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Detection and Isolation of Circulating Melanoma Cells using Photoacoustic Flowmetry
Published on: November 25, 2011
Melanoma Cell Death Mechanisms
Lindsey Broussard1,2, Amanda Howland1, Sunhyo Ryu1
1Department of Dermatology, University of Colorado Denver School of Medicine, Aurora, CO, USA.
Abstract:
Over recent years, several new molecular and immunogenic therapeutic approaches to melanoma treatment have been approved and implemented in clinical practice. Mechanisms of resistance to these new therapies have become a major problem. Mutation-specific pharmacotherapy can result in simultaneous emergence of resistant clones at many separate body sites despite an initially positive therapeutic response. Additionally, treatments aimed at inducing apoptosis are subject to resistance due to escape through other known mechanisms of regulated cell death (RCD). In this review, we discuss the complexity in pharmacological manipulation of melanoma with c-Kit, BRAF, MEK, and/or mTOR mutant cell lines. This study also addresses melanoma evasion of cell death through modalities of RCD such as apoptosis, autophagy, and necroptosis. This study also examines new combination therapies which have been approved to target both cell cycle dysregulation and cell death pathways. Lastly, we recognize the importance of immunomodulation though manipulation of the body's natural killing mechanisms with CTLA4, PD1, and CSF1 inhibition. As we begin to recognize tumor cell activation of alternate pathways, evasion of programmed cell death, and manipulation of the tumor microenvironment, it is increasingly important to grasp the complexity of personalized therapy in melanoma treatment.
Insights
New melanoma treatments face resistance challenges. This review explores how melanoma cells evade apoptosis and other cell death pathways, highlighting the need for complex, personalized combination therapies and immunomodulation for effective treatment.
Area of Science:
- Oncology
- Dermatology
- Pharmacology
Background:
- Recent advances in melanoma treatment include novel molecular and immunogenic therapies.
- Therapeutic resistance is a significant challenge, with resistant clones emerging at multiple sites.
- Melanoma cells can evade apoptosis through alternative regulated cell death (RCD) mechanisms.
Purpose of the Study:
- To review the complexities of pharmacological manipulation in melanoma targeting specific mutations (c-Kit, BRAF, MEK, mTOR).
- To discuss melanoma's evasion strategies across various RCD modalities like apoptosis, autophagy, and necroptosis.
- To examine emerging combination therapies and immunomodulatory approaches for melanoma.
Main Methods:
- Literature review of molecular and immunogenic therapies for melanoma.
- Analysis of resistance mechanisms to targeted and apoptosis-inducing treatments.
- Examination of RCD pathways and their role in melanoma evasion.
- Review of combination therapies and immunomodulation strategies (CTLA4, PD1, CSF1 inhibition).
Main Results:
- Melanoma exhibits complex resistance to mutation-specific pharmacotherapy and apoptosis-inducing treatments.
- Tumor cells activate alternative pathways and evade programmed cell death.
- Combination therapies targeting cell cycle and cell death pathways show promise.
- Immunomodulation through immune checkpoint inhibitors is crucial.
Conclusions:
- Understanding melanoma's multifaceted resistance mechanisms is vital for effective treatment.
- Personalized therapeutic strategies incorporating combination therapies and immunomodulation are essential.
- Targeting both tumor cell vulnerabilities and the tumor microenvironment is key to overcoming resistance.
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