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Photofrin as a radiosensitizer in an in vitro cell survival assay.

Abstract
Chemical modifiers (radiosensitizers) are used in order to increase the efficacy of radiotherapy. The use of Photodynamic Therapy for tumor treatment, especially with Photofrin II, is also known. At present, no chemical modifier has been found to act as a selective radiosensitizer. Experiments using several series of cell lines were performed; human bladder cancer cell line (RT4), colon adenocarcinoma cells (HT-29), and the glioblastoma cells (U-373 MG) were investigated, with and without incubation with Photofrin II, before irradiation. The irradiation was performed using doses ranging from 0 to 8Gy. Colony forming tests were applied to determine the efficiency of Photofrin II as a radiation sensitizer in comparison to irradiation alone. Two of the cell lines tested, cultures of the RT4 and U-373 MG, treated with Photofrin II prior to radiation, showed cell survival lower than cultures untreated with Photofrin II but irradiated under identical conditions. For the HT-29 cells, the results did not differ between the two groups (with and without Photofrin). The results of this study showed that Photofrin II can act, under certain conditions as a tumor radiosensitizer.
AuthorsUlrike Kulka, Moshe Schaffer, Axel Siefert, Pamela M Schaffer, Astrid Olsner, Kawser Kasseb, Alfons Hofstetter, Eckhart Dühmke, Giulio Jori
JournalBiochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 311 Issue 1 Pg. 98-103 (Nov 07 2003) ISSN: 0006-291X [Print] United States
PMID14575700 (Publication Type: Comparative Study, Journal Article)
Chemical References
  • Radiation-Sensitizing Agents
  • Dihematoporphyrin Ether
Topics
  • Adenocarcinoma (drug therapy, pathology, physiopathology)
  • Cell Line, Tumor (drug effects, radiation effects)
  • Cell Survival (drug effects, radiation effects)
  • Dihematoporphyrin Ether (pharmacology, therapeutic use)
  • Dose-Response Relationship, Drug
  • Dose-Response Relationship, Radiation
  • Glioblastoma (drug therapy, pathology, physiopathology)
  • Humans
  • Photochemotherapy (methods)
  • Radiation Tolerance (drug effects)
  • Radiation-Sensitizing Agents (pharmacology, therapeutic use)
  • Urinary Bladder Neoplasms (drug therapy, pathology, physiopathology)

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