Synthetic Peptide ΔM4-Induced Cell Death Associated with Cytoplasmic Membrane Disruption, Mitochondrial Dysfunction
Gloria A Santa-González1, Edwin Patiño-González1, Marcela Manrique-Moreno1
1Structural Biochemistry of Macromolecules Group, Chemistry Institute, Faculty of Exact and Natural Sciences, University of Antioquia, Medellin A.A. 1226, Colombia.
Abstract:
Melanoma is the most dangerous and lethal form of skin cancer, due to its ability to spread to different organs if it is not treated at an early stage. Conventional chemotherapeutics are failing as a result of drug resistance and weak tumor selectivity. Therefore, efforts to evaluate novel molecules for the treatment of skin cancer are necessary. Antimicrobial peptides have become attractive anticancer agents because they execute their biological activity with features such as a high potency of action, a wide range of targets, and high target specificity and selectivity. In the present study, the antiproliferative activity of the synthetic peptide ΔM4 on A375 human melanoma cells and spontaneously immortalized HaCaT human keratinocytes was investigated. The cytotoxic effect of ΔM4 treatment was evaluated through propidium iodide uptake by flow cytometry. The results indicated selective toxicity in A375 cells and, in order to further investigate the mode of action, assays were carried out to evaluate morphological changes, mitochondrial function, and cell cycle progression. The findings indicated that ΔM4 exerts its antitumoral effects by multitarget action, causing cell membrane disruption, a change in the mitochondrial transmembrane potential, an increase of reactive oxygen species, and cell cycle accumulation in S-phase. Further exploration of the peptide may be helpful in the design of novel anticancer peptides.
Insights
A novel synthetic peptide, ΔM4, shows selective toxicity against melanoma cells. This peptide disrupts cell membranes and alters mitochondrial function, offering potential for new skin cancer treatments.
Area of Science:
- Oncology
- Biochemistry
- Dermatology
Background:
- Melanoma is a lethal skin cancer with limited treatment options due to drug resistance.
- Conventional therapies lack tumor selectivity, necessitating novel therapeutic agents.
- Antimicrobial peptides show promise as anticancer agents due to their potency and specificity.
Purpose of the Study:
- To investigate the antiproliferative and cytotoxic effects of the synthetic peptide ΔM4.
- To evaluate the selective toxicity of ΔM4 on A375 human melanoma cells versus HaCaT keratinocytes.
- To elucidate the mechanism of action of ΔM4 in melanoma cells.
Main Methods:
- Antiproliferative activity assessed on A375 melanoma and HaCaT keratinocyte cell lines.
- Cytotoxicity evaluated using propidium iodide uptake via flow cytometry.
- Mechanism of action explored through morphological changes, mitochondrial function assays, and cell cycle analysis.
Main Results:
- ΔM4 demonstrated selective toxicity against A375 human melanoma cells.
- The peptide induced cell membrane disruption and altered mitochondrial membrane potential.
- ΔM4 caused an increase in reactive oxygen species and S-phase cell cycle arrest.
Conclusions:
- The synthetic peptide ΔM4 exhibits potent antitumoral effects through multi-target action.
- ΔM4's mechanism involves membrane disruption, mitochondrial dysfunction, and cell cycle arrest.
- Further research into ΔM4 could facilitate the development of novel anticancer peptides for melanoma treatment.
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