown reduced RCC cell viability, invasion, and migration, while GRK5 overexpression promoted these processes and altered cell cycle distribution.
Conclusions:
- GRK5 plays a significant tumor-promoting role in renal cell carcinoma.
- GRK5 upregulation is linked to adverse clinical outcomes in RCC patients.
- These findings provide molecular evidence supporting GRK5 as a potential therapeutic target for RCC.
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