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Effects of Nanosecond Pulsed Electric Field on Immune Checkpoint Receptors in Melanoma Cells
Natalia Sauer1, Wojciech Szlasa2, Anna Szewczyk3,4
1Faculty of Pharmacy, Wroclaw Medical University, 50-556 Wroclaw, Poland.
Abstract:
Checkpoint molecules such as PD-1, LAG-3, and TIM-3 are currently under extensive investigation for their roles in the attenuation of the immune response in cancer. Various methods have been applied to overcome the challenges in this field. This study investigated the effects of nanosecond pulsed electric field (nsPEF) treatment on the expression of immune checkpoint molecules in A375 and C32 melanoma cells. The researchers found that the nsPEF treatment was able to enhance membrane permeabilization and morphological changes in the cell membrane without being cytotoxic. We found that the effects of nsPEFs on melanoma included (1) the transport of vesicles from the inside to the outside of the cells, (2) cell contraction, and (3) the migration of lipids from inside the cells to their peripheries. The treatment increased the expression of PD-1 checkpoint receptors. Furthermore, we also observed potential co-localization or clustering of MHC class II and PD-1 molecules on the cell surface and the secretion of cytokines such as TNF-α and IL-6. These findings suggest that nsPEF treatment could be a viable approach to enhance the delivery of therapeutic agents to cancer cells and to modulate the tumor microenvironment to promote an antitumor immune response. Further studies are needed to explore the mechanisms underlying these effects and their impacts on the antitumor immune response, and to investigate the potential of nsPEF treatment in combination with immune checkpoint inhibitors to improve clinical outcomes for cancer patients.
Insights
Nanosecond pulsed electric field (nsPEF) treatment non-cytotoxically alters melanoma cells, increasing immune checkpoint PD-1 expression and cytokine release. This suggests nsPEF therapy may enhance cancer treatment delivery and immune response.
Area of Science:
- Cancer immunotherapy
- Electroporation
- Tumor microenvironment modulation
Background:
- Immune checkpoints like PD-1, LAG-3, and TIM-3 are crucial in cancer immune evasion.
- Developing strategies to overcome immune suppression in cancer is a major research focus.
- Nanosecond pulsed electric fields (nsPEFs) are explored for their potential in cancer therapy.
Purpose of the Study:
- To investigate the impact of nsPEF treatment on immune checkpoint molecule expression in melanoma cells.
- To evaluate the effects of nsPEF on melanoma cell membrane permeability and morphology.
- To explore the potential of nsPEF in modulating the tumor microenvironment for enhanced immunotherapy.
Main Methods:
- Treatment of A375 and C32 melanoma cell lines with nsPEFs.
- Assessment of cell membrane permeabilization, morphological changes, and cytotoxicity.
- Analysis of immune checkpoint molecule expression (e.g., PD-1) via cell surface and cytokine secretion.
- Investigation of MHC class II and PD-1 molecule co-localization.
Main Results:
- nsPEF treatment enhanced membrane permeabilization and induced morphological changes without cytotoxicity.
- Observed effects included vesicle transport, cell contraction, and peripheral lipid migration.
- Increased expression of PD-1 checkpoint receptors was noted.
- Co-localization of MHC class II and PD-1 molecules and secretion of TNF-α and IL-6 were detected.
Conclusions:
- nsPEF treatment shows potential for enhancing therapeutic agent delivery to cancer cells.
- The treatment can modulate the tumor microenvironment, potentially promoting an antitumor immune response.
- Further research is warranted to elucidate mechanisms and explore nsPEF in combination therapies for improved clinical outcomes.
