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An Aggressive Hypoxia Related Subpopulation of Melanoma Cells is TRP-2 Negative
Daniela Lenggenhager1, Alessandra Curioni-Fontecedro2, Martina Storz1
1Institute of Surgical Pathology, University Hospital, Zurich, Switzerland.
Abstract:
Despite existing vaccination strategies targeting TRP-2, its function is not yet fully understood. TRP-2 is an enzyme involved in melanin biosynthesis and therefore discussed as a differentiation antigen. However, in mice Trp-2 was shown to be expressed in melanocyte stem cells of the hair follicle and therefore also considered as an indicator of stemness. A proper understanding of the TRP-2 function is crucial, considering a vaccination targeting cells with stemness properties would be highly effective in contrast to a therapy targeting differentiated melanoma cells. Analysing over 200 melanomas including primaries, partly matched metastases and patients' cell cultures we show that TRP-2 is correlated with Melan A expression and decreases with tumor progression. In mice it is expressed in differentiated melanocytes as well as in stem cells. Furthermore, we identify a TRP-2 negative, proliferative, hypoxia related cell subpopulation which is significantly associated with tumor thickness and diseases progression. Patients with a higher percentage of those cells have a less favourable tumor specific survival. Our findings underline that TRP-2 is a differentiation antigen, highlighting the importance to combine TRP-2 vaccination with other strategies targeting the aggressive undifferentiated hypoxia related subpopulation.
Insights
TRP-2 is a differentiation antigen in melanoma, decreasing with tumor progression. A TRP-2 negative subpopulation correlates with aggressive disease, suggesting combined vaccination strategies are needed.
Area of Science:
- Oncology
- Dermatology
- Cell Biology
Background:
- Tyrosinase-related protein 2 (TRP-2) is implicated in melanin synthesis and considered a differentiation antigen.
- TRP-2 expression in mouse melanocyte stem cells suggests a role in stemness, relevant for cancer vaccination strategies.
- Understanding TRP-2's precise function is critical for developing effective melanoma therapies targeting either stem cells or differentiated cells.
Purpose of the Study:
- To investigate the role and function of TRP-2 in melanoma.
- To identify TRP-2 expression patterns in relation to tumor progression and patient survival.
- To explore potential therapeutic strategies involving TRP-2.
Main Methods:
- Analysis of TRP-2 expression in over 200 melanomas (primaries, metastases, cell cultures).
- Correlation analysis of TRP-2 with Melan A expression and tumor progression markers.
- Identification and characterization of TRP-2 negative cell subpopulations.
Main Results:
- TRP-2 expression correlates with Melan A and diminishes during tumor progression.
- TRP-2 is expressed in both differentiated melanocytes and stem cells in mice.
- A TRP-2 negative, proliferative, hypoxia-related subpopulation is linked to increased tumor thickness, disease progression, and reduced survival.
Conclusions:
- TRP-2 functions as a differentiation antigen in melanoma.
- The identified TRP-2 negative subpopulation represents an aggressive, undifferentiated cell type associated with poor prognosis.
- Combined therapeutic approaches, including TRP-2 vaccination and targeting the aggressive subpopulation, are warranted for improved melanoma treatment.
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