Intraperitoneal Administration of Plasma-Activated Medium: Proposal of a Novel Treatment Option for Peritoneal Metastasis From Gastric Cancer.

Abstract

BACKGROUND:

The administration of fluid irradiated with non-equilibrium atmospheric pressure plasma (NEAPP) has attracted much interest as a novel therapeutic method for cancer. The authors previously reported on the efficacy of plasma-activated medium (PAM) for treating cancer cell lines through the induction of apoptosis. In this study, the therapeutic effect of PAM was evaluated in vivo using a peritoneal metastasis mouse model.

METHODS:

Two gastric cancer cell lines were used in proliferation assays performed to optimize the production of PAM by changing the distance between the plasma source and the medium surface and by altering the volume of irradiated medium. Wound-healing and adhesion assays were conducted to determine the effect of PAM therapy on cell migration and adhesion capacity in vitro. Finally, a mouse model established by the intraperitoneal injection of enhanced green fluorescent protein-tagged gastric cancer cells was used to explore the efficacy of PAM administered intraperitoneally in inhibiting peritoneal metastasis formation.

RESULTS:

Shorter distances between the plasma source and the medium surface and smaller volumes of treated medium increased the anti-tumor effect of PAM. The PAM treatment attenuated gastric cancer cell migration and adhesion in vitro. The intraperitoneal administration of PAM decreased the formation of peritoneal metastatic nodules by 60% in the mouse model, and no adverse events were observed.

CONCLUSIONS:

Plasma-activated liquids may represent a novel therapeutic method for the treatment of peritoneal metastases in gastric cancer.

• Authors: Shigeomi Takeda, Suguru Yamada, Norifumi Hattori, Kae Nakamura, Hiromasa Tanaka, Hiroaki Kajiyama, Mitsuro Kanda, Daisuke Kobayashi, Chie Tanaka, Tsutomu Fujii, Michitaka Fujiwara, Masaaki Mizuno, Masaru Hori, Yasuhiro Kodera
• Journal: Annals of surgical oncology (Ann Surg Oncol) Vol. 24 Issue 5 Pg. 1188-1194 (May 2017) ISSN: 1534-4681 [Electronic] United States
• PMID: 28058557 (Publication Type: Journal Article)

Chemical References

• Culture Media
• Plasma Gases

Topics

• Animals
• Cell Adhesion
• Cell Line, Tumor
• Cell Movement
• Cell Proliferation
• Culture Media
• Disease Models, Animal
• Infusions, Parenteral
• Male
• Mice
• Mice, Inbred BALB C
• Peritoneal Neoplasms (secondary, therapy)
• Plasma Gases
• Stomach Neoplasms (pathology)
• Wound Healing
• Xenograft Model Antitumor Assays