title: In vitro study of reactive oxygen species production during photodynamic therapy in ultrasound-pretreated cancer cells.
abstract: Several recent studies bring evidence of cell death enhancement in photodynamic compound loaded cells by ultrasonic treatment. There are a number of hypotheses suggesting the mechanism of the harmful ultrasonic effect. One of them considers a process in the activation of photosensitizers by ultrasonic energy. Because the basis of the photodynamic damaging effect on cells consists in the production of reactive oxygen species (ROS), we focused our study on whether the ultrasound can increase ROS production within cancer cells. Particularly, we studied ROS formation in ultrasound pretreated breast adenocarcinoma cells during photodynamic therapy in the presence of chloroaluminum phthalocyanine disulfonate (ClAlPcS2). Production of ROS was investigated by the molecular probe CM-H2DCFDA. Our results show that ClAlPcS2 induces higher ROS production in the ultrasound pretreated cell lines at a concentration of 100 microM and light intensity of 2 mW/cm2. We also observed a dependence of ROS production on photosensitizer concentration and light dose. These results demonstrate that the photodynamic effect on breast cancer cells can be enhanced by ultrasound pretreatment.
authors.affiliation: Department of Medical Biophysics, Faculty of Medicine, Palacký University, Olomouc, Czech Republic. kol@tunw.upol.cz
authors.forename: H
authors.initials: H
authors.lastname: Kolárová
authors.forename: R
authors.initials: R
authors.lastname: Bajgar
authors.forename: K
authors.initials: K
authors.lastname: Tománková
authors.forename: E
authors.initials: E
authors.lastname: Krestýn
authors.forename: L
authors.initials: L
authors.lastname: Dolezal
authors.forename: J
authors.initials: J
authors.lastname: Hálek
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D045744:Cell Line, Tumor; D048430:Cell Shape / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D009942:Organometallic Compounds / Q000494:pharmacology / Q000627:therapeutic use*; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000494:pharmacology / Q000627:therapeutic use*; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013997:Time Factors; D014464:Ultrasonic Therapy
chemical_list: D009942:Organometallic Compounds; D017319:Photosensitizing Agents; D017382:Reactive Oxygen Species; C439084:chloroaluminum disulfonated phthalocyanine