title: Cold atmospheric plasma treatment selectively targets head and neck squamous cell carcinoma cells.
abstract: The treatment of locoregional recurrence (LRR) of head and neck squamous cell carcinoma (HNSCC) often requires a combination of surgery, radiation therapy and/or chemotherapy. Survival outcomes are poor and the treatment outcomes are morbid. Cold atmospheric plasma (CAP) is an ionized gas produced at room temperature under laboratory conditions. We have previously demonstrated that treatment with a CAP jet device selectively targets cancer cells using in vitro melanoma and in vivo bladder cancer models. In the present study, we wished to examine CAP selectivity in HNSCC in vitro models, and to explore its potential for use as a minimally invasive surgical approach that allows for specific cancer cell or tumor tissue ablation without affecting the surrounding healthy cells and tissues. Four HNSCC cell lines (JHU-022, JHU-028, JHU-029, SCC25) and 2 normal oral cavity epithelial cell lines (OKF6 and NOKsi) were subjected to cold plasma treatment for durations of 10, 30 and 45 sec, and a helium flow of 20 l/min-1 for 10 sec was used as a positive treatment control. We showed that cold plasma selectively diminished HNSCC cell viability in a dose-response manner, as evidenced by MTT assays; the viability of the OKF6 cells was not affected by the cold plasma. The results of colony formation assays also revealed a cell-specific response to cold plasma application. Western blot analysis did not provide evidence that the cleavage of PARP occurred following cold plasma treatment. In conclusion, our results suggest that cold plasma application selectively impairs HNSCC cell lines through non-apoptotic mechanisms, while having a minimal effect on normal oral cavity epithelial cell lines.
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: Rafael
authors: R
authors: Guerrero-Preston
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: Takenori
authors: T
authors: Ogawa
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: Mamoru
authors: M
authors: Uemura
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: Gary
authors: G
authors: Shumulinsky
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: Blanca L
authors: BL
authors: Valle
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: Francesca
authors: F
authors: Pirini
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: Rajani
authors: R
authors: Ravi
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: David
authors: D
authors: Sidransky
authors: Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, The George Washington University, Washington, DC, USA.
authors: Michael
authors: M
authors: Keidar
authors: Department of Otolaryngology, Division of Head and Neck Cancer Research, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
authors: Barry
authors: B
authors: Trink
mesh_terms: D001272:Atmosphere; D015153:Blotting, Western; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D006258:Head and Neck Neoplasms / Q000473:pathology*; D006801:Humans; D058626:Plasma Gases / Q000494:pharmacology*; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D000077195:Squamous Cell Carcinoma of Head and Neck; D014410:Tumor Stem Cell Assay
chemical_list: D058626:Plasma Gases; D011065:Poly(ADP-ribose) Polymerases