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Effective photosensitization and selectivity in vivo of Candida Albicans by meso-tetra (N-methyl-4-pyridyl) porphine tetra tosylate.
- Source :
-
Lasers in surgery and medicine [Lasers Surg Med] 2011 Apr; Vol. 43 (4), pp. 324-32. - Publication Year :
- 2011
-
Abstract
- Background and Objective: The fungus Candida albicans commonly causes mucosal and cutaneous infections in patients with impaired immunity. We investigated the effectiveness of the photosensitizer meso-tetra (N-methyl-4-pyridyl) porphine tetra tosylate (TMP-1363) in the photodynamic treatment (PDT) of C. albicans infection in vitro and its selectivity in an animal model.<br />Materials and Methods: The efficacy of TMP-1363 in PDT of C. albicans in vitro was compared to that of methylene blue (MB) using a colony forming unit (CFU) assay. In vivo infection in the mouse was established by inoculation of C. albicans yeast in the intradermal space of the ear pinna. Two days post-infection, 0.3 mg ml(-1) TMP-1363 was administered topically. Thirty minutes after TMP-1363 application, the ears were irradiated at 514 nm using a fluence of 90 J cm(-2) delivered at an irradiance of 50 mW cm(-2) . The ears were excised 2 hours post-irradiation, homogenized, and the organism burden was determined by a CFU assay. In vivo wide field and confocal fluorescence imaging assessed the localization of the photosensitizer in relationship to C. albicans.<br />Results: Photosensitization with TMP-1363 resulted in a greater than three-log increase in killing of C. albicans in vitro compared to MB. In vivo fluorescence imaging demonstrated a high degree of selective labeling of C. albicans by TMP-1363. PDT of infection using TMP-1363 resulted in a significant reduction in CFU/ear relative to untreated controls. Infected ears subjected to PDT displayed complete healing over time with no observable damage to the pinna.<br />Conclusion: Our in vitro and in vivo findings support TMP-1363-mediated PDT as a viable therapeutic approach for the PDT of candidiasis.<br /> (Copyright © 2011 Wiley-Liss, Inc.)
- Subjects :
- Administration, Topical
Animals
Candida albicans metabolism
Colony Count, Microbial
Disease Models, Animal
Dose-Response Relationship, Drug
Female
Fluoroscopy
In Vitro Techniques
Methylene Blue administration & dosage
Methylene Blue pharmacology
Mice
Mice, Inbred BALB C
Photosensitivity Disorders
Random Allocation
Sensitivity and Specificity
Candida albicans drug effects
Candidiasis drug therapy
Photochemotherapy methods
Photosensitizing Agents pharmacology
Porphyrins pharmacology
Subjects
Details
- Language :
- English
- ISSN :
- 1096-9101
- Volume :
- 43
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Lasers in surgery and medicine
- Publication Type :
- Academic Journal
- Accession number :
- 21500227
- Full Text :
- https://doi.org/10.1002/lsm.21049