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Comparing Metastatic Clear Cell Renal Cell Carcinoma Model Established in Mouse Kidney and on Chicken Chorioallantoic Membrane
Published on: February 8, 2020
The Hippo pathway in clear cell renal cell carcinoma (ccRCC): a nexus with the VHL disruption?
T Waeckel1, R Lefranc1, M Waeckel2
1Université de Caen Normandie, CNRS, Normandie Univ, ISTCT UMR6030, CYCERON, F-14000 Caen, France; Centre Hospitalier Universitaire de Caen Normandie, Service d'Urologie et Transplantation, 14000 CAEN, France.
Background:
Clear cell renal cell carcinoma (ccRCC) represents 70% of kidney cancers, with 20-50% recurrence risk after surgery. Despite therapeutic advances, no reliable biomarkers have been identified for patient stratification or treatment response prediction. While VHL gene alterations are well-established in ccRCC pathogenesis, the role of the Hippo pathway remains underexplored despite ample evidence of its involvement.
Objective:
This review synthesizes current knowledge on Hippo pathway alterations in ccRCC and examines its crosstalk with the VHL/HIF axis, identifying potential biomarkers and therapeutic targets.
Strategy:
We comprehensively analyzed literature on Hippo pathway components in ccRCC, focusing on molecular mechanisms, clinical correlations, and interactions with VHL signaling.
Results:
Multiple Hippo pathway alterations characterize ccRCC: RASSF1A hypermethylation, NF2 mutations (particularly in aggressive variants), SAV1 downregulation associated with 14q loss, and LATS1/2 methylation-mediated inactivation. These changes result in YAP/TAZ nuclear accumulation and oncogenic transcription. Importantly, chromosome 3p loss simultaneously disrupts both VHL and RASSF1, creating a unique double-hit scenario. The VHL-Hippo crosstalk operates through multiple mechanisms: HIF-induced GPRC5A and VEGFR signaling inhibit LATS1/2 phosphorylation, promoting YAP/TAZ activation, while active YAP/TAZ enhances pro-angiogenic gene transcription, amplifying hypoxic responses. Low expression of RASSF1A, SAV1, and LATS1/2, coupled with high YAP/TAZ activity, correlates with advanced tumor stage, higher grade, and poorer survival.
Conclusions:
The Hippo pathway represents a critical yet underappreciated dimension of ccRCC biology, offering promising biomarkers for risk stratification and novel therapeutic targets. The Hippo-VHL nexus presents multiple intervention points that could enhance current treatment.
Insights
The Hippo pathway is altered in clear cell renal cell carcinoma (ccRCC), impacting tumor progression and survival. Targeting the Hippo-VHL axis offers new biomarkers and therapies for ccRCC patients.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Clear cell renal cell carcinoma (ccRCC) has a high recurrence rate, lacking reliable biomarkers for patient stratification.
- While VHL gene alterations are known drivers, the Hippo pathway's role in ccRCC is underexplored.
Purpose of the Study:
- To review Hippo pathway alterations in ccRCC.
- To examine Hippo pathway crosstalk with the VHL/HIF axis.
- To identify potential ccRCC biomarkers and therapeutic targets.
Main Methods:
- Comprehensive literature analysis of Hippo pathway components in ccRCC.
- Focus on molecular mechanisms, clinical correlations, and VHL signaling interactions.
Main Results:
- Hippo pathway alterations (RASSF1A hypermethylation, NF2 mutations, SAV1 downregulation, LATS1/2 inactivation) lead to YAP/TAZ activation in ccRCC.
- Simultaneous 3p loss affects both VHL and RASSF1, creating a double-hit scenario.
- VHL-Hippo crosstalk involves HIF-induced signaling inhibiting LATS1/2 and YAP/TAZ promoting angiogenesis; low RASSF1A/SAV1/LATS1/2 and high YAP/TAZ correlate with poor prognosis.
Conclusions:
- The Hippo pathway is a critical, underappreciated factor in ccRCC biology.
- Hippo pathway alterations offer promising biomarkers for ccRCC risk stratification.
- The Hippo-VHL nexus provides novel therapeutic intervention points for ccRCC.
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