title: Bactericidal effect of photodynamic therapy against methicillin-resistant Staphylococcus aureus strain with the use of various porphyrin photosensitizers.
abstract: Photodynamic therapy (PDT) is based on photosensitizers activated by light of appropriate wavelength. Their activation leads to generation of singlet oxygen and free radicals responsible for the cytotoxic effect. The aim of this project was to compare the bactericidal effect of PDT using different porphyrin photosensitizers against a methicillin-resistant Staphylococcus aureus strain. Exogenous sensitizers (protoporphyrin IX and newly synthesized derivative, protoporphyrin diarginate) induced a 3 log10-unit reduction in bacterial viable counts. With the use of endogenous, ALA-induced porphyrins, a 1.6 log10-unit reduction was obtained. The sensitizers tested executed their antibacterial activity with no essential change in the antibiotic resistance pattern of the studied strain.
authors.affiliation: Department of Biotechnology, Division of Molecular Diagnostics, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdańsk, Poland. grinholc@biotech.ug.gda.pl
authors.forename: Mariusz
authors.initials: M
authors.lastname: Grinholc
authors.forename: Bozena
authors.initials: B
authors.lastname: Szramka
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Olender
authors.forename: Alfreda
authors.initials: A
authors.lastname: Graczyk
mesh_terms: D008027:Light; D016106:Methicillin Resistance; D050296:Microbial Viability / Q000187:drug effects / Q000528:radiation effects; D010778:Photochemotherapy / Q000379:methods; D017319:Photosensitizing Agents / Q000737:chemistry / Q000494:pharmacology*; D011166:Porphyrins / Q000737:chemistry / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000528:radiation effects
chemical_list: D017319:Photosensitizing Agents; D011166:Porphyrins