01 October 2005
Lack of effect of hyperoxia on photodynamic therapy and lipid peroxidation in three different cancer cell lines
Astrid Hjelde, Odrun A. Gederaas, Hans E. Krokan, Alf O. BrubakkMed Sci Monit 2005; 11(10): BR351-356 :: ID: 430288
Abstract
Background:The use of photodynamic therapy (PDT) to treat malignant tumors involves a photosensitizing drug, light, and oxygen. Since PDT requires oxygen, the purpose of this study was to investigate whether increased oxygen tension increases cell death compared with normoxic conditions (21 kPa oxygen).Material/Methods:The effect of hyperoxia on PDT and lipid peroxidation was investigated in two human colon carcinoma cell lines, SW480 and WiDr, and one rat bladder cell carcinoma, AY-27. The cells were incubated with 2 mM 5-aminolaevulinic acid (5-ALA) for 3.5 h at 37°C. This treatment induces the accumulation of protoporphyrin IX (PpIX), which is a potent photosensitizer. PpIX absorbs light energy and produces singlet oxygen in the presence of molecular oxygen, which then destroys the cancer cells. The cells were illuminated (0.5–30 min) at room temperature by blue light (435 nm) prior to hyperoxia exposure. This treatment was performed in a small, temperature-controlled (37°C) hyperbaric chamber using oxygen at a pressure of 100, 200, 300, or 400 kPa.Results:PDT performed under normoxia induced lipid peroxidation and caused a considerable decrease in cell survival. However, this decrease was not influenced by the presence of hyperoxia (P>0.05). Furthermore, hyperoxic exposure (400 kPa O[sub]2[/sub]) alone caused no increase in lipid peroxidation compared with untreated control cells.
Keywords: Aminolevulinic Acid - administration & dosage, Colonic Neoplasms - pathology, Hyperoxia - metabolism, Lipid Peroxidation, Photochemotherapy, Photosensitizing Agents - administration & dosage, Protoporphyrins - administration & dosage, Urinary Bladder Neoplasms - pathology
Editorial
01 March 2024 : Editorial
Editorial: First Regulatory Approvals for CRISPR-Cas9 Therapeutic Gene Editing for Sickle Cell Disease and Transfusion-Dependent β-ThalassemiaDOI: 10.12659/MSM.944204
Med Sci Monit 2024; 30:e944204
In Press
18 Mar 2024 : Clinical Research
Sexual Dysfunction in Women After Tibial Fracture: A Retrospective Comparative StudyMed Sci Monit In Press; DOI: 10.12659/MSM.944136
21 Feb 2024 : Clinical Research
Potential Value of HSP90α in Prognosis of Triple-Negative Breast CancerMed Sci Monit In Press; DOI: 10.12659/MSM.943049
22 Feb 2024 : Review article
Differentiation of Native Vertebral Osteomyelitis: A Comprehensive Review of Imaging Techniques and Future ...Med Sci Monit In Press; DOI: 10.12659/MSM.943168
23 Feb 2024 : Clinical Research
A Study of 60 Patients with Low Back Pain to Compare Outcomes Following Magnetotherapy, Ultrasound, Laser, ...Med Sci Monit In Press; DOI: 10.12659/MSM.943732
Most Viewed Current Articles
16 May 2023 : Clinical Research
Electrophysiological Testing for an Auditory Processing Disorder and Reading Performance in 54 School Stude...DOI :10.12659/MSM.940387
Med Sci Monit 2023; 29:e940387
17 Jan 2024 : Review article
Vaccination Guidelines for Pregnant Women: Addressing COVID-19 and the Omicron VariantDOI :10.12659/MSM.942799
Med Sci Monit 2024; 30:e942799
14 Dec 2022 : Clinical Research
Prevalence and Variability of Allergen-Specific Immunoglobulin E in Patients with Elevated Tryptase LevelsDOI :10.12659/MSM.937990
Med Sci Monit 2022; 28:e937990
01 Jan 2022 : Editorial
Editorial: Current Status of Oral Antiviral Drug Treatments for SARS-CoV-2 Infection in Non-Hospitalized Pa...DOI :10.12659/MSM.935952
Med Sci Monit 2022; 28:e935952