Antimicrobial Photodynamic Therapy: Study of Bacterial Recovery Viability and Potential Development of Resistance after Treatment
Antimicrobial photodynamic therapy (aPDT) has emerged in the clinical field as a potential alternative to antibiotics to treat microbial infections. No cases of microbial viability recovery or any resistance mechanisms against it are yet known. 5,10,15-tris(1-Methylpyridinium-4-yl)-20-(pentafluoroph...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2010-01-01
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| Series: | Marine Drugs |
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| Online Access: | http://www.mdpi.com/1660-3397/8/1/91/ |
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| author | Eliana Alves Newton C. M. Gomes Ângela Cunha José A. S. Cavaleiro Augusto C. Tomé João P. C. Tomé Maria G. P. M. S. Neves Maria A. Faustino Carla M. B. Carvalho Anabela Tavares Adelaide Almeida |
| author_facet | Eliana Alves Newton C. M. Gomes Ângela Cunha José A. S. Cavaleiro Augusto C. Tomé João P. C. Tomé Maria G. P. M. S. Neves Maria A. Faustino Carla M. B. Carvalho Anabela Tavares Adelaide Almeida |
| author_sort | Eliana Alves |
| collection | DOAJ |
| description | Antimicrobial photodynamic therapy (aPDT) has emerged in the clinical field as a potential alternative to antibiotics to treat microbial infections. No cases of microbial viability recovery or any resistance mechanisms against it are yet known. 5,10,15-tris(1-Methylpyridinium-4-yl)-20-(pentafluorophenyl)-porphyrin triiodide (Tri-Py+-Me-PF) was used as photosensitizer. Vibrio fischeri and recombinant Escherichia coli were the studied bacteria. To determine the bacterial recovery after treatment, Tri-Py+-Me-PF (5.0 µM) was added to bacterial suspensions and the samples were irradiated with white light (40 W m-2) for 270 minutes. Then, the samples were protected from light, aliquots collected at different intervals and the bioluminescence measured. To assess the development of resistance after treatment, bacterial suspensions were exposed to white light (25 minutes), in presence of 5.0 μM of Tri-Py+-Me-PF (99.99% of inactivation) and plated. After the first irradiation period, surviving colonies were collected from the plate and resuspended in PBS. Then, an identical protocol was used and repeated ten times for each bacterium. The results suggest that aPDT using Tri-Py+-Me-PF represents a promising approach to efficiently destroy bacteria since after a single treatment these microorganisms do not recover their viability and after ten generations of partially photosensitized cells neither of the bacteria develop resistance to the photodynamic process. |
| first_indexed | 2024-04-13T00:33:28Z |
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| institution | Directory Open Access Journal |
| issn | 1660-3397 |
| language | English |
| last_indexed | 2024-04-13T00:33:28Z |
| publishDate | 2010-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Marine Drugs |
| spelling | doaj.art-73ca39f3b5724d48987e7ef30901457c2022-12-22T03:10:24ZengMDPI AGMarine Drugs1660-33972010-01-01819110510.3390/md8010091Antimicrobial Photodynamic Therapy: Study of Bacterial Recovery Viability and Potential Development of Resistance after TreatmentEliana AlvesNewton C. M. GomesÂngela CunhaJosé A. S. CavaleiroAugusto C. ToméJoão P. C. ToméMaria G. P. M. S. NevesMaria A. FaustinoCarla M. B. CarvalhoAnabela TavaresAdelaide AlmeidaAntimicrobial photodynamic therapy (aPDT) has emerged in the clinical field as a potential alternative to antibiotics to treat microbial infections. No cases of microbial viability recovery or any resistance mechanisms against it are yet known. 5,10,15-tris(1-Methylpyridinium-4-yl)-20-(pentafluorophenyl)-porphyrin triiodide (Tri-Py+-Me-PF) was used as photosensitizer. Vibrio fischeri and recombinant Escherichia coli were the studied bacteria. To determine the bacterial recovery after treatment, Tri-Py+-Me-PF (5.0 µM) was added to bacterial suspensions and the samples were irradiated with white light (40 W m-2) for 270 minutes. Then, the samples were protected from light, aliquots collected at different intervals and the bioluminescence measured. To assess the development of resistance after treatment, bacterial suspensions were exposed to white light (25 minutes), in presence of 5.0 μM of Tri-Py+-Me-PF (99.99% of inactivation) and plated. After the first irradiation period, surviving colonies were collected from the plate and resuspended in PBS. Then, an identical protocol was used and repeated ten times for each bacterium. The results suggest that aPDT using Tri-Py+-Me-PF represents a promising approach to efficiently destroy bacteria since after a single treatment these microorganisms do not recover their viability and after ten generations of partially photosensitized cells neither of the bacteria develop resistance to the photodynamic process.http://www.mdpi.com/1660-3397/8/1/91/cationic porphyrinantimicrobial photodynamic therapybacterial resistancebacterial viabilitybioluminescence |
| spellingShingle | Eliana Alves Newton C. M. Gomes Ângela Cunha José A. S. Cavaleiro Augusto C. Tomé João P. C. Tomé Maria G. P. M. S. Neves Maria A. Faustino Carla M. B. Carvalho Anabela Tavares Adelaide Almeida Antimicrobial Photodynamic Therapy: Study of Bacterial Recovery Viability and Potential Development of Resistance after Treatment Marine Drugs cationic porphyrin antimicrobial photodynamic therapy bacterial resistance bacterial viability bioluminescence |
| title | Antimicrobial Photodynamic Therapy: Study of Bacterial Recovery Viability and Potential Development of Resistance after Treatment |
| title_full | Antimicrobial Photodynamic Therapy: Study of Bacterial Recovery Viability and Potential Development of Resistance after Treatment |
| title_fullStr | Antimicrobial Photodynamic Therapy: Study of Bacterial Recovery Viability and Potential Development of Resistance after Treatment |
| title_full_unstemmed | Antimicrobial Photodynamic Therapy: Study of Bacterial Recovery Viability and Potential Development of Resistance after Treatment |
| title_short | Antimicrobial Photodynamic Therapy: Study of Bacterial Recovery Viability and Potential Development of Resistance after Treatment |
| title_sort | antimicrobial photodynamic therapy study of bacterial recovery viability and potential development of resistance after treatment |
| topic | cationic porphyrin antimicrobial photodynamic therapy bacterial resistance bacterial viability bioluminescence |
| url | http://www.mdpi.com/1660-3397/8/1/91/ |
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