Clinical Importance of Cannabinoid Type 1 Receptor (CB1R) and Cannabinoid Type 2 Receptor (CB2R) Expression in Renal Cell Carcinoma
Dimitrios Deligiannis1, Ioannis Anastasiou2, Dionysios Mitropoulos2
1Department of Urology, Naval Hospital of Athens, Athens, GRC.
Cureus
|February 29, 2024
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View abstract on PubMed
Summary
Cannabinoid type 2 receptor (CB2R) is highly expressed in most renal cell carcinomas (RCCs), unlike cannabinoid type 1 receptor (CB1R). Enhanced CB2R expression correlates with specific clinicopathological aspects, suggesting its potential as a prognostic marker or therapeutic target in RCC.
Area of Science:
- Oncology
- Molecular Biology
- Immunohistochemistry
Background:
- Cannabinoid receptors, specifically CB1R and CB2R, play roles in various physiological processes.
- Their expression and function in renal cell carcinoma (RCC) are not fully understood.
- Investigating these receptors may reveal new insights into RCC pathogenesis and treatment.
Purpose of the Study:
- To evaluate the expression of CB1R and CB2R in RCC tissues.
- To correlate receptor expression with clinicopathological features of RCC patients.
- To explore the potential of CB1R and CB2R as biomarkers or therapeutic targets in RCC.
Main Methods:
- Retrospective analysis of 87 RCC patient specimens.
- Immunohistochemical assessment of CB1R and CB2R expression (positivity, intensity, percentage, distribution, score).
- Statistical analysis including unifactorial and multifactorial correlations with clinicopathological parameters.
Main Results:
- CB1R was not expressed in any RCC samples.
- CB2R was highly expressed in 89.7% of RCC patients.
- Multifactorial analysis revealed associations between CB2R expression and papillary/clear-cell histology, T2 stage, male gender, and chromophobe histology.
Conclusions:
- CB1R is absent in RCC, while CB2R is ubiquitously expressed.
- Enhanced CB2R expression correlates with specific clinicopathological characteristics in RCC.
- CB2R holds promise as a potential prognostic marker and therapeutic target for RCC.
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