title: Enhanced antitumor effect of ultrasound in the presence of piroxicam in a mouse air pouch model.
abstract: The antitumor effects of piroxicam, a non-steroidal anti-inflammatory drug, on sarcoma 180 cells under ultrasonic irradiation were examined in a mouse air pouch model. When piroxicam was added to sarcoma 180 suspension under ultrasound irradiation (2 MHz, 10 W, 120 s), the mortality rate of tumor cells immediately after the irradiation and the survival rate of mice were significantly higher than those when ultrasound alone was applied, and these effects of piroxicam were dose-dependent. When D-mannitol was used with piroxicam, the mortality rate of the tumors cells after the irradiation was comparable with that when piroxicam alone was applied, but when L-histidine was used concurrently, the antitumor effect was significantly lower than that when piroxicam alone was applied. Histological examinations one week after the ultrasound irradiation in the presence of piroxicam showed sparse tumor tissue in the air pouch and normal appearance of the air pouch and surrounding tissue. The findings suggest that piroxicam enhances the anti-tumor effects of ultrasound in vivo by increasing the production of singlet oxygen without damage to tissue surrounding the tumor.
authors.affiliation: Department of Orthopedic Surgery, Akita University School of Medicine, Akita 010-8543, Japan. cshokada@med.akita-u.ac.jp
authors.forename: Kyoji
authors.initials: K
authors.lastname: Okada
authors.forename: Eiji
authors.initials: E
authors.lastname: Itoi
authors.forename: Naohisa
authors.initials: N
authors.lastname: Miyakoshi
authors.forename: Mizuho
authors.initials: M
authors.lastname: Nakajima
authors.forename: Toshio
authors.initials: T
authors.lastname: Suzuki
authors.forename: Jun
authors.initials: J
authors.lastname: Nishida
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D003131:Combined Modality Therapy; D006415:Hematoporphyrins / Q000627:therapeutic use; D006639:Histidine / Q000494:pharmacology; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D010894:Piroxicam / Q000494:pharmacology*; D017382:Reactive Oxygen Species; D012510:Sarcoma 180 / Q000401:mortality / Q000473:pathology / Q000628:therapy*; D015996:Survival Rate; D014464:Ultrasonic Therapy
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D006415:Hematoporphyrins; D017382:Reactive Oxygen Species; D010894:Piroxicam; D006639:Histidine