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Updated: Dec 5, 2025

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
Subversion of Ras Small GTPases in Cutaneous Melanoma Aggressiveness
Cheila Brito1, Duarte C Barral2, Marta Pojo1
1Unidade de Investigação em Patobiologia Molecular (UIPM) do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Lisbon, Portugal.
Abstract:
The rising incidence and mortality rate associated with the metastatic ability of cutaneous melanoma represent a major public health concern. Cutaneous melanoma is one of the most invasive human cancers, but the molecular mechanisms are poorly understood. Moreover, currently available therapies are not efficient in avoiding melanoma lethality. In this context, new biomarkers of prognosis, metastasis, and response to therapy are necessary to better predict the disease outcome. Additionally, the knowledge about the molecular alterations and dysregulated pathways involved in melanoma metastasis may provide new therapeutic targets. Members of the Ras superfamily of small GTPases regulate various essential cellular activities, from signaling to membrane traffic and cytoskeleton dynamics. Therefore, it is not surprising that they are differentially expressed, and their functions subverted in several types of cancer, including melanoma. Indeed, Ras small GTPases were found to regulate melanoma progression and invasion. Hence, a better understanding of the mechanisms regulated by Ras small GTPases that are involved in melanoma tumorigenesis and progression may provide new therapeutic strategies to block these processes. Here, we review the current knowledge on the role of Ras small GTPases in melanoma aggressiveness and the molecular mechanisms involved. Furthermore, we summarize the known involvement of these proteins in melanoma metastasis and how these players influence the response to therapy.
Insights
Ras small GTPases are crucial in melanoma progression and metastasis. Understanding their molecular mechanisms offers potential new therapeutic targets for this aggressive skin cancer.
Area of Science:
- Oncology
- Molecular Biology
- Dermatology
Background:
- Cutaneous melanoma presents a significant public health challenge due to increasing incidence and mortality.
- The molecular underpinnings of melanoma metastasis remain poorly understood, limiting therapeutic efficacy.
- There is a critical need for novel biomarkers for prognosis, metastasis, and treatment response in melanoma.
Purpose of the Study:
- To review the current understanding of Ras small GTPases' role in melanoma aggressiveness.
- To elucidate the molecular mechanisms by which Ras small GTPases contribute to melanoma progression and metastasis.
- To summarize the influence of Ras small GTPases on melanoma metastasis and response to therapy.
Main Methods:
- Literature review of studies on Ras small GTPases in melanoma.
- Analysis of molecular mechanisms regulating melanoma tumorigenesis and progression.
- Synthesis of data on the involvement of Ras small GTPases in melanoma metastasis and therapy response.
Main Results:
- Ras small GTPases are differentially expressed and their functions are subverted in melanoma.
- These proteins play a significant role in regulating melanoma cell signaling, invasion, and cytoskeleton dynamics.
- Dysregulation of Ras small GTPases is implicated in melanoma aggressiveness and metastatic potential.
Conclusions:
- Ras small GTPases are key regulators of melanoma progression, invasion, and metastasis.
- Targeting Ras small GTPase pathways may offer novel therapeutic strategies to combat melanoma.
- Further research into these molecular players is essential for improving melanoma patient outcomes.
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