title: Bactericidal effects of photoradiation therapy with hematoporphyrin derivative.
abstract: Hematoporphyrin derivative (Hpd) localizes selectively in malignant and rapidly metabolizing tissues and undergoes a cytotoxic reaction when exposed to light of a specific wavelength. Hpd has been studied extensively with regard to the diagnosis and treatment of tumors but not with regard to bactericidal activity. This investigation assessed the effect of light-activated Hpd on various microorganisms, on human polymorphonuclear leukocytes, and on the interactions of polymorphonuclear leukocytes and bacteria. Light-activated Hpd was 99.9% bactericidal against Staphylococcus aureus, Streptococcus faecalis, Bacteroides fragilis, Streptococcus M-G intermedius, Streptococcus mutans, Peptostreptococcus anaerobius, Peptococcus magnus, and Clostridium perfringens, but did not affect Escherichia coli, Pseudomonas aeruginosa, or Candida albicans. Photoactivation of Hpd rendered 98% of polymorphonuclear leukocytes inviable. Combinations of light-activated Hpd and polymorphonuclear leukocytes had a 4-log (99.99%) bactericidal effect on both intra- and extracellular S. aureus. The ability of Hpd to localize in inflammatory tissues may have therapeutic applications in the treatment of abscesses.
authors.forename: F R
authors.initials: FR
authors.lastname: Venezio
authors.forename: C
authors.initials: C
authors.lastname: DiVincenzo
authors.forename: R
authors.initials: R
authors.lastname: Sherman
authors.forename: M
authors.initials: M
authors.lastname: Reichman
authors.forename: T C
authors.initials: TC
authors.lastname: Origitano
authors.forename: K
authors.initials: K
authors.lastname: Thompson
authors.forename: O H
authors.initials: OH
authors.lastname: Reichman
mesh_terms: D001419:Bacteria / Q000187:drug effects; D001770:Blood Bactericidal Activity / Q000187:drug effects; D017324:Hematoporphyrin Derivative; D006415:Hematoporphyrins / Q000494:pharmacology*; D008027:Light; D009504:Neutrophils / Q000187:drug effects*; D011838:Radiation-Sensitizing Agents / Q000008:administration & dosage*
chemical_list: D006415:Hematoporphyrins; D011838:Radiation-Sensitizing Agents; D017324:Hematoporphyrin Derivative