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p53 targets TSPAN8 to prevent invasion in melanoma cells
G Agaësse1,2,3, L Barbollat-Boutrand1,2,3, M El Kharbili1,2,3
1Université de Lyon, Lyon, France.
Abstract:
Cutaneous melanoma is a very deadly cancer because of its proclivity to metastasize. Despite the recent development of targeted and immune therapies, patient survival remains low. It is therefore crucial to enhance understanding of the molecular mechanisms underlying invasion. We previously identified tetraspanin 8 (TSPAN8) as an important modulator of melanoma invasiveness, and several of its transcriptional regulators, which affect TSPAN8 expression during melanoma progression toward an invasive stage. This study found that TSPAN8 promoter contains consensus-binding sites for p53 transcription factor. We demonstrated that p53 silencing was sufficient to turn on Tspan8 expression in non-invasive melanoma cells and that p53 acts as a direct transcriptional repressor of TSPAN8. We also showed that p53 modulated matrigel invasion in melanoma cells in a TSPAN8-dependent manner. In conclusion, this study reveals p53 as a negative regulator of Tspan8 expression. As TP53 gene is rarely mutated in melanoma, it was hitherto poorly studied but its role in apoptosis and growth suppression in melanoma is increasingly becoming clear. The study highlights the importance of p53 as a regulator of melanoma invasion and the concept that reactivating p53 could provide a strategy for modulating not only proliferative but also invasive capacity in melanoma treatment.
Insights
The tumor suppressor p53 directly represses the expression of tetraspanin 8 (TSPAN8), a protein promoting melanoma cell invasion. Reactivating p53 may offer a new strategy to control melanoma spread.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Cutaneous melanoma is a deadly cancer with high metastatic potential.
- Current therapies offer limited survival benefits, necessitating deeper understanding of invasion mechanisms.
- Tetraspanin 8 (TSPAN8) is identified as a key modulator of melanoma invasiveness.
Purpose of the Study:
- To investigate the regulatory relationship between p53 and TSPAN8 in melanoma.
- To determine if p53 influences melanoma cell invasion through TSPAN8.
Main Methods:
- Analysis of TSPAN8 promoter for p53 binding sites.
- p53 silencing experiments in non-invasive melanoma cells.
- Assessment of melanoma cell invasion using matrigel assays.
Main Results:
- The TSPAN8 promoter contains consensus-binding sites for the p53 transcription factor.
- p53 acts as a direct transcriptional repressor of TSPAN8 expression.
- p53 modulates melanoma cell invasion in a TSPAN8-dependent manner.
Conclusions:
- p53 is a novel negative regulator of TSPAN8 expression in melanoma.
- The TP53 gene, rarely mutated in melanoma, plays a significant role in regulating invasion.
- Reactivating p53 presents a potential therapeutic strategy to inhibit both proliferation and invasion in melanoma.