Phototargeting Oral Black-Pigmented Bacteria
| Autor: | Abraham D. Abernethy, Apostolos G. Doukas, Nikolaos S. Soukos, S. Som, J. Max Goodson, Chul Lee, Joshua Dunham, Karriann Ruggiero |
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| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Porphyrins
Light Microorganism Colony Count Microbial Dental Plaque Prevotella Dental plaque Prevotella intermedia Streptococcus constellatus Microbiology chemistry.chemical_compound Pigment Oral administration medicine Humans Pharmacology (medical) Periodontitis Prevotella melaninogenica Pharmacology biology Nucleic Acid Hybridization Pigments Biological Phototherapy biology.organism_classification medicine.disease Porphyrin Chronic periodontitis Infectious Diseases chemistry Susceptibility visual_art Chronic Disease visual_art.visual_art_medium Porphyromonas gingivalis Bacteria |
| Popis: | We have found that broadband light (380 to 520 nm) rapidly and selectively kills oral black-pigmented bacteria (BPB) in pure cultures and in dental plaque samples obtained from human subjects with chronic periodontitis. We hypothesize that this killing effect is a result of light excitation of their endogenous porphyrins. Cultures of Prevotella intermedia and P . nigrescens were killed by 4.2 J/cm 2 , whereas P . melaninogenica required 21 J/cm 2 . Exposure to light with a fluence of 42 J/cm 2 produced 99% killing of P. gingivalis . High-performance liquid chromatography demonstrated the presence of various amounts of different porphyrin molecules in BPB. The amounts of endogenous porphyrin in BPB were 267 ( P . intermedia ), 47 ( P . nigrescens ), 41 ( P . melaninogenica ), and 2.2 ( P . gingivalis ) ng/mg. Analysis of bacteria in dental plaque samples by DNA-DNA hybridization for 40 taxa before and after phototherapy showed that the growth of the four BPB was decreased by 2 and 3 times after irradiation at energy fluences of 4.2 and 21 J/cm 2 , respectively, whereas the growth of the remaining 36 microorganisms was decreased by 1.5 times at both energy fluences. The present study suggests that intraoral light exposure may be used to control BPB growth and possibly benefit patients with periodontal disease. |
| Databáze: | OpenAIRE |
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