Related Experiment Video
Updated: Jan 9, 2026
RhoC GTPase Activation Assay
Published on: August 22, 2010
GNAQ inhibits tumorigenesis via the ARHGEF25-mediated RHOA pathway in NK/T-cell lymphoma
Yuyang Gao1,2, Zihe Zhang1,2, Yue Song1
1Department of Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, People's Republic of China.
Background:
Natural killer/T-cell lymphoma (NKTCL) presents highly aggressive clinical behaviour, and the outcomes for relapsed and refractory patients are still poor. Our previous study identified somatic mutations in GNAQ in 8.7% of cases through whole-exome sequencing, revealing the T96S mutation in the Gαq protein.
Materials:
The proliferation, gemcitabine sensitivity and apoptosis of NKTCL cells were assessed by CCK-8 assays and flow cytometry. The downstream pathways of GNAQ were explored by mRNA sequencing, Western blotting and co‑immunoprecipitation. Additionally, we investigated the role of GNAQ in the activation of the RHOA pathway in NKTCL.
Results:
We found that GNAQ significantly inhibited the aggressive function of NKTCL, whereas the T96S mutation abolished the ability of wild-type GNAQ to trigger cell apoptosis. Further investigation revealed that GNAQ modulated NKTCL cell functions through the activation of the RHOA pathway, which is regulated by the GNAQ-ARHGEF25 complex. Clinically, high expression of RHOA was associated with improved overall survival (HR = 0.317, 95% CI: 0.126-0.800, p = 0.015), whereas low expression of RHOA was correlated with poorer survival outcomes. The application of an RHOA pathway inhibitor or reactivation of the RHOA pathway significantly affected the biological functions of NKTCL cells both in vitro and in vivo.
Conclusion:
In summary, RHOA is a critical downstream effector of GNAQ in NKTCL. GNAQ promotes RHOA activation through ARHGEF25, which in turn regulates cellular functions by modulating cell proliferation and apoptosis, thereby influencing the progression of NKTCL.
Insights
Natural killer/T-cell lymphoma (NKTCL) progression is influenced by the GNAQ gene. GNAQ activates the RHOA pathway, impacting cell proliferation and apoptosis, offering potential therapeutic targets for NKTCL.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Natural killer/T-cell lymphoma (NKTCL) is an aggressive malignancy with poor outcomes for relapsed/refractory patients.
- Previous research identified somatic mutations in GNAQ, including T96S, in NKTCL cases.
Purpose of the Study:
- To investigate the role of GNAQ and its downstream pathways in NKTCL.
- To explore the functional impact of GNAQ mutations on NKTCL cell behavior.
- To determine the clinical relevance of the RHOA pathway in NKTCL.
Main Methods:
- Cell proliferation, apoptosis, and gemcitabine sensitivity assays (CCK-8, flow cytometry).
- Gene expression analysis (mRNA sequencing, Western blotting).
- Protein interaction studies (co-immunoprecipitation).
- In vitro and in vivo functional assays with pathway inhibitors.
Main Results:
- GNAQ inhibited aggressive NKTCL functions; the T96S mutation abrogated GNAQ's pro-apoptotic effect.
- GNAQ activates the RHOA pathway via the GNAQ-ARHGEF25 complex, modulating NKTCL cell functions.
- High RHOA expression correlated with improved overall survival in NKTCL patients.
- Modulating the RHOA pathway significantly impacted NKTCL cell behavior in vitro and in vivo.
Conclusions:
- RHOA is a critical downstream effector of GNAQ in NKTCL.
- GNAQ-ARHGEF25 complex promotes RHOA activation, regulating NKTCL cell proliferation and apoptosis.
- Targeting the RHOA pathway presents a potential therapeutic strategy for NKTCL.
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