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Recently, the development of antimicrobial photodynamic therapy (aPDT) has been a necessary antimicrobial strategy against antibiotic resistance. Among the wide variety of bacteria found in the oral flora, <jats:italic>Porphyromonas gingivalis<\/jats:italic> (<jats:italic>P<\/jats:italic>. <jats:italic>gingivalis<\/jats:italic>) is one of the etiological agents of periodontal disease. aPDT has been studied for periodontal disease, but has risks of cytotoxicity to normal stained tissue. In this study, we performed aPDT using protoporphyrin IX (PpIX), an intracellular pigment of <jats:italic>P<\/jats:italic>. <jats:italic>gingivalis<\/jats:italic>, without an external photosensitizer. We confirmed singlet oxygen generation by PpIX in a blue-light irradiation intensity-dependent manner. We discovered that blue-light irradiation on <jats:italic>P<\/jats:italic>. <jats:italic>gingivalis<\/jats:italic> is potentially bactericidal. The sterilization mechanism seems to be oxidative DNA damage in bacterial cells. Although it is said that no resistant bacteria will emerge using aPDT, the conventional method relies on an added photosensitizer dye. PpIX in <jats:italic>P<\/jats:italic>. <jats:italic>gingivalis<\/jats:italic> is used in energy production, so aPDT applied to PpIX of <jats:italic>P<\/jats:italic>. <jats:italic>gingivalis<\/jats:italic> should limit the appearance of resistant bacteria. This approach not only has potential as an effective treatment for new periodontal diseases, but also offers potential antibacterial treatment for multiple drug resistant bacteria.<\/jats:p>","DOI":"10.1038\/s41598-017-05706-1","type":"journal-article","created":{"date-parts":[[2017,7,6]],"date-time":"2017-07-06T11:56:17Z","timestamp":1499342177000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":75,"title":["Antimicrobial effect of blue light using Porphyromonas gingivalis pigment"],"prefix":"10.1038","volume":"7","author":[{"given":"Ayaka","family":"Yoshida","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haruka","family":"Sasaki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Toshizo","family":"Toyama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mitsunori","family":"Araki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Fujioka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koichi","family":"Tsukiyama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nobushiro","family":"Hamada","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fumihiko","family":"Yoshino","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2017,7,12]]},"reference":[{"key":"5706_CR1","first-page":"235","volume":"34","author":"RC Page","year":"1976","unstructured":"Page, R. 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